The Open UniversitySkip to content
 

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

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.; Pietrzyński, G.; Soszyński, I.; Poleski, R.; Kozłowski, S.; Pietrukowicz, P.; Ulaczyk, K.; Wyrzykowski, Ł.; 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.; Harpsøe, 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.; Muñoz, 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, Ch.; Dieters, S.; Dominis Prester, D.; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Kane, S. R.; Kubas, D.; Marquette, J.-B.; Martin, R.; Meintjes, P.; Menzies, J.; Pollard, K. R.; Williams, A.; Wouters, D. and Zub, M. (2013). A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251. Astronomy & Astrophysics, 552, article no. A70.

DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201220626
Google Scholar: Look up in Google Scholar

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 Type: Journal Item
Copyright Holders: 2013 ESO
ISSN: 1432-0746
Extra Information: 10 pp.
Keywords: gravitational lensing; planets and satellites; planetary systems; galactic bulge
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Space
Item ID: 43050
Depositing User: Colin Snodgrass
Date Deposited: 21 May 2015 15:53
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43050
Share this page:

Metrics

Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU