Infrared Spectra of Comets as a Barometer for Their Evolution

彗星的红外光谱作为其演化的晴雨表

• 批准号: 21340040
• 负责人: KIMURA Hiroshi
• 金额: $ 11.81万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21340040/
• 关键词: 光学赤外線天文学; モデル化; 理論天文学; 惑星起源・進化; 彗星; ダスト

We have found that the fractal dimension of aggregated dust particles in comets determines the strength of peaks characteristic of olivine detected in the infrared spectra of dust in cometary comae, while the volume fraction and carbonization of organic refractory material in the dust aggregates play an important role in the determination of the peak wavelengths. Furthermore, both an increase in the fractal dimension and the carbonization of organic refractory material are associated with the formation of a dust mantle on the surface of a comet. Therefore, the infrared spectra of cometary comae can be regarded as a barometer of the evolution of comets as well as the alteration of comet grain properties. Since the processing of comet dust proceeds with the orbit of the parent-body comet, we expect that a thorough analysis of infrared data will reveal a correlation between the spectral features characteristic of olivine and the orbital semi-major axes of comets.

我们发现，彗星尘埃聚集体的分形维数决定了彗星彗星尘埃红外光谱中橄榄石特征峰的强度，而尘埃聚集体中有机耐火材料的体积分数和碳化程度对确定峰波长起着重要作用。此外，分形维数的增加和有机耐火材料的碳化都与彗星表面尘埃地幔的形成有关。因此，彗星彗星的红外光谱可以作为彗星演化和彗星颗粒性质变化的晴雨表。由于彗星尘埃的处理是随着母体彗星的轨道进行的，我们预计，对红外数据的彻底分析将揭示橄榄石的光谱特征与彗星轨道半长轴之间的相关性。

项目成果

Possible Photoelectric Dust Levitation Around Asteroids

小行星周围可能存在光电尘埃悬浮

• 发表时间: 2012
• 作者: Senshu;H.;Kobayashi;M.;Wada;K.;Namiki;N.;Kimura;H.;Yamamoto;T.;Hirata;N.;Miyamoto;H.;and Matsui;T.
• 通讯作者: T.

Collisional Growth Conditions for Dust Aggregates

粉尘聚集体的碰撞生长条件

• DOI: 10.1088/0004-637x/702/2/1490
• 发表时间: 2009
• 期刊: Astrophysical Journal
• 影响因子: 4.9
• 作者: K. Wada;H. Tanaka;T. Suyama;H. Kimura;T. Yamamoto
• 通讯作者: T. Yamamoto

Nonthermal crystallization of amorphous silicate in comet

无定形硅酸盐在彗星中的非热结晶

• DOI: 10.5047/eps.2008.11.002
• 发表时间: 2010
• 期刊: Earth, Plantes and Space
• 作者: T. Yamamoto;T. Chigai;H. Kimura;K. K. Tanaka
• 通讯作者: K. K. Tanaka

Present Status of the Mercury Dust Monitor (MDM) Project in BepiColombo Mission

BepiColombo 任务汞尘监测仪 (MDM) 项目的现状

• 发表时间: 2011
• 作者: Shibata;H.
• 通讯作者: H.

Numerical Simulations of Collisions between Different-sized Dust Aggregates

不同尺寸粉尘聚集体碰撞的数值模拟

• 发表时间: 2011
• 作者: Wada;K.
• 通讯作者: K.