Search for dark stars and planets by the grabitaional microlensing method

利用引力微透镜法寻找暗恒星和行星

• 批准号: 23540339
• 负责人: MURAKI Yasushi
• 金额: $ 3.24万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23540339/
• 关键词: 太陽系外惑星; 重力レンズ効果; ダークマター; 褐色矮星; 暗黒天体; MOA; スーパーアース; 系外惑星; 重力レンズ; 暗天体; ニュージーランド; 岩石型系外惑星

The Japan-NZ astronomy collaboration known as MOA (Microlensing Observations in Astrophysics) installed a 1.8m telescope at Mt John in 2005. Since that time more than 500 microlensing events have been found each year towards the galactic bulge.This resulted in the discovery of 53 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.

2005年，日本-新西兰天文学合作项目MOA（Microlensing Observations in Astrophysics）在约翰山安装了一台1.8米的望远镜。 从那时起，每年都有超过500个微透镜事件发生在银河系隆起处，这导致了53个太阳系外行星在银河系圆盘和银河系隆起中绕恒星运行。 这些行星是在它们的主星的雪线之外被发现的。 这是微透镜技术最灵敏的区域，也是根据核心吸积理论形成冰巨星和气体巨星的区域。这些行星的数据补充了通过径向速度和凌日技术获得的更近行星的数据。 除了上述发现，MOA还发现了一类新的太阳系外行星。这些行星不受恒星的约束。它们的质量与木星相似，数量大约与银河系中的恒星一样多。

项目成果

OGLE-2008-BLG-510: First automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary?

OGLE-2008-BLG-510：首次自动实时检测弱微透镜异常 - 棕矮星还是双星？

• DOI: 10.1111/j.1365-2966.2012.21233.x
• 发表时间: 2008
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8

Two topics from MOA collaboration; the q-ratio of binary lenses and the fundamental and overtone of Red Variable Stars

MOA 合作的两个主题；

• 发表时间: 2012
• 作者: Konstantinos Dimopoulos;Kazunori Kohri;David H. Lyth;Tomohiro Matsuda;Y. Ｍuraki
• 通讯作者: Y. Ｍuraki

MOA-2011-BLG-293Lb: A TEST OF PURE SURVEY MICROLENSING PLANET DETECTIONS

• DOI: 10.1088/0004-637x/755/2/102
• 发表时间: 2012-01
• 期刊: The Astrophysical Journal
• 作者: J. Yee;Y. Shvartzvald;A. Gal-yam;I. Bond;A. Udalski;S. Kozłowski;C. Han;A. Gould;J. Skowron;D. Suzuki;F. Abe;David P. Bennett;C. Botzler;P. Chote;M. Freeman;A. Fukui;K. Furusawa;Y. Itow;S. Kobara;C. Ling;K. Masuda;Y. Matsubara;N. Miyake;Yasushi Muraki;Kantaro Ohmori;K. Ohnishi;N. Rattenbury;T. Saito;D. Sullivan;T. Sumi;K. Suzuki;W. Sweatman;S. Takino;P. Tristram;K. Wada;M. Szymański;M. Kubiak;G. Pietrzyński;G. Pietrzyński;I. Soszyński;R. Poleski;K. Ulaczyk;Ł. Wyrzykowski;Ł. Wyrzykowski;P. Pietrukowicz;William H. Allen;L. Almeida;V. Batista;M. Bos;G. Christie;D. Depoy;S. Dong;Jack D. Drummond;I. Finkelman;B. Gaudi;E. Gorbikov;C. Henderson;D. Higgins;Francisco Jablonski;S. Kaspi;I. Manulis;D. Maoz;J. Mccormick;D. McGregor;L. Monard;D. Moorhouse;J. A. Muñoz;T. Natusch;H. Ngan;E. Ofek;R. Pogge;R. Santallo;Thiam-Guan Tan;G. Thornley;I. Shin;J.-Y. Choi;S.-Y. Park;C.‐U. Lee;J. Koo

Detection of the Extra-Solar Planets by the Micro-Gravitaional Lensing Method

微引力透镜法探测太阳系外行星

• 发表时间: 2013
• 作者: R. Nakamura;A. Bamba;T. Dotani;M. Ishida;R. Yamazaki;K. Kohri;Yasushi Muraki
• 通讯作者: Yasushi Muraki

NZでの天文観測ー重力レンズ効果を利用した暗黒天体の探索

新西兰的天文观测 - 使用引力透镜寻找黑暗物体

• 作者: T. Kondo;H. Utsunomiya;S. Goriely;I. Daoutidis;C. Iwamoto;H. Akimune;A. Okamoto;T. Yamagata;M. Kamata;O. Itoh;H. Toyokawa;Y.-W. Lui;H. Harada;F. Kitatani;S. Hilaire;and A.J. Koning;Yasushi Muraki
• 通讯作者: Yasushi Muraki