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The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)cWe present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q approx. = 3.4×10(exp −4), but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with two classes of models: two-planet models (with a single host star) and circumbinary planet models. The light curve also reveals a significant microlensing parallax effect, which constrains the mass of the lens system to be M(sub L) approx. = 0.7 Stellar Mass. Hubble Space Telescope (HST) images resolve the lens and source stars from their neighbors and indicate excess flux due to the star(s) in the lens system. This is consistent with the predicted flux from the circumbinary models, where the lens mass is shared between two stars, but there is not enough flux to be consistent with the two-planet, one-star models. So, only the circumbinary models are consistent with the HST data. They indicate a planet of mass m(sub c) = 80 +/- 13 Stellar Mass, orbiting a pair of M dwarfs with masses of M(sub A) = 0.41+/- 0.07 and M(sub B) = 0.30 +/- 0.07, which makes this the lowest-mass circumbinary planet system known. The ratio of the separation between the planet and the center of mass to the separation of the two stars is approx.40, so unlike most of the circumbinary planets found by Kepler, the planet does not orbit near the stability limit.
Document ID
20160013716
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Bennett, D. P.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Rhie, S. H.
(Notre Dame Univ. Notre Dame, IN, United States)
Udalski, A.
(Warsaw Univ. Observatory Warsaw, Poland)
Gould, A.
(Ohio State Univ. Columbus, OH, United States)
Tsapras, Y.
(Heidelberg Univ. Heidelberg, Germany)
Kubas, D.
(Institut d'Astrophysique Paris, France)
Bond, I. A.
(Massey University Auckland Auckland, New Zealand)
Greenhill, J.
(Tasmania Univ. Hobart, Australia)
Cassan, A.
(Institut d'Astrophysique Paris, France)
Rattenbury, N. J.
(Auckland Univ. New Zealand)
Boyajian, T. S.
(Yale Univ. New Haven, CT, United States)
Luhn, J.
(Pennsylvania State Univ. University Park, PA, United States)
Penny, M. T.
(Ohio State Univ. Columbus, OH, United States)
Anderson, J.
(Space Telescope Science Inst. Baltimore, MD, United States)
Abe, F.
(Nagoya Univ. Nagoya, Japan)
Bhattacharya, A.
(Notre Dame Univ. Notre Dame, IN, United States)
Botzler, C. S.
(Auckland Univ. New Zealand)
Donachie, M.
(Auckland Univ. New Zealand)
Freeman, M.
(Auckland Univ. New Zealand)
Fukui, A.
(National Astronomical Observatory Okayama, Japan)
Hirao, Y.
(Osaka Univ. Toyonaka, Japan)
Itow, Y.
(Nagoya Univ. Nagoya, Japan)
Koshimoto, N.
(Osaka Univ. Toyonaka, Japan)
Li, M. C. A.
(Auckland Univ. New Zealand)
Suzuki, Daisuke
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Date Acquired
November 22, 2016
Publication Date
October 21, 2016
Publication Information
Publication: The Astronomical Journal
Publisher: The American Astronomical Society
Volume: 152
Issue: 125
e-ISSN: 1538-3881
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN42328
GSFC-E-DAA-TN37484
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
CONTRACT_GRANT: NNG17PT01A
CONTRACT_GRANT: NNX12AF54G
CONTRACT_GRANT: NNX13AF64G
Distribution Limits
Public
Copyright
Other
Keywords
OGLE-2007-BLG-349
M dwarfs
circumbinary planet microlensing event
Hubble Space Telescope (HST)

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