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OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge

2020; Institute of Physics; Volume: 159; Issue: 6 Linguagem: Inglês

10.3847/1538-3881/ab893e

1538-3881

Antonio Herrera-Martín, Michael D. Albrow, A. Udalski, Andrew Gould, Yoon-Hyun Ryu, Jennifer C. Yee, Sun‐Ju Chung, Cheongho Han, Kyu‐Ha Hwang, Youn Kil Jung, Chung‐Uk Lee, In-Gu Shin, Yossi Shvartzvald, Weicheng Zang, S.-M. Cha, D.-J. Kim, Hyoun-Woo Kim, S.-L. Kim, D.-J. Lee, Yongseok Lee, B.-G. Park, Richard W. Pogge, M. K. Szymański, P. Mróz, J. Skowron, R. Poleski, I. Soszyński, S. Kozłowski, P. Pietrukowicz, K. Ulaczyk, K. Rybicki, Patryk Iwanek, Marcin Wrona,

Astrophysics and Star Formation Studies

Abstract We report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star–planet system. Although there are two degenerate solutions that could not be distinguished for this event, both lead to a similar planet-host mass ratio. We perform a Bayesian analysis based on a Galactic model to obtain the properties of the system and find that the planet corresponds to a super-Earth/sub-Neptune with a mass of . The host star has a mass of . The projected separation for the inner and outer solutions are au and au respectively. At , this is by far the lowest Δ χ 2 for any securely detected microlensing planet to date, a feature that is closely connected to the fact that it is detected primarily via a “dip” rather than a “bump.”