KMT-2017-BLG-0673Lb and KMT-2019-BLG-0414Lb: Two microlensing planets detected in peripheral fields of KMTNet survey

被引：4
作者：
Han, Cheongho [1 ]
Lee, Chung-Uk [2 ]
Gould, Andrew [3 ,4 ]
Jung, Youn Kil [2 ]
Albrow, Michael D. [5 ]
Chung, Sun-Ju [2 ]
Hwang, Kyu-Ha [2 ]
Kim, Doeon [1 ]
Ryu, Yoon-Hyun [2 ]
Shin, In-Gu [6 ]
Shvartzvald, Yossi [7 ]
Yang, Hongjing [8 ]
Yee, Jennifer C. [6 ]
Zang, Weicheng [8 ]
Cha, Sang-Mok [2 ,9 ]
Kim, Dong-Jin [2 ]
Kim, Seung-Lee [2 ]
Lee, Dong-Joo [2 ]
Lee, Yongseok [2 ]
Park, Byeong-Gon [2 ]
Pogge, Richard W. [4 ]
机构：
[1] Chungbuk Natl Univ, Dept Phys, Cheongju 28644, South Korea
[2] Korea Astron & Space Sci Inst, Daejon 34055, South Korea
[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] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
[7] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel
[8] Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China
[9] Kyung Hee Univ, Sch Space Res, Yongin 17104, Kyeonggi, South Korea
来源：
ASTRONOMY & ASTROPHYSICS | 2022年 / 666卷
基金：
新加坡国家研究基金会; 美国国家科学基金会;
关键词：
planets and satellites: detection; gravitational lensing: micro; GALACTIC BULGE; ANOMALY SEARCH; BINARY-SOURCE; MASS; NETWORK; EVENTS; DWARF; PHOTOMETRY; SYSTEMS; STARS;
D O I：
10.1051/0004-6361/202244438
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Aims. We investigate the microlensing data collected during the 2017-2019 seasons in the peripheral Galactic bulge fields with the aim of finding planetary signals in microlensing light curves observed with relatively sparse coverage. Methods. We first sort out lensing events with weak short-term anomalies in the lensing light curves from the visual inspection of all non-prime-field events, and then test various interpretations of the anomalies. From this procedure, we find two previously unidentified candidate planetary lensing events KMT-2017-BLG-0673 and KMT-2019-BLG-0414. It is found that the planetary signal of KMT-2017-BLG-0673 was produced by the source crossing over a planet-induced caustic, but it was previously missed because of the sparse coverage of the signal. On the other hand, the possibly planetary signal of KMT-2019-BLG-0414 was generated without caustic crossing, and it was previously missed due to the weakness of the signal. We identify a unique planetary solution for KMT-2017-BLG-0673. However, for KMT-2019-BLG-0414, we identify two pairs of planetary solutions, for each of which there are two solutions caused by the close-wide degeneracy, and a slightly less favored binary-source solution, in which a single lens mass gravitationally magnified a rapidly orbiting binary source with a faint companion (xallarap). Results. From Bayesian analyses, it is estimated that the planet KMT-2017-BLG-0673Lb has a mass of 3.7(-2.1)(+2.)(2) M-J, and it is orbiting a late K-type host star with a mass of 0.63(-0.35)(+0.37) M-circle dot. Under the planetary interpretation of KMT-2010-BLG-0414L, a star with a mass of 0.74(-0.38)(+0.43) M-circle dot hosts a planet with a mass of similar to 3.2-3.6 M-J depending on the solution. We discuss the possible resolution of the planet-xallarap degeneracy of KMT-2019-BLG-0414 by future adaptive-optics observations on 30 m class telescopes. The detections of the planets indicate the need for thorough investigations of non-prime-field lensing events for the complete census of microlensing planet samples.
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页数：9
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