Free-floating planets from core accretion theory: microlensing predictions
文献类型：期刊论文
| 作者 | Ma, Sizheng1,2; Mao, Shude1,2,3,4 ; Ida, Shigeru5; Zhu, Wei6; Lin, Douglas N. C.1,2,3,7
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-09-01 |
| 卷号 | 461期号:1页码:L107-L111 |
| 关键词 | gravitational lensing: micro planets and satellites: detection planets and satellites: formation Galaxy: bulge |
| 英文摘要 | We calculate the microlensing event rate and typical time-scales for the free-floating planet (FFP) population that is predicted by the core accretion theory of planet formation. The event rate is found to be similar to 1.8x10(-3) of that for the stellar population. While the stellar microlensing event time-scale peaks at around 20 d, the median time-scale for FFP events (similar to 0.1 d) is much shorter. Our values for the event rate and the median time-scale are significantly smaller than those required to explain the Sumi et al. result, by factors of similar to 13 and similar to 16, respectively. The inclusion of planets at wide separations does not change the results significantly. This discrepancy may be too significant for standard versions of both the core accretion theory and the gravitational instability model to explain satisfactorily. Therefore, either a modification to the planet formation theory is required or other explanations to the excess of short-time-scale microlensing events are needed. Our predictions can be tested by ongoing microlensing experiment such as Korean Microlensing Telescope Network, and by future satellite missions such as WFIRST and Euclid. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GALACTIC BULGE ; DETERMINISTIC MODEL ; MASS ; STARS ; LENS ; DISTRIBUTIONS ; EXOPLANETS ; NETWORK ; SYSTEMS ; GIANTS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000383269900022 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6867]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 2.Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 4.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Alan Turing Bldg,Oxford Rd, Manchester M13 9PL, Lancs, England 5.Tokyo Inst Technol, Earth Life Sci Inst, Meguro Ku, Tokyo 1528550, Japan 6.Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA 7.Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA |
| 推荐引用方式 GB/T 7714 | Ma, Sizheng,Mao, Shude,Ida, Shigeru,et al. Free-floating planets from core accretion theory: microlensing predictions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,461(1):L107-L111. |
| APA | Ma, Sizheng,Mao, Shude,Ida, Shigeru,Zhu, Wei,&Lin, Douglas N. C..(2016).Free-floating planets from core accretion theory: microlensing predictions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,461(1),L107-L111. |
| MLA | Ma, Sizheng,et al."Free-floating planets from core accretion theory: microlensing predictions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 461.1(2016):L107-L111. |
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来源：国家天文台
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