Search for new celestial objects using microlensing effect

利用微透镜效应寻找新的天体

基本信息

批准号：
14002006
负责人：
MURAKI Yasushi
金额：
$ 360.26万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Specially Promoted Research
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14002006/
关键词：
gravitational lensing extrasolar planet dark matter extrasolar terrestrial planet planetary science large telescope MACHO Large CCD camera ダークマタターブラックホール恒星

项目摘要

The main goals of the MOA project are the search for non-luminous astrophysical objects comprising a significant fraction of dark matter of the Galaxy, and also the search for Earth-like planets orbiting distant stars in the Galaxy. The phenomenon of gravitational microlensing offers a practical procedure for carrying out both these goals. To accomplish the goals, a wide-field optical telescope of diameter 1.8m was assembled in Japan during 2003. A telescope dome of diameter 8m, and a large CCD camera with 80 million pixels, were also fabricated in Japan at the same time. During 2004, the telescope, dome and camera were installed at the Mt. John Observatory of the University of Canterbury in New Zealand. First light occurred on March 1^<st> 2005.Main results: the first clear discovery of an extra-solar planet by gravitational microlensing occurred in July 2003. The discovery was made jointly by the MOA and OGLE groups. Additional measurements were subsequently made by the Hubble Space Telescope. The planet discovered in this event is similar to Jupiter.Its mass is 2.6 times that of Jupiter, and it orbits a star of 0.63 solar mass at an orbital radius of 4.3 AU.Another Jovian mass planet was found in March 2005. This discovery was made in a microlensing event of high magnification in collaboration with the OGLE, MicroFUN and PLANET/Robonet groups. During April 2005, a Neptune-like planet was found in an event of high magnification in collaboration with the OGLE and MicroFUN groups. Finally, in August 2005, an Earth-like planet was found in collaboration with the PLANET and OGLE/Robonet groups. The latter discoveries imply that our solar system is not a lonely system in our Galaxy

MOA项目的主要目标是寻找包含银河系暗物质很大一部分的不发光天体物理物体，以及寻找绕银河系遥远恒星运行的类地行星。引力微透镜现象为实现这两个目标提供了实用的程序。为了实现这一目标，日本于2003年组装了直径1.8m的宽视场光学望远镜，同时还制造了直径8m的望远镜圆顶和8000万像素的大型CCD相机。 2004年，望远镜、圆顶和相机被安装在新西兰坎特伯雷大学约翰山天文台。第一缕光出现于2005年3月1日。主要成果：2003年7月，通过微引力透镜首次明确发现了太阳系外行星。这一发现是由MOA和OGLE小组共同完成的。随后哈勃太空望远镜进行了额外的测量。这次事件中发现的行星与木星相似。它的质量是木星的2.6倍，绕着一颗0.63太阳质量的恒星运行，轨道半径为4.3天文单位。另一颗木星质量行星于2005年3月被发现。这一发现是与 OGLE、MicroFUN 和 PLANET/Robonet 小组合作，在高倍率微透镜事件中制作。 2005 年 4 月期间，与 OGLE 和 MicroFUN 小组合作，在一次高倍放大的事件中发现了一颗类海王星行星。最终，2005 年 8 月，在 PLANET 和 OGLE/Robonet 小组的合作下，发现了一颗类地行星。后者的发现意味着我们的太阳系并不是银河系中一个孤独的系统