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Orbital periods of cataclysmic variables identified by the SDSS. VIII, A slingshot prominence in SDSS J003941.06 + 005427.5?

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Southworth, J. (John), Marsh, T. R., Gänsicke, B. T. (Boris T.), Steeghs, D. (Danny), 1972- and Copperwheat, C. M.. (2010) Orbital periods of cataclysmic variables identified by the SDSS. VIII, A slingshot prominence in SDSS J003941.06 + 005427.5? Astronomy & Astrophysics, Vol.524 . A86. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201015633

Abstract

We present VLT spectroscopy and NTT photometry of the faint cataclysmic binary SDSS J003941.06+005427.5. This object shows triple-peaked Ha emission with all three peaks variable in both strength and velocity. We measure an orbital period of 91.395 +/- 0.093 min from the velocity variations of the wings of the Ha emission line. Using the GALEX and SDSS photometry of this object, we determine a white dwarf temperature of 15 000 K and a very late (greater than or similar to L2) spectral type for the companion star. These measurements, plus the relatively long orbital period, suggest that SDSS J003941.06+005427.5 may be a post-bounce cataclysmic variable. Doppler maps of the Ha and He I 6678 angstrom emission features show an accretion disc with a non-uniform brightness and departures from Keplerian flow. The third emission peak is detected only in Ha and at a relatively low velocity amplitude of 202 +/- 3 kms(-1). We are unable to explain this emission as arising from either the white dwarf, the secondary star, or the accretion disc. We tentatively attribute this mysterious central peak to a coronal loop anchored at the secondary star. If confirmed, this would be the first example of a slingshot prominence in a CV with a low mass-transfer rate and/or a fully convective secondary star.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Dwarf novae, Double stars -- Spectra, Stars, New, Cataclysmic variable stars
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	December 2010
Volume:	Vol.524
Number of Pages:	8
Page Range:	A86
Identification Number:	10.1051/0004-6361/201015633
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Science and Technology Facilities Council (Great Britain) (STFC)
Grant number:	ST/F002599/1 (STFC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/4761