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arXiv, 2014

DOI: 10.48550/arxiv.1411.5045

Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 1(447), p. 691-697

DOI: 10.1093/mnras/stu2412

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Discovery of ZZ Cetis in detached white dwarf plus main-sequence binaries

Journal article published in 2014 by S. Pyrzas, B. T. Gaensicke, B. T. Gansicke, J. J. Hermes, C. M. Copperwheat, A. Rebassa Mansergas, V. S. Dhillon ORCID, S. P. Littlefair ORCID, T. R. Marsh, S. G. Parsons, C. D. J. Savoury, M. R. Schreiber, S. C. C. Barros ORCID, J. Bento, E. Breedt and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present the first results of a dedicated search for pulsating white dwarfs (WDs) in detached white dwarf plus main-sequence binaries. Candidate systems were selected from a catalogue of WD+MS binaries, based on the surface gravities and effective temperatures of the WDs. We observed a total of 26 systems using ULTRACAM mounted on ESO's 3.5m New Technology Telescope (NTT) at La Silla. Our photometric observations reveal pulsations in seven WDs of our sample, including the first pulsating white dwarf with a main-sequence companion in a post common envelope binary, SDSSJ1136+0409. Asteroseismology of these new pulsating systems will provide crucial insight into how binary interactions, particularly the common envelope phase, affect the internal structure and evolution of WDs. In addition, our observations have revealed the partially eclipsing nature of one of our targets, SDSSJ1223-0056.