Article (Scientific journals)
A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251
Kains, N.; Street, R. A.; Choi, J.-Y. et al.
2013In Astronomy and Astrophysics, 552, p. 70
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Keywords :
gravitational lensing: weak; planets and satellites: detection; planetary systems; Galaxy: bulge
Abstract :
[en] <BR /> 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. <BR /> 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 × 10[SUP]-3[/SUP]. 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. <BR /> Results: We find that the lens is made up of a planet of mass 0.53 ± 0.21 M[SUB]J[/SUB] orbiting an M dwarf host star with a mass of 0.26 ± 0.11 M[SUB]⊙[/SUB]. 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Kains, N.
Street, R. A.
Choi, J.-Y.
Han, C.
Udalski, A.
Almeida, L. A.
Jablonski, F.
Tristram, P. J.
Jørgensen, U. G.
Szymański, M. K.
Kubiak, M.
Muraki, Y.
Bennett, D. P.
Kozłowski, S.
Gu, C.-H.
Liebig, C.
Batista, V.
Dodds, P.
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Abe, F.
Browne, P.
Masuda, K.
Mancini, L.
Caldwell, J. A. R.
Natusch, T.
Bramich, D. M.
Lee, C.-U.
Yock, P. C. M.
Sumi, T.
Freeman, M.
Botzler, C. S.
Dreizler, S.
Allen, W.
Jessen-Hansen, J.
Skottfelt, J.
Beaulieu, J.-P.
Wertz, Olivier ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Jung, Y.-K.
Cassan, A.
Furusawa, K.
Martin, R.
Fang, X.-S.
Ulaczyk, K.
Kubas, D.
Christie, G.
Drummond, J.
Zub, M.
Brillant, S.
Dieters, S.
Shin, I.-G.
Skowron, J.
Suzuki, D.
Dominis Prester, D.
Tregloan-Reed, J.
Lundkvist, M.
Marquette, J.-B.
Sahu, K. C.
Bond, I. A.
Menzies, J.
Henderson, C.
Dominik, M.
Williams, A.
Kane, S. R.
Rahvar, S.
Takino, S.
Calchi Novati, S.
Gould, A.
Bozza, V.
McGregor, D.
Burgdorf, M. J.
Southworth, J.
Hardis, S.
Wada, K.
Hessman, F. V.
Itow, Y.
Ipatov, S.
Hundertmark, M.
Wambsganss, J.
Ricci, Davide ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Harpsøe, K.
Greenhill, J.
Meintjes, P.
Matsubara, Y.
Tsapras, Y.
Koo, J.-R.
Hornstrup, A.
Ngan, H.
Sweatman, W. L.
Ling, C. H.
Pietrukowicz, P.
Pogge, R. W.
Pietrzyński, G.
Chung, S.-J.
Poleski, R.
Sullivan, D. J.
Miyake, N.
Saito, T.
Coutures, Ch
Ohnishi, K.
Suzuki, K.
Penny, M. T.
Scarpetta, G.
Bachelet, E.
Snodgrass, C.
DePoy, D. L.
Gaudi, B. S.
Wouters, D.
Park, H.
Pollard, K. R.
Alsubai, K. A.
Donatowicz, J.
Albrow, M. D.
Yee, J.
Soszyński, I.
Fouqué, P.
Bajek, D.
Kerins, E.
Horne, K.
Cole, A.
McCormick, J.
Wyrzykowski, Ł.
Muñoz, J. A.
Steele, I. A.
Hinse, T. C.
Fukui, A.
Corrales, E.
Rattenbury, N.
Grundahl, F.
Chote, P.
Lund, M.
Mathiasen, M.
More authors (121 more) Less
Language :
English
Title :
A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251
Publication date :
01 April 2013
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
552
Pages :
70
Peer reviewed :
Peer Reviewed verified by ORBi
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