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 ID | 1048 |
| Article Category | Article |
| Authors | 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 |
| Journal Title | The Astronomical Journal |
| Journal Citation | 165 (4) |
| Article Number | 175 |
| Number of Pages | 11 |
| Year | 2023 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-6256 |
| 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 |
| Abstract | We 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. |
| Keywords | Gravitational microlensing (672); Gravitational microlensing exoplanet detection (2147); Binary lens microlensing (2136) |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Byline Affiliations | NASA 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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https://research.usq.edu.au/item/z2687/moa-2020-blg-208lb-cool-sub-saturn-mass-planet-within-predicted-desert
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