新的观测结果和对Gliese 436 b凌日参数变化的可能检测
New Observations and a Possible Detection of Parameter Variations in the Transits of Gliese 436b
摘要：
我们目前的地面观测的海王星质量的行星Gl 436 b的3.5米望远镜在阿帕奇点天文台和其他支持望远镜获得。其中包括2005年初观测到的一次凌日，比最早报告的凌日探测时间早了两年多。我们已经编译了迄今为止所有可用的过境数据，并使用JKTEBOP代码进行统一建模。在约3.3年的基线上，我们没有检测到振幅大于约1分钟的任何过境时间变化。然而，我们确实发现了轨道倾角、过境宽度和过境深度增加的自洽趋势的可能证据，这支持了Gl 436 b在非共振轨道上被另一颗小于12个地球质量的行星扰动的假设。
英文摘要：
We present ground-based observations of the transiting Neptune-mass planet Gl 436b obtained with the 3.5-meter telescope at Apache Point Observatory and other supporting telescopes. Included in this is an observed transit in early 2005, over two years before the earliest reported transit detection. We have compiled all available transit data to date and perform a uniform modeling using the JKTEBOP code. We do not detect any transit timing variations of amplitude greater than ~1 minute over the ~3.3 year baseline. We do however find possible evidence for a self-consistent trend of increasing orbital inclination, transit width, and transit depth, which supports the supposition that Gl 436b is being perturbed by another planet of < 12 Earth Masses in a non-resonant orbit.
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