Search for Extra-solar Planet and Dark Stars by Gravitational Microlensing

利用引力微透镜寻找太阳系外行星和暗星

• 批准号: 19340058
• 负责人: MURAKI Yasushi
• 金额: $ 11.9万
• 依托单位: Konan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19340058/
• 关键词: 重力レンズ効果; ダークマター; 太陽系外惑星; 暗黒天体; 暗天体; 変光星; 一般相対性理論; 重力レンズ法; 系外惑星; 大マゼラン雲; ミラ型変光星; セファイド型変光星; CCDカメラ; 二重レンズ効果; ブラックスター; 褐色矮星; スノーライン; 星の質量関数; MOA望遠鏡; マウントジョン天文台; 木星; 土星; 地球型小型惑星

The Japan-NZ astronomy collaboration known as MOA (Microlensing Observations in Astrophysics) was formed in 1995 with the aim of searching for a component of dark matter in the form of MACHOs (Massive Compact Halo Objects) and also for extra-solar planets using the gravitational microlensing technique. This technique uses the gravitational fields of stars and other massive objects to effectively form large lenses in space as predicted by general relativity. The feasibility of the microlensing technique was pointed out by Bohdan Paczynski in 1986. He proposed monitoring as many stars as possible in the Magellanic Clouds and the galactic bulge to find gravitational lenses in the galactic halo or the galactic disc.The MOA collaboration commenced observations in 1995 using a 0.6m telescope at the Mt John observatory in NZ. In 2005 a 1.8m telescope was installed at Mt John by Japan. Since that time more than 500 microlensing events have been found each year towards the galactic bulge. Also, … More events have been found towards the Magellanic Clouds.The events found by MOA were made publicly available via the world wide web to enable other observatories to monitor selected events, in particular those with high magnifications. This resulted in the discovery of 16 extra-solar planets orbiting stars in the galactic disc and the galactic bulge. These planets were found just beyond the snowlines of their host stars. This is the region of maximum sensitivity of the microlensing technique, and it also the region where ice-giant and gas-giant planets form according to the core accretion theory. The data on these planets complements data being obtained on closer-in planets by the radial velocity and transit techniques.In addition to the above discoveries, a new class of extra-solar planets was discovered by MOA. These planets are not bound to stars. They have masses similar to that of Jupiter, and they are approximately as abundant as stars in the galaxy.Finally, the Konan University group of MOA completed the analysis of observations made between 1999 and 2005 towards the Large Magellanic Cloud with the 0.6m telescope at Mt John. Approximately 9,000 Miras and 13,000 Cepheid variable stars were found. Those results will be presented in elsewhere. Less

日本-新西兰天文学合作组织 MOA（天体物理学微透镜观测）成立于 1995 年，旨在寻找 MACHO（巨型致密晕天体）形式的暗物质成分，并利用正如广义相对论所预测的，引力微透镜技术利用恒星和其他大质量物体的引力场在太空中有效地形成大透镜。 Bohdan Paczynski于1986年指出了微透镜技术的可行性。他建议监测麦哲伦星云和银河核球中尽可能多的恒星，以寻找银晕或银盘中的引力透镜。MOA合作于1995年开始观测新西兰约翰山天文台使用 0.6m 望远镜，2005 年安装了 1.8m 望远镜。从那时起，日本每年都会发现超过 500 个朝向银河系核球的微透镜事件。此外，还发现了更多朝向麦哲伦星云的事件。MOA 发现的事件通过万维网公开。使其他天文台能够监测选定的事件，特别是高倍率的事件，这导致在银盘和银河核球中发现了 16 颗绕恒星运行的太阳系外行星。这是微透镜技术最敏感的区域，也是根据核心吸积理论形成冰巨行星和气巨行星的区域。行星补充了通过径向速度和凌日技术在较近的行星上获得的数据。除了上述发现之外，MOA还发现了一类新的太阳系外行星，这些行星与恒星无关。最后，农业部甲南大学组利用约翰山0.6m望远镜完成了1999年至2005年对大麦哲伦星云的观测分析。发现了大约 9,000 颗米拉星和 13,000 颗造父变星，这些结果将在其他地方公布。

项目成果

A Cold Neptune Mass Planet OGLE-2007-BLG-368Lb : Cold Neptune are common

冷海王星质量行星 OGLE-2007-BLG-368Lb：冷海王星很常见

• 发表时间: 2010
• 期刊: Astrophysical Journal 740
• 作者: T.Sumi;et al
• 通讯作者: et al

MOAI望遠鏡によるLMC領域の変光天体データベース

使用MOAI望远镜建立LMC地区可变天文物体数据库

• 发表时间: 2010
• 作者: 和田光平、村木綏;他
• 通讯作者: 他

Determining the Physical Lens Parameters of the Binary Gravitational Microlensing Event MOA-2009-BLG-016

确定二元引力微透镜事件的物理透镜参数 MOA-2009-BLG-016

• 发表时间: 2010
• 期刊: The Astrophysical Journal
• 作者: Hwang;K.-H.;他
• 通讯作者: 他

MASSES AND ORBITAL CONSTRAINTS FOR THE OGLE-2006-BLG-109Lb,c JUPITER/SATURN ANALOG PLANETARY SYSTEM

• DOI: 10.1088/0004-637x/713/2/837
• 发表时间: 2009-11
• 期刊: The Astrophysical Journal
• 作者: David P. Bennett;S. Rhie;Sergei Nikolaev;B. Gaudi;A. Udalski;A. Gould;G. Christie;D. Maoz;Subo Dong;J. Mccormick;M. Szymański;P. Tristram;Bruce Macintosh;K. Cook;M. Kubiak;G. Pietrzyński;G. Pietrzyński;I. Soszyński;O. Szewczyk;K. Ulaczyk;Ł. Wyrzykowski;Ł. Wyrzykowski;D. Depoy;C. Han;S. Kaspi;C.‐U. Lee;F. Mallia;T. Natusch;B.-G. Park;R. Pogge;D. Polishook;F. Abe;I. Bond;C. Botzler;A. Fukui;J. Hearnshaw;Y. Itow;K. Kamiya;A. Korpela;P. Kilmartin;W. Lin;K. Masuda;Y. Matsubara;M. Motomura;Yasushi Muraki;S. Nakamura;Teppei Okumura;K. Ohnishi;Y. Perrott;N. Rattenbury;T. Sako;T. Saito;S. Sato;L. Skuljan;D. Sullivan;T. Sumi;W. Sweatman;P. Yock;M. Albrow;A. Allan;J. Beaulieu;D. Bramich;M. Burgdorf;C. Coutures;Martin Dominik;S. Dieters;P. Fouqué;J. Greenhill;K. Horne;C. Snodgrass;I. A. Steele;Y. Tsapras;R. Collaborations;B. Chaboyer;A. Crocker;A. S. Frank

1.8m MOAII望遠鏡を用いた太陽系内小惑星の探索

使用1.8m MOAII望远镜寻找太阳系小行星

• 发表时间: 2010
• 作者: 中尾俊作;他MOAグループ
• 通讯作者: 他MOAグループ