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Introduction
Skills and Expertise
Publications
Publications (7)
We propose that the reported dearth of $Kepler$ Objects of Interest (KOIs)
with orbital periods $P_{\rm orb} \lesssim 2-3\;$days around stars with
rotation periods $P_{\rm rot} \lesssim 5-10\;$days can be attributed to tidal
ingestion of close-in planets by their host stars. We show that the planet
distribution in this region of the $\log{P_{\rm or...
We introduce GYRE, a new open-source stellar oscillation code which solves
the adiabatic/non-adiabatic pulsation equations using a novel Magnus Multiple
Shooting (MMS) numerical scheme. The code has a global error scaling of up to
6th order in the grid spacing, and can therefore achieve high accuracy with few
grid points. It is moreover robust and...
We present a new oscillation code, GYRE, which solves the stellar pulsation
equations (both adiabatic and non-adiabatic) using a novel Magnus Multiple
Shooting numerical scheme devised to overcome certain weaknesses of the usual
relaxation and shooting schemes appearing in the literature. The code is
accurate (up to 6th order in the number of grid...
The magnetocentrifugal disk wind mechanism is the leading candidate for
producing the large-scale, bipolar jets commonly seen in protostellar systems.
I present a detailed formulation of a global, radially self-similar model for a
non-ideal disk that launches a magnetocentrifugal wind. This formulation
generalizes the conductivity tensor formalism...
We present a new approach to modeling linearized, non-radial pulsations in differentially rotating, massive stars. As a first step in this direction, we consider adiabatic pulsations and adopt the Cowling approximation that perturbations of the gravitational potential and its radial derivative are negligible. The angular dependence of the pulsation...
Abstract– The variation in sizes of chondrules from one chondrite to the next is thought to be due to some sorting process in the early solar nebula. Hypotheses for the sorting process include chondrule sorting by mass and sorting by some aerodynamic mechanism; one such aerodynamic mechanism is the process of turbulent concentration (TC). We presen...
Statistical tests of several sets of chondrules support the hypothesis
of sorting by an aerodynamic process, specifically the turbulent
concentration mechanism. The tests rule out several other classes of
sorting mechanisms.