通过引力微透镜发现木星/土星类似物。

Discovery of a Jupiter/Saturn analog with gravitational microlensing.

作者信息

Gaudi B S, Bennett D P, Udalski A, Gould A, Christie G W, Maoz D, Dong S, McCormick J, Szymanski M K, Tristram P J, Nikolaev S, Paczynski B, Kubiak M, Pietrzynski G, Soszynski I, Szewczyk O, Ulaczyk K, Wyrzykowski L, Depoy D L, Han C, Kaspi S, Lee C-U, Mallia F, Natusch T, Pogge R W, Park B-G, Abe F, Bond I A, Botzler C S, Fukui A, Hearnshaw J B, Itow Y, Kamiya K, Korpela A V, Kilmartin P M, Lin W, Masuda K, Matsubara Y, Motomura M, Muraki Y, Nakamura S, Okumura T, Ohnishi K, Rattenbury N J, Sako T, Saito To, Sato S, Skuljan L, Sullivan D J, Sumi T, Sweatman W L, Yock P C M, Albrow M D, Allan A, Beaulieu J-P, Burgdorf M J, Cook K H, Coutures C, Dominik M, Dieters S, Fouqué P, Greenhill J, Horne K, Steele I, Tsapras Y, Chaboyer B, Crocker A, Frank S, Macintosh B

机构信息

Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA.

出版信息

Science. 2008 Feb 15;319(5865):927-30. doi: 10.1126/science.1151947.

DOI:10.1126/science.1151947

PMID:18276883

Abstract

Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency of solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multiple-planet systems containing analogs of all the solar system planets except Mercury. We report the detection of a multiple-planet system with microlensing. We identify two planets with masses of approximately 0.71 and approximately 0.27 times the mass of Jupiter and orbital separations of approximately 2.3 and approximately 4.6 astronomical units orbiting a primary star of mass approximately 0.50 solar mass at a distance of approximately 1.5 kiloparsecs. This system resembles a scaled version of our solar system in that the mass ratio, separation ratio, and equilibrium temperatures of the planets are similar to those of Jupiter and Saturn. These planets could not have been detected with other techniques; their discovery from only six confirmed microlensing planet detections suggests that solar system analogs may be common.

摘要

对太阳系外行星的搜索发现了令人惊讶的多样的行星系统，但类似太阳系的行星系统的频率仍然未知。引力微透镜行星搜索方法可能对包含除水星外所有太阳系行星类似物的多行星系统敏感。我们报告了通过微透镜探测到一个多行星系统。我们识别出两颗行星，质量分别约为木星质量的0.71倍和约0.27倍，轨道间距分别约为2.3和4.6天文单位，围绕一颗质量约为0.50太阳质量的主恒星运行，距离约为1.5千秒差距。这个系统类似于我们太阳系的一个缩放版本，因为行星的质量比、间距比和平衡温度与木星和土星的相似。用其他技术无法探测到这些行星；仅从六个已确认的微透镜行星探测中发现它们表明类似太阳系的行星系统可能很常见。