Stefanie Wachter's research while affiliated with Max Planck Institute for Astronomy and other places
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Publications (216)
This paper presents the specification, design, and development of the Visible Camera (VIS) on the ESA Euclid mission. VIS is a large optical-band imager with a field of view of 0.54 deg^2 sampled at 0.1" with an array of 609 Megapixels and spatial resolution of 0.18". It will be used to survey approximately 14,000 deg^2 of extragalactic sky to meas...
The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown. Euclid is a medium-class mission in the Cosmic Vision 2015-2025 programme of the European Space Agency (ESA) that will provide high-resolution optical imaging, as well as nea...
The near-infrared calibration unit (NI-CU) onboard Euclid's Near-Infrared Spectrometer and Photometer (NISP) is the first astronomical calibration lamp based on light-emitting diodes (LEDs) to be operated in space. Euclid is a mission in ESA's 'Cosmic Vision 2015-2025' framework, to explore the dark universe and provide a next-level characterisatio...
The Near-Infrared Spectrometer and Photometer (NISP) on board the Euclid satellite provides multiband photometry and R>=450 slitless grism spectroscopy in the 950-2020nm wavelength range. In this reference article we illuminate the background of NISP's functional and calibration requirements, describe the instrument's integral components, and provi...
Euclid is a mission of the European Space Agency that is designed to constrain the properties of dark energy and gravity via weak gravitational lensing and galaxy clustering. It will carry out a wide area imaging and spectroscopy survey (the Euclid Wide Survey: EWS) in visible and near-infrared bands, covering approximately 15 000 deg2 of extragala...
Euclid will be the first space mission to survey most of the extragalactic sky in the 0.95–2.02 µm range, to a 5 σ point-source median depth of 24.4 AB mag. This unique photometric dataset will find wide use beyond Euclid’s core science. In this paper, we present accurate computations of the Euclid YE, JE, and HE passbands used by the Near-Infrared...
Euclid will be the first space mission to survey most of the extragalactic sky in the 0.95–2.02 µm range, to a 5 σ point-source median depth of 24.4 AB mag. This unique photometric dataset will find wide use beyond Euclid’s core science. In this paper, we present accurate computations of the Euclid YE, JE, and HE passbands used by the Near-Infrared...
Euclid will be the first space mission to survey most of the extragalactic sky in the 0.95-2.02 $\mu$m range, to a 5$\sigma$ point-source median depth of 24.4 AB mag. This unique photometric data set will find wide use beyond Euclid's core science. In this paper, we present accurate computations of the Euclid Y_E, J_E and H_E passbands used by the...
Euclid is an ESA mission designed to constrain the properties of dark energy and gravity via weak gravitational lensing and galaxy clustering. It will carry out a wide area imaging and spectroscopy survey (EWS) in visible and near-infrared, covering roughly 15,000 square degrees of extragalactic sky on six years. The wide-field telescope and instru...
We propose an extension of the LSST survey to cover the northern sky to DEC < +30 (accessible at airmass <1.8). This survey will increase the LSST sky coverage by ~9,600 square degrees from 18,900 to 28,500 square degrees (a 50% increase) but use only 0.6-2.5% of the time depending on the synergies with other surveys. This increased area addresses...
This white paper is the result of the Tri-Agency Working Group (TAG) appointed to develop synergies between missions and is intended to clarify what LSST observations are needed in order to maximally enhance the combined science output of LSST and Euclid. To facilitate LSST planning we provide a range of possible LSST surveys with clear metrics bas...
This white paper is the result of the Tri-Agency Working Group (TAG) appointed to develop synergies between missions and is intended to clarify what LSST observations are needed in order to maximally enhance the combined science output of LSST and Euclid. To facilitate LSST planning we provide a range of possible LSST surveys with clear metrics bas...
We propose an extension of the LSST survey to cover the northern sky to DEC < +30 (accessible at airmass <1.8). This survey will increase the LSST sky coverage by ~9,600 square degrees from 18,900 to 28,500 square degrees (a 50% increase) but use only 0.6-2.5% of the time depending on the synergies with other surveys. This increased area addresses...
Euclid is an ESA survey mission designed to understand the origin of the Universe's accelerating expansion using weak gravitational lensing and redshift clustering as main probes. Very high image quality is required for galaxy shape measurements, while accurate photometry at visible and near-infrared wavelengths and near-infrared spectroscopy are n...
