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arXiv, 2013

DOI: 10.48550/arxiv.1303.0715

Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 3(431), p. 2820-2825

DOI: 10.1093/mnras/stt378

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A J-band detection of the sub-stellar mass donor in SDSS J1433+1011

Journal article published in 2013 by S. P. Littlefair ORCID, C. D., C. D. J. Savoury, V. S. Dhillon ORCID, T. R. Marsh, B. T. Gansicke, B. T. Gaensicke, T. Butterleym, T. Butterley, R. W. Wilson, J. Southworth, C. A. Watson
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 time-resolved J-band spectroscopy of the short period cataclysmic variable SDSS J143317.78+101123.3. We detect absorption lines from the sub-stellar donor star in this system, which contributes 38 +/- 5% to the J-band light. From the relative strengths of the absorption lines in the J-band, we estimate the spectral type of the donor star to be L2 +/- 1. These data are the first spectroscopic detection of a confirmed sub-stellar donor in a cataclysmic variable, and the spectral type is consistent with that expected from semi-empirical evolutionary models. Using skew mapping, we have been able to derive an estimate for the radial velocity of the donor of Kd = 520 +/- 60 km/s. This value is consistent with, though much less precise than, predictions from mass determinations found via photometric fitting of the eclipse light curves.