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17th European White Dwarf Workshop: SDSS1257+5428 - an extreme mass-ratio double white dwarf
Marsh, Tom (2010)
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mla
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Marsh T. "17th European White Dwarf Workshop: SDSS1257+5428 - an extreme mass-ratio double white dwarf.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100819_010_eurowd_0001. Accessed 30 Oct 2020.
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Marsh, T. (2010). 17th European White Dwarf Workshop: SDSS1257+5428 - an extreme mass-ratio double white dwarf. timms video: Universität Tübingen. Retrieved October 30, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100819_010_eurowd_0001
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Marsh, T. (2010). 17th European White Dwarf Workshop: SDSS1257+5428 - an extreme mass-ratio double white dwarf [Online video]. 19 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100819_010_eurowd_0001 (Accessed: 30 October 2020).
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title: 17th European White Dwarf Workshop: SDSS1257+5428 - an extreme mass-ratio double white dwarf
alt. title: 17th European White Dwarf Workshop - White dwarfs in detached binaries
creator: Marsh, Tom (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, SDSS1257+5428, extreme mass-ratio double white dwarf, Tom Marsh
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: SDSS1257+5428: an extreme mass-ratio double white dwarf (T.Marsh1, B.Gaensicke1, D.Steeghs1, J.Southworth2, D.Koester3, V.Harris4, L.Merry5) (1Department of Physics, University of Warwick, Coventry CV4 7AL, UK, 2Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG, UK, 3Institut für Theoretische Physik und Astrophysik, University of Kiel, 24098 Kiel, Germany, 4133 Jackman Close, Abingdon, Oxfordshire OX14 3GB, UK, 5Flat 4, 8 The Lakes, Larkfield, Kent ME20 6GE, UK) We present time-resolved spectroscopy of SDSS J1257+5428, a white dwarf from the Sloan Digital Sky Survey. In 2009 SDSS J1257+5428 was found to be part of a binary with a period of 4.56 hours, and fits to its spectrum combined with its orbital parameters led to the suggestion that it had a high-mass compact companion, either a neutron star or black-hole. Here we show instead that it consists of two DA white dwarfs, one of high mass, around 1M (Sonne) and one of low mass 0.2M (Sun). SDSS J1257+5428 is of exceptional interest as it is the first double white dwarf known which has an extreme enough mass-ratio to survive the future onset of mass transfer and become a semi-detached hydrogen-deficient interacting binary (an AM CVn star). We present evidence which shows that the more massive white dwarf is rapidly rotating with V sin i > 500 kms-1 as the result of the most recent stage of mass transfer from which its low mass helium white dwarf companion emerged. This is contrary to all current models of the formation of double white dwarfs and suggests that these models may not account for all significant pathways to these objects, which may also be the progenitors of Type Ia supernovae.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-19
dc type: image
localtype: video
identifier: UT_20100819_010_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637396149477698461