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Eclipsing post-common envelope binaries from the Catalina surveys

Parsons, S. G. and Gänsicke, B. T. and Marsh, T. R. and Drake, A. J. and Dhillon, V. S. and Littlefair, S. P. and Pyrzas, S. and Rebassa-Mansergas, A. and Schreiber, M. R. (2013) Eclipsing post-common envelope binaries from the Catalina surveys. Monthly Notices of the Royal Astronomical Society, 429 (1). pp. 256-268. ISSN 0035-8711. doi:10.1093/mnras/sts332.

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We analyse the Catalina Real-time Transient Survey light curves of 835 spectroscopically confirmed white dwarf plus main-sequence binaries from the Sloan Digital Sky Survey (SDSS) with g < 19, in search of new eclipsing systems. We identify 29 eclipsing systems, 12 of which were previously unknown. This brings the total number of eclipsing white dwarf plus main-sequence binaries to 49. Our set of new eclipsing systems contains two with periods of 1.9 and 2.3 d, making them the longest period eclipsing white dwarf binaries known. We also identify one system which shows very large ellipsoidal modulation (almost 0.3 mag), implying that the system is both very close to Roche lobe overflow and at high inclination. However, our follow-up photometry failed to firmly detect an eclipse, meaning that either this system contains a cool white dwarf and hence the eclipse is very shallow and undetectable in our red-sensitive photometry or that it is non-eclipsing. Radial velocity measurements for the main-sequence stars in three of our newly identified eclipsing systems imply that their white dwarf masses are lower than those inferred from modelling their SDSS spectra. 13 non-eclipsing post-common envelope binaries were also identified, from either reflection or ellipsoidal modulation effects. The white dwarfs in our newly discovered eclipsing systems span a wide range of parameters, including low-mass (∼0.3 M_⊙), very hot (80 000 K) and a DC white dwarf. The spectral types of the main-sequence stars range from M2 to M6. This makes our sample ideal for testing white dwarf and low-mass star mass–radius relationships as well as close binary evolution.

Item Type:Article
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URLURL TypeDescription
Gänsicke, B. T.0000-0002-2761-3005
Marsh, T. R.0000-0002-2498-7589
Littlefair, S. P.0000-0001-7221-855X
Additional Information:© 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. First published online: December 1, 2012. Accepted 2012 October 31. Received 2012 October 24; in original form 2012 September 11. SGP acknowledges support from the Joint Committee ESO Government of Chile. ULTRACAM, BTG, TRM, VSD and SPL are supported by the Science and Technology Facilities Council (STFC). AR-M acknowledges financial support from FONDECYT in the form of grant number 3110049. MRS thanks FONDECYT (project 1100782) and the Millennium Science Initiative, Chilean Ministry of Economy, Nucleus P10-022-F. The results presented in this paper are based on observations collected at the European Southern Observatory under programme IDs 086.D-0161 and 087.D-0557. The CSS survey is funded by the National Aeronautics and Space Administration under Grant No. NNG05GF22G issued through the Science Mission Directorate Near-Earth Objects Observations Programme. The CRTS survey is supported by the US National Science Foundation under grants AST-0909182. The Liverpool Telescope is operated on the island of La Palma by Liverpool John Moores University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias with financial support from the UK Science and Technology Facilities Council.
Funding AgencyGrant Number
ESO Government of Chile Joint CommitteeUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Millenium Science Initiative, Chilean Ministry of EconomyP10-022-F
NASA Science Mission Directorate Near-Earth Objects Observations ProgramNNG05GF22G
Subject Keywords: binaries: close binaries: eclipsing stars: low-mass stars: white dwarfs
Issue or Number:1
Record Number:CaltechAUTHORS:20130625-100257774
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Official Citation: S. G. Parsons, B. T. Gänsicke, T. R. Marsh, A. J. Drake, V. S. Dhillon, S. P. Littlefair, S. Pyrzas, A. Rebassa-Mansergas, and M. R. Schreiber Eclipsing post-common envelope binaries from the Catalina surveys MNRAS (February 11, 2013) Vol. 429 256-268 first published online December 1, 2012 doi:10.1093/mnras/sts332
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39073
Deposited By: Ruth Sustaita
Deposited On:25 Jun 2013 18:00
Last Modified:09 Nov 2021 23:42

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