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

Noé Kains; R. A. Street; J. -Y. Choi; C. Han; A. Udalski; L. A. Almeida; F. Jablonski; P. J. Tristram; U. G. Jorgensen; M. K. Szymanski; M. Kubiak; G. Pietrzynski; I. Soszynski; R. Poleski; S. Kozlowski; P. Pietrukowicz; K. Ulaczyk; L. Wyrzykowski; J. Skowron; K. A. Alsubai; V. Bozza; P. Browne; M. J. Burgdorf; S. Calchi Novati; P. Dodds; M. Dominik; S. Dreizler; X. -S. Fang; F. Grundahl; C-H. Gu; S. Hardis; K. Harpsoe; F. V. Hessman; T. C. Hinse; A. Hornstrup; M. Hundertmark; J. Jessen-Hansen; E. Kerins; C. Liebig; M. Lund; M. Lundkvist; L. Mancini; M. Mathiasen; M. T. Penny; S. Rahvar; D. Ricci; K. C. Sahu; G. Scarpetta; J. Skottfelt; C. Snodgrass; J. Southworth; J. Surdej; J. Tregloan-Reed; J. Wambsganss; O. Wertz; D. Bajek; D. M. Bramich; K. Horne; S. Ipatov; I. A. Steele; Y. Tsapras; F. Abe; D. P. Bennett; I. A. Bond; C. S. Botzler; P. Chote; M. Freeman; A. Fukui; K. Furusawa; Y. Itow; C. H. Ling; K. Masuda; Y. Matsubara; N. Miyake; Y. Muraki; K. Ohnishi; N. Rattenbury; T. Saito; D. J. Sullivan; T. Sumi; D. Suzuki; K. Suzuki; W. L. Sweatman; S. Takino; K. Wada; P. C. M. Yock; W. Allen; V. Batista; S. -J. Chung; G. Christie; D. L. DePoy; J. Drummond; B. S. Gaudi; A. Gould; C. Henderson; Y. -K. Jung; J. -R. Koo; C. -U. Lee; J. McCormick; D. McGregor; J. A. Munoz; T. Natusch; H. Ngan; H. Park; R. W. Pogge; I. -G. Shin; J. Yee; M. D. Albrow; E. Bachelet; J. -P. Beaulieu; S. Brillant; J. A. R. Caldwell; A. Cassan; A. Cole; E. Corrales; Ch. Coutures; S. Dieters; D. Dominis Prester; J. Donatowicz; P. Fouque; J. Greenhill; S. R. Kane; D. Kubas; J. -B. Marquette; R. Martin; P. Meintjes; J. Menzies; K. R. Pollard; A. Williams; D. Wouters; M. Zub

doi:10.1051/0004-6361/201220626

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

Noé Kains, R. A. Street, J. -Y. Choi, C. Han, A. Udalski, L. A. Almeida, F. Jablonski, P. J. Tristram, U. G. Jorgensen, M. K. Szymanski, M. Kubiak, G. Pietrzynski, I. Soszynski, R. Poleski, S. Kozlowski, P. Pietrukowicz, K. Ulaczyk, L. Wyrzykowski, J. Skowron, K. A. AlsubaiV. Bozza, P. Browne, M. J. Burgdorf, S. Calchi Novati, P. Dodds, M. Dominik, S. Dreizler, X. -S. Fang, F. Grundahl, C-H. Gu, S. Hardis, K. Harpsoe, F. V. Hessman, T. C. Hinse, A. Hornstrup, M. Hundertmark, J. Jessen-Hansen, E. Kerins, C. Liebig, M. Lund, M. Lundkvist, L. Mancini, M. Mathiasen, M. T. Penny, S. Rahvar, D. Ricci, K. C. Sahu, G. Scarpetta, J. Skottfelt, C. Snodgrass, J. Southworth, J. Surdej, J. Tregloan-Reed, J. Wambsganss, O. Wertz, D. Bajek, D. M. Bramich, K. Horne, S. Ipatov, I. A. Steele, Y. Tsapras, F. Abe, D. P. Bennett, I. A. Bond, C. S. Botzler, P. Chote, M. Freeman, A. Fukui, K. Furusawa, Y. Itow, C. H. Ling, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, K. Ohnishi, N. Rattenbury, T. Saito, D. J. Sullivan, T. Sumi, D. Suzuki, K. Suzuki, W. L. Sweatman, S. Takino, K. Wada, P. C. M. Yock, W. Allen, V. Batista, S. -J. Chung, G. Christie, D. L. DePoy, J. Drummond, B. S. Gaudi, A. Gould, C. Henderson, Y. -K. Jung, J. -R. Koo, C. -U. Lee, J. McCormick, D. McGregor, J. A. Munoz, T. Natusch, H. Ngan, H. Park, R. W. Pogge, I. -G. Shin, J. Yee, M. D. Albrow, E. Bachelet, J. -P. Beaulieu, S. Brillant, J. A. R. Caldwell, A. Cassan, A. Cole, E. Corrales, Ch. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. Fouque, J. Greenhill, S. R. Kane, D. Kubas, J. -B. Marquette, R. Martin, P. Meintjes, J. Menzies, K. R. Pollard, A. Williams, D. Wouters, M. Zub

