HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity

Дата и время публикации : 2013-04-08T09:20:38Z

Авторы публикации и институты :
M. Mohler-Fischer
L. Mancini
J. D. Hartman
G. B. Bakos
K. Penev
D. Bayliss
A. Jordan
Z. Csubry
G. Zhou
M. Rabus
N. Nikolov
R. Brahm
N. Espinoza
L. A. Buchhave
B. Beky
V. Suc
B. Csak
T. Henning
D. J. Wright
C. G. Tinney
B. C. Addison
B. Schmidt
R. W. Noyes
I. Papp
J. Lazar
P. Sari
P. Conroy

Ссылка на журнал-издание: A&A, 558 (2013), A55 (13 pages)
Коментарии к cтатье: 13 pages, 8 figures, accepted by A&A
Первичная категория: astro-ph.EP

Все категории : astro-ph.EP

Краткий обзор статьи: We report the discovery of HATS-2b, the second transiting extrasolar planet detected by the HATSouth survey. HATS-2b is moving on a circular orbit around a V=13.6 mag, K-type dwarf star (GSC 6665-00236), at a separation of 0.0230 pm 0.0003 AU and with a period of 1.3541 days. The planetary parameters have been robustly determined using a simultaneous fit of the HATSouth, MPG/ESO~2.2,m/GROND, Faulkes Telescope South/Spectral transit photometry and MPG/ESO~2.2,m/FEROS, Euler~1.2,m/CORALIE, AAT~3.9,m/CYCLOPS radial-velocity measurements. HATS-2b has a mass of 1.37 pm 0.16 M_J, a radius of 1.14 pm 0.03 R_J and an equilibrium temperature of 1567 pm 30 K. The host star has a mass of 0.88 pm 0.04 M_Sun, radius of 0.89 pm 0.02 R_Sun and shows starspot activity. We characterized the stellar activity by analysing two photometric follow-up transit light curves taken with the GROND instrument, both obtained simultaneously in four optical bands (covering the wavelength range of 3860-9520 AA). The two light curves contain anomalies compatible with starspots on the photosphere of the parent star along the same transit chord.

Category: Physics