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.

我们制定了光在过境的系外行星的大气中的传播，并推导出一个公式的折射角的光线通过大气传播。该公式提供了精确的值，即使是对入射到大气中的小的影响参数的射线。我们提出了一种方法，估计大气层的尺度高度的光变曲线在中央星星前面的过渡的系外行星。本文系统地计算了不同波长光线通过等温流体静力平衡模式大气的光线追迹，并讨论了过渡行星半径明显增大的现象。将结果应用于伽利略卫星的观测，通过木星的大气层进行观测。对观察结果的分析表明，理论大致解释了观察结果，但表明存在一些理论中没有考虑到的效应。

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.

Sublimation temperature of circumstellar dust particles and its importance for dust ring formation Earth

星周尘埃颗粒的升华温度及其对尘埃环形成的重要性地球

• 发表时间: 2011
• 期刊: Planets, Space
• 作者: Kobayashi;H.;Kimura;H.;Watanabe;Yamamoto;T.;and Muller;S.
• 通讯作者: S.