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The structure and fate of white dwarf merger remnants
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2014 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 438, no 1, 14-34 p.Article in journal (Refereed) Published
Abstract [en]

We present a large parameter study where we investigate the structure of white dwarf (WD) merger remnants after the dynamical phase. A wide range of WD masses and compositions are explored, and we also probe the effect of different initial conditions. We investigated the degree of mixing between the WDs, the conditions for detonations as well as the amount of gas ejected. We find that systems with lower mass ratios have more total angular momentum and as a result more mass is flung out in a tidal tail. Nuclear burning can affect the amount of mass ejected. Many WD binaries that contain a helium-rich WD achieve the conditions to trigger a detonation. In contrast, for carbon-oxygen-transferring systems, only the most massive mergers with a total mass M greater than or similar to 2.1 M-circle dot detonate. Even systems with lower mass may detonate long after the merger if the remnant remains above the Chandrasekhar mass and carbon is ignited at the centre. Finally, our findings are discussed in the context of several possible observed astrophysical events and stellar systems, such as hot subdwarfs, R Coronae Borealis stars, single massive WDs, supernovae of Type Ia and other transient events. A large data base containing 225 WD merger remnants is made available via a dedicated web page.

Place, publisher, year, edition, pages
2014. Vol. 438, no 1, 14-34 p.
Keyword [en]
accretion, accretion disks, hydrodynamics, nuclear reactions, nucleosynthesis, abundances, white dwarfs
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-101239DOI: 10.1093/mnras/stt1766ISI: 000330457100023OAI: oai:DiVA.org:su-101239DiVA: diva2:703511
Funder
Swedish Research Council, 621-2012-4870
Note

AuthorCount:4;

Available from: 2014-03-07 Created: 2014-03-03 Last updated: 2017-12-05Bibliographically approved

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