期刊
ASTROPHYSICAL JOURNAL
卷 891, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab733c
关键词
White dwarf stars; Stellar kinematics; Stellar ages; Type Ia supernovae; Bayesian statistics
资金
- National Science Foundation (NSF) [AST-1614933]
- Netherlands Research Council NWO [639.041.645]
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 1000 high-mass WDs (0.8-1.3 M). 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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