Theoretical Study of the Thermal Histories of Comets and Parent Bodies of Meterorites

彗星和陨石母体热史的理论研究

• 批准号: 05833011
• 负责人: YAMAMOTO Tetsuo
• 金额: $ 1.02万
• 依托单位: Hokkaido University (1994)Institute of Space and Astronautical Science (1993)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05833011/
• 关键词: Comet; Meteorite; Amorphous ice; Kuiper belt object; Interstellar dust; Planetary science; 隕石母天体; 小惑星; 熱史; 氷; アモルファス

The study of the origins and thermal histories of comets and parent bodies of meterorites leads to the following results :1. A new model of the thermal history of cometary nuclei during residence in the Oort cloud has been obtained, in which particular attention has been paid to the extremely low thermal conductivity of amorphous ice is taken into account.2. Conditions for condensation and preservation of amorphous ice have been theoretically derived. Crystallinity of ices in space has been discussed on the basis of the results.3. Formation of organic materials has been studied by irradiating proton beams on simulated cosmic ices of various composition.4. A tensile strength of grain aggregates has been derived, and the results have been applied to the splitting of comet Shoemaker-Levy 9.5. The following study has also been done in relation to the results 1 to 4 : the origin of the Kuiper-belt objects, mesurements of infrared absorption coefficients of corundum grains, and infrared astronomical study of H_2O and CO ices in interstellar dark clouds.Some of the results have been presented as a series of lectures at the International Summer School on Cosmic Dust Connection held at Erice in June 1994.

通过对彗星和陨石母体的起源和热历史的研究，得出以下结论：1。本文提出了一个新的彗星核在奥尔特云中停留期间的热历史模型，其中特别考虑了无定形冰极低的热导率.从理论上导出了无定形冰凝结和保存的条件。在此基础上讨论了空间冰的结晶度.通过质子束照射不同组成的模拟宇宙冰，研究了有机物质的形成。本文导出了颗粒集合体的抗拉强度，并将结果应用于苏梅克-列维9.5彗星的分裂。对结果1至4，我们还进行了以下研究：柯伊伯带天体的起源，尘埃颗粒红外吸收系数的测量，星际暗云中H_2O和CO冰的红外天文研究，其中一些结果已作为系列讲座于1994年6月在埃里切举行的宇宙尘埃联系国际暑期学校上发表。

项目成果

T.Yamamoto: "Are 1992QB1 and 1993FW Remnant Planetesimals" Publications of Astronomical Society of Japan. 46. L5-L9 (1994)

T.Yamamoto：“1992QB1 和 1993FW 残余星子​​”是日本天文学会出版物。

J.M.Greenberg,H.Mizutani and T.Yamamoto: "A New Derivation of the Tensile Strength of Cometary Nuclei:Application to Comet Shoemaker-Levy9" Astronomy and Astrophysics. (in press). (1995)

J.M.Greenberg、H.Mizutani 和 T.Yamamoto：“彗星核拉伸强度的新推导：应用于彗星 Shoemaker-Levy9”天文学和天体物理学。

A.Kouchi: "Conditions for Candensation and Preseruation of Amorthers Ice and Crystallinity of Astrophysical Ices" Astrouomy and Astrophysics. To be Published. (1994)

A.Kouchi：“阿莫瑟斯冰的凝结和保存以及天体物理冰的结晶度的条件”天体学和天体物理学。

T.Yamamoto,H.Mizutani,and A.Kadota: "Are 1992QBI and 1993FW Remnant Planetesimals?" Publications of Astronomical Society of Japan. 46. L5-L9 (1994)

T.Yamamoto、H.Mizutani 和 A.Kadota：“1992QBI 和 1993FW 是残余星子吗？”

J.Haruyama: "Thermal History of Comets during Residence in the Dort cloud-Effect of Radiogenic Heating under the very Low Thermal Conductivity of Amorphous Ice" Journal of Geophysical Research. No.E8. 15079-15090 (1993)

J.Haruyama：“彗星在多特云中停留期间的热历史 - 非晶冰极低导热率下的放射加热效应”地球物理研究杂志。