Predictions of the WFIRST Microlensing Survey. I. Bound Planet Detection Rates
文献类型：期刊论文
| 作者 | Penny,Matthew T.2; Scott Gaudi,B.2; Kerins,Eamonn3; Rattenbury,Nicholas J.4; Mao,Shude3,5,6 ; Robin,Annie C.7; Calchi Novati,Sebastiano1
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| 刊名 | The Astrophysical Journal Supplement Series
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| 出版日期 | 2019-02-25 |
| 卷号 | 241期号:1 |
| 关键词 | gravitational lensing: micro planets and satellites: detection space vehicles: instruments |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/aafb69 |
| 英文摘要 | Abstract The Wide Field InfraRed Survey Telescope (WFIRST) is the next NASA astrophysics flagship mission, to follow the James Webb Space Telescope. The WFIRST mission was chosen as the top-priority large space mission of the 2010 astronomy and astrophysics decadal survey in order to achieve three primary goals: to study dark energy via a wide-field imaging survey, to study exoplanets via a microlensing survey, and to enable a guest observer program. Here we assess the ability of the several WFIRST designs to achieve the goal of the microlensing survey to discover a large sample of cold, low-mass exoplanets with semimajor axes beyond roughly one astronomical unit, which are largely impossible to detect with any other technique. We present the results of a suite of simulations that span the full range of the proposed WFIRST architectures, from the original design envisioned by the decadal survey, to the current design, which utilizes a 2.4 m telescope donated to NASA. By studying such a broad range of architectures, we are able to determine the impact of design trades on the expected yields of detected exoplanets. In estimating the yields we take particular care to ensure that our assumed Galactic model predicts microlensing event rates that match observations, consider the impact that inaccuracies in the Galactic model might have on the yields, and ensure that numerical errors in light-curve computations do not bias the yields for the smallest-mass exoplanets. For the nominal baseline WFIRST design and a fiducial planet mass function, we predict that a total of ～1400 bound exoplanets with mass greater than ～0.1 M⊕ should be detected, including ～200 with mass ?3 M⊕. WFIRST should have sensitivity to planets with mass down to ～0.02 M⊕, or roughly the mass of Ganymede. |
| 语种 | 英语 |
| WOS记录号 | IOP:0067-0049-241-1-AAFB69 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/25104]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.IPAC, Mail Code 100-22, Caltech, 1200 East California Boulevard, Pasadena, CA 91125, USA 2.Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA 3.Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester, Manchester M13 9PL, UK 4.Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand 5.Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People's Republic of China 6.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, People's Republic of China 7.Institut Utinam, CNRS UMR 6213, OSU THETA, Université Bourgogne-Franche-Comté, 41bis avenue de l’Observatoire, F-25000 Besan?on, France |
| 推荐引用方式 GB/T 7714 | Penny,Matthew T.,Scott Gaudi,B.,Kerins,Eamonn,et al. Predictions of the WFIRST Microlensing Survey. I. Bound Planet Detection Rates[J]. The Astrophysical Journal Supplement Series,2019,241(1). |
| APA | Penny,Matthew T..,Scott Gaudi,B..,Kerins,Eamonn.,Rattenbury,Nicholas J..,Mao,Shude.,...&Calchi Novati,Sebastiano.(2019).Predictions of the WFIRST Microlensing Survey. I. Bound Planet Detection Rates.The Astrophysical Journal Supplement Series,241(1). |
| MLA | Penny,Matthew T.,et al."Predictions of the WFIRST Microlensing Survey. I. Bound Planet Detection Rates".The Astrophysical Journal Supplement Series 241.1(2019). |
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来源：国家天文台
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