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OGLE-2018-BLG-0799Lb: a q ∼ 2.7 × 10⁻³ planet with Spitzer parallax

Zang, Weicheng and Shvartzvald, Yossi and Udalski, Andrzej and Yee, Jennifer C. and Lee, Chung-Uk and Sumi, Takahiro and Zhang, Xiangyu and Yang, Hongjing and Mao, Shude and Calchi Novati, Sebastiano and Gould, Andrew and Zhu, Wei and Beichman, Charles A. and Bryden, Geoffery and Carey, Sean and Gaudi, B. Scott and Henderson, Calen B. and Mróz, Przemek and Skowron, Jan and Poleski, Radoslaw and Szymański, Michał K. and Soszyński, Igor and Pietrukowicz, Paweł and Kozłowski, Szymon and Ulaczyk, Krzysztof and Rybicki, Krzysztof A. and Iwanek, Patryk and Wrona, Marcin and Albrow, Michael D. and Chung, Sun-Ju and Han, Cheongho and Hwang, Kyu-Ha and Jung, Youn Kil and Ryu, Yoon-Hyun and Shin, In-Gu and Cha, Sang-Mok and Kim, Dong-Jin and Kim, Hyoun-Woo and Kim, Seung-Lee and Lee, Dong-Joo and Lee, Yongseok and Park, Byeong-Gon and Pogge, Richard W. and Bond, Ian A. and Abe, Fumio and Barry, Richard and Bennett, David P. and Bhattacharya, Aparna and Donachie, Martin and Fujii, Hirosane and Fukui, Akihiko and Hirao, Yuki and Itow, Yoshitaka and Kirikawa, Rintaro and Kondo, Iona and Koshimoto, Naoki and Li, Man Cheung Alex and Matsubara, Yutaka and Muraki, Yasushi and Miyazaki, Shota and Ranc, Clément and Rattenbury, Nicholas J. and Satoh, Yuki and Shoji, Hikaru and Suzuki, Daisuke and Tanaka, Yuzuru and Tristram, Paul J. and Yamawaki, Tsubasa and Yonehara, Atsunori and Bachelet, Etienne and Hundertmark, Markus P. G. and Figuera Jaimes, R. and Maoz, Dan and Penny, Matthew T. and Street, Rachel A. and Tsapras, Yiannis (2022) OGLE-2018-BLG-0799Lb: a q ∼ 2.7 × 10⁻³ planet with Spitzer parallax. Monthly Notices of the Royal Astronomical Society, 514 (4). pp. 5952-5968. ISSN 0035-8711. doi:10.1093/mnras/stac1631.