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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 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 M_Jorbiting 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.

Original language	English
Article number	A70
Number of pages	10
Journal	Astronomy & Astrophysics
Volume	552
Early online date	27 Mar 2013
DOIs	https://doi.org/10.1051/0004-6361/201220626
Publication status	Published - Apr 2013

Keywords

Gravitational lensing: weak
Planets and satellites: detection
Planetary systems
Galaxy: bulge
Binary
Dwarf
Mass
Lens
Stars
Algorithm
Discovery
Frequency
Systems
Search

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10.1051/0004-6361/201220626

Browne_2013_AA_AGiant
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Astrophysics at St Andrews:2012 - 2014: Astrophysics at St Andrews: 2012 - 2014
Horne, K. D. (PI)
Science & Technology Facilities Council
1/10/11 → 31/03/12
Project: Standard

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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., ... Zub, M. (2013). A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251. Astronomy & Astrophysics, 552, Article A70. https://doi.org/10.1051/0004-6361/201220626

@article{fad22eab8e7d4f84960d6788a95102a3,

title = "A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251",

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 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.",

keywords = "Gravitational lensing: weak, Planets and satellites: detection, Planetary systems, Galaxy: bulge, Binary, Dwarf, Mass, Lens, Stars, Algorithm, Discovery, Frequency, Systems, Search",

author = "No{\'e} Kains and Street, {R. A.} and Choi, {J. -Y.} and C. Han and A. Udalski and Almeida, {L. A.} and F. Jablonski and Tristram, {P. J.} and Jorgensen, {U. G.} and Szymanski, {M. K.} and M. Kubiak and G. Pietrzynski and I. Soszynski and R. Poleski and S. Kozlowski and P. Pietrukowicz and K. Ulaczyk and L. Wyrzykowski and J. Skowron and Alsubai, {K. A.} and V. Bozza and P. Browne and Burgdorf, {M. J.} and {Calchi Novati}, S. and P. Dodds and M. Dominik and S. Dreizler and Fang, {X. -S.} and F. Grundahl and C-H. Gu and S. Hardis and K. Harpsoe and Hessman, {F. V.} and Hinse, {T. C.} and A. Hornstrup and M. Hundertmark and J. Jessen-Hansen and E. Kerins and C. Liebig and M. Lund and M. Lundkvist and L. Mancini and M. Mathiasen and Penny, {M. T.} and S. Rahvar and D. Ricci and Sahu, {K. C.} and G. Scarpetta and J. Skottfelt and C. Snodgrass and J. Southworth and J. Surdej and J. Tregloan-Reed and J. Wambsganss and O. Wertz and D. Bajek and Bramich, {D. M.} and K. Horne and S. Ipatov and Steele, {I. A.} and Y. Tsapras and F. Abe and Bennett, {D. P.} and Bond, {I. A.} and Botzler, {C. S.} and P. Chote and M. Freeman and A. Fukui and K. Furusawa and Y. Itow and Ling, {C. H.} and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and K. Ohnishi and N. Rattenbury and T. Saito and Sullivan, {D. J.} and T. Sumi and D. Suzuki and K. Suzuki and Sweatman, {W. L.} and S. Takino and K. Wada and Yock, {P. C. M.} and W. Allen and V. Batista and Chung, {S. -J.} and G. Christie and DePoy, {D. L.} and J. Drummond and Gaudi, {B. S.} and A. Gould and C. Henderson and Jung, {Y. -K.} and Koo, {J. -R.} and Lee, {C. -U.} and J. McCormick and D. McGregor and Munoz, {J. A.} and T. Natusch and H. Ngan and H. Park and Pogge, {R. W.} and Shin, {I. -G.} and J. Yee and Albrow, {M. D.} and E. Bachelet and Beaulieu, {J. -P.} and S. Brillant and Caldwell, {J. A. R.} and A. Cassan and A. Cole and E. Corrales and Ch. Coutures and S. Dieters and Prester, {D. Dominis} and J. Donatowicz and P. Fouque and J. Greenhill and Kane, {S. R.} and D. Kubas and Marquette, {J. -B.} and R. Martin and P. Meintjes and J. Menzies and Pollard, {K. R.} and A. Williams and D. Wouters and M. Zub",

