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OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through the Planetary-caustic Channel

Kil Jung, Youn and Han, Cheongho and Udalski, Andrzej and Gould, Andrew and Yee, Jennifer C. and Albrow, Michael D. and Chung, Sun-Ju and Hwang, Kyu-Ha and Ryu, Yoon-Hyun and Shin, In-Gu and Shvartzvald, Yossi and Zhu, Wei and Zang, Weicheng and Cha, Sang-Mok and Kim, Dong-Jin and Kim, Hyoun-Woo and Kim, Seung-Lee and Lee, Chung-Uk and Lee, Dong-Joo and Lee, Yongseok and Park, Byeong-Gon and Pogge, Richard W. and Mróz, Przemek and Szymański, Michał K. and Skowron, Jan and Poleski, Radek and Soszyński, Igor and Pietrukowicz, Paweł and Kozłowski, Szymon and Ulaczyk, Krzystof and Rybicki, Krzysztof A. and Iwanek, Patryk and Wrona, Marcin (2021) OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through the Planetary-caustic Channel. Astronomical Journal, 161 (6). Art. No. 293. ISSN 0004-6256. https://resolver.caltech.edu/CaltechAUTHORS:20210604-111534460

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Abstract

We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely and continuously covered by two high-cadence surveys. The light-curve modeling indicates that the anomalies are generated by source crossings over the planetary caustics induced by planetary companions to the hosts. The estimated planet/host separation (scaled to the angular Einstein radius θE) and mass ratio are (s, q × 10³) = (1.81 ± 0.02, 1.24 ± 0.07) and (s, q × 10³) = (1.25 ± 0.03, 2.38 ± 0.08), respectively. From Bayesian analyses, we estimate the host and planet masses as (M_h, M_p) = 0.25_(-0.13)^(+0.27) M_⊙, 0.32_(-0.17)^(+0.34) M_J) and (M_h, M_p) = (0.54_(-0.28)^(+0.33) M_⊙, 1.34_(-0.70)^(+0.82) M_J), respectively. These planetary systems are located at a distance of 7.06_(-1.15)^(+0.93) kpc for OGLE-2018-BLG-0567 and 6.50_(-1.75)^(+1.06) kpc for OGLE-2018-BLG-0962, suggesting that they are likely to be near the Galactic bulge. The two events prove the capability of current high-cadence surveys for finding planets through the planetary-caustic channel. We find that most published planetary-caustic planets are found in Hollywood events in which the source size strongly contributes to the anomaly cross-section relative to the size of the caustic.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/abf8bdDOIArticle
https://arxiv.org/abs/2102.07338arXivDiscussion Paper
ORCID:
AuthorORCID
Kil Jung, Youn0000-0002-0314-6000
Han, Cheongho0000-0002-2641-9964
Udalski, Andrzej0000-0001-5207-5619
Yee, Jennifer C.0000-0001-9481-7123
Albrow, Michael D.0000-0003-3316-4012
Chung, Sun-Ju0000-0001-6285-4528
Hwang, Kyu-Ha0000-0002-9241-4117
Ryu, Yoon-Hyun0000-0001-9823-2907
Shin, In-Gu0000-0002-4355-9838
Shvartzvald, Yossi0000-0003-1525-5041
Zhu, Wei0000-0003-4027-4711
Zang, Weicheng0000-0001-6000-3463
Cha, Sang-Mok0000-0002-7511-2950
Kim, Dong-Jin0000-0002-7038-2118
Kim, Hyoun-Woo0000-0001-8263-1006
Kim, Seung-Lee0000-0003-0562-5643
Lee, Chung-Uk0000-0003-0043-3925
Lee, Yongseok0000-0001-7594-8072
Park, Byeong-Gon0000-0002-6982-7722
Pogge, Richard W.0000-0003-1435-3053
Mróz, Przemek0000-0001-7016-1692
Szymański, Michał K.0000-0002-0548-8995
Skowron, Jan0000-0002-2335-1730
Poleski, Radek0000-0002-9245-6368
Soszyński, Igor0000-0002-7777-0842
Pietrukowicz, Paweł0000-0002-2339-5899
Kozłowski, Szymon0000-0003-4084-880X
Ulaczyk, Krzystof0000-0001-6364-408X
Rybicki, Krzysztof A.0000-0002-9326-9329
Iwanek, Patryk0000-0002-6212-7221
Wrona, Marcin0000-0002-3051-274X
Additional Information:© 2021. The American Astronomical Society. Received 2021 January 31; revised 2021 March 23; accepted 2021 April 14; published 2021 June 3. This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. Work by C.H. was supported by the grants of National Research Foundation of Korea (2017R1A4A1015178 and 2019R1A2C2085965). The OGLE has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U.
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea2017R1A4A1015178
National Research Foundation of Korea2019R1A2C2085965
National Science Centre (Poland)2014/14/A/ST9/00121
Subject Keywords:Gravitational microlensing; Gravitational microlensing exoplanet detection
Issue or Number:6
Classification Code:Unified Astronomy Thesaurus concepts: Gravitational microlensing (672); Gravitational microlensing exoplanet detection (2147)
Record Number:CaltechAUTHORS:20210604-111534460
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210604-111534460
Official Citation:Youn Kil Jung et al 2021 AJ 161 293
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109381
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Jun 2021 15:13
Last Modified:07 Jun 2021 15:23

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