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A Third Hot White Dwarf Companion Detected by Kepler
Joshua A. Carter, Saul Rappaport, Daniel Fabrycky
We have found a system listed in the Kepler Binary Catalog (3.273 day period; Prsa et al. 2010) that we have determined is comprised of a low-mass, thermally-bloated, hot white dwa…
On the Possibility of Tidal Formation of Binary Planets Around Ordinary Stars
Philipp Podsiadlowski, Saul Rappaport, John M. Fregeau +1
The planet formation process and subsequent planet migration may lead to configurations resulting in strong dynamical interactions among the various planets. Well-studied possible…
Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
Jeffrey A. Blackburne, David Pooley, Saul Rappaport +1
Microlensing perturbations to the flux ratios of gravitationally lensed quasar images can vary with wavelength because of the chromatic dependence of the accretion disk's apparent…
Explosive Common-Envelope Ejection: Implications for Gamma-Ray Bursts and Low-Mass Black-Hole Binaries
Philipp Podsiadlowski, Natasha Ivanova, Stephen Justham +1
We present a new mechanism for the ejection of a common envelope in a massive binary, where the energy source is nuclear energy rather than orbital energy. This can occur during th…
Observations of Doppler Boosting in Kepler Lightcurves
Marten H. van Kerkwijk, Saul A. Rappaport, Rene P. Breton +3
Among the initial results from Kepler were two striking lightcurves, for KOI 74 and KOI 81, in which the relative depths of the primary and secondary eclipses showed that the more…