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ヨネハラ アツノリ
YONEHARA ATSUNORI
米原 厚憲 所属 京都産業大学 理学部 宇宙物理・気象学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2014/07 |
| 形態種別 | その他 |
| 標題 | A terrestrial planet in a similar to 1-AU orbit around one member of a similar to 15-AU binary |
| 執筆形態 | その他 |
| 掲載誌名 | SCIENCE |
| 出版社・発行元 | AMER ASSOC ADVANCEMENT SCIENCE |
| 巻・号・頁 | 345(6192),pp.46-49 |
| 著者・共著者 | A. Gould,A. Udalski,I. -G. Shin,I. Porritt,J. Skowron,C. Han,J. C. Yee,S. Kozlowski,J. -Y. Choi,R. Poleski,L. Wyrzykowski,K. Ulaczyk,P. Pietrukowicz,P. Mroz,M. K. Szymanski,M. Kubiak,I. Soszynski,G. Pietrzynski,B. S. Gaudi,G. W. Christie,J. Drummond,J. McCormick,T. Natusch,H. Ngan,T. -G. Tan,M. Albrow,D. L. DePoy,K. -H. Hwang,Y. K. Jung,C. -U. Lee,H. Park,R. W. Pogge,F. Abe,D. P. Bennett,I. A. Bond,C. S. Botzler,M. Freeman,A. Fukui,D. Fukunaga,Y. Itow,N. Koshimoto,P. Larsen,C. H. Ling,K. Masuda,Y. Matsubara,Y. Muraki,S. Namba,K. Ohnishi,L. Philpott,N. J. Rattenbury,To. Saito,D. J. Sullivan,T. Sumi,D. Suzuki,P. J. Tristram,N. Tsurumi,K. Wada,N. Yamai,P. C. M. Yock,A. Yonehara,Y. Shvartzvald,D. Maoz,S. Kaspi,M. Friedmann |
| 概要 | Using gravitational microlensing, we detected a cold terrestrial planet orbiting one member of a binary star system. The planet has low mass (twice Earth's) and lies projected at similar to 0.8 astronomical units (AU) from its host star, about the distance between Earth and the Sun. However, the planet's temperature is much lower, <60 Kelvin, because the host star is only 0.10 to 0.15 solar masses and therefore more than 400 times less luminous than the Sun. The host itself orbits a slightly more massive companion with projected separation of 10 to 15 AU. This detection is consistent with such systems being very common. Straightforward modification of current microlensing search strategies could increase sensitivity to planets in binary systems. With more detections, such binary-star planetary systems could constrain models of planet formation and evolution. |
| DOI | 10.1126/science.1251527 |
| ISSN | 0036-8075/1095-9203 |