ESA's Dark Energy Mission Euclid will map the 3D matter distribution in our Universe using two Dark Energy probes: Weak Lensing (WL) and Galaxy Clustering (GC). The extreme accuracy required for both probes can only be achieved by observing from space in order to limit all observational biases in the measurements of the tracer galaxies. Weak Lensin...
We consider the application of relative self-calibration using overlap regions to spectroscopic galaxy surveys based on slit-less spectroscopy. This method is based on that developed for the SDSS by Padmanabhan at al. (2008). We separate the calibration of the pixel-to-pixel (intra-detector, small-scale) flat field from the detector-to-detector (in...
The Euclid space mission proposes to survey 15000 square degrees of the
extragalactic sky during 6 years, with a step-and-stare technique. The
scheduling of observation sequences is driven by the primary scientific
objectives, spacecraft constraints, calibration requirements and physical
properties of the sky. We present the current reference imple...
Euclid is the next ESA mission devoted to cosmology. It aims at observing
most of the extragalactic sky, studying both gravitational lensing and
clustering over $\sim$15,000 square degrees. The mission is expected to be
launched in year 2020 and to last six years. The sheer amount of data of
different kinds, the variety of (un)known systematic effe...
The Euclid mission objective is to understand why the expansion of the Universe is accelerating by mapping the geometry of the dark Universe by investigating the distance-redshift relationship and tracing the evolution of cosmic structures. The Euclid project is part of ESA's Cosmic Vision program with its launch planned for 2020. The NISP (Near In...
In June 2012, Euclid, ESA's Cosmology mission was approved for implementation. Afterwards the industrial contracts were signed for the payload module and the spacecraft prime, and the mission requirements consolidated. We present the status of the mission in the light of the design solutions adopted by the contractors. The performances of the space...
Novalike cataclysmic variables have persistently high mass transfer rates and
prominent steady state accretion disks. We present an analysis of infrared
observations of twelve novalikes obtained from the Two Micron All Sky Survey,
the Spitzer Space Telescope, and the Wide-field Infrared Survey Explorer All
Sky Survey. The presence of an infrared ex...
We have compiled photometric data from the Wide-field Infrared Survey
Explorer All Sky Survey and other archival sources for the more than 2200
objects in the original McCook & Sion Catalog of Spectroscopically Identified
White Dwarfs. We applied color-selection criteria to identify 28 targets whose
infrared spectral energy distributions depart fro...
The WISE Infra-Red Excesses around Degenerates (WIRED) Survey combines
WISE photometry of white dwarfs with optical and NIR photometry to
carefully search for infrared excesses due to dust and substellar
companions in an effort to create a statistical sample of both classes
of objects. To date, WIRED has discovered dozens of candidates. In this
tal...
ORIGIN is a proposal for the M3 mission call of ESA aimed at the study of metal creation from the epoch of cosmic dawn. Using
high-spectral resolution in the soft X-ray band, ORIGIN will be able to identify the physical conditions of all abundant elements
between C and Ni to red-shifts of z = 10, and beyond. The mission will answer questions such a...
ORIGIN is a proposal for the M3 mission call of ESA aimed at the study of metal creation from the epoch of cosmic dawn. Using high-spectral resolution in the soft X-ray band, ORIGIN will be able to identify the physical conditions of all abundant elements between C and Ni to red-shifts of z = 10, and beyond. The mission will answer questions such a...
We present the discovery with WISE of a significant infrared excess associated with the eclipsing post-common envelope binary SDSS J030308.35+005443.7, the first excess discovered around a non-interacting white dwarf+main-sequence M dwarf binary. The spectral energy distribution of the white dwarf+M dwarf companion shows significant excess longward...
We report on the analysis of two XMM-Newton observations of the recently discovered soft gamma repeater Swift J1834.9–0846, taken in 2005 September and one month after the source went into outburst on 2011 August 7. We performed timing and spectral analyses on the point source as well as on the extended emission. We find that the source period is c...
We present X-ray observations of the new transient magnetar Swift J1834.9–0846, discovered with the Swift Burst Alert Telescope on 2011 August 7. The data were obtained with Swift, Rossi X-ray Timing Explorer (RXTE), CXO, and XMM-Newton both before and after the outburst. Timing analysis reveals single peak pulsations with a period of 2.4823 s and...
