The Merger Rate of Extremely Low Mass White Dwarf Binaries: Links to the Formation of AM CVn Stars and Underluminous Supernovae - Astrophysics > Astrophysics of GalaxiesReportar como inadecuado




The Merger Rate of Extremely Low Mass White Dwarf Binaries: Links to the Formation of AM CVn Stars and Underluminous Supernovae - Astrophysics > Astrophysics of Galaxies - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We study a complete, colour-selected sample of double-degenerate binarysystems containing extremely low mass ELM <0.25 Msol white dwarfs WDs. Weshow, for the first time, that Milky Way disk ELM WDs have a merger rate ofapproximately 4 x 10^-5-yr due to gravitational wave radiation. The mergerend-product depends on the mass ratio of the binary. The ELM WD systems thatundergo stable mass transfer can account for >3% of AM CVn stars. Moreimportantly, the ELM WD systems that may detonate merge at a rate comparable tothe estimated rate of underluminous SNe, rare explosions estimated to produceonly ~0.2 Msol worth of ejecta. At least 25% of our ELM WD sample belong to theold thick disk and halo components of the Milky Way. Thus, if merging ELM WDsystems are the progenitors of underluminous SNe, transient surveys must findthem in both elliptical and spiral galaxies.



Autor: Warren R. Brown, Mukremin Kilic, Carlos Allende Prieto, Scott J. Kenyon

Fuente: https://arxiv.org/



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