note = "N.K. acknowledges an ESO Fellowship. The research leading to these results has received funding from the European Community{\textquoteright}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{\textquoteright}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 Communaut{\'e} fran{\c c}aise de Belgique – Actions de recherche concert{\'e}es – Acad{\'e}mie 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.",

year = "2013",

month = apr,

doi = "10.1051/0004-6361/201220626",

language = "English",

volume = "552",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP SCIENCES S A",

}

Kains, N, Street, RA, Choi, J-Y, Han, C, Udalski, A, Almeida, LA, Jablonski, F, Tristram, PJ, Jorgensen, UG, Szymanski, MK, Kubiak, M, Pietrzynski, G, Soszynski, I, Poleski, R, Kozlowski, S, Pietrukowicz, P, Ulaczyk, K, Wyrzykowski, L, Skowron, J, Alsubai, KA, Bozza, V, Browne, P, Burgdorf, MJ, Calchi Novati, S, Dodds, P, Dominik, M, Dreizler, S, Fang, X-S, Grundahl, F, Gu, C-H, Hardis, S, Harpsoe, K, Hessman, FV, Hinse, TC, Hornstrup, A, Hundertmark, M, Jessen-Hansen, J, Kerins, E, Liebig, C, Lund, M, Lundkvist, M, Mancini, L, Mathiasen, M, Penny, MT, Rahvar, S, Ricci, D, Sahu, KC, Scarpetta, G, Skottfelt, J, Snodgrass, C, Southworth, J, Surdej, J, Tregloan-Reed, J, Wambsganss, J, Wertz, O, Bajek, D, Bramich, DM, Horne, K, Ipatov, S, Steele, IA, Tsapras, Y, Abe, F, Bennett, DP, Bond, IA, Botzler, CS, Chote, P, Freeman, M, Fukui, A, Furusawa, K, Itow, Y, Ling, CH, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Ohnishi, K, Rattenbury, N, Saito, T, Sullivan, DJ, Sumi, T, Suzuki, D, Suzuki, K, Sweatman, WL, Takino, S, Wada, K, Yock, PCM, Allen, W, Batista, V, Chung, S-J, Christie, G, DePoy, DL, Drummond, J, Gaudi, BS, Gould, A, Henderson, C, Jung, Y-K, Koo, J-R, Lee, C-U, McCormick, J, McGregor, D, Munoz, JA, Natusch, T, Ngan, H, Park, H, Pogge, RW, Shin, I-G, Yee, J, Albrow, MD, Bachelet, E, Beaulieu, J-P, Brillant, S, Caldwell, JAR, Cassan, A, Cole, A, Corrales, E, Coutures, C, Dieters, S, Prester, DD, Donatowicz, J, Fouque, P, Greenhill, J, Kane, SR, Kubas, D, Marquette, J-B, Martin, R, Meintjes, P, Menzies, J, Pollard, KR, 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. https://doi.org/10.1051/0004-6361/201220626

TY - JOUR

T1 - A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251

AU - Kains, Noé

AU - Street, R. A.

AU - Choi, J. -Y.

AU - Han, C.

AU - Udalski, A.

AU - Almeida, L. A.

AU - Jablonski, F.

AU - Tristram, P. J.

AU - Jorgensen, U. G.