The Wide-field Infrared Survey Explorer (WISE; Wright et al. 2010)
surveyed the entire sky at 3.4, 4.6, 12 and 22 microns in 2010,
achieving 5-sigma point source sensitivities per band better than 0.08,
0.11, 1 and 6 mJy in unconfused regions on the ecliptic. The WISE
All-Sky Data Release, conducted on March 14, 2012, incorporates all data
taken du...
We have performed detailed temporal and time-integrated spectral analysis of
286 bursts from SGR J1550-5418 detected with the Fermi Gamma-ray Burst Monitor
(GBM) in January 2009, resulting in the largest uniform sample of temporal and
spectral properties of SGR J1550-5418 bursts. We have used the combination of
broadband and high time-resolution da...
We present X-ray observations of the new transient magnetar Swift
J1834.9-0846, discovered with Swift BAT on 2011 August 7. The data were
obtained with Swift, RXTE, CXO, and XMM-Newton both before and after the
outburst. Timing analysis reveals singe peak pulsations with a period of 2.4823
s and an unusually high pulsed fraction, 85+/-10%. Using th...
The Wide-field Infrared Survey Explorer (WISE) is a NASA medium class
Explorer mission that was launched on 2009 December 14. WISE mapped the
entire sky simultaneously in four infrared (IR) bands centered at 3.4,
4.6, 12, and 22um (denoted W1, W2, W3, and W4, respectively). The WISE
InfraRed Excesses around Degenerates (WIRED) Survey is designed to...
With the launch of the {\em Wide-field Infrared Survey Explorer} ({\em
WISE}), a new era of detecting planetary debris and brown dwarfs around white
dwarfs (WDs) has begun with the {\em WISE} InfraRed Excesses around Degenerates
(WIRED) Survey. The WIRED Survey is sensitive to substellar objects and dusty
debris around WDs out to distances exceedin...
We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the gamma-ray burst monitor on board the Fermi
Gamma-ray Space Telescope during 13 days of the source's activation in 2008 (August 22- September 3). We find that the T
90 durations of the bursts can be fit with a log-normal distribution with a mean value...
GX17+2 is a low-mass X-ray binary (LMXB) that is also a member of a small family of LMXBs known as "Z-sources" that are believed to have persistent X-ray luminosities that are very close to the Eddington limit. GX17+2 is highly variable at both radio and X-ray frequencies, a feature common to Z-sources. What sets GX17+2 apart is its dramatic variab...
We propose a uniform survey of 37 nearby pulsars in order to determine the overall frequency of debris disks around neutron stars. Debris disks around neutron stars are invoked in the formation mechanism of the planets around the pulsar PSR 1257+12 and to explain the intermittent cessation of pulsations for a substantial number of radio pulsars. Fu...
ORIGIN is a proposal for the M3 mission call of ESA aimed at the study of
metal creation from the epoch of cosmic dawn. Using high-spectral resolution in
the soft X-ray band, ORIGIN will be able to identify the physical conditions of
all abundant elements between C and Ni to red-shifts of z=10, and beyond. The
mission will answer questions such as:...
The Wide-field Infrared Survey Explorer (WISE; Wright et al. 2010)
surveyed the entire sky at 3.4, 4.6, 12 and 22 microns in 2010,
achieving 5-sigma point source sensitivities per band better than 0.08,
0.11, 1 and 6 mJy in unconfused regions on the ecliptic. The WISE
Preliminary Data Release, conducted on April 14, 2011, incorporates data
covering...
We present the results of a deep, wide-field CCD survey for the open cluster NGC 3532. Our new BV(RI)c
photometry effectively covers a one square degree area and reaches an unprecedented depth of V ~ 21 to reveal that NGC 3532 is a rich open cluster that harbors a large number of faint, low-mass stars. We employ a number of methods to reduce the im...
We report on our ongoing efforts to characterize the luminous central stars of circumstellar shell sources discovered with the Spitzer Space Telescope. The objects in our selection are highly symmetric, circular and elliptical shells, most prominent at 24mum, and the vast majority of the shells and central sources has never been studied previously....
