arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.0457astro-ph.EP
收藏

OGLE-TR-111 b缺乏Transit时序变化:六个新时期的再分析

Lack of Transit Timing Variations of OGLE-TR-111b: A re-analysis with six new epochs

E. R. Adams, M. Lopez-Morales, J. L. Elliot, S. Seager, D. J. Osip

摘要:

我们提出了六个新的过境的系外行星OGLE-TR-111 b观察与麦哲伦望远镜在智利之间的2008年4月和2009年3月。我们结合这些新的过境与五个以前公布的过境时代,这个星球在2005年和2006年之间,扩展分析过境时间变化报告这个系统。我们得到了一个新的行星半径值1.019 +/- 0.026 R_J,这是之前报道的半径1.067 +/- 0.054 R_J(Winn et al. 2007)和0.922 +/- 0.057 R_J(Diaz et al. 2008)的中间值。我们还研究了Diaz等人(2008)的过境时间变化和持续时间变化。我们对所有11个过境时期的分析没有发现任何偏离大于2 σ的点,大多数点都在1 σ以内。虽然凌日持续时间名义上在数据的四年跨度内减少,但测光中的系统误差可以解释这一结果。因此,没有令人信服的证据表明该系统存在时间或持续时间变化。数值积分给出了OGLE-TR-111 b与第二颗行星2:1平均运动共振的质量上限约为1 M_E。

英文摘要:

We present six new transits of the exoplanet OGLE-TR-111b observed with the Magellan Telescopes in Chile between April 2008 and March 2009. We combine these new transits with five previously published transit epochs for this planet between 2005 and 2006 to extend the analysis of transit timing variations reported for this system. We derive a new planetary radius value of 1.019 +/- 0.026 R_J, which is intermediate to the previously reported radii of 1.067 +/- 0.054 R_J (Winn et al. 2007) and 0.922 +/- 0.057 R_J (Diaz et al. 2008). We also examine the transit timing variation and duration change claims of Diaz et al. (2008). Our analysis of all eleven transit epochs does not reveal any points with deviations larger than 2 sigma, and most points are well within 1 sigma. Although the transit duration nominally decreases over the four year span of the data, systematic errors in the photometry can account for this result. Therefore, there is no compelling evidence for either a timing or a duration variation in this system. Numerical integrations place an upper limit of about 1 M_E on the mass of a potential second planet in a 2:1 mean-motion resonance with OGLE-TR-111b.

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。

↑