GD 552: a cataclysmic variable with a brown dwarf companion?

E. Unda-Sanzana, T.R. Marsh, B.T. Gaensicke, P.F.L. Maxted, L. Morales-Rueda, V.S. Dhillon, T.D. Thoroughgood, E. Tremou, Christopher Watson, R. Hinojosa-Goni

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

GD 552 is a high proper motion star with the strong, double-peaked emission lines characteristic of the dwarf nova class of cataclysmic variable (CV) star, and yet no outburst has been detected during the past 12yr of monitoring. We present spectroscopy taken with the aim of detecting emission from the mass donor in this system. We fail to do so at a level which allows us to rule out the presence of a near-main-sequence star donor. Given GD 552's orbital period of 103 min, this suggests that it is either a system that has evolved through the ~80-minute orbital period minimum of CV stars and now has a brown dwarf mass donor, or that has formed with a brown dwarf donor in the first place. This model explains the low observed orbital velocity of the white dwarf and GD 552's low luminosity. It is also consistent with the absence of outbursts from the system.
Original languageEnglish
Pages (from-to)889-897
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume388
Issue number2
DOIs
Publication statusPublished - Aug 2008

ASJC Scopus subject areas

  • Space and Planetary Science

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