The WISE IR Excesses around Degenerates (WIRED) Survey is designed to find low mass companions and dusty disks around white dwarfs using NASA's Wide-field Infared Survey Explorer (WISE) mission. WISE has finished scanning the entire sky, and we have currently cross-correlated the SDSS DR7 white dwarf catalogue with 2MASS, UKIDSS, and WISE photometr...
Massive stars play a key role in the chemical and mechanical evolution of the ISM in galaxies. These luminous stars with their strong winds and mass outflows are the dominating influence on their environment in terms of energetics and chemical modification of the ISM. Despite their importance, our knowledge about their formation and evolution is su...
With the launch of the Wide-Field Infrared Survey Explorer (WISE), a new era of detecting planetary debris around white dwarfs (WDs) has begun with the WISE InfraRed Excesses around Degenerates (WIRED) Survey. The WIRED survey will be sensitive to substellar objects and dusty debris around WDs out to distances exceeding 100 pc, well beyond the comp...
The WISE IR Excesses around Degenerates (WIRED) Survey is designed to find low mass companions and dusty disks around white dwarfs using NASA’s Wide‐field Infared Survey Explorer (WISE) mission. WISE has finished scanning the entire sky, and we have currently cross‐correlated the SDSS DR4 white dwarf catalogue with 2MASS, UKIDSS, and WISE
photomet...
We report the discovery of a pair of infrared, axisymmetric rings in the planetary nebula NGC 1514 during the
course of the WISE all-sky mid-infrared survey. Similar structures are seen at visible wavelengths in objects such as
the “Engraved Hourglass Nebula” (MyCn 18) and the “Southern Crab Nebula” (Hen 2-104). However, in NGC 1514
we see only a s...
From IRS Staring observations in the Spitzer archive we selected those stellar targets that had been observed with all the low-resolution IRS modules. We did not include known young stars with circumstellar material, stars known to harbor debris disks, or objects classified in SIMBAD as RS CVn, Be stars, or eclipsing binaries. We have also avoided...
We present Spitzer Space Telescope spectra of 147 stars (R~64 - 128, lambdalambda = 5 - 35 mum, S/N~100) covering most spectral and luminosity classes within the HR diagram. The spectra are available from the NASA/IPAC Infrared Science Archive (IRSA) and from the first author's webpage (http://web.ipac.caltech.edu/staff/ardila/Atlas/). The Atlas co...
The Wide-field Infrared Survey Explorer (WISE) is a NASA medium class Explorer
mission that performed an all sky survey in four infrared bands. We present an overview of the WISE
InfraRed Excesses around Degenerates (WIRED) Survey, which has the goals of characterizing
white dwarf stars in the WISE bands, confirming objects known to have infrared e...
We present the Spitzer Atlas of Stellar Spectra (SASS), which includes 159 stellar spectra (5 to 32 mic; R~100) taken with the Infrared Spectrograph on the Spitzer Space Telescope. This Atlas gathers representative spectra of a broad section of the Hertzsprung-Russell diagram, intended to serve as a general stellar spectral reference in the mid-inf...
We have spectroscopically discovered a pair of twin, nitrogen-type, hydrogen-rich, Wolf-Rayet stars (WN8–9h)
that are both surrounded by circular, mid-infrared-bright nebulae detected with the Spitzer Space Telescope and
MIPS instrument. The emission is probably dominated by a thermal continuum from cool dust, but also may contain
contributions fro...
Results are presented for a Hubble Space Telescope Advanced Camera for
Surveys high-resolution imaging campaign of 90 white dwarfs with known or
suspected low mass stellar and substellar companions. Of the 72 targets which
remain candidate and confirmed white dwarfs with near-infrared excess, 43 are
spatially resolved into two or more components, a...
On 2010 March 19, the Swift/Burst Alert Telescope triggered on a short burst with temporal and spectral characteristics similar to those of soft gamma repeater (SGR) bursts. The source location, however, did not coincide with any known SGR. Subsequent observations of the source error box with the Swift/X-Ray Telescope and the Rossi X-ray Timing Exp...
We have discovered a large number of circular and elliptical shells at 24 μm around luminous central sources with MIPS on board the Spitzer Space Telescope. Our archival follow-up effort has revealed 90% of these circumstellar shells to be previously unknown. The majority of the shells is only visible at 24 μm, but many of the central stars are det...
