The ELM Survey. V. Merging Massive White Dwarf Binaries

Abstract

We present the discovery of 17 low mass white dwarfs (WDs) in short-period P<1 day binaries. Our sample includes four objects with remarkable log(g)~5 surface gravities and orbital solutions that require them to be double degenerate binaries. All of the lowest surface gravity WDs have metal lines in their spectra implying long gravitational settling times or on-going accretion. Notably, six of the WDs in our sample have binary merger times <10 Gyr. Four have >=0.9 Msun companions. If the companions are massive WDs, these four binaries will evolve into stable mass transfer AM CVn systems and possibly explode as underluminous supernovae. If the companions are neutron stars, then these may be milli-second pulsar binaries. These discoveries increase the number of detached, double degenerate binaries in the ELM Survey to 54; 31 of these binaries will merge within a Hubble time.

12 pages, accepted in ApJ

References in corpus (13)

• Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries
• The SEGUE Stellar Parameter Pipeline. III. Comparison with High-Resolution Spectroscopy of SDSS/SEGUE Field Stars
• Formation of millisecond pulsars with CO white dwarf companions - II. Accretion, spin-up, true ages and comparison to MSPs with He white dwarf companions
• The ELM Survey. I. A Complete Sample of Extremely Low Mass White Dwarfs
• Unstable Helium Shell Burning on Accreting White Dwarfs
• Hypervelocity Stars. I. The Spectroscopic Survey
• The masses of PSR J1911-5958A and its white dwarf companion
• A Successful Targeted Search for Hypervelocity Stars
• Hypervelocity Stars III. The Space Density and Ejection History of Main Sequence Stars from the Galactic Center
• Discovery of a Bright, Extremely Low-Mass White Dwarf in a Close Double Degenerate System
• The Discovery of a Companion to the Lowest Mass White Dwarf
• The puzzling properties of the Helium White Dwarf orbiting the millisecond pulsar PSR J1911-5958A in NGC 6752
• The Runaway White Dwarf LP400-22 Has a Companion

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