Systematic Korea Microlensing Telescope Network planetary anomaly search - III. One wide-orbit planet and two stellar binaries

被引：23

作者：

Wang, Hanyue ^{[1
,2
]}

Zang, Weicheng ^{[1
]}

Zhu, Wei ^{[1
]}

Hwang, Kyu-Ha ^{[3
]}

Udalski, Andrzej ^{[4
]}

Gould, Andrew ^{[5
,6
]}

Han, Cheongho ^{[7
]}

Albrow, Michael D. ^{[8
]}

Chung, Sun-Ju ^{[3
,9
]}

Jung, Youn Kil ^{[3
]}

Kim, Doeon ^{[7
]}

Ryu, Yoon-Hyun ^{[3
]}

Shin, In-Gu ^{[3
]}

Shvartzvald, Yossi ^{[10
]}

Yee, Jennifer C. ^{[11
]}

Cha, Sang-Mok ^{[3
,12
]}

Kim, Dong-Jin ^{[3
]}

Kim, Hyoun-Woo ^{[3
]}

Kim, Seung-Lee ^{[3
,9
]}

Lee, Chung-Uk ^{[3
]}

Lee, Dong-Joo ^{[3
]}

Lee, Yongseok ^{[3
,12
]}

Park, Byeong-Gon ^{[3
,9
]}

Pogge, Richard W. ^{[6
]}

Poleski, Radoslaw ^{[4
]}

Mroz, Przemek ^{[4
,13
]}

Skowron, Jan ^{[4
]}

Szymanski, Michal K. ^{[4
]}

Soszynski, Igor ^{[4
]}

Pietrukowicz, Pawel ^{[4
]}

Kozlowski, Szymon ^{[4
]}

Ulaczyk, Krzysztof ^{[14
]}

Rybicki, Krzysztof A. ^{[4
]}

Iwanek, Patryk ^{[4
]}

Wrona, Marcin ^{[4
]}

Gromadzki, Mariusz ^{[4
]}

Yang, Hongjing ^{[1
]}

Mao, Shude ^{[1
,15
]}

Zhang, Xiangyu ^{[1
]}

机构：

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

[2] Harvard Univ, Harvard Coll, Cambridge, MA 02138 USA

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

[4] Univ Warsaw, Astron Observ, Aleje Ujazdowskie 4, PL-00478 Warsaw, Poland

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

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

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

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

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

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

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

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

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

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

[15] Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 510卷 / 02期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

gravitational lensing: micro; planets and satellites: detection; techniques: photometric; GRAVITATIONAL LENSING EXPERIMENT; MASS; STARS; PHOTOMETRY; EVENTS; ALGORITHM; THEOREM; KMTNET; DWARF; BULGE;

D O I：

10.1093/mnras/stab3581

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Only a few wide-orbit planets around old stars have been detected, which limits our statistical understanding of this planet population. Following the systematic search for planetary anomalies in microlensing events found by the Korea Microlensing Telescope Network, we present the discovery and analysis of three events that were initially thought to contain wide-orbit planets. The anomalous feature in the light curve of OGLE-2018-BLG-0383 is caused by a planet with mass ratio q = 2.1 x10(-4) and a projected separation s = 2.45. This makes it the lowest mass-ratio microlensing planet at such wide orbits. The other two events, KMT-2018-BLG-0998 and OGLE-2018-BLG-0271, are shown to be stellar binaries (q > 0.1) with rather close (s < 1) separations. We briefly discuss the properties of known wide-orbit microlensing planets and show that the survey observations are crucial in discovering and further statistically constraining such a planet population.

引用

页码：1778 / 1790

页数：13

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