OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf
Nagakane,M.1; Lee,Chien-Hsiu2; Koshimoto,N.3,4; Suzuki,D.5; Udalski,A.6; Beaulieu,J. P.7; Sumi,T.1; Bennett,D. P.8,9; Bond,I. A.10; Rattenbury,N.11; Bachelet,E.12; Dominik,M.13; Abe,F.14; Barry,R. K.8; Bhattacharya,A.8,9; Donachie,M.11; Fujii,H.14; Fukui,A.3,15; Hirao,Y.1; Itow,Y.14; Kamei,Y.14; Kondo,I.1; Li,M. C. A.11; Matsubara,Y.14; Matsuo,T.1; Miyazaki,S.1; Muraki,Y.14; Ranc,C.8; Shibai,H.1; Suematsu,H.1; Sullivan,D. J.16; Tristram,P. J.17; Yamakawa,T.14; Yonehara,A.18; Mróz,P.6; Poleski,R.6,19; Skowron,J.6; Szymański,M. K.6; Soszyński,I.6; Pietrukowicz,P.6; Koz?owski,S.6; Ulaczyk,K.6,20; Bramich,D. M.21,22,23; Cassan,A.24; Jaimes,R. Figuera25; Horne,K.26; Hundertmark,M.27; Mao,S.28,29; Menzies,J.30; Schmidt,R.27; Snodgrass,C.31,32; Steele,I. A.33; Street,R.12; Tsapras,Y.27; Wambsganss,J.27,34; J?rgensen,U. G.35; Bozza,V.36,37; Long?,P.38; Peixinho,N.38,39; Skottfelt,J.31; Southworth,J.40; Andersen,M. I.41; Burgdorf,M. J.42; D’Ago,G.43; Evans,D. F.40; Hinse,T. C.44; Korhonen,H.41; Rabus,M.45,46; Rahvar,S.47
Source PublicationThe Astronomical Journal
AbstractAbstract We report the discovery of an exoplanet from the analysis of the gravitational microlensing event OGLE-2015-BLG-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. The planet/host-star mass ratio is q?=?7.2?×?10?3 and the projected separation normalized to the angular Einstein radius is s?=?0.9. We conducted high-resolution follow-up observations using the Infrared Camera and Spectrograph (IRCS) camera on the Subaru telescope and are able to place an upper limit on the lens flux. From these measurements we are able to exclude all host stars greater than or equal in mass to a G-type dwarf. We conducted a Bayesian analysis with these new flux constraints included as priors resulting in estimates of the masses of the host star and planet. These are ML?=?0.34?±?0.19?M⊙ and , respectively. The distance to the system is . The projected star–planet separation is . The estimated relative lens-source proper motion, ~7.1?mas yr?1, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event.
KeywordGravitational microlensing Exoplanet astronomy
WOS IDIOP:0004-6256-158-5-ab4881
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
2.650 N Aohoku Pl. Hilo, HI 96720, USA
3.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
4.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
5.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan
6.Astronomical Observatory, University of Warsaw, Al.?Ujazdowskie?4,00-478?Warszawa, Poland
7.Sorbonne Universités, CNRS, UPMC Univ Paris 06, UMR 7095, Institut d’Astrophysique de Paris, F-75014, Paris, France
8.Laboratory for Exoplanets and Stellar Astrophysics, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
9.Department of Astronomy, University of Maryland, College Park, MD 20742, USA
10.Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
11.Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
12.Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Goleta, CA 93117, USA
13.Centre for Exoplanet Science, SUPA, School of Physics & Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, UK
14.Institute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, Japan
15.Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
16.School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
17.University of Canterbury Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
18.Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan
19.Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH?43210,?USA
20.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4?7AL,?UK
21.Center for Space Science, NYUAD Institute, New York University Abu Dhabi, P.O. Box 129188, Saadiyat Island, Abu Dhabi, UAE
22.Division of Science, New York University Abu Dhabi, P.O. Box 129188, Saadiyat Island, Abu Dhabi, UAE
23.Division of Engineering, New York University Abu Dhabi, P.O. Box 129188, Saadiyat Island, Abu Dhabi, UAE
24.Institut d’Astrophysique de Paris, Sorbonne Université, CNRS, UMR 7095, 98 bis bd Arago, F-75014 Paris, France
25.Facultad de Ingenieria y Tecnologia Universidad San Sebastian, General Lagos 1163, Valdivia 5110693, Chile
26.SUPA, University of St. Andrews, School of Physics & Astronomy, North Haugh, St. Andrews, KY16 9SS, UK
27.Zentrum für Astronomie der Universit?t Heidelberg, Astronomisches Rechen-Institut, M?nchhofstr. 12-14, D-69120 Heidelberg, Germany
28.Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People’s Republic of China
29.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China
30.South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
31.Planetary and Space Sciences, Department of Physical Sciences, The Open University, Milton Keynes, MK7 6AA, UK
32.Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
33.Astrophysics Research Institute, Liverpool John Moores University, Liverpool CH41 1LD, UK
34.International Space Science Institute (ISSI), Haller-strasse 6, 3012 Bern, Switzerland
35.Niels Bohr Institute & Centre for Star and Planet Formation, University of Copenhagen, ?ster Voldgade 5, DK-1350 Copenhagen, Denmark
36.Dipartimento di Fisica “E.R. Caianiello,” Universitá di Salerno, Via Giovanni Paolo II 132, I-84084, Fisciano, Italy
37.Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy
38.Centro de Astronomía (CITEVA), Universidad de Antofagasta, Avda. U. de Antofagasta 02800, Antofagasta, Chile
39.CITEUC—Center for Earth and Space Research of the University of Coimbra, Geophysical and Astronomical Observatory, R. Observatório s/n, 3040-004 Coimbra, Portugal
40.Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK
41.Niels Bohr Institute, Juliane Maries vej 30, DK-2100 Copenhagen, Denmark
42.Universit?t Hamburg, Faculty of Mathematics, Informatics and Natural Sciences, Department of Earth Sciences, Meteorological Institute, Bundesstra?e 55, D-20146 Hamburg, Germany
43.Centro de Astroingeniería, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicu?a Mackenna 4860, Macul 7820436, Santiago, Chile
44.Chungnam National University, Department of Astronomy and Space Science, 34134 Daejeon, Republic of Korea
45.Las Cumbres Observatory Global Telescope, 6740 Cortona Drive, Suite 102, Goleta, CA 93111, USA
46.Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA
47.Department of Physics, Sharif University of Technology, P.O. Box 11155-9161 Tehran, Iran
Recommended Citation
GB/T 7714
Nagakane,M.,Lee,Chien-Hsiu,Koshimoto,N.,et al. OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf[J]. The Astronomical Journal,2019,158(5).
APA Nagakane,M..,Lee,Chien-Hsiu.,Koshimoto,N..,Suzuki,D..,Udalski,A..,...&Rahvar,S..(2019).OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf.The Astronomical Journal,158(5).
MLA Nagakane,M.,et al."OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf".The Astronomical Journal 158.5(2019).
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