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

Shvartzvald, Y. and Calchi Novati, S. and Beichman, C. and Carey, S. (2017) An Earth-mass Planet in a 1 au Orbit around an Ultracool Dwarf. Astrophysical Journal Letters, 840 (1). Art. No. L3. ISSN 2041-8205. doi:10.3847/2041-8213/aa6d09.

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We combine Spitzer and ground-based Korea Microlensing Telescope Network microlensing observations to identify and precisely measure an Earth-mass (1.43^(+0.45)_(-0.32) M⊕) planet OGLE-2016-BLG-1195Lb at 1.16^(+0.16)_(-0.13) au orbiting a 0.078^(+0.016)_(-0.012) M⊙ ultracool dwarf. This is the lowest-mass microlensing planet to date. At 3.91^(+0.42)_(-0.46) 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Shvartzvald, Y.0000-0003-1525-5041
Calchi Novati, S.0000-0002-7669-1069
Beichman, C.0000-0002-5627-5471
Carey, S.0000-0002-0221-6871
Alternate Title:An Earth-mass Planet in a 1-AU Orbit around a Brown Dwarf
Additional Information:© 2017 The American Astronomical Society. Received 2017 March 24; revised 2017 April 7; accepted 2017 April 10; published 2017 April 26. We thank D. Kirkpatrick for fruitful discussions about BDs. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. Work by Y.S. and C.B.H. was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by Universities Space Research Association through a contract with NASA. Work by A.G., J.C.Y., and S.C.N. were supported by JPL grant 1500811. Work by A.G., W.Z., Y.K.J., and I.G.S. were supported by NSF grant AST-1516842. Work by C.H. was supported by Creative Research Initiative Program (2009-0081561) of National Research Foundation of Korea. Work by S.C.N. was supported by NExScI.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
National Research Foundation of Korea2009-0081561
Subject Keywords:binaries: general – Galaxy: bulge – gravitational lensing: micro – planetary systems
Issue or Number:1
Record Number:CaltechAUTHORS:20170426-100438421
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Official Citation:Y. Shvartzvald et al 2017 ApJL 840 L3
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76943
Deposited By: Tony Diaz
Deposited On:26 Apr 2017 18:00
Last Modified:15 Nov 2021 17:04

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