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17th European White Dwarf Workshop: Doppler boosting in the Kepler light curves of KPD 1946+4340 and KOI-74
Bloemen, Steven (2010)
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mla
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Bloemen S. "17th European White Dwarf Workshop: Doppler boosting in the Kepler light curves of KPD 1946+4340 and KOI-74.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100819_005_eurowd_0001. Accessed 30 Oct 2020.
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Bloemen, S. (2010). 17th European White Dwarf Workshop: Doppler boosting in the Kepler light curves of KPD 1946+4340 and KOI-74. timms video: Universität Tübingen. Retrieved October 30, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100819_005_eurowd_0001
harvard
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Bloemen, S. (2010). 17th European White Dwarf Workshop: Doppler boosting in the Kepler light curves of KPD 1946+4340 and KOI-74 [Online video]. 19 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100819_005_eurowd_0001 (Accessed: 30 October 2020).
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title: 17th European White Dwarf Workshop: Doppler boosting in the Kepler light curves of KPD 1946+4340 and KOI-74
alt. title: 17th European White Dwarf Workshop - White dwarfs in detached binaries
creator: Bloemen, Steven (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, Doppler boosting, Kepler light curves, KPD 1946+4340, KOI-74, Steven Bloemen
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: Doppler boosting in the Kepler light curves of KPD 1946+4340 and KOI-74 (S. Bloemen1, T. R. Marsh2, R. H. Østensen1, C. Aerts1,3) (1Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium, 2Department of Physics, University of Warwick, Coventry CV4 7AL, UK, 3Department of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, the Netherlands) We analyzed the spectacular Kepler light curves of KPD 1946+4340, a binary that consists of a subdwarf B star and a white dwarf, and KOI-74, a binary with an A-star primary and a white dwarf secondary. Both systems are eclipsing and show ellipsoidal modulation. The ellipsoidal maxima at orbital phase 0.75 (before the companion eclipses the white dwarf) are found to be higher than the maxima at phase 0.25 (after the eclipse). The observed differences in the flux levels at the two ellipsoidal modulation maxima can be interpreted as the result of Doppler beaming. We model the binary signatures in the light curves, accounting for eclipses, ellipsoidal modulation, reflection, Doppler beaming and gravitational lensing when the white dwarf eclipses the companion. We fit model light curves to the Kepler data and establish the permitted ranges for the system parameters from Markov Chain Monte Carlo simulations. From the amplitude of the observed Doppler beaming we estimate the companions’ radial velocity amplitudes. We present the first comparisons of photometrically determined radial velocities with spectroscopic values.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-19
dc type: image
localtype: video
identifier: UT_20100819_005_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637396139176878452