Search for new objects with microlensing follow-up observations

通过微透镜后续观测寻找新天体

• 批准号: 17340074
• 负责人: ABE Fumio
• 金额: $ 10.76万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340074/
• 关键词: Astronomy; Astrophysics; Extrasolar Planet; Optical Astronomy; Gravitational Lensing

Searches for extra-solar planets with gravitational microlensing need detailed analyses of the light curves of the light curves of the microlensing events. To do so, intensive follow-up observations are necessary as well as the event survey.This project is aimed to do timely follow-up observations with world-wide telescope networks. The observations have been done with Mt. John 61-cm telescope, Ishigaki 105cm telescope, and collaborations with world-wide telescope networks. From the analyses of the obtained light curves, a giant planet was discovered in OGLE 2005-BLG-071. It was the second planet discovered with microlensing. Then, a 5.5 Earth mass planet was discovered in OGLE 2005-BLG-390. It was the first icy planet discovered outside of our solar system. Furthermore, a planetary system very similar to our Jupiter and Saturn was discovered in OGLE 2006-BLG-109. It was the first planetary system discovered with microlensing and showed effectiveness of this method to find such planetary systems. Discoveries of planets continued. In 2007, four candidates (MOA 2007-BLG-192, 197, 308, and 379) have been discovered and the analyses are in progress.These results showed new scope of extrasolar planets which is hard to study with conventional radial-velocity method. The results of microlensing may show the planets like our solar system may be very common in the universe. The discovery of low-mass planet in OGLE 2005-BLG-390 showed effectiveness of this method in finding low-mass planets and showed future possibility of finding Earth-mass planet.

研究太阳系外行星的引力微透镜现象需要对微透镜事件的光变曲线进行详细的分析。要做到这一点，除了进行事件调查外，还需要进行密集的后续观测，本项目的目的是利用世界范围的望远镜网络进行及时的后续观测。观察已经完成了与山。约翰61厘米望远镜，石垣105厘米望远镜，并与世界各地的望远镜网络合作。通过分析所获得的光变曲线，在OGLE 2005-BLG-071中发现了一颗巨行星。这是第二颗用微透镜发现的行星。然后，在OGLE 2005-BLG-390中发现了一颗5.5地球质量的行星。它是太阳系外发现的第一颗冰行星。此外，在OGLE 2006-BLG-109中发现了一个与我们的木星和土星非常相似的行星系统。这是第一个用微透镜发现的行星系统，并证明了这种方法在寻找此类行星系统方面的有效性。行星的发现仍在继续。2007年发现了4颗候选行星（MOA 2007-BLG-192、197、308和379），并正在进行分析，这些结果揭示了传统径向速度方法难以研究的太阳系外行星的新范围。微透镜的结果可能表明，像我们太阳系这样的行星在宇宙中可能非常普遍。OGLE 2005-BLG-390小质量行星的发现表明了该方法在寻找小质量行星方面的有效性，并显示了未来寻找地球质量行星的可能性。

项目成果

石垣天文台でのマイクロレンズ事象追尾観測

石垣天文台的微透镜事件跟踪观测

• 发表时间: 2007
• 作者: Abe;F他18名;福井暁彦;村木綏
• 通讯作者: 村木綏

Analysis Method for MOA II 1.8m-Telescope and its Results in 2005

2005年MOA II 1.8m望远镜分析方法及结果

• 发表时间: 2006
• 作者: Abe;F他18名;福井暁彦;村木綏;阿部文雄;神谷浩紀;奥村卓大;A. Fukui;Y. Muraki;F. Abe;K. Kamiya;T. Okumura;神谷浩紀;住貴宏;K. Kamiya;T. Sumi;阿部文雄;F. Abe;住貴宏;T. Sumi;阿部文雄;神谷浩紀;F. Abe;K. Kamiya;神谷浩紀;岡田千丈;佐々木充洋;K. Kamiya;C. Okada
• 通讯作者: C. Okada

MOA II Microlensing Observation Project : Results of 2005 and The Future

MOA II 微透镜观测项目：2005 年的成果和未来

• 发表时间: 2006
• 作者: Abe;F他18名;福井暁彦;村木綏;阿部文雄;神谷浩紀;奥村卓大;A. Fukui;Y. Muraki;F. Abe;K. Kamiya;T. Okumura;神谷浩紀;住貴宏;K. Kamiya;T. Sumi;阿部文雄;F. Abe;住貴宏;T. Sumi;阿部文雄;神谷浩紀;F. Abe;K. Kamiya;神谷浩紀;岡田千丈;佐々木充洋;K. Kamiya;C. Okada;M. Sasaki;阿部文雄;F. Abe
• 通讯作者: F. Abe

MOA-II重力マイクロレンズ観測計画:1.8m望遠鏡での観測

MOA-II引力微透镜观测计划：1.8m望远镜观测

• 发表时间: 2005
• 作者: Abe;F他18名;福井暁彦;村木綏;阿部文雄;神谷浩紀;奥村卓大;A. Fukui;Y. Muraki;F. Abe;K. Kamiya;T. Okumura;神谷浩紀;住貴宏;K. Kamiya;T. Sumi;阿部文雄;F. Abe;住貴宏;T. Sumi;阿部文雄;神谷浩紀;F. Abe;K. Kamiya;神谷浩紀;岡田千丈;佐々木充洋;K. Kamiya;C. Okada;M. Sasaki;阿部文雄;F. Abe;神谷浩紀;吉岡務;K. Kamiya;T. Yoshioka;神谷浩紀
• 通讯作者: 神谷浩紀

Observation of the First Gravitational Microlensing Event in a Sparse Stellar Field: The Tago Event

• DOI: 10.1086/522296
• 发表时间: 2007-08
• 期刊: The Astrophysical Journal
• 作者: A. Fukui;F. Abe;K. Ayani;M. Fujii;R. Iizuka;Y. Itow;K. Kabumoto;K. Kamiya;T. Kawabata