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arXiv 1007.0589astro-ph.EP
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OGLE2-TR-L9 b的新参数和Transit定时研究

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

M. Lendl, C. Afonso, J. Koppenhoefer, N. Nikolov, Th. Henning, M. Swain, J. Greiner

摘要:

背景:对系外行星凌日的重复观察使我们能够细化行星参数并探测它们是否存在任何与时间相关的变化。特别是从一个严格的线性星历的周期偏差,凌日时间变化(TTV),可以表明在行星系的其他机构的存在。目的:我们的目标是重新检查大部分未经研究的OGLE 2-TR-L9系统,具有高节奏,多色测光,以改进行星参数并探测TTV系统。方法:我们在La Silla天文台的ESO/MPG 2.2 m望远镜上用GROND仪器观测了OGLE 2-TR-L9的5次完整凌日。GROND是一款多通道成像仪,它允许我们在g ',r',i '和z'滤波器中同时收集光变曲线。结果:从我们的分析中,我们发现,半长轴和倾角不同于以前公布的值。利用新观测到的凌日,我们能够将星历表精确到2454492.80008(+/- 0.00014)+ 2.48553417(+/- 6.4)x 10^-7 E。新得到的参数为a=0.0418(+/-0.0015)AU,r_p =1.67(+/-0.05)R_j,inc=82.47°(+/-0.12)。在我们的数据中,我们发现了TTV的迹象。

英文摘要:

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° (+/- 0.12), differing significantly in a and inc from the previously published values. Within our data, we find indications for TTVs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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