OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel

Type of content
Journal Article
Thesis discipline
Degree name
Publisher
American Astronomical Society
Journal Title
Journal ISSN
Volume Title
Language
Date
2021
Authors
Jung YK
Han C
Udalski A
Gould A
Yee JC
Chung S-J
Hwang K-H
Ryu Y-H
Shin I-G
Shvartzvald Y
Abstract

We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely and continuously covered by two high-cadence surveys. The light-curve modeling indicates that the anomalies are generated by source crossings over the planetary caustics induced by planetary companions to the hosts. The estimated planet/host separation (scaled to the angular Einstein radius θE) and mass ratio are (s,q)=(1.81,1.24×10−3) and (s,q)=(1.25,2.38×10−3), respectively. From Bayesian analyses, we estimate the host and planet masses as (Mh,Mp)=(0.24−0.13+0.16M⊙,0.32−0.16+0.34MJ) and (Mh,Mp)=(0.55−0.29+0.32M⊙,1.37−0.72+0.80MJ), respectively. These planetary systems are located at a distance of 7.07−1.15+0.93kpc for OGLE-2018-BLG-0567 and 6.47−1.73+1.04kpc for OGLE-2018-BLG-0962, suggesting that they are likely to be near the Galactic bulge. The two events prove the capability of current high-cadence surveys for finding planets through the planetary-caustic channel. We find that most published planetary-caustic planets are found in Hollywood events in which the source size strongly contributes to the anomaly cross section relative to the size of the caustic.

Description
Citation
Jung YK, Han C, Udalski A, Gould A, Yee JC, Albrow MD, Chung S-J, Hwang K-H, Ryu Y-H, Shin I-G, Shvartzvald Y, Zhu W, Zang W, Cha S-M, Kim D-J, Kim H-W, Kim S-L, Lee C-U, Lee D-J, Lee Y, Park B-G, Mróz RWPP, Szymański MK, Skowron J, Poleski R, Soszyński I, Pietrukowicz P, Kozłowski S, Ulaczyk K, Rybicki KA, Iwanek P, Wrona M (2021). OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel. The Astronomical Journal. 161(6). 293-293.
Keywords
astro-ph.EP, astro-ph.GA, gravitational lensing: micro – planetary systems
Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
0201 Astronomical and Space Sciences
Fields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems
51 - Physical sciences::5101 - Astronomical sciences::510107 - Planetary science (excl. solar system and planetary geology)
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All rights reserved unless otherwise stated