Rapid Orbital Decay in the 12.75-minute WD+WD Binary J0651+2844

Дата и время публикации : 2012-08-24T20:00:07Z

Авторы публикации и институты :
J. J. Hermes
Mukremin Kilic
Warren R. Brown
D. E. Winget
Carlos Allende Prieto
A. Gianninas
Anjum S. Mukadam
Antonio Cabrera-Lavers
Scott J. Kenyon

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: For publication in ApJ Letters; 6 pages, 3 figures, 2 tables
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR, astro-ph.GA

Краткий обзор статьи: We report the detection of orbital decay in the 12.75-min, detached binary white dwarf (WD) SDSS J065133.338+284423.37 (hereafter J0651). Our photometric observations over a 13-month baseline constrain the orbital period to 765.206543(55) s and indicate the orbit is decreasing as a rate of (-9.8 +/- 2.8) x 10^(-12) s/s (or -0.31 +/- 0.09 ms/yr). We revise the system parameters based on our new photometric and spectroscopic observations: J0651 contains two WDs with M1 = 0.26 +/- 0.04 Msun and M2 = 0.50 +/- 0.04 Msun. General relativity predicts orbital decay due to gravitational wave radiation of (-8.2 +/- 1.7) x 10^(-12) s/s (or -0.26 +/- 0.05 ms/yr). Our observed rate of orbital decay is consistent with this expectation. J0651 is currently the second-loudest gravitational wave source known in the milli-Hertz range and the loudest non-interacting binary, which makes it an excellent verification source for future missions aimed at directly detecting gravitational waves. Our work establishes the feasibility of monitoring this system’s orbital period decay at optical wavelengths.

Category: Physics