KMT-2018-BLG-1988Lb: Microlensing super-Earth orbiting a low-mass disk dwarf

被引：8

作者：

Han, Cheongho ^{[1
]}

Gould, Andrew ^{[3
,4
]}

Albrow, Michael D. ^{[5
]}

Chung, Sun-Ju ^{[6
]}

Hwang, Kyu-Ha ^{[6
]}

Jung, Youn Kil ^{[6
]}

Kim, Doeon ^{[1
]}

Lee, Chung-Uk ^{[6
]}

Ryu, Yoon-Hyun ^{[6
]}

Shin, In-Gu ^{[6
]}

Shvartzvald, Yossi ^{[7
]}

Yee, Jennifer C. ^{[8
]}

Zang, Weicheng ^{[2
]}

Cha, Sang-Mok ^{[6
,9
]}

Kim, Dong-Jin ^{[6
]}

Kim, Hyoun-Woo ^{[6
]}

Kim, Seung-Lee ^{[6
]}

Lee, Dong-Joo ^{[6
]}

Lee, Yongseok ^{[6
]}

Park, Byeong-Gon ^{[6
]}

Pogge, Richard W. ^{[4
]}

Kim, Chun-Hwey ^{[10
]}

机构：

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

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

[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] Weizmanninst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel

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

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

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

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 658卷

基金：

新加坡国家研究基金会;

关键词：

gravitational lensing: micro; planets and satellites: detection; GRAVITATIONAL LENS; GALACTIC BULGE; PLANET; EVENTS; KMTNET; PHOTOMETRY; NETWORK; SYSTEMS; HOST;

D O I：

10.1051/0004-6361/202142077

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We reexamine high-magnification microlensing events in the previous data collected by the KMTNet survey with the aim of finding planetary signals that were not noticed before. In this work, we report the planetary system KMT-2018-BLG-1988L, which was found from this investigation. Methods. The planetary signal appears as a deviation with less than or similar to 0.2 mag from a single-lens light curve and lasted for about 6 h. The deviation exhibits a pattern of a dip surrounded by weak bumps on both sides of the dip. The analysis of the lensing light curve indicates that the signal is produced by a low-mass-ratio (q similar to 4 x 10(-5)) planetary companion located near the Einstein ring of the host star. Results. The mass of the planet, M-planet = 6.8(-3.5)(+4.7) M-circle plus ED and 5.6(-2.8)(+4.7) M-circle plus for the two possible solutions, estimated from the Bayesian analysis indicates that the planet is in the regime of a super-Earth. The host of the planet is a disk star with a mass of M-host = 0.47(-0.25)(+0.33) M-circle dot and a distance of D-L = 4.2(-14)(+1.8) kpc. KMT-2018-BLG-1988Lb is the 18th known microlensing planet with a mass below the upper limit of a super-Earth. The fact that 15 out of the 18 known microlensing planets with masses less than or similar to 10 M-circle plus were detected in the 5 yr following the full operation of the KMTNet survey indicates that the KMTNet database is an important reservoir of very low-mass planets.

引用

页数：8

共 27 条

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