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

Дата и время публикации : 2013-03-04T14:54:42Z

Авторы публикации и институты :
S. P. Littlefair
C. D.
J. Savoury
V. S. Dhillon
T. R. Marsh
B. T. Gaensicke
T. Butterley
R. W. Wilson
J. Southworth
C. A. Watson

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 6 pages, 4 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: 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.

Category: Physics