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Ogle-2012-blg-0724lb: A Saturn Mass Planet Around an M-dwarfWe report the discovery of a planet by the microlensing method, OGLE-2012-BLG-0724Lb. Although the duration of the planetary signal for this event was one of the shortest seen for a planetary event, the anomaly was well covered thanks to high-cadence observations taken by the survey groups OGLE and MOA. By analyzing the light curve, this planetary system is found to have a mass ratio q = (1.58 +/- 0.15) x 10(exp -3). By conducting a Bayesian analysis, we estimate that the host star is an M dwarf with a mass of M(sub L) = 0.29(+0.33/-0.16) solar mass located at D(sub L) = 6.7(+1.1/-1.2) kpc away from the Earth and the companion's mass is m(sub P) = 0.47(+0.54/-0.26) M(Jup). The projected planet- host separation is a falsum = 1.6(+0.4/-0.3) AU. Because the lens-source relative proper motion is relatively high, future highresolution images would detect the lens host star and determine the lens properties uniquely. This system is likely a Saturn-mass exoplanet around an M dwarf, and such systems are commonly detected by gravitational microlensing. This adds another example of a possible pileup of sub-Jupiters (0.2 less than m(sub P)/M(sub Jup) less than 1) in contrast to a lack of Jupiters (approximately 1-2 M(sub Jup)) around M dwarfs, supporting the prediction by core accretion models that Jupiter-mass or more massive planets are unlikely to form around M dwarfs.
Document ID
20160010648
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Hirao, Y.
(Osaka Univ. Osaka, Japan)
Sumi, T.
(Osaka Univ. Osaka, Japan)
Bennett, D. P.
(Notre Dame Univ. IN, United States)
Bond, I. A.
(Massey Univ. New Zealand)
Rattenbury, N.
(Warsaw Univ. Warsaw, Poland)
Suzuki, D.
(Warsaw Univ. Warsaw, Poland)
Koshimoto, N.
(Osaka Univ. Osaka, Japan)
Abe, F.
(Nagoya Univ. Nagoya, Japan)
Asakura, Y.
(Nagoya Univ. Nagoya, Japan)
Bhattacharya, A.
(Notre Dame Univ. IN, United States)
Date Acquired
August 30, 2016
Publication Date
June 21, 2016
Publication Information
Publication: The Astrophysical Journal
Publisher: The American Astronomical Society
Volume: 824
Issue: 2
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN33865
Funding Number(s)
CONTRACT_GRANT: JSPS24253004
CONTRACT_GRANT: NNG06EO90A
CONTRACT_GRANT: JSPS23103002
CONTRACT_GRANT: MAU1104
CONTRACT_GRANT: JSPS23340064
CONTRACT_GRANT: NSF-AST-1009621
CONTRACT_GRANT: NNX12AF54G
CONTRACT_GRANT: NNX13AF64G
CONTRACT_GRANT: JSPS25103508
CONTRACT_GRANT: JSPS26247023
CONTRACT_GRANT: MAESTRO 2014/14/A/ST9/00121
CONTRACT_GRANT: NSF-AST-1211875
Distribution Limits
Public
Copyright
Other
Keywords
microlensing
high-cadence observations
Saturn-mass exoplanet

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