2020
DOI: 10.1093/mnras/staa1761
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SDSS J124043.01+671034.68: the partially burned remnant of a low-mass white dwarf that underwent thermonuclear ignition?

Abstract: The white dwarf SDSS J124043.01+671034.68 (SDSS J1240+6710) was previously found to have an oxygen-dominated atmosphere with significant traces of neon, magnesium, and silicon. A possible origin via a violent late thermal pulse or binary interactions has been suggested to explain this very unusual photospheric composition. We report the additional detection of carbon, sodium, and aluminium in far-ultraviolet and optical follow-up spectroscopy. No iron-group elements are detected, with tight upper limits on tit… Show more

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Cited by 7 publications
(2 citation statements)
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“…These are white dwarfs with velocities that are markedly different than the other stars in their neighbourhoods, and also feature unusual surface composition (Kepler et al 2016;Shen et al 2018). It has been suggested that these are white dwarfs that underwent some episode of runaway thermonuclear burning that stopped before it consumed the entire white dwarf (Gänsicke et al 2020). If the reaction did not stop, then the white dwarf would have explode as a type Ia supernova and leave no remnant behind.…”
Section: Hypervelocity White Dwarfsmentioning
confidence: 99%
“…These are white dwarfs with velocities that are markedly different than the other stars in their neighbourhoods, and also feature unusual surface composition (Kepler et al 2016;Shen et al 2018). It has been suggested that these are white dwarfs that underwent some episode of runaway thermonuclear burning that stopped before it consumed the entire white dwarf (Gänsicke et al 2020). If the reaction did not stop, then the white dwarf would have explode as a type Ia supernova and leave no remnant behind.…”
Section: Hypervelocity White Dwarfsmentioning
confidence: 99%
“…Both these hot objects and their cooler, puffier cousins have been referred to as "D 6 " stars, after the "dynamically driven, doubledegenerate, double-detonation" model for their formation (Shen et al 2018b). While other classes of models for thermonuclear explosions producing high-velocity WDs have been explored (Raddi et al 2019;Jones et al 2019;Gänsicke et al 2020), the D 6 scenario is currently the only model predicting velocities above 1000 km s −1 .…”
Section: Introductionmentioning
confidence: 99%