Issue |
A&A
Volume 552, April 2013
|
|
---|---|---|
Article Number | A70 | |
Number of page(s) | 10 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/201220626 | |
Published online | 27 March 2013 |
A giant planet beyond the snow line in microlensing event OGLE-2011-BLG-0251
1
European Southern Observatory, Karl-Schwarzschild Straße 2, 85748
Garching bei München,
Germany
2
Las Cumbres Observatory Global Telescope Network,
6740 Cortona Drive, Suite 102,
Goleta, CA
93117,
USA
3
Department of Physics, Institute for Astrophysics, Chungbuk
National University, 371-763
Cheongju,
Korea
4
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478
Warszawa,
Poland
5
Divisão de Astrofisica, Instituto Nacional de Pesquisas
Espeaciais, Avenida dos
Astronauntas, 1758 Sao José dos Campos, 12227-010
SP,
Brazil
6
School of Chemical and Physical Sciences, Victoria
University, Wellington, New Zealand
7
Niels Bohr Institute, University of Copenhagen,
Juliane Maries vej 30,
2100
Copenhagen,
Denmark
8
Centre for Star and Planet Formation, Geological
Museum, Øster Voldgade
5, 1350
Copenhagen,
Denmark
9
Qatar Foundation, PO Box 5825, Doha, Qatar
10
Dipartimento di Fisica “E.R Caianiello”, Università di
Salerno, via Ponte Don
Melillo, 84084
Fisciano,
Italy
11
Istituto Nazionale di Fisica Nucleare,
Sezione di Napoli,
Italy
12
SUPA School of Physics & Astronomy, University of St
Andrews, North
Haugh, St Andrews,
KY16 9SS,
UK
13
Deutsches SOFIA Institut, Universität Stuttgart,
Pfaffenwaldring 31,
70569
Stuttgart,
Germany
14
SOFIA Science Center, NASA Ames Research Center, Mail Stop
N211-3, Moffett Field
CA
94035,
USA
15
Istituto Internazionale per gli Alti Studi Scientifici
(IIASS), Vietri Sul
Mare ( SA),
Italy
16
Institut für Astrophysik, Georg-August-Universität,
Friedrich-Hund-Platz 1,
37077
Göttingen,
Germany
17
Korea Astronomy and Space Science Institute,
305-348
Daejeon,
Korea
18
National Astronomical Observatories/Yunnan Observatory, Joint
laboratory for Optical Astronomy, Chinese Academy of Sciences,
650011
Kunming, PR
China
19
Department of Physics and Astronomy, Aarhus
University, Ny Munkegade
120, 8000
Århus C,
Denmark
20
Armagh Observatory, College Hill, Armagh, BT61 9DG, Northern Ireland, UK
21
Danmarks Tekniske Universitet, Institut for Rumforskning og
-teknologi, Juliane Maries Vej
30, 2100
København,
Denmark
22
Jodrell Bank Centre for Astrophysics, University of
Manchester, Oxford
Road, Manchester,
M13 9PL,
UK
23
Max Planck Institute for Astronomy, Königstuhl 17, 69117
Heidelberg,
Germany
24
Department of Astronomy, Ohio State University,
140 West 18th Avenue,
Columbus, OH
43210,
USA
25
Department of Physics, Sharif University of
Technology, PO Box
11155–9161, Tehran,
Iran
26
Perimeter Institute for Theoretical Physics,
31 Caroline St. N.,
Waterloo ON, N2L 2Y5, Canada
27
Institut d’Astrophysique et de Géophysique,
Allée du 6 Août 17, Sart Tilman, Bât.
