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Double white dwarf merger products among high-mass white dwarfs

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arxiv 1910.09558 v3 pith:53H5THUL submitted 2019-10-21 astro-ph.SR astro-ph.GAastro-ph.HE

Sihao Cheng , Jeffrey D. Cummings , Brice Ménard , Silvia Toonen This is my paper · ORCID
classification astro-ph.SRastro-ph.GAastro-ph.HE
keywords double-wdmergerhigh-massproductswhitedoubledwarffraction
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abstract

Double white dwarf (double-WD) binaries may merge within a Hubble time and produce high-mass WDs. Compared to other high-mass WDs, the double-WD merger products have higher velocity dispersion because they are older. With the power of Gaia data, we show strong evidence for double-WD merger products among high-mass WDs by analyzing the transverse-velocity distribution of more than a thousand high-mass WDs (0.8--1.3 $M_\odot$). We estimate that the fraction of double-WD merger products in our sample is about 20 %. We also obtain a precise double-WD merger rate and its mass dependence. Our merger rate estimates are close to binary population synthesis results and support the idea that double-WD mergers may contribute to a significant fraction of type Ia supernovae.

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