As a result of an error at the publisher, the name of the author Michiel van der Klis and his affiliation were misspelled. The corrected version appears above. IOP Publishing sincerely regrets this error.
On 2009 June 5, the Gamma-ray Burst Monitor (GBM) onboard the Fermi Gamma-ray Space Telescope triggered on two short and relatively dim bursts with spectral properties similar to soft gamma repeater (SGR) bursts. Independent localizations of the bursts by triangulation with the Konus-RF and with the Swift satellite confirmed their origin from the s...
We have used the Spitzer Space Telescope to obtain time-resolved 3.5- and 4.6-micron light curves of two ultracompact X-ray binaries (UCXBs), 4U061+091 and 4U1626-67. The UCXBs are the physically smallest systems among the X-ray binaries; the known UCXBs harbor a neutron star accretor and have orbital periods of less than an hour, requiring non-mai...
We are conducting a systematic study of the mid-IR properties of systems containing compact objects utilizing both archival and targeted observations obtained with the Spitzer Space Telescope. Here we present our results for a subgroup of the low mass X-ray binaries (XRBs), the Z sources. These neutron star XRBs are the brightest X-ray sources in t...
SGR J1550-5418 (previously known as AXP 1E 1547.0-5408 or PSR J1550-5418) went into three active bursting episodes in 2008 October and in 2009 January and March, emitting hundreds of typical soft gamma repeater bursts in soft gamma rays. The second episode was especially intense, and our untriggered burst search on Fermi/Gamma-ray Burst Monitor (GB...
Interacting binaries consist of a compact object accreting from a non-degenerate companion. This accretion can dominate the luminosity of an interacting binary system. Because SIM-Lite only measures the photocenter of an astrometric target, determining the true astrometric orbits of such systems will be difficult. We have modified the Eclipsing Lig...
We review recent results from mid-infrared observations of cataclysmic variables with the Spitzer Space Telescope. In general, these observations have revealed mid-infrared excesses, above the level expected from the stellar and accretion components, in numerous systems. This excess can be modeled as originating from circumstellar and/or circumbina...
We report the discovery of a 4.5μm counterpart to the anomalous X-ray pulsar (magnetar) 1E 2259+586 with
the Spitzer Space Telescope. The mid-infrared flux density is 6.3 ± 1.0μJy at 4.5μm and <20 μJy (at 95%
confidence) at 8μm, or 0.02% of the 2–10 keV X-ray flux (corrected for extinction). Combining our Spitzer
measurements with previously publis...
The Wide-Field Infrared Survey Explorer (WISE), scheduled for launch in November 2009, will conduct a digital imaging survey of the entire sky in the 3.3, 4.7, 12 and 23 micron bands. Each day during its six-month mission WISE will scan 4800 sq.deg. of the sky, and will downlink approximately 50GB of raw science imaging data and engineering telemet...
We are investigating how SIM-Lite can best be utilized to attain accurate masses for the primary and secondary stars in interacting binary systems. As most of these systems are too distant for ground-based astrometric measurements of their reflex motions, SIM-Lite will allow for astrometric measurements for a wide variety of interacting binary star...
We have discovered a large number of circular and elliptical shells around luminous central sources at 24 mum with the MIPS instrument on board the Spitzer Space Telescope. Most of these shells are not visible in the shorter wavelengths bands of IRAC or archival 2MASS and optical images. On the other hand, many of the central stars are detected in...
Jets are a ubiquitous feature in many different astrophysical objects. They are found in extragalactic sources such as quasars and active galactic nuclei, in Galactic X-ray binary systems, and in newly forming young stellar objects. While the occurrence of jets is clearly connected to accretion processes in all of these objects, the exact mechanism...
We present the ultraviolet-optical-infrared spectral energy distribution of the low inclination novalike cataclysmic variable (CV) V592 Cassiopeiae, including new mid-infrared observations from 3.5 to 24 μm obtained with the Spitzer Space Telescope. At wavelengths shortward of 8 μm, the spectral energy distribution of V592 Cas is dominated by the s...
We have discovered a large number of circular and elliptical shells around luminous central sources at 24(micron) with the MIPS instrument on- board the Spitzer Space Telescope. The shells are only visible at 24(mu)m, but many of the central stars are detected in the 2MASS catalog. Most however, lack an optical counterpart, indicating that we are d...
