OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event

被引：17

作者：

Han, Cheongho ^{[1
]}

Udalski, Andrzej ^{[2
]}

Gould, Andrew ^{[3
,4
]}

Albrow, Michael D. ^{[5
]}

Chung, Sun-Ju ^{[6
,7
]}

Hwang, Kyu-Ha ^{[6
]}

Jung, Youn Kil ^{[6
]}

Lee, Chung-Uk ^{[6
]}

Ryu, Yoon-Hyun ^{[6
]}

Shin, In-Gu ^{[6
]}

Shvartzvald, Yossi ^{[8
]}

Yee, Jennifer C. ^{[9
]}

Zang, Weicheng ^{[10
,11
]}

Cha, Sang-Mok ^{[6
,12
]}

Kim, Dong-Jin ^{[6
]}

Kim, Hyoun-Woo ^{[6
]}

Kim, Seung-Lee ^{[6
,7
]}

Lee, Dong-Joo ^{[6
]}

Lee, Yongseok ^{[6
,12
]}

Park, Byeong-Gon ^{[6
,7
]}

Pogge, Richard W. ^{[4
]}

Jee, M. James ^{[13
,14
]}

Kim, Doeon ^{[1
]}

Kim, Chun-Hwey ^{[15
]}

Kim, Woong-Tae ^{[16
]}

Mroz, Przemek ^{[2
,17
]}

Szymanski, Michal K. ^{[2
]}

Skowron, Jan ^{[2
]}

Poleski, Radek ^{[2
,4
]}

Soszynski, Igor ^{[2
]}

Pietrukowicz, Pawel ^{[2
]}

Kozlowski, Szymon ^{[2
]}

Ulaczyk, Krzysztof ^{[18
]}

机构：

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

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

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

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

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

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

[7] Korea Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea

[8] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel

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

[10] Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China

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

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

[13] Yonsei Univ, Dept Astron, Seoul, South Korea

[14] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[15] Chungbuk Natl Univ, Dept Astron & Space Sci, Cheongju 28644, South Korea

[16] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea

[17] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[18] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

来源：

ASTRONOMICAL JOURNAL | 2020年 / 159卷 / 03期

基金：

欧洲研究理事会; 新加坡国家研究基金会;

关键词：

Gravitational lensing; Gravitational microlensing exoplanet detection; MASS FUNCTION; PHOTOMETRY; STARS; SYSTEMS;

D O I：

10.3847/1538-3881/ab6a9f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the analysis of the microlensing event OGLE-2016-BLG-1227. The light curve of this short-duration event appears to be a single-lens event affected by severe finite-source effects. Analysis of the light curve based on a single-lens single-source (1L1S) model yields very small values of the event timescale, <CDATA<i days, and the angular Einstein radius, <CDATA<i mas, making the lens a candidate of a free-floating planet. Close inspection reveals that the 1L1S solution leaves small residuals with an amplitude of Delta I less than or similar to 0.03 mag. We find that the residuals are explained by the existence of an additional widely separated heavier lens component, indicating that the lens is a wide-separation planetary system rather than a free-floating planet. From Bayesian analysis, it is estimated that the planet has a mass of <CDATA<i and it is orbiting a low-mass host star with a mass of <CDATA<i located with a projected separation of <CDATA<i au. The planetary system is located in the Galactic bulge with a line-of-sight separation from the source star of CDATA<i kpc. The event shows that there is a range of deviations in the signatures of host stars for apparently isolated planetary lensing events and that it is possible to identify a host even when a deviation is subtle.

引用

页数：9

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