Systematic KMTNet Planetary Anomaly Search. I. OGLE-2019-BLG-1053Lb, a Buried Terrestrial Planet

被引：39

作者：

Zang, Weicheng ^{[1
]}

Hwang, Kyu-Ha ^{[2
]}

Udalski, Andrzej ^{[3
]}

Wang, Tianshu ^{[4
]}

Zhu, Wei ^{[1
]}

Sumi, Takahiro ^{[5
]}

Yee, Jennifer C. ^{[6
]}

Gould, Andrew ^{[7
,8
]}

Mao, Shude ^{[1
,9
]}

Zhang, Xiangyu ^{[1
]}

Albrow, Michael D. ^{[10
]}

Chung, Sun-Ju ^{[2
,11
]}

Han, Cheongho ^{[12
]}

Jung, Youn Kil ^{[2
]}

Ryu, Yoon-Hyun ^{[2
]}

Shin, In-Gu ^{[2
]}

Shvartzvald, Yossi ^{[13
]}

Cha, Sang-Mok ^{[2
,14
]}

Kim, Dong-Jin ^{[2
]}

Kim, Hyoun-Woo ^{[2
]}

Kim, Seung-Lee ^{[2
,11
]}

Lee, Chung-Uk ^{[2
]}

Lee, Dong-Joo ^{[2
]}

Lee, Yongseok ^{[2
,14
]}

Park, Byeong-Gon ^{[2
,11
]}

Pogge, Richard W. ^{[8
]}

Mroz, Przemek ^{[3
,15
]}

Skowron, Jan ^{[3
]}

Poleski, Radoslaw ^{[3
]}

Szymanski, Michal K. ^{[3
]}

Soszynski, Igor ^{[3
]}

Pietrukowicz, Pawel ^{[3
]}

Kozlowski, Szymon ^{[3
]}

Ulaczyk, Krzysztof ^{[16
]}

Rybicki, Krzysztof A. ^{[3
]}

Iwanek, Patryk ^{[3
]}

Wrona, Marcin ^{[3
]}

Gromadzki, Mariusz ^{[3
]}

Bond, Ian A. ^{[17
]}

Abe, Fumio ^{[18
]}

Barry, Richard ^{[19
]}

Bennett, David P. ^{[19
,20
]}

Bhattacharya, Aparna ^{[19
,20
]}

Donachie, Martin ^{[21
]}

Fujii, Hirosane ^{[5
]}

Fukui, Akihiko ^{[22
,23
]}

Hirao, Yuki ^{[5
]}

Itow, Yoshitaka ^{[18
]}

Kirikawa, Rintaro ^{[5
]}

Kondo, Iona ^{[5
]}

机构：

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

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

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

[4] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[26] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA

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

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

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

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

[31] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

来源：

ASTRONOMICAL JOURNAL | 2021年 / 162卷 / 04期

基金：

新加坡国家研究基金会; 美国国家航空航天局; 美国国家科学基金会;

关键词：

GRAVITATIONAL LENSING EXPERIMENT; SATURN-MASS PLANET; MICROLENSING EVENTS; JUPITER/SATURN ANALOG; SNOW LINE; M-DWARF; PARALLAX; SPITZER; STARS; PHOTOMETRY;

D O I：

10.3847/1538-3881/ac12d4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In order to exhume the buried signatures of "missing planetary caustics" in Korea Microlensing Telescope Network (KMTNet) data, we conducted a systematic anomaly search of the residuals from point-source point-lens fits, based on a modified version of the KMTNet EventFinder algorithm. This search revealed the lowest-mass-ratio planetary caustic to date in the microlensing event OGLE-2019-BLG-1053, for which the planetary signal had not been noticed before. The planetary system has a planet-host mass ratio of q = (1.25 +/- 0.13) x 10(-5). A Bayesian analysis yielded estimates of the mass of the host star, M-host = 0.61(-0.24)(+0.29)M(circle dot), the mass of its planet, M-planet = 2.48(-0.98)(+1.19)M(circle plus), the projected planet-host separation, a(perpendicular to)= 3.4(-0.5)(+0.5) au, and the lens distance, D-L = 6.8(-0.9)(+0.6) kpc. The discovery of this very-low-mass-ratio planet illustrates the utility of our method and opens a new window for a large and homogeneous sample to study the microlensing planet-host mass ratio function down to q similar to 10(-5).

引用

页数：18

共 10 条

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