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- W3103485472 abstract "Extremely low mass white dwarfs are very rare objects likely formed in compact binary systems. We present MMT optical spectroscopy of 42 low-mass white dwarf candidates serendipitously discovered in a survey for hypervelocity B-type stars. One of these objects, SDSS J0917+46, has Teff = 11,288 ± 72 K and log g = 5.48 ± 0.03; with an estimated mass of 0.17 M☉, it is the lowest gravity/mass white dwarf currently known. However, 40 of the low-mass candidates are normal DA white dwarfs with apparently inaccurate SDSS g magnitudes. We revisit the identification of low-mass white dwarf candidates previously found in the SDSS and conclude that four objects have M < 0.2 M☉. None of these white dwarfs show excess emission from a binary companion, and radial velocity searches will be necessary to constrain the nature of the unseen companions." @default.
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- W3103485472 date "2007-05-10" @default.
- W3103485472 modified "2023-10-18" @default.
- W3103485472 title "The Lowest Mass White Dwarf" @default.
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- W3103485472 doi "https://doi.org/10.1086/514327" @default.
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