The recently discovered Soft Gamma Repeater SGR 0418+5729 (GCN #9499, ATEL #2077) was observed with the Chandra HRC-I on 2009 July 12 for an exposure of 24 ks. The brightest X-ray source in the image was clearly identified as the SGR through detection of the 9 sec pulsations. Two additional, uncatalogued X-ray sources were discovered within 3 arcmi...
SIM-Lite will allow for astrometric measurements of the masses for a wide variety of interacting binary star systems. Nearly all interacting binaries are too distant for ground-based astrometric measurements of their reflex motions, thus other techniques must be used to estimate component masses. But for interacting binaries, the presence of on-goi...
We present the first observations of magnetic cataclysmic variables using the Spitzer Space Telescope. We used the Infrared Array Camera to obtain photometry of the Polars EF Eri, GG Leo, V347 Pav, and RX J0154.0-5947 at 3.6, 4.5, 5.8, and 8.0 μm, respectively. In all of our targets, we detect excess mid-infrared emission over that expected from th...
The new transient IGR J16358-4726 was discovered on 2003 March 19 with INTEGRAL. We detected the source serendipitously during our 2003 March 24 observation of SGR 1627-41 with the Chandra X-Ray Observatory at the 1.7 × 10-10 ergs s-1 cm-2 flux level (2-10 keV) with a very high absorption column (NH = 3.3 × 1023 cm-2) and a hard power-law spectrum...
We present near-infrared (IR) magnitudes for all white dwarfs (selected from the catalog of McCook & Sion) contained in the Two Micron All-Sky Survey second incremental data release (2MASS 2IDR). We show that the near-IR color-color diagram is an effective means of identifying candidate binary stars containing a WD and a low-mass, main-sequence sta...
We present detailed spectral and timing analysis of the hard X-ray transient IGR J16358-4726 using multisatellite archival observations. A study of the source flux time history over 6 yr suggests that lower luminosity transient outbursts can be occurring in intervals of at most 1 yr. Joint spectral fits of the higher luminosity outburst using simul...
We present a set of Spitzer 24 μm MIPS time series observations of the M dwarf eclipsing binary star GU Boötis. Our data cover three secondary eclipses of the system: two consecutive events and an additional eclipse 6 weeks later. The study's main purpose is the long-wavelength (and thus limb-darkening-independent) characterization of GU Boo's ligh...
SGR 1627-41 was discovered in 1998 after a single active episode that lasted ~6 weeks. We report here our monitoring results of the decay trend of the persistent X-ray luminosity of the source during the last 5 years. We find an initial temporal power-law decay with index 0.47, reaching a plateau that is followed by a sharp (factor of 10) flux decl...
We present precise localizations of AXP 1E1841-045 and SGR 1627-41 with Chandra. We obtained new infrared observations of SGR 1627-41 and reanalyzed archival observations of AXP 1E1841-045 in order to refine their positions and search for infrared counterparts. A faint source is detected inside the error circle of AXP 1E1841-045. In the case of SGR...
The Multiband Imaging Photometer for Spitzer (MIPS) provides long-wavelength capability for the mission in imaging bands at 24, 70, and 160 μm and measurements of spectral energy distributions between 52 and 100 μm at a spectral resolution of about 7%. By using true detector arrays in each band, it provides both critical sampling of the Spitzer poi...
Cataclysmic variables (CVs) have "traditionally" been observed primarily at short wavelengths because accretion-generated luminosity, which peaks in the optical-ultraviolet, dominates the radiated energy of most systems. Hence, relatively little is known about their infrared (IR) properties. Investigating CVs in the IR will contribute to the unders...
Magnetars are a special class of slowly rotating (period approximately 5-12 s) neutron stars with extremely strong magnetic fields (>10(14 )G)--at least an order of magnitude larger than those of the 'normal' radio pulsars. The potential evolutionary links and differences between these two types of object are still unknown; recent studies, however,...
AX J1845.0–0433 is a persistent X‐ray binary with a O9.5I supergiant companion emitting at a low 0.2–100 keV luminosity of 1035 ergs−1 with seldom flares reaching luminosities of 1036 ergs−1. Variability factors of 50 are observed on short time‐scales of a few ks. The broad‐band, high‐energy spectrum is typical of wind‐fed accreting pulsars (absorp...
