New Parameters and Transit Timing Studies for OGLE2-TR-L9 b

Дата и время публикации : 2010-07-04T21:43:17Z

Авторы публикации и институты :
M. Lendl
C. Afonso
J. Koppenhoefer
N. Nikolov
Th. Henning
M. Swain
J. Greiner

Ссылка на журнал-издание: A&A, 522, A29 (2010)
Коментарии к cтатье: Ссылка на журнал-издание не найдена
Первичная категория: astro-ph.EP

Все категории : astro-ph.EP

Краткий обзор статьи: Context: Repeated observations of exoplanet transits allow us to refine the planetary parameters and probe them for any time dependent variations. In particular deviations of the period from a strictly linear ephemeris, transit timing variations (TTVs), can indicate the presence of additional bodies in the planetary system. Aims: Our goal was to reexamine the largely unstudied OGLE2-TR-L9 system with high cadence, multi-color photometry in order to refine the planetary parameters and probe the system for TTVs. Methods: We observed five full transits of OGLE2-TR-L9 with the GROND instrument at the ESO/MPG 2.2 m telescope at La Silla Observatory. GROND is a multichannel imager that allowed us to gather simultaneous light curves in the g’, r’, i’, and z’ filters. Results: From our analysis we find that the semi-major axis and the inclination differ from the previously published values. With the newly observed transits, we were able to refine the ephemeris to 2454492.80008(+/- 0.00014) + 2.48553417(+/- 6.4) x 10^-7 E. The newly derived parameters are a=0.0418 (+/- 0.0015) AU, r_p =1.67 (+/- 0.05) R_j, and inc=82.47{deg} (+/- 0.12), differing significantly in a and inc from the previously published values. Within our data, we find indications for TTVs.

Category: Physics