Two new free-floating or wide-orbit planets from microlensing

被引：42

作者：

Mroz, Przemek ^{[1
]}

Udalski, Andrzej ^{[1
]}

Bennett, David P. ^{[2
,3
]}

Ryu, Yoon-Hyun ^{[4
]}

Sumi, Takahiro ^{[5
]}

Shvartzvald, Yossi ^{[6
]}

Skowron, Jan ^{[1
]}

Poleski, Radoslaw ^{[1
,7
]}

Pietrukowicz, Pawel ^{[1
]}

Kozlowski, Szymon ^{[1
]}

Szymanski, Michal K. ^{[1
]}

Wyrzykowski, Lukasz ^{[1
]}

Soszynski, Igor ^{[1
]}

Ulaczyk, Krzysztof ^{[1
,8
]}

Rybicki, Krzysztof ^{[1
]}

Iwanek, Patryk ^{[1
]}

Albrow, Michael D. ^{[9
]}

Chung, Sun-Ju ^{[4
,10
]}

Gould, Andrew ^{[4
,7
,11
]}

Han, Cheongho ^{[12
]}

Hwang, Kyu-Ha ^{[4
]}

Jung, Youn Kil ^{[4
]}

Shin, In-Gu ^{[13
]}

Yee, Jennifer C. ^{[13
]}

Zang, Weicheng ^{[14
,15
]}

Cha, Sang-Mok ^{[4
,16
]}

Kim, Dong-Jin ^{[4
]}

Kim, Hyoun-Woo ^{[4
]}

Kim, Seung-Lee ^{[4
,10
]}

Lee, Chung-Uk ^{[4
,10
]}

Lee, Dong-Joo ^{[4
]}

Lee, Yongseok ^{[4
,16
]}

Park, Byeong-Gon ^{[4
,10
]}

Pogge, Richard W. ^{[7
]}

Abe, Fumio ^{[17
]}

Barry, Richard ^{[2
]}

Bhattacharya, Aparna ^{[2
,3
]}

Bond, Ian A. ^{[18
]}

Donachie, Martin ^{[19
]}

Fukui, Akihiko ^{[20
,21
]}

Hirao, Yuki ^{[3
,5
]}

Itow, Yoshitaka ^{[17
]}

Kawasaki, Kohei ^{[5
]}

Kondo, Iona ^{[5
]}

Koshimoto, Naoki ^{[22
,23
]}

Li, Man Cheung Alex ^{[19
]}

Matsubara, Yutaka ^{[17
]}

Muraki, Yasushi ^{[17
]}

Miyazaki, Shota ^{[5
]}

Nagakane, Masayuki ^{[5
]}

机构：

[1] Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland

[2] NASA, Goddard Space Flight Ctr, Code 667, Greenbelt, MD 20771 USA

[3] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[4] Korea Astron & Space Sci Inst, Daejon 34055, South Korea

[5] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan

[6] IPAC, Mail Code 100-22,1200 E Calif Blvd, Pasadena, CA 91125 USA

[7] Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA

[8] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[9] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch 8020, New Zealand

[10] Korea Univ Sci & Technol, Daejeon 34113, South Korea

[11] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[12] Chungbuk Natl Univ, Dept Phys, Cheongju 28644, South Korea

[13] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[14] Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China

[15] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China

[16] Kyung Hee Univ, Sch Space Res, Yongin 17104, Kyeonggi, South Korea

[17] Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi 4648601, Japan

[18] Massey Univ, Inst Nat & Math Sci, Auckland 0745, New Zealand

[19] Univ Auckland, Dept Phys, Private Bag 92019, Auckland, New Zealand

[20] Univ Tokyo, Dept Earth & Planetary Sci, Grad Sch Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[21] Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38205, Spain

[22] Univ Tokyo, Dept Astron, Grad Sch Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[23] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[24] Victoria Univ, Sch Chem & Phys Sci, Wellington, New Zealand

[25] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan

[26] Univ Canterbury, Mt John Observ, POB 56, Lake Tekapo 8770, New Zealand

[27] Kyoto Sangyo Univ, Dept Phys, Fac Sci, Kyoto 6038555, Japan

[28] Tel Aviv Univ, Sch Phys & Astron, IL-6997801 Tel Aviv, Israel

[29] Tel Aviv Univ, Wise Observ, IL-6997801 Tel Aviv, Israel

来源：

ASTRONOMY & ASTROPHYSICS | 2019年 / 622卷

基金：

以色列科学基金会; 新加坡国家研究基金会; 欧洲研究理事会;

关键词：

planets and satellites: detection; gravitational lensing: micro; COLOR-TEMPERATURE RELATIONS; MASS FUNCTION; MINIMUM MASS; SYSTEMS; JUPITER; NEPTUNE; CALIBRATION; EXOPLANETS; CLUSTERS; ESCAPE;

D O I：

10.1051/0004-6361/201834557

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales t(E) (typically below two days) and small angular Einstein radii theta(E) (up to several mu as). Here we present the discovery and characterization of two ultra-short microlensing events identified in data from the Optical Gravitational Lensing Experiment (OGLE) survey, which may have been caused by free-floating or wide-orbit planets. OGLE-2012-BLG-1323 is one of the shortest events discovered thus far (t(E) = 0. 155 +/- 0. 005 d, theta(E) = 2. 37 +/- 0. 10 mu as) and was caused by an Earth-mass object in the Galactic disk or a Neptune-mass planet in the Galactic bulge. OGLE-2017-BLG-0560 (t(E) = 0. 905 +/- 0. 005 d, theta(E) = 38. 7 +/- 1. 6 mu as) was caused by a Jupiter-mass planet in the Galactic disk or a brown dwarf in the bulge. We rule out stellar companions up to a distance of 6.0 and 3.9 au, respectively. We suggest that the lensing objects, whether located on very wide orbits or free-floating, may originate from the same physical mechanism. Although the sample of ultra-short microlensing events is small, these detections are consistent with low-mass wide-orbit or unbound planets being more common than stars in the Milky Way.

引用

页数：8

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