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Variability of massive stars in M31 from the Palomar Transient Factory
Monika D. Soraisam, Lars Bildsten, Maria R. Drout +5
Using data from the (intermediate) Palomar Transient Factory (iPTF), we characterize the time variability of ~500 massive stars in M31. Our sample is those stars which are spectral…
General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system
Kevin B. Burdge, Michael W. Coughlin, Jim Fuller +23
General relativity predicts that short orbital period binaries emit significant gravitational radiation, and the upcoming Laser Interferometer Space Antenna (LISA) is expected to d…
A new class of pulsating hot subdwarfs
Thomas Kupfer, Evan B. Bauer, Kevin B. Burdge +22
Using high-cadence observations from the Zwicky Transient Facility at low Galactic latitudes, we have discovered a new class of pulsating, hot, compact stars. We have found four ca…
Remnants of Subdwarf Helium Donor Stars Ejected from Close Binaries with Thermonuclear Supernovae
Evan B. Bauer, Christopher J. White, Lars Bildsten
Some binary systems composed of a white dwarf (WD) and a hot subdwarf (sdB) helium star will make contact within the helium burning lifetime of the sdB star. The accreted helium on…
Inferring Explosion Properties from Type II-Plateau Supernova Light Curves
Jared A. Goldberg, Lars Bildsten, Bill Paxton
We present advances in modeling Type IIP supernovae using MESA for evolution to shock breakout coupled with STELLA for generating light and radial velocity curves. Explosion models…
Polluted White Dwarfs: Mixing Regions and Diffusion Timescales
Evan B. Bauer, Lars Bildsten
Many isolated white dwarfs (WDs) show spectral evidence of atmospheric metal pollution. Since heavy element sedimentation timescales are short, this most likely indicates ongoing a…