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Revisiting the Microlensing Event OGLE 2012-BLG-0026: A Solar Mass Star with Two Cold Giant PlanetsTwo cold gas giant planets orbiting a G-type main-sequence star in the galactic disk were previously discovered in the high-magnification microlensing event OGLE-2012-BLG-0026. Here, we present revised host star flux measurements and a refined model for the two-planet system using additional light curve data. We performed high angular resolution adaptive optics imaging with the Keck and Subaru telescopes at two epochs while the source star was still amplified. We detected the lens flux, H = 16.39 +/- 0.08. The lens, a disk star, is brighter than predicted from the modeling in the original study. We revisited the light curve modeling using additional photometric data from the B and C telescope in New Zealand and CTIO 1.3 m H-band light curve. We then include the Keck and Subaru adaptive optic observation constraints. The system is composed of an approximately 4-9 Gyr lens star of M(sub lens) = 1.06 +/- 0.05 solar mass at a distance of D(sub lens) = 4.0 +/- 0.3 kpc, orbited by two giant planets of 0.145 +/- 0.008 M(sub Jup) and 0.86 +/- 0.06 M(sub Jup), with projected separations of 4.0 +/- 0.5 au and 4.8 +/- 0.7 au, respectively. Because the lens is brighter than the source star by 16 +/- 8% in H, with no other blend within one arcsec, it will be possible to estimate its metallicity using subsequent IR spectroscopy with 8-10 m class telescopes. By adding a constraint on the metallicity it will be possible to refine the age of the system.
Document ID
20160009776
Document Type
Reprint (Version printed in journal)
Authors
Beaulieu, J.-P.
(Paris Univ. France)
Bennett, D. P.
(Notre Dame Univ. IN, United States)
Batista, V.
(Paris Univ. France)
Fukui, A.
(National Astronomical Observatory Okayama, Japan)
Marquette, J.-B.
(Paris Univ. France)
Brillant, S.
(European Southern Observatory Garching, Germany)
Cole, A. A.
(Tasmania Univ. Hobart, Australia)
Rogers, L. A.
(Chicago Univ. Chicago, IL, United States)
Sumi, T.
(Osaka Univ. Osaka, Japan)
Abe, F.
(Nagoya Univ. Nagoya, Japan)
Date Acquired
August 2, 2016
Publication Date
June 15, 2016
Publication Information
Publication: The Astrophysical Journal
Volume: 824
Issue: 2
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN34155
Funding Number(s)
CONTRACT_GRANT: NNX12AF54G
CONTRACT_GRANT: JPL-JPLRSA
CONTRACT_GRANT: NNG06EO90A
CONTRACT_GRANT: NRFK-2009-0081561
CONTRACT_GRANT: NSF-AST-1211875
CONTRACT_GRANT: JSPS23340064
Distribution Limits
Public
Copyright
Other
Keywords
high-magnification microlensing event OGLE-2012-BLG-0026
galactic disk
H-band light curve
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