MOA-2020-BLG-208Lb: Cool Sub-Saturn-mass Planet within Predicted Desert

Article

Olmschenk, Greg, Bennett, David P., Bond, Ian A., Zang, Weicheng, Jung, Youn Kil, Yee, Jennifer C., Bachelet, Etienne, Abe, Fumio, Barry, Richard K., Bhattacharya, Aparna and Drummond, John. 2023. "MOA-2020-BLG-208Lb: Cool Sub-Saturn-mass Planet within Predicted Desert." The Astronomical Journal. 165 (4). https://doi.org/10.3847/1538-3881/acbcc8
Article Title

MOA-2020-BLG-208Lb: Cool Sub-Saturn-mass Planet within Predicted Desert

ERA Journal ID1048
Article CategoryArticle
AuthorsOlmschenk, Greg, Bennett, David P., Bond, Ian A., Zang, Weicheng, Jung, Youn Kil, Yee, Jennifer C., Bachelet, Etienne, Abe, Fumio, Barry, Richard K., Bhattacharya, Aparna and Drummond, John
Journal TitleThe Astronomical Journal
Journal Citation165 (4)
Article Number175
Number of Pages11
Year2023
PublisherIOP Publishing
Place of PublicationUnited States
ISSN0004-6256
1538-3881
Digital Object Identifier (DOI)https://doi.org/10.3847/1538-3881/acbcc8
Web Address (URL)https://iopscience.iop.org/article/10.3847/1538-3881/acbcc8
AbstractWe analyze the MOA-2020-BLG-208 gravitational microlensing event and present the discovery and characterization of a new planet, MOA-2020-BLG-208Lb, with an estimated sub-Saturn mass. With a mass ratio q=3.17-0.26+0.28×10-4, the planet lies near the peak of the mass-ratio function derived by the MOA collaboration and near the edge of expected sample sensitivity. For these estimates we provide results using two mass-law priors: one assuming that all stars have an equal planet-hosting probability, and the other assuming that planets are more likely to orbit around more massive stars. In the first scenario, we estimate that the lens system is likely to be a planet of mass mplanet=46-24+42M? and a host star of mass Mhost=0.43-0.23+0.39M?, located at a distance DL=7.49-1.13+0.99kpc . For the second scenario, we estimate mplanet=69-34+37M?, Mhost=0.66-0.32+0.35M?, and DL=7.81-0.93+0.93kpc . The planet has a projected separation as a fraction of the Einstein ring radius s=1.3807-0.0018+0.0018 . As a cool sub-Saturn-mass planet, this planet adds to a growing collection of evidence for revised planetary formation models.
KeywordsGravitational microlensing (672); Gravitational microlensing exoplanet detection (2147); Binary lens microlensing (2136)
ANZSRC Field of Research 2020510109. Stellar astronomy and planetary systems
Byline AffiliationsNASA Goddard Space Flight Center, United States
Oak Ridge Associated Universities, United States
MOA Collaboration
University of Maryland, United States
Massey University, New Zealand
Tsinghua University, China
MAP Follow-Up Collaboration
Korea Astronomy and Space Science Institute, Korea
KMTNet Collaboration
Center for Astrophysics Harvard and Smithsonian, United States
MicroFUN Collaboration
Sorbonne University, France
OMEGA Collaboration
Nagoya University, Japan
Possum Observatory, New Zealand
Centre for Astrophysics
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