KMT-2019-BLG-0371 and the Limits of Bayesian Analysis
- Creators
- Kim, Yun Hak
- Chung, Sun-Ju
- Yee, Jennifer C.
- Udalski, A.
- Bond, Ian A.
- Jung, Youn Kil
- Gould, Andrew
- Albrow, Michael D.
- Han, Cheongho
- Hwang, Kyu-Ha
- Ryu, Yoon-Hyun
- Shin, In-Gu
- Shvartzvald, Yossi
- Zang, Weicheng
- Cha, Sang-Mok
- Kim, Dong-Jin
- Kim, Hyoun-Woo
- Kim, Seung-Lee
- Lee, Chung-Uk
- Lee, Dong-Joo
- Lee, Yongseok
- Park, Byeong-Gon
- Pogge, Richard W.
- Poleski, Radek
- Mróz, Przemek
- Skowron, Jan
- Szymański, Michal K.
- Soszyński, Igor
- Pietrukowicz, Pawel
- Kozłowski, Szymon
- Ulaczyk, Krzysztof
- Rybicki, Krzysztof A.
- Iwanek, Patryk
- Wrona, Marcin
- Gromadzki, Mariusz
- Abe, Fumio
- Barry, Richard
- Bennett, David P.
- Bhattacharya, Aparna
- Donachie, Martin
- Fujii, Hirosane
- Fukui, Akihiko
- Itow, Yoshitaka
- Hirao, Yuki
- Kirikawa, Rintaro
- Kondo, Iona
- Koshimoto, Naoki
- Matsubara, Yutaka
- Muraki, Yasushi
- Miyazaki, Shota
- Ranc, Clément
- Rattenbury, Nicholas J.
- Satoh, Yuki
- Shoji, Hikaru
- Sumi, Takahiro
- Suzuki, Daisuke
- Tristram, Paul J.
- Tanaka, Yuzuru
- Yamawaki, Tsubasa
- Yonehara, Atsunori
- KMTNet Collaboration
- OGLE Collaboration
- MOA Collaboration
Abstract
We show that the perturbation at the peak of the light curve of microlensing event KMT-2019-BLG-0371 is explained by a model with a mass ratio between the host star and planet of q ~ 0.08. Due to the short event duration (t_E ~ 6.5 days), the secondary object in this system could potentially be a massive giant planet. A Bayesian analysis shows that the system most likely consists of a host star with a mass M_h = 0.09_(-0.05)^(+0.14) M_⊙ and a massive giant planet with a mass M_p = 7.70_(-3.90)^(+11.34) M_(Jup). However, the interpretation of the secondary as a planet (i.e., as having M_p < 13 M_(Jup)) rests entirely on the Bayesian analysis. Motivated by this event, we conduct an investigation to determine which constraints meaningfully affect Bayesian analyses for microlensing events. We find that the masses inferred from such a Bayesian analysis are determined almost entirely by the measured value of θ_E and are relatively insensitive to other factors such as the direction of the event (ℓ, b), the lens–source relative proper motion μ_(rel), or the specific Galactic model prior.
Additional Information
© 2021. The American Astronomical Society. Received 2021 January 12; revised 2021 April 7; accepted 2021 April 15; published 2021 June 15. Work by Y.H.K. was supported by the KASI (Korea Astronomy and Space Science Institute) grant 2021-1-830-08. 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. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. The MOA project was supported by JSPS KAKENHI grant Nos. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, JP17H02871, and JP16H06287. Work by C.H. was supported by the grants of the National Research Foundation of Korea (2019R1A2C2085965 and 2020R1A4A2002885).Attached Files
Published - Kim_2021_AJ_162_17.pdf
Submitted - 2101.12206.pdf
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Additional details
- Eprint ID
- 109590
- Resolver ID
- CaltechAUTHORS:20210626-183434308
- 2021-1-830-08
- Korea Astronomy and Space Science Institute (KASI)
- 2014/14/A/ST9/00121
- National Science Centre (Poland)
- JSPS24253004
- Japan Society for the Promotion of Science (JSPS)
- JSPS26247023
- Japan Society for the Promotion of Science (JSPS)
- JSPS23340064
- Japan Society for the Promotion of Science (JSPS)
- JSPS15H00781
- Japan Society for the Promotion of Science (JSPS)
- JP17H02871
- Japan Society for the Promotion of Science (JSPS)
- JP16H06287
- Japan Society for the Promotion of Science (JSPS)
- 2019R1A2C2085965
- National Research Foundation of Korea
- 2020R1A4A2002885
- National Research Foundation of Korea
- Created
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2021-06-28Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field