The Astronomical Journal (Jan 2024)
OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant
- Rintaro Kirikawa,
- Takahiro Sumi,
- David P. Bennett,
- Daisuke Suzuki,
- Naoki Koshimoto,
- Shota Miyazaki,
- Ian A. Bond,
- Andrzej Udalski,
- Nicholas J. Rattenbury,
- Leading Authors,
- Fumio Abe,
- Richard Barry,
- Aparna Bhattacharya,
- Hirosane Fujii,
- Akihiko Fukui,
- Ryusei Hamada,
- Yuki Hirao,
- Stela Ishitani Silva,
- Yoshitaka Itow,
- Yutaka Matsubara,
- Yasushi Muraki,
- Greg Olmschenk,
- Clément Ranc,
- Yuki K. Satoh,
- Mio Tomoyoshi,
- Paul . J. Tristram,
- Aikaterini Vandorou,
- Hibiki Yama,
- Kansuke Yamashita,
- MOA COLLABORATION,
- Przemek Mróz,
- Radosław Poleski,
- Jan Skowron,
- Michał K. Szymański,
- Igor Soszyński,
- Paweł Pietrukowicz,
- Szymon Kozłowski,
- Krzysztof Ulaczyk,
- Mateusz J. Mróz,
- OGLE COLLABORATION
Affiliations
- Rintaro Kirikawa
- ORCiD
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- Takahiro Sumi
- ORCiD
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- David P. Bennett
- ORCiD
- Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USA
- Daisuke Suzuki
- ORCiD
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- Naoki Koshimoto
- ORCiD
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- Shota Miyazaki
- ORCiD
- Institute of Space and Astronautical Science , Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan
- Ian A. Bond
- Institute of Natural and Mathematical Sciences, Massey University , Auckland 0745, New Zealand
- Andrzej Udalski
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Nicholas J. Rattenbury
- ORCiD
- Department of Physics, University of Auckland , Private Bag 92019, Auckland, New Zealand
- Leading Authors
- Fumio Abe
- Institute for Space-Earth Environmental Research, Nagoya University , Nagoya 464-8601, Japan
- Richard Barry
- ORCiD
- Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA
- Aparna Bhattacharya
- Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USA
- Hirosane Fujii
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- Akihiko Fukui
- ORCiD
- Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Instituto de Astrofísica de Canarias , Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
- Ryusei Hamada
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- Yuki Hirao
- ORCiD
- Institute of Astronomy, Graduate School of Science, The University of Tokyo , 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
- Stela Ishitani Silva
- ORCiD
- Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Department of Physics, The Catholic University of America , Washington, DC 20064, USA
- Yoshitaka Itow
- ORCiD
- Institute for Space-Earth Environmental Research, Nagoya University , Nagoya 464-8601, Japan
- Yutaka Matsubara
- ORCiD
- Institute for Space-Earth Environmental Research, Nagoya University , Nagoya 464-8601, Japan
- Yasushi Muraki
- ORCiD
- Institute for Space-Earth Environmental Research, Nagoya University , Nagoya 464-8601, Japan
- Greg Olmschenk
- ORCiD
- Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA
- Clément Ranc
- ORCiD
- Sorbonne Université, CNRS, UMR 7095, Institut d’Astrophysique de Paris , 98 bis bd Arago, 75014 Paris, France
- Yuki K. Satoh
- ORCiD
- College of Science and Engineering, Kanto Gakuin University , 1-50-1 Mutsuurahigashi, Kanazawa-ku, Yokohama, Kanagawa 236-8501, Japan
- Mio Tomoyoshi
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- Paul . J. Tristram
- University of Canterbury Mt. John Observatory , P.O. Box 56, Lake Tekapo 8770, New Zealand
- Aikaterini Vandorou
- Code 667, NASA Goddard Space Flight Center , Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USA
- Hibiki Yama
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- Kansuke Yamashita
- Department of Earth and Space Science, Graduate School of Science, Osaka University , Toyonaka, Osaka 560-0043, Japan
- MOA COLLABORATION
- Przemek Mróz
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Radosław Poleski
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Jan Skowron
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Michał K. Szymański
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Igor Soszyński
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Paweł Pietrukowicz
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Szymon Kozłowski
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- Krzysztof Ulaczyk
- ORCiD
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry, CV4 7AL, UK
- Mateusz J. Mróz
- Warsaw University Observatory , Al. Ujazdowskie 4, 00-478 Warszawa, Poland
- OGLE COLLABORATION
- DOI
- https://doi.org/10.3847/1538-3881/ad2703
- Journal volume & issue
-
Vol. 167,
no. 4
p. 154
Abstract
We present the analysis of the microlensing event OGLE-2014-BLG-0221, a planetary candidate event discovered in 2014. The photometric light curve is best described by a binary-lens single-source model. Our light-curve modeling finds two degenerate models, with event timescales of t _E ∼ 70 days and ∼110 days. These timescales are relatively long, indicating that the discovered system would possess a substantial mass. The two models are similar in their planetary parameters with a Jupiter mass ratio of q ∼ 10 ^−3 and a separation of s ∼ 1.1. Bayesian inference is used to estimate the physical parameters of the lens, revealing that the shorter timescale model predicts 65% and 25% probabilities of a late-type star and white dwarf host, respectively, while the longer timescale model favors a black hole host with a probability ranging from 60% to 95%, under the assumption that stars and stellar remnants have equal probabilities of hosting companions with planetary mass ratios. If the lens is a remnant, this would be the second planet found by microlensing around a stellar remnant. The current separation between the source and lens stars is 41–139 mas depending on the models. This indicates the event is now ready for high-angular-resolution follow-up observations to rule out either of the models. If precise astrometric measurements are conducted in multiple bands, the centroid shift due to the color difference between the source and lens would be detected in the luminous lens scenario.
Keywords