A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251
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Aims. We present the analysis of the gravitational microlensing event OGLE-2011-BLG-0251. This anomalous event was observed by several survey and follow-up collaborations conducting microlensing observations towards the Galactic bulge. Methods. Based on detailed modelling of the observed light curve, we find that the lens is composed of two masses with a mass ratio q = 1.9 x 10-3. Thanks to our detection of higher-order effects on the light curve due to the Earth's orbital motion and the finite size of source, we are able to measure the mass and distance to the lens unambiguously. Results. We find that the lens is made up of a planet of mass 0.53 ± 0.21 MJ orbiting an M dwarf host star with a mass of 0.26 ± 0.11 M⊙. The planetary system is located at a distance of 2.57 ± 0.61 kpc towards the Galactic centre. The projected separation of the planet from its host star is d = 1.408 ± 0.019, in units of the Einstein radius, which corresponds to 2.72 ± 0.75 AU in physical units. We also identified a competitive model with similar planet and host star masses, but with a smaller orbital radius of 1.50 ± 0.50 AU. The planet is therefore located beyond the snow line of its host star, which we estimate to be around ~ 1-1.5 AU.
Kains , N , Street , R A , Choi , J -Y , Han , C , Udalski , A , Almeida , L A , Jablonski , F , Tristram , P J , Jorgensen , U G , Szymanski , M K , Kubiak , M , Pietrzynski , G , Soszynski , I , Poleski , R , Kozlowski , S , Pietrukowicz , P , Ulaczyk , K , Wyrzykowski , L , Skowron , J , Alsubai , K A , Bozza , V , Browne , P , Burgdorf , M J , Calchi Novati , S , Dodds , P , Dominik , M , Dreizler , S , Fang , X -S , Grundahl , F , Gu , C-H , Hardis , S , Harpsoe , K , Hessman , F V , Hinse , T C , Hornstrup , A , Hundertmark , M , Jessen-Hansen , J , Kerins , E , Liebig , C , Lund , M , Lundkvist , M , Mancini , L , Mathiasen , M , Penny , M T , Rahvar , S , Ricci , D , Sahu , K C , Scarpetta , G , Skottfelt , J , Snodgrass , C , Southworth , J , Surdej , J , Tregloan-Reed , J , Wambsganss , J , Wertz , O , Bajek , D , Bramich , D M , Horne , K , Ipatov , S , Steele , I A , Tsapras , Y , Abe , F , Bennett , D P , Bond , I A , Botzler , C S , Chote , P , Freeman , M , Fukui , A , Furusawa , K , Itow , Y , Ling , C H , Masuda , K , Matsubara , Y , Miyake , N , Muraki , Y , Ohnishi , K , Rattenbury , N , Saito , T , Sullivan , D J , Sumi , T , Suzuki , D , Suzuki , K , Sweatman , W L , Takino , S , Wada , K , Yock , P C M , Allen , W , Batista , V , Chung , S -J , Christie , G , DePoy , D L , Drummond , J , Gaudi , B S , Gould , A , Henderson , C , Jung , Y -K , Koo , J -R , Lee , C -U , McCormick , J , McGregor , D , Munoz , J A , Natusch , T , Ngan , H , Park , H , Pogge , R W , Shin , I -G , Yee , J , Albrow , M D , Bachelet , E , Beaulieu , J -P , Brillant , S , Caldwell , J A R , Cassan , A , Cole , A , Corrales , E , Coutures , C , Dieters , S , Prester , D D , Donatowicz , J , Fouque , P , Greenhill , J , Kane , S R , Kubas , D , Marquette , J -B , Martin , R , Meintjes , P , Menzies , J , Pollard , K R , Williams , A , Wouters , D & Zub , M 2013 , ' A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251 ' Astronomy & Astrophysics , vol 552 , A70 . DOI: 10.1051/0004-6361/201220626
Astronomy & Astrophysics
Reproduced with permission from Astronomy & Astrophysics, © 2013 ESO
N.K. acknowledges an ESO Fellowship. The research leading to these results has received funding from the European Community’s Seventh Framework Programme (/FP7/2007-2013/) under grant agreements No 229517 and 268421. The OGLE project has received funding from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement No. 246678 to AU. K.A., D.B., M.D., K.H., M.H., S.I., C.L., R.S., Y.T. are supported by NPRP grant NPRP-09-476-1-78 from the Qatar National Research Fund (a member of Qatar Foundation). Work by C. Han was supported by Creative Research Initiative Program (2009-0081561) of National Research Foundation of Korea. This work is based in part on data collected by MiNDSTEp with the Danish 1.54 m telescope at the ESO La Silla Observatory. The Danish 1.54 m telescope is operated based on a grant from the Danish Natural Science Foundation (FNU). The MiNDSTEp monitoring campaign is powered by ARTEMiS (Automated Terrestrial Exoplanet Microlensing Search; Dominik et al. 2008). M.H. acknowledges support by the German Research Foundation (DFG). D.R. (boursier FRIA), O.W. (aspirant FRS – FNRS) and J. Surdej acknowledge support from the Communauté française de Belgique – Actions de recherche concertées – Académie universitaire Wallonie-Europe. T.C.H. gratefully acknowledges financial support from the Korea Research Council for Fundamental Science and Technology (KRCF) through the Young Research Scientist Fellowship Program. T.C.H. and C.U.L. acknowledge financial support from KASI (Korea Astronomy and Space Science Institute) grant number 2012-1-410-02. Work by J. C. Yee is supported by a National Science Foundation Graduate Research Fellowship under Grant No. 2009068160. A. Gould and B. S. Gaudi acknowledge support from NSF AST-1103471. B. S. Gaudi, A. Gould, and R. W. Pogge acknowledge support from NASA grant NNX12AB99G. The MOA experiment was supported by grants JSPS22403003 and JSPS23340064. T.S. was supported by the grant JSPS23340044. Y. Muraki acknowledges support from JSPS grants JSPS23540339 and JSPS19340058.
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