Ryu, Yoon-Hyun and Hwang, Kyu-Ha and Gould, Andrew and Albrow, Michael D. and Chung, Sun-Ju and Han, Cheongho and Jung, Youn Kil and Shin, In-Gu and Shvartzvald, Yossi and Yee, Jennifer C. 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. (2019) KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-cadence Microlensing Field. Astronomical Journal, 158 (4). Art. No. 151. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20190920-135255305
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Abstract
We report the discovery of KMT-2018-BLG-1990Lb, a Jovian planet (m_p = 0.57^(+0.79)_(-0.25) M_J) orbiting a late M dwarf (M = 0.14^(+0.20)_(-0.06) M⊙) at a distance of (D_L = 1.23^(+1.06)_(-0.43) kpc, and projected at 2.6 ± 0.6 times the snow line distance, i.e., a_(snow) ≡ 2.7 au (M/M⊙). This is the second Jovian planet discovered by the Korea Microlensing Telescope Network (KMTNet) in its low-cadence (0.4 hr^(−1)) fields, demonstrating that this population can be probed based on relatively low-cadence survey-only microlensing data. However, while many Jovian-planet microlensing events will not have caustic crossings (e.g., the previous case, KMT-2016-BLG-1397) and some that do will be well characterized by low-cadence survey observations (e.g., the current case), in general higher-cadence follow-up observations of the caustic crossings are preferable. Such follow-up observations require microlensing alerts, which KMTNet now provides.
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| Additional Information: | © 2019 The American Astronomical Society. Received 2019 February 21; revised 2019 August 7; accepted 2019 August 8; published 2019 September 20. We thank the anonymous referee for an exceptionally helpful report. Work by A.G. was supported by AST-1516842 from the US NSF. I.G.S. and A.G. were supported by JPL grant 1500811. A.G. received support from the European Research Council under the European Unions Seventh Framework Programme (FP 7) ERC Grant Agreement No. [321035]. Work by C.H. was supported by the grant (2017R1A4A1015178) of National Research Foundation of Korea. 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. | ||||||||||||||||||||||||||
| Group: | Infrared Processing and Analysis Center (IPAC) | ||||||||||||||||||||||||||
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| Subject Keywords: | gravitational lensing: micro | ||||||||||||||||||||||||||
| Issue or Number: | 4 | ||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20190920-135255305 | ||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190920-135255305 | ||||||||||||||||||||||||||
| Official Citation: | Yoon-Hyun Ryu et al 2019 AJ 158 151 | ||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||
| ID Code: | 98779 | ||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||||||||||||||
| Deposited On: | 20 Sep 2019 23:02 | ||||||||||||||||||||||||||
| Last Modified: | 03 Oct 2019 21:44 |
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