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17th European White Dwarf Workshop: White dwarfs as astroparticle physics laboratories
Isern, Jordi (2010)
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Isern J. "17th European White Dwarf Workshop: White dwarfs as astroparticle physics laboratories.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100819_013_eurowd_0001. Accessed 30 Oct 2020.
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Isern, J. (2010). 17th European White Dwarf Workshop: White dwarfs as astroparticle physics laboratories. timms video: Universität Tübingen. Retrieved October 30, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100819_013_eurowd_0001
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Isern, J. (2010). 17th European White Dwarf Workshop: White dwarfs as astroparticle physics laboratories [Online video]. 19 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100819_013_eurowd_0001 (Accessed: 30 October 2020).
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title: 17th European White Dwarf Workshop: White dwarfs as astroparticle physics laboratories
alt. title: 17th European White Dwarf Workshop - Physical processes in white dwarfs and magnetic white dwarfs
creator: Isern, Jordi (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, astroparticle physics laboratories, Jordi Isern
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: Discovery of the Eclipsing Detached Double White Dwarf Binary NLTT 11748 (Justin D. R. Steinfadt1, David L. Kaplan2,3, Avi Shporer1,4, Lars Bildsten1,2, Steve B. Howell5) (1 Department of Physics, Broida Hall, University of California, Santa Barbara, CA 93106, USA, 2 Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA, 3 Hubble Fellow, 4 Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive Suite 102, Santa Barbara, CA 93117, USA, 5 National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA) We report the discovery of the first eclipsing detached double white dwarf (WD) binary, NLTT 11748. In a photometric search for pulsations from this low-mass helium core WD, we discovered approx 180 s 3%-6% dips in the photometry. Subsequent radial velocity measurements found variations with a semi-amplitude K1 = 271 ± 3 km/s (also now reported by Kawka et al.) and confirmed the dips as eclipses caused by an orbiting WD with a mass M2 = 0.648-0.771 M (Sun) for M1 = 0.1-0.2M (Sun). We detect both the primary and secondary eclipses during the Porb = 5.64 hr orbit and measure the secondary's brightness to be 3.5% ± 0.3% of the primary at SDSS-g'. Assuming that the secondary follows the mass-radius relation of a cold C/O WD and including the effects of microlensing in the binary, the primary eclipse yields a primary radius of R1 = 0.043-0.039 R (Sun) for M1 = 0.1-0.2 M (Sun), consistent with the theoretically expected values for a helium core WD with a thick, stably burning hydrogen envelope. I will discuss how our future observational efforts, such as detection of the secondary semi-amplitude K2, multiband high-cadance photometic eclipse observations, and cross system time-delay measurements, will determine M1, yielding accurate WD massradius measurement of both components, as well as a clearer indication of the binary's fate once contact is reached.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-19
dc type: image
localtype: video
identifier: UT_20100819_013_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637396149226873065