B5c, 4000
Liège,
Belgium
28
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD
21218,
USA
29
INFN, Gruppo Collegato di Salerno, Sezione di Napoli,
Italy
30
European Southern Observatory (ESO), Alonso de Cordova 3107, Casilla 19001,
Santiago 19,
Chile
31
Max Planck Institute for Solar System Research,
Max-Planck-Str. 2, 37191
Katlenburg-Lindau,
Germany
32
Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
33
Astronomisches Rechen-Institut, Zentrum für Astronomie der
Universität Heidelberg (ZAH), Mönchhofstr. 12-14, 69120
Heidelberg,
Germany
34
Institute of Astronomy, University of Cambridge,
Madingley Road, Cambridge
CB3 0HA,
UK
35
Alsubais Establishment for Scientific Studies,
Doha,
Qatar
36
Astrophysics Research Institute, Liverpool John Moores
University, Twelve Quays House,
Egerton Wharf, Birkenhead, Wirral., CH41
1LD, UK
37
School of Mathematical Sciences, Queen Mary, University of
London, Mile End
Road, London
E1 4NS,
UK
38
Vintage Lane Observatory, 83 Vintage Lane, RD3, Blenheim, New
Zealand
39
Auckland Observatory, 670 Manukau Rd, Royal Oak 1023, Auckland, New
Zealand
40
Dept. of Physics and Astronomy, Texas A&M University
College Station, TX
77843-4242, USA
41
Possum Observatory, Patutahi, Gisbourne, New Zealand
42
Farm Cove Observatory, Centre for Backyard Astrophysics,
Pakuranga, Auckland,
New Zealand
43
Institute for Radiophysics and SpaceResearch, AUT
University, Auckland,
New Zealand
44
Dept. of Astronomy and Space Science, Chungnam
University, Korea
45
Departamento de Astronomiá y Astrofísica, Universidad de
Valencia, 46100
Burjassot, Valencia, Spain
46
UPMC-CNRS, UMR7095, Institut d’Astrophysique de
Paris, 98bis boulevard
Arago, 75014
Paris,
France
47
University of Canterbury, Dept. of Physics and
Astronomy, Private Bag
4800, 8020
Christchurch, New
Zealand
48
McDonald Observatory, 16120 St Hwy Spur 78 #2, Fort Davis, Tx
79734,
USA
49
University of the Free State, Faculty of Natural and Agricultural
Sciences, Dept. of Physics, PO Box
339, 9300
Bloemfontein, South
Africa
50
School of Math and Physics, University of Tasmania,
Private Bag 37, GPO Hobart,
7001
Tasmania,
Australia
51
Institute of Geophysics and Planetary Physics (IGPP), L-413,
Lawrence Livermore National Laboratory, PO Box 808, Livermore, CA
94551,
USA
52
Université de Toulouse, UPS-OMP, IRAP,
31400
Toulouse,
France
53
CNRS, IRAP, 14
avenue Edouard Belin, 31400
Toulouse,
France
54
Physics Department, Faculty of Arts and Sciences, University of
Rijeka, Omladinska
14, 51000
Rijeka,
Croatia
55
Technical University of Vienna, Department of
Computing, Wiedner Hauptstrasse
10, Vienna,
Austria
56
NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 S. Wilson Ave.,
Pasadena, CA
91125,
USA
57
Perth Observatory, Walnut Road, Bickley,
6076
Perth,
Australia
58
South African Astronomical Observatory,
PO Box 9, Observatory
7935, South
Africa
59
Solar-Terrestrial Environment Laboratory, Nagoya
University, 464-8601
Nagoya,
Japan
60
Dept. of Physics, University of Notre Dame,
Notre Dame, IN
46556,
USA
61
Institute of Information and Mathematical Sciences, Massey
University, Private Bag 102-904,
North Shore Mail Centre, Auckland, New Zealand
62
Dept. of Physics, University of Auckland,
Private Bag 92019, Auckland, New
Zealand
63
Okayama Astrophysical Observatory, National Astronomical
Observatory of Japan, Asakuchi, 719-0232
Okayama,
Japan
64
Mt. John Observatory, PO Box 56, 8770
Lake Tekapo, New
Zealand
65
Dept. of Physics, Konan University, Nishiokamoto 8-9-1, 658-8501
Kobe,
Japan
66
Nagano National College of Technology,
381-8550
Nagano,
Japan
67
Tokyo Metropolitan College of Industrial Technology,
116-8523
Tokyo,
Japan
68
Dept. of Earth and Space Science, Graduate School of Science,
Osaka University, 1-1
Machikaneyama-cho, Toyonaka, 560-0043
Osaka,
Japan
69
Universidad de Concepción, Departamento de
Astronomia, Casilla
160–C, Concepción,
Chile
Received:
24
October
2012
Accepted:
1
March
2013
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.
Key words: gravitational lensing: weak / planets and satellites: detection / planetary systems / Galaxy: bulge
© ESO, 2013
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