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Ellipsoidal Oscillations Induced by Substellar Companions: A Prospect for the Kepler Mission
Eric Pfahl, Phil Arras, Bill Paxton
Hundreds of substellar companions to solar-type stars will be discovered with the Kepler satellite. Kepler's extreme photometric precision gives access to low-amplitude stellar var…
Non-dissipative tidal synchronization in accreting binary white dwarf systems
Etienne Racine, E. Sterl Phinney, Phil Arras
We study a non-dissipative hydrodynamical mechanism that can stabilize the spin of the accretor in an ultra-compact double white dwarf binary. This novel synchronization mechanism…
Pulsational Instabilities in Accreting White Dwarfs
Phil Arras, Dean M. Townsley, Lars Bildsten
(Abridged) The Cataclysmic Variable (CV) population harbors a diverse range of donor stars and accreting white dwarfs (WDs). A range of WD masses is expected, from low mass Helium…
Quasi-Periodic Oscillations from Magnetorotational Turbulence
Phil Arras, Omer Blaes, Neal J. Turner
Quasi-periodic oscillations (QPOs) in the X-ray lightcurves of accreting neutron star and black hole binaries have been widely interpreted as being due to standing wave modes in ac…
Thermal Structure and Radius Evolution of Irradiated Gas Giant Planets
Phil Arras, Lars Bildsten
We consider the thermal structure and radii of strongly irradiated gas giant planets over a range in mass and irradiating flux. The cooling rate of the planet is sensitive to the s…
White Dwarf Heating and Subsequent Cooling in Dwarf Nova Outbursts
Anthony L. Piro, Phil Arras, Lars Bildsten
We follow the time dependent thermal evolution of a white dwarf (WD) undergoing sudden accretion in a dwarf nova outburst, using both simulations and analytic estimates. The post-o…