Systematic KMTNet Planetary Anomaly Search. II. Six New q < 2 x 10-4 Mass-ratio Planets

被引：40

作者：

Hwang, Kyu-Ha ^{[1
]}

Zang, Weicheng ^{[2
,3
]}

Gould, Andrew ^{[4
,5
]}

Udalski, Andrzej ^{[6
]}

Bond, Ian A. ^{[7
]}

Yang, Hongjing ^{[2
,3
]}

Mao, Shude ^{[2
,3
,8
]}

Albrow, Michael D. ^{[9
]}

Chung, Sun-Ju ^{[1
,10
]}

Han, Cheongho ^{[11
]}

Jung, Youn Kil ^{[1
]}

Ryu, Yoon-Hyun ^{[1
]}

Shin, In-Gu ^{[1
]}

Shvartzvald, Yossi ^{[12
]}

Yee, Jennifer C. ^{[13
]}

Cha, Sang-Mok ^{[1
,14
]}

Kim, Dong-Jin ^{[1
]}

Kim, Hyoun-Woo ^{[1
]}

Kim, Seung-Lee ^{[1
,10
]}

Lee, Chung-Uk ^{[1
,10
]}

Lee, Dong-Joo ^{[1
]}

Lee, Yongseok ^{[1
,14
]}

Park, Byeong-Gon ^{[1
,10
]}

Pogge, Richard W. ^{[5
]}

Mroz, Przemek ^{[15
]}

Poleski, Radek ^{[5
,6
]}

Skowron, Jan ^{[6
]}

Szymanski, Michal K. ^{[6
]}

Soszynski, Igor ^{[6
]}

Pietrukowicz, Pawel ^{[6
]}

Kozlowski, Szymon ^{[6
]}

Ulaczyk, Krzysztof ^{[16
]}

Rybicki, Krzysztof A. ^{[6
]}

Iwanek, Patryk ^{[6
]}

Wrona, Marcin ^{[6
]}

Gromadzki, Mariusz ^{[6
]}

Abe, Fumio ^{[17
]}

Barry, Richard ^{[18
]}

Bennett, David P. ^{[18
,19
]}

Bhattacharya, Aparna ^{[18
,19
]}

Fujii, Hirosame ^{[17
]}

Fukui, Akihiko ^{[20
,21
]}

Hirao, Yuki ^{[22
]}

Itow, Yoshitaka ^{[17
]}

Kirikawa, Rintaro ^{[22
]}

Kondo, Iona ^{[22
]}

Koshimoto, Naoki ^{[23
,24
]}

Munford, Brandon ^{[25
]}

Matsubara, Yutaka ^{[17
]}

Miyazaki, Shota ^{[22
]}

机构：

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[26] Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR 7095, 98 Bis Bd Arago, F-75014 Paris, France

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

[28] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2525210, Japan

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

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

[31] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[32] CFHT Corp, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743 USA

[33] Univ Toulouse, IRAP, UPS OMP, Toulouse, France

来源：

ASTRONOMICAL JOURNAL | 2022年 / 163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 EXPERIMENT; MICROLENSING EVENTS; COLD NEPTUNE; SNOW LINE; PARALLAX; PHOTOMETRY; DISCOVERY; FREQUENCY; ALGORITHM; NETWORK;

D O I：

10.3847/1538-3881/ac38ad

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We apply the automated AnomalyFinder algorithm of Paper I to 2018-2019 light curves from the similar or equal to 13 deg(2) covered by the six KMTNet prime fields, with cadences Gamma >= 2 hr(-1). We find a total of 11 planets with mass ratios q < 2 x 10(-4), including 6 newly discovered planets, 1 planet that was reported in Paper I, and recovery of 4 previously discovered planets. One of the new planets, OGLE-2018-BLG-0977Lb, is in a planetary caustic event, while the other five (OGLE-2018-BLG-0506Lb, OGLE-2018-BLG-0516Lb, OGLE-2019-BLG-1492Lb, KMT-2019-BLG-0253, and KMT-2019-BLG-0953) are revealed by a "dip" in the light curve as the source crosses the host-planet axis on the opposite side of the planet. These subtle signals were missed in previous by-eye searches. The planet-host separations (scaled to the Einstein radius), s, and planet-host mass ratios, q, are, respectively, (s, q x 10(5)) = (0.88, 4.1), (0.96 +/- 0.10, 8.3), (0.94 +/- 0.07, 13), (0.97 +/- 0.07, 18), (0.97 +/- 0.04, 4.1), and (0.74, 18), where the " +/- " indicates a discrete degeneracy. The 11 planets are spread out over the range -5<logq<-3.7 q similar to 10(-5) from the 2018-2019 nonprime KMT fields, this result suggests that planets toward the bottom of this mass-ratio range may be more common than previously believed.

引用

页数：26

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Systematic KMTNet Planetary Anomaly Search. II. Six New q &lt; 2 x 10-4 Mass-ratio Planets

Systematic KMTNet Planetary Anomaly Search. II. Six New q < 2 x 10-4 Mass-ratio Planets