Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
Fukui,A.1,2; Suzuki,D.3; Koshimoto,N.4,5,6; Bachelet,E.7; Vanmunster,T.8; Storey,D.9; Maehara,H.10; Yanagisawa,K.11; Yamada,T.12; Yonehara,A.12; Hirano,T.13; Bennett,D. P.6,14; Bozza,V.15,16; Mawet,D.17,18; Penny,M. T.19; Awiphan,S.20; Oksanen,A.9,21; Heintz,T. M.22,23; Oberst,T. E.23; Béjar,V. J. S.2,24; Casasayas-Barris,N.2,24; Chen,G.2,25; Crouzet,N.2,24,26; Hidalgo,D.2,24; Klagyivik,P.2,24; Murgas,F.2,24; Narita,N.2,5,27,28; Palle,E.2,24; Parviainen,H.2,24; Watanabe,N.5,29; Kusakabe,N.5,27; Mori,M.4; Terada,Y.4; Leon,J. P. de4; Hernandez,A.2,24; Luque,R.2,24; Monelli,M.2,24; Monta?es-Rodriguez,P.2,24; Prieto-Arranz,J.2,24; Murata,K. L.30; Shugarov,S.31,32; Kubota,Y.12; Otsuki,C.12; Shionoya,A.12; Nishiumi,T.5,12; Nishide,A.12; Fukagawa,M.5; Onodera,K.3,33,34,35; Villanueva,S.36; Street,R. A.7; Tsapras,Y.37; Hundertmark,M.37; Kuzuhara,M.27; Fujita,M.13; Beichman,C.18,38,39; Beaulieu,J.-P.40,41; Alonso,R.2,24; Reichart,D. E.42; Kawai,N.30; Tamura,M.4,5,27
Source PublicationThe Astronomical Journal
AbstractAbstract We report the analysis of additional multiband photometry and spectroscopy and new adaptive optics (AO) imaging of the nearby planetary microlensing event TCP?J05074264+2447555 (Kojima-1), which was discovered toward the Galactic anticenter in 2017 (Nucita et al.). We confirm the planetary nature of the light-curve anomaly around the peak while finding no additional planetary feature in this event. We also confirm the presence of apparent blending flux and the absence of significant parallax signal reported in the literature. The AO image reveals no contaminating sources, making it most likely that the blending flux comes from the lens star. The measured multiband lens flux, combined with a constraint from the microlensing model, allows us to narrow down the previously unresolved mass and distance of the lens system. We find that the primary lens is a dwarf on the K/M boundary (0.581 ± 0.033 M⊙) located at 505?±?47 pc, and the companion (Kojima-1Lb) is a Neptune-mass planet (20.0 ± 2.0 M⊕) with a semimajor axis of au. This orbit is a few times smaller than those of typical microlensing planets and is comparable to the snow-line location at young ages. We calculate that the a priori detection probability of Kojima-1Lb is only ~35%, which may imply that Neptunes are common around the snow line, as recently suggested by the transit and radial velocity techniques. The host star is the brightest among the microlensing planetary systems (Ks = 13.7), offering a great opportunity to spectroscopically characterize this system, even with current facilities.
KeywordGravitational microlensing Exoplanet systems
WOS IDIOP:0004-6256-158-5-ab487f
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
2.Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
3.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan
4.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
5.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
6.Code 667, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
7.Las Cumbres Observatory, 6740 Cortona Drive, Suite 102, Goleta, CA 93117, USA
8.Center for Backyard Astrophysics Belgium, Walhostraat 1A, B-3401 Landen, Belgium
9.American Association of Variable Star Observers, 49 Bay State Road, Cambridge, MA 02138, USA
10.Okayama Branch Office, Subaru Telescope, National Astronomical Observatory of Japan, NINS, Kamogata, Asakuchi, Okayama 719-0232, Japan
11.Division of Optical and Infrared Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka-shi, Tokyo 181-8588, Japan
12.Department of Astrophysics and Atmospheric Sciences, Faculty of Science, Kyoto Sangyo University, 603-8555 Kyoto, Japan
13.Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
14.Department of Astronomy, University of Maryland, College Park, MD 20742, USA
15.Dipartimento di Fisica “E.R. Caianiello,” Universitá di Salerno, Via Giovanni Paolo II 132, I-84084, Fisciano, Italy
16.Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Via Cintia, I-80126 Napoli, Italy
17.Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
18.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
19.Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
20.National Astronomical Research Institute of Thailand, 260, Moo 4, T. Donkaew, A. Mae Rim