AU - Szymanski, M. K.

AU - Kubiak, M.

AU - Pietrzynski, G.

AU - Soszynski, I.

AU - Poleski, R.

AU - Kozlowski, S.

AU - Pietrukowicz, P.

AU - Ulaczyk, K.

AU - Wyrzykowski, L.

AU - Skowron, J.

AU - Alsubai, K. A.

AU - Bozza, V.

AU - Browne, P.

AU - Burgdorf, M. J.

AU - Calchi Novati, S.

AU - Dodds, P.

AU - Dominik, M.

AU - Dreizler, S.

AU - Fang, X. -S.

AU - Grundahl, F.

AU - Gu, C-H.

AU - Hardis, S.

AU - Harpsoe, K.

AU - Hessman, F. V.

AU - Hinse, T. C.

AU - Hornstrup, A.

AU - Hundertmark, M.

AU - Jessen-Hansen, J.

AU - Kerins, E.

AU - Liebig, C.

AU - Lund, M.

AU - Lundkvist, M.

AU - Mancini, L.

AU - Mathiasen, M.

AU - Penny, M. T.

AU - Rahvar, S.

AU - Ricci, D.

AU - Sahu, K. C.

AU - Scarpetta, G.

AU - Skottfelt, J.

AU - Snodgrass, C.

AU - Southworth, J.

AU - Surdej, J.

AU - Tregloan-Reed, J.

AU - Wambsganss, J.

AU - Wertz, O.

AU - Bajek, D.

AU - Bramich, D. M.

AU - Horne, K.

AU - Ipatov, S.

AU - Steele, I. A.

AU - Tsapras, Y.

AU - Abe, F.

AU - Bennett, D. P.

AU - Bond, I. A.

AU - Botzler, C. S.

AU - Chote, P.

AU - Freeman, M.

AU - Fukui, A.

AU - Furusawa, K.

AU - Itow, Y.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Miyake, N.

AU - Muraki, Y.

AU - Ohnishi, K.

AU - Rattenbury, N.

AU - Saito, T.

AU - Sullivan, D. J.

AU - Sumi, T.

AU - Suzuki, D.

AU - Suzuki, K.

AU - Sweatman, W. L.

AU - Takino, S.

AU - Wada, K.

AU - Yock, P. C. M.

AU - Allen, W.

AU - Batista, V.

AU - Chung, S. -J.

AU - Christie, G.

AU - DePoy, D. L.

AU - Drummond, J.

AU - Gaudi, B. S.

AU - Gould, A.

AU - Henderson, C.

AU - Jung, Y. -K.

AU - Koo, J. -R.

AU - Lee, C. -U.

AU - McCormick, J.

AU - McGregor, D.

AU - Munoz, J. A.

AU - Natusch, T.

AU - Ngan, H.

AU - Park, H.

AU - Pogge, R. W.

AU - Shin, I. -G.

AU - Yee, J.

AU - Albrow, M. D.

AU - Bachelet, E.

AU - Beaulieu, J. -P.

AU - Brillant, S.

AU - Caldwell, J. A. R.

AU - Cassan, A.

AU - Cole, A.

AU - Corrales, E.

AU - Coutures, Ch.

AU - Dieters, S.

AU - Prester, D. Dominis

AU - Donatowicz, J.

AU - Fouque, P.

AU - Greenhill, J.

AU - Kane, S. R.

AU - Kubas, D.

AU - Marquette, J. -B.

AU - Martin, R.

AU - Meintjes, P.

AU - Menzies, J.

AU - Pollard, K. R.

AU - Williams, A.

AU - Wouters, D.

AU - Zub, M.

N1 - 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.

PY - 2013/4

Y1 - 2013/4

N2 - 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.

AB - 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.

KW - Gravitational lensing: weak

KW - Planets and satellites: detection

KW - Planetary systems

KW - Galaxy: bulge

KW - Binary

KW - Dwarf

KW - Mass

KW - Lens

KW - Stars

KW - Algorithm

KW - Discovery

KW - Frequency

KW - Systems

KW - Search

U2 - 10.1051/0004-6361/201220626

DO - 10.1051/0004-6361/201220626

M3 - Article

SN - 0004-6361

VL - 552

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A70

ER -

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

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Keywords

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