The way to a double degenerate: ~15-20 per cent of 1M ≤ M ≤ 8M stars have an M > 1M companion

Ygal Y. Klein, Boaz Katz

Research output: Contribution to journalArticlepeer-review

Abstract

We find that~15-20 per cent of A-type stars or red giants are bound with a massive companion (Msecondary > 1M) in an intermediate wide orbit (0.5 < P < 5000 yr). These massive binaries are expected to form wide-orbit, double-degenerate systems (WODDs) within ≲10 Gyr implying that ~10 per cent of white dwarfs (WDs) are expected to be part of a WODD with a lighter WD companion. These findings are based on an analysis of previous adaptive optics observations of A-type stars and radial velocity measurements of red giants and shed light on the connection between multiplicity function of stars and detected double degenerates. We expect that Gaia will find ~10 new WODDs within 20 pc from the sun. These results put a stringent constraint on the collision model of Type Ia supernovae in which triple stellar systems that include a WODD as the inner binary are required to be abundant.

Original languageEnglish
Pages (from-to)L44-L48
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume465
Issue number1
DOIs
StatePublished - 1 Feb 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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