Transit timing variation and transmission spectroscopy analyses of the hot Neptune GJ3470b
Transit timing variation and transmission spectroscopy analyses of the hot Neptune GJ3470b
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DOI：
10.1093/mnras/stw2148
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发表时间：
2016-12-01
影响因子：
4.8
通讯作者：
Haislip, J. B.
中科院分区：
文献类型：
--
作者：
Awiphan, S.;Kerins, E.;Haislip, J. B.
GJ3470b是一颗围绕M矮星运行的热海王星系外行星，也是第一颗呈现瑞利散射的亚木星行星。本文对泰国国家天文台2.4 m和0.5 m望远镜以及智利0.6 m PROMPT-8望远镜的多波长光学光度进行了过境时变（TTV）和透射光谱分析。我们的TTV分析使我们能够确定系统中第二颗行星的质量上限。不包括周期小于10天的热木星或轨道周期在2.5至4.0天之间的行星。综合光学和近红外透射光谱分析表明，高海拔地区以H/ he为主的雾霾（平均分子量1.08 +/- 0.20）颗粒丰度高。我们还认为，以前的近红外数据有利于GJ3470b大气中甲烷的存在。
GJ3470b is a hot Neptune exoplanet orbiting an M dwarf and the first sub-Jovian planet to exhibit Rayleigh scattering. We present transit timing variation (TTV) and transmission spectroscopy analyses of multiwavelength optical photometry from 2.4-m and 0.5-m telescopes at the Thai National Observatory, and the 0.6-m PROMPT-8 telescope in Chile. Our TTV analysis allows us to place an upper mass limit for a second planet in the system. The presence of a hot Jupiter with a period of less than 10 d or a planet with an orbital period between 2.5 and 4.0 d are excluded. Combined optical and near-infrared transmission spectroscopy favour an H/He-dominated haze (mean molecular weight 1.08 +/- 0.20) with high particle abundance at high altitude. We also argue that previous near-infrared data favour the presence of methane in the atmosphere of GJ3470b.