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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742851.0, MPI für Astronomie / Publikationen_mpia
An Earth-mass planet in a 1 au orbit around an ultracool dwarf
Authors:Shvartzvald, Y.; Yee, J. C.; Calchi Novati, S.; Gould, A.; Lee, C. -. U.; Beichman, C.; Bryden, G.; Carey, S.; Gaudi, B. S.; Henderson, C. B.; Zhu, W.; Albrow, M. D.; Cha, S. -. M.; Chung, S. -. J.; Han, C.; Hwang, K. -. H.; Jung, Y. K.; Kim, D. -. J.; Kim, H. -. W.; Kim, S. -. L.; Lee, Y.; Park, B. -. G.; Pogge, R. W.; Ryu, Y. -. H.; Shin, I. -. G.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal Letters
Issue / Number:1
Start Page:id. L3 (7 pp)
Audience:Not Specified
Abstract / Description:We combine Spitzer and ground-based Korea Microlensing Telescope Network microlensing observations to identify and precisely measure an Earth-mass ({1.43}-0.32+0.45{M}\oplus ) planet OGLE-2016-BLG-1195Lb at {1.16}-0.13+0.16 {au} orbiting a {0.078}-0.012+0.016{M}ȯ ultracool dwarf. This is the lowest-mass microlensing planet to date. At {3.91}-0.46+0.42 kpc, it is the third consecutive case among the Spitzer “Galactic distribution” planets toward the Galactic bulge that lies in the Galactic disk as opposed to the bulge itself, hinting at a skewed distribution of planets. Together with previous microlensing discoveries, the seven Earth-size planets orbiting the ultracool dwarf TRAPPIST-1, and the detection of disks around young brown dwarfs, OGLE-2016-BLG-1195Lb suggests that such planets might be common around ultracool dwarfs. It therefore sheds light on the formation of both ultracool dwarfs and planetary systems at the limit of low-mass protoplanetary disks.
Free Keywords:binaries: general; Galaxy: bulge; gravitational lensing: micro; planetary systems
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/2041-8213/aa6d09
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