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

S. P. Littlefair*, C. D. J. Savoury, V. S. Dhillon, T. R. Marsh, B. T. Gaensicke, T. Butterleym, R. W. Wilson, J. Southworth, C. A. Watson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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 per cent 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 donor with a confirmed sub-stellar mass 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 K-d = 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.

Original languageEnglish
Pages (from-to)2820-2825
JournalMonthly Notices of the Royal Astronomical Society
Volume431
Issue number3
DOIs
Publication statusPublished - 26 Mar 2013

Keywords

  • binaries: eclipsing
  • stars: dwarf novae
  • stars: individual: SDSS J1433+1011
  • novae, cataclysmic variables
  • PERIOD CATACLYSMIC VARIABLES
  • DWARF LIKE SECONDARIES
  • WHITE-DWARF
  • T-DWARFS
  • INFRARED-SPECTROSCOPY
  • RADIAL-VELOCITY
  • STARS
  • MINIMUM
  • ROTATION
  • SPECTRA

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