Study of optical processes in the atmospheres of exoplanets and their feasibility of observations

系外行星大气中的光学过程及其观测可行性研究

• 批准号: 23654065
• 负责人: YAMAMOTO Tetsuo
• 金额: $ 2.25万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23654065/
• 关键词: 系外惑星; 光赤外線天文学; 惑星科学; 光学赤外線天文学; 系外惑星科学; 宇宙物理学

We formulated light propagation in the atmospheres of exoplanets in transit and derived a formula of an angle of refraction for light rays propagating through the atmosphere. The formula provides precise values even for the rays incident with small impact parameters onto the atmosphere. We proposed a method of estimating a scale height of an atmosphere from a light curve at a transition of an exoplanet in front of a central star. Systematic calculations of ray tracing are carried out for the rays passing through model atmospheres under isothermal hydrostatic equilibrium with varying wavelength of the light rays, and discussion was made on apparent increase in the radius of a planet in transition. The results are applied to the observation of Galilean satellites, which are observed through the atmosphere of Jupiter. Analysis of the observation indicates that the theory roughly explains the observation but suggests the presence of some effect that is not taken into account in the theory.

我们推导了光在行星际过境的大气层中的传播公式，并导出了光线在大气层中传播的折射角公式。该公式即使对于入射到大气中的具有较小影响参数的光线也提供了精确值。我们提出了一种从中心恒星前面的系外行星过渡时的光曲线估计大气尺度高度的方法。系统地计算了不同波长的光线在等温静水平衡条件下穿过模式大气的光线轨迹，并讨论了过渡行星半径的明显增大问题。这些结果被应用于伽利略卫星的观测，这些卫星是通过木星的大气层进行观测的。对观测的分析表明，该理论粗略地解释了观测，但暗示了理论中没有考虑到的某些影响的存在。

项目成果

Dust in Photoelectric Sheath around Asteroids

小行星周围光电鞘中的尘埃

• 发表时间: 2012
• 作者: Senshu;H.
• 通讯作者: H.

THE REBOUND CONDITION OF DUST AGGREGATES REVEALED BY NUMERICAL SIMULATION OF THEIR COLLISIONS

• DOI: 10.1088/0004-637x/737/1/36
• 发表时间: 2011-08
• 期刊: The Astrophysical Journal
• 作者: K. Wada;Hidekazu Tanaka;Toru Suyama;H. Kimura;Tetsuo Yamamoto

EVOLUTION OF SNOW LINE IN OPTICALLY THICK PROTOPLANETARY DISKS: EFFECTS OF WATER ICE OPACITY AND DUST GRAIN SIZE

• DOI: 10.1088/0004-637x/738/2/141
• 发表时间: 2011-06
• 期刊: The Astrophysical Journal
• 作者: A. Oka;T. Nakamoto;S. Ida

Refraction of Light in Exoplanet Atmosphere

系外行星大气中的光折射

• 发表时间: 2011
• 作者: Nakamoto;T. and Yamamoto;T.
• 通讯作者: T.

原始惑星系円盤内スノーラインの進化と微惑星の組成

原行星盘雪线的演化和星子的组成

• 发表时间: 2011
• 作者: K. Ueno;T. Mizumoto;K. Hattori;N. Higashi;S. Iwaki;S. Kabuki;Y. Kishimoto;S. Komura;H. Kubo;S. Kurosawa;Y. Matsuoka;K. Miuchi;K. Nakamura;H. Nishimura;J. Parker;Y. Sato;T. Sawano;A. Takada;T. Tanimori;中本泰史
• 通讯作者: 中本泰史