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We report the discovery and analysis of a planet in the microlensing event OGLE-2018-BLG-0799. The planetary signal was observed by several ground-based telescopes, and the planet-host mass ratio is q = (2.65 ± 0.16) × 10⁻³. The ground-based observations yield a constraint on the angular Einstein radius θ_E, and the microlensing parallax vector π_E⁠, is strongly constrained by the Spitzer data. However, the 2019 Spitzer baseline data reveal systematics in the Spitzer photometry, so there is ambiguity in the magnitude of the parallax. In our preferred interpretation, a full Bayesian analysis using a Galactic model indicates that the planetary system is composed of an M_(planet) = 0.26^(+0.22)_(−0.11)M_J planet orbiting an M_(host) = 0.093^(+0.082)_(−0.038) M⊙⁠, at a distance of D_L = 3.71^(+3.24)_(−1.70) kpc. An alternate interpretation of the data shifts the localization of the minima along the arc-shaped microlens parallax constraints. This, in turn, yields a more massive host with median mass of 0.13M⊙ at a distance of 6.3 kpc. This analysis demonstrates the robustness of the osculating circles formalism, but shows that further investigation is needed to assess how systematics affect the specific localization of the microlens parallax vector and, consequently, the inferred physical parameters.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Zang, Weicheng0000-0001-6000-3463
Shvartzvald, Yossi0000-0003-1525-5041
Udalski, Andrzej0000-0001-5207-5619
Yee, Jennifer C.0000-0001-9481-7123
Lee, Chung-Uk0000-0003-0043-3925
Sumi, Takahiro0000-0002-4035-5012
Yang, Hongjing0000-0003-0626-8465
Mao, Shude0000-0001-8317-2788
Calchi Novati, Sebastiano0000-0002-7669-1069
Zhu, Wei0000-0003-4027-4711
Beichman, Charles A.0000-0002-5627-5471
Bryden, Geoffery0000-0001-5966-837X
Carey, Sean0000-0002-0221-6871
Gaudi, B. Scott0000-0003-0395-9869
Henderson, Calen B.0000-0001-8877-9060
Mróz, Przemek0000-0001-7016-1692
Skowron, Jan0000-0002-2335-1730
Poleski, Radoslaw0000-0002-9245-6368
Szymański, Michał K.0000-0002-0548-8995
Soszyński, Igor0000-0002-7777-0842
Pietrukowicz, Paweł0000-0002-2339-5899
Kozłowski, Szymon0000-0003-4084-880X
Ulaczyk, Krzysztof0000-0001-6364-408X
Rybicki, Krzysztof A.0000-0002-9326-9329
Iwanek, Patryk0000-0002-6212-7221
Wrona, Marcin0000-0002-3051-274X
Albrow, Michael D.0000-0003-3316-4012
Chung, Sun-Ju0000-0001-6285-4528
Han, Cheongho0000-0002-2641-9964
Hwang, Kyu-Ha0000-0002-9241-4117
Jung, Youn Kil0000-0002-0314-6000
Ryu, Yoon-Hyun0000-0001-9823-2907
Shin, In-Gu0000-0002-4355-9838
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, Yongseok0000-0001-7594-8072
Park, Byeong-Gon0000-0002-6982-7722
Pogge, Richard W.0000-0003-1435-3053
Barry, Richard0000-0003-4916-0892
Bennett, David P.0000-0001-8043-8413
Fukui, Akihiko0000-0002-4909-5763
Hirao, Yuki0000-0003-4776-8618
Itow, Yoshitaka0000-0002-8198-1968
Kondo, Iona0000-0002-3401-1029
Koshimoto, Naoki0000-0003-2302-9562
Muraki, Yasushi0000-0003-1978-2092
Miyazaki, Shota0000-0001-9818-1513
Ranc, Clément0000-0003-2388-4534
Rattenbury, Nicholas J.0000-0001-5069-319X
Satoh, Yuki0000-0002-1228-4122
Suzuki, Daisuke0000-0002-5843-9433
Yonehara, Atsunori0000-0003-3480-0973
Bachelet, Etienne0000-0002-6578-5078
Maoz, Dan0000-0002-6579-0483
Penny, Matthew T.0000-0001-7506-5640
Street, Rachel A.0000-0001-6279-0552
Tsapras, Yiannis0000-0001-8411-351X
Alternate Title:OGLE-2018-BLG-0799Lb: a Sub-Saturn-Mass Planet Orbiting a Very Low Mass Dwarf
Additional Information:© 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2022 June 7. Received 2022 June 6; in original form 2020 October 16. Published: 14 June 2022. WZ, XZ, HY, and SM acknowledge support by the National Science Foundation of China (Grant No. 12133005). Work by JCY was supported by JPL grant 1571564. The OGLE has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to au. 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 MOA project is supported by JSPS KAKENHI Grant Number JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, JP16H06287, and JP17H02871. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories of China, the Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. This work is based (in part) on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. Work by AG was supported by AST-1516842 and by JPL grant 1500811. AG received support from the European Research Council under the European Unions Seventh Framework Programme (FP 7) ERC Grant Agreement n. [321035]. Wei Zhu was supported by the Beatrice and Vincent Tremaine Fellowship at CITA. Work by CH was supported by the grants of National Research Foundation of Korea (2017R1A4A1015178 and 2019R1A2C2085965). YT acknowledges the support of DFG priority program SPP 1992 ‘Exploring the Diversity of Extrasolar Planets’ (WA 1047/11-1). This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Data Availability: Data used in the light-curve analysis are provided along with publication.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Natural Science Foundation of China12133005
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Japan Society for the Promotion of Science (JSPS)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)JP16H06287
Japan Society for the Promotion of Science (JSPS)JP17H02871
National Astronomical Observatories of ChinaUNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
Ministry of Finance (China)UNSPECIFIED
European Research Council (ERC)321035
Canadian Institute for Theoretical AstrophysicsUNSPECIFIED
National Research Foundation of Korea2017R1A4A1015178
National Research Foundation of Korea2019R1A2C2085965
Deutsche Forschungsgemeinschaft (DFG)SPP 1992
Deutsche Forschungsgemeinschaft (DFG)WA 1047/11-1
Subject Keywords:gravitational lensing: micro –planets and satellites: detection
Issue or Number:4
Record Number:CaltechAUTHORS:20201030-152044892
Persistent URL:
Official Citation:Weicheng Zang, Yossi Shvartzvald, Andrzej Udalski, Jennifer C Yee, Chung-Uk Lee, Takahiro Sumi, Xiangyu Zhang, Hongjing Yang, Shude Mao, Sebastiano Calchi Novati, Andrew Gould, Wei Zhu, Charles A Beichman, Geoffery Bryden, Sean Carey, B Scott Gaudi, Calen B Henderson, Przemek Mróz, Jan Skowron, Radoslaw Poleski, Michał K Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A Rybicki, Patryk Iwanek, Marcin Wrona, Michael D Albrow, Sun-Ju Chung, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, Yoon-Hyun Ryu, In-Gu Shin, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W Pogge, Ian A Bond, Fumio Abe, Richard Barry, David P Bennett, Aparna Bhattacharya, Martin Donachie, Hirosane Fujii, Akihiko Fukui, Yuki Hirao, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Man Cheung Alex Li, Yutaka Matsubara, Yasushi Muraki, Shota Miyazaki, Clément Ranc, Nicholas J Rattenbury, Yuki Satoh, Hikaru Shoji, Daisuke Suzuki, Yuzuru Tanaka, Paul J Tristram, Tsubasa Yamawaki, Atsunori Yonehara, Etienne Bachelet, Markus P G Hundertmark, R Figuera Jaimes, Dan Maoz, Matthew T Penny, Rachel A Street, Yiannis Tsapras, OGLE-2018-BLG-0799Lb: a q ∼ 2.7 × 10−3 planet with Spitzer parallax, Monthly Notices of the Royal Astronomical Society, Volume 514, Issue 4, August 2022, Pages 5952–5968,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106368
Deposited By: Tony Diaz
Deposited On:30 Oct 2020 23:15
Last Modified:08 Aug 2022 20:50

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