An Earth-mass Planet in a 1 au Orbit around an Ultracool Dwarf

Astrophysical Journal Letters - Tập 840 Số 1 - Trang L3 - 2017
Yossi Shvartzvald1, Jennifer C. Yee2, S. Calchi Novati3,4, Andrew Gould5,6,7, Chung‐Uk Lee6,8, G. Bryden1, S. Carey9, B. Scott Gaudi5, A. Gould1, Wei Zhu5, Spitzer M Team, M. D. Albrow10, Sang-Mok Cha6,11, Sun‐Ju Chung6,8, Cheongho Han12, Kyu‐Ha Hwang13, Youn Kil Jung2, Dong-Jin Kim13, Hyoun-Woo Kim13, Seung‐Lee Kim6,8, Y. Lee6,11, B.-G. Park6,8, Richard W. Pogge5, Yoon-Hyun Ryu13, In-Gu Shin2
1Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
2Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA
3Dipartimento di Fisica ‘E. R. Caianiello’, Università di Salerno, Via Giovanni Paolo II, I-84084 Fisciano (SA), Italy
4IPAC, Mail Code 100-22, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA
5Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA
6Korea Astronomy and Space Science Institute, Daejon 305-348, Korea
7Max-Planck-Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
8Korea University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
9Spitzer, Science Center, MS 220-6, California Institute of Technology, Pasadena, CA, USA
10Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
11School of Space Research, Kyung Hee University, Yongin, 446-701, Korea
12Department of Physics, Chungbuk National University, Cheongju, 361‐763, Korea.
13Korea Astronomy & Space Science Institute, Daejon 305-348, Korea

Tóm tắt

Abstract We combine Spitzer and ground-based Korea Microlensing Telescope Network microlensing observations to identify and precisely measure an Earth-mass ( ) planet OGLE-2016-BLG-1195Lb at orbiting a ultracool dwarf. This is the lowest-mass microlensing planet to date. At 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.

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Astrophysical Journal Letters

Tập 840 Số 1

L3

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