At present, 117 Be/neutron star (Be/NS) X‐ray binaries (XRBs) are known in the Galaxy and the Magellanic Clouds, but not a single Be/black hole (Be/BH) binary has been found so far. We carried out the calculations of stellar population synthesis to investigate the case of the apparently missing population of Be/BH XRBs. According to our calculation...
We have obtained optical and infrared photometry of the quiescent soft X‐ray transient XTE J1118+480. In addition to optical and J‐band variations, we present H‐ and
K
s
‐band ellipsoidal variations for this system. We model the variations in all bands simultaneously with the WD98 light curve modeling code. The infrared colors of the secondary...
We propose to compile a low-resolution stellar atlas, sampling all regions of the HR diagram. The goal of the atlas is to provide templates for models of galaxy evolution, as well as calibrators for future space missions. In addition, the targets are intrinsically interesting: little is known about variation of spectral features with spectral or lu...
Cataclysmic variables have been extensively observed at optical, ultraviolet, and Xray
wavelengths, where their white dwarf primary stars and bright accretion disks dominate their
emitted luminosity. Comparatively little is known about the infrared properties of cataclysmic variables.
The assumption that infrared observations would reveal only the...
An IRAC observation of the central star of the old planetary nebula DeHt5 (WD2218+706) reveals excess emission at 8 microns, above that expected from the white dwarf alone. We can match this emission with a 100K blackbody, and it bares striking similarity to the so-far unique 100K excess emission observed for the central star of the Helix nebula (S...
Soft Gamma repeaters (SGRs) and anomalous X-ray pulsars are thought to be 'magnetars', isolated young neutron stars that are powered by the decay of their ultrahigh magnetic fields. At the same time, we now also know of a small sample of radio pulsars with magnetic field strengths approaching or overlapping those of the magnetar candidates, that do...
We propose to use the IRAC and MIPS camera arrays on Spitzer to establish the mid-infrared spectral energy distribution and search for evidence for jet emission contributions at Spitzer wavelengths for three Z sources: GX 349+2, GX 17+2, and Cyg X-2. These neutron star X-ray binaries are the brightest X-ray sources in the Galaxy and also the most r...
We report limits in the planetary-mass regime for companions around the nearest single white dwarf to the Sun, van Maanen's
star (vMa 2), from deep J-band imaging with Gemini North and Spitzer Infrared Array Camera (IRAC) mid-IR photometry. We find no resolved common proper motion companions to vMa 2 at separations
from 3 to 45 arcsec, at a limitin...
We have obtained Hubble Space Telescope/Space Telescope Imaging Spectrograph low-resolution ultraviolet spectra of the X-ray pulsar 4U 1626-67 (=KZ TrA); 4U 1626-67 is unusual even among X-ray pulsars because of its ultrashort binary period (P = 41.4 minutes) and remarkably low mass function (≤1.3 × 10-6 M). The far-UV spectrum was exposed for a to...
We present new insights into the long-term behavior of the cataclysmic variable (CV) CM Phe, based on a data set spanning nine years that includes both photometric and spectroscopic observations. CM Phe was first spectroscopically confirmed as a CV (probably of the novalike class) in 1997. Its orbital period was subsequently found from time-series...
We present ground-based optical, archival 2MASS near-infrared and
Spitzer Space Telescope mid-infrared observations of the counterparts
and local environments of X-ray sources in the Small Magellanic Cloud.
We have constructed broad-band spectral energy distributions spanning
the optical to mid-infrared for known and candidate counterparts. Using
t...
We present a carefully controlled set of Spitzer 24 \micron MIPS time series observations of the low mass eclipsing binary star GU Bo\"otis (GU Boo). Our data cover three secondary eclipses of the system: two consecutive events and an additional eclipse six weeks later. The study's main purpose is the long wavelength characterization of GU Boo's li...
We present the first mid-infrared (5.5-14.5 micron) spectrum of a highly magnetic cataclysmic variable, EF Eridani, obtained with the Infrared Spectrograph on the Spitzer Space Telescope. The spectrum displays a relatively flat, featureless continuum. A spectral energy distribution model consisting of a 9500 K white dwarf, L5 secondary star, cyclot...
We describe the absolute calibration of the Multiband Imaging Photometer for Spitzer (MIPS) 160 micron channel. After the on-orbit discovery of a near-IR ghost image that dominates the signal for sources hotter than about 2000 K, we adopted a strategy utilizing asteroids to transfer the absolute calibrations of the MIPS 24 and 70 micron channels to...
Observations by the AAVSO during the past several days of the polar AM Herculis show that it may be leaving the "normal" faint state it has occupied during the past ~2 years, and becoming bright. We observed AM Her with IRAC during GO-3 as part of program 30249. That program also included two medium-impact TOO observations to be triggered to re-obs...
Citations
... In addition to providing tight constraints on the Universe expansion history, one of the major roles of current [1,2] or future spectroscopic surveys [3,4] is to provide an accurate measurement of the amount of primordial non-gaussianity (PNG) generated during inflation. In particular, these surveys will be focused on the well-known local PNG parameterized by f loc NL [5] such that the primordial gravitational potential field Φ(x) reads ...
... • Three photometric bands (see ref [2]) : 1. The spectral resolution shall be higher than 250 for a homogenously illuminated object of one arcsec size. ...
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... To verify the adapted JAGUAR catalogue could reproduce observed lenses we search for analogues to the lenses found in the Sloan Lens ACS (SLACS) Survey (Bolton et al. 2008) and compare the Einstein radii measurements. The SLACS lenses were analysed by Grillo et al. (2009) and Etherington et al. (2023). We use the values from Grillo et al. (2009) since their measurements of the enclosed mass did not depend on the effective radius of the galaxy, as was the case in Etherington et al. (2023), but purely on the Einstein radius. ...
... To do better with space based observations new satellites have been proposed (e.g., The Theia Collaboration et al. 2017). WFIRST and Euclid (Sanderson et al. 2017;da Silva et al. 2019), which are more general telescopes will also have great astrometry potential. ...
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... The radiation will mainly consist of solar particle events and Galactic cosmic rays. 2 The scientific aim of the Euclid mission is to map the geometry of the Dark Universe using two instruments; the Visible Imager (VIS) 3,4 and the Near Infrared Photometer Spectrometer (NISP). 5 The VIS instrument is a large-scale imager, with a focal plane of 36 4K×4K CCDs, that will do observations to enable Weak Lensing measurements. By measuring the ellipticity of the galaxies in most of the extra-galactic sky, it is possible to infer the mass distribution of the matter that distorts the galaxy shapes and thereby map the Dark Matter. ...
... Specifically, the Euclid Wide Survey (WS) will observe ∼15,000 deg 2 of the sky down to a flux limit of ∼2 × 10 −16 erg cm −2 s −1 (Euclid Collaboration et al. 2022), while the Roman HLS will observe ∼2200 deg 2 down to a flux limit of ∼6 × 10 −17 erg cm −2 s −1 (Spergel et al. 2015). The Euclid Deep Survey will observe 50 deg 2 in three fields to a similar flux limit (Vavrek et al. 2016). ...
... The present paper focuses on the PLM briefly described hereafter, its detailed design and architecture of the PLM being described elsewhere [3] . The PLM comprises a 1.2-m class Korsch-type telescope directing the incoming light towards two separated instruments: the VISible imager(VIS) [4] and the Near-Infrared Spectrometer & Photometer(NISP) [5] [6] , the light is spectrally split between instruments by a dichroic plate. The telescope structure and its mirrors are made out of Silicon Carbide (SiC) to maximize the stability of the optical performance against thermal perturbations of the image quality delivered to the instruments. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/360275539709952-1462907790350_Q64/Anne-Ealet.jpg)
... Applications of the method by ground telescopes includes the PS1 survey (Schlafly et al. 2012). Preliminary studies applied to a space mission have been carried out in Markovič et al. (2017). ...
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... range at a temperature lower than 140K, and the detectors at ~95K. The photometric mode is for the acquisition of images with broad band filters, and the spectroscopic mode is for the acquisition of slitless dispersed images on the detectors [3]. Figure 5. Left: NISP picture during integration, and right: NISP as designed with units described. ...
Reference: Euclid cleanliness and contamination control
... The bright Galactic Halo black hole system, XTE J1118+480, is monitored by several groups at different wavelengths [6] [7]. We note long-term variability over 800 days of observations. ...
Reference: Monitoring LMXBs with the Faulkes Telescopes
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