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A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251

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Kains, N and Street, RA and Choi, J-Y and Han, C and Udalski, A and Almeida, LA and Jablonski, F and Tristram, PJ and Jorgensen, UG and Szymanski, MK and Kubiak, M and Pietrzynski, G and Soszynski, I and Poleski, R and Kozlowski, S and Pietrukowicz, P and Ulaczyk, K and Wyrzykowski, A and Skowron, J and Alsubai, KA and Bozza, V and Browne, P and Burgdorf, MJ and Calchi Novati, S and Dodds, P and Dominik, M and Dreizler, S and Fang, X-S and Grundahl, F and Gu, C-H and Hardis, S and Harpsoe, K and Hessman, FV and Hinse, TC and Hornstrup, A and Hundertmark, M and Jessen-Hansen, J and Kerins, E and Liebig, C and Lund, M and Lundkvist, M and Mancini, L and Mathiasen, M and Penny, MT and Rahvar, S and Ricci, D and Sahu, KC and Scarpetta, G and Skottfelt, J and Snodgrass, C and Southworth, J and Surdej, J and Tregloan-Reed, J and Wambsganss, J and Wertz, O and Bajek, D and Bramich, DM and Horne, K and Ipatov, S and Steele, IA and Tsapras, Y and Abe, F and Bennett, DP and Bond, IA and Botzler, CS and Chote, P and Freeman, M and Fukui, A and Furusawa, K and Itow, Y and Ling, CH and Masuda, K and Matsubara, Y and Miyake, N and Muraki, Y and Ohnishi, K and Rattenbury, N and Saito, T and Sullivan, DJ and Sumi, T and Suzuki, D and Suzuki, K and Sweatman, WL and Takino, S and Wada, K and Yock, PCM and Allen, W and Batista, V and Chung, S-J and Christie, G and DePoy, DL and Drummond, J and Gaudi, BS and Gould, A and Henderson, C and Jung, Y-K and Koo, J-R and Lee, C-U and McCormick, J and McGregor, D and Munoz, JA and Natusch, T and Ngan, H and Park, H and Pogge, RW and Shin, I-G and Yee, J and Albrow, MD and Bachelet, E and Beaulieu, J-P and Brillant, S and Caldwell, JAR and Cassan, A and Cole, A and Corrales, E and Coutures, C and Dieters, S and Dominis Prester, D and Donatowicz, J and Fouque, P and Greenhill, J and Kane, SR and Kubas, D and Marquette, J-B and Martin, R and Meintjes, P and Menzies, J and Pollard, KR and Williams, A and Wouters, D and Zub, M, A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251, Astronomy and Astrophysics, 552 Article A70. ISSN 0004-6361 (2013) [Refereed Article]


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Copyright 2013 ESO

DOI: doi:10.1051/0004-6361/201220626

Abstract

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 × 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.

Item Details

Item Type:Refereed Article
Keywords:gravitational lensing: weak / planets and satellites: detection / planetary systems / Galaxy: bulge
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Cole, A (Associate Professor Andrew Cole)
Author:Greenhill, J (Dr John Greenhill)
ID Code:87034
Year Published:2013
Web of Science® Times Cited:15
Deposited By:Mathematics and Physics
Deposited On:2013-11-06
Last Modified:2017-11-06
Downloads:160 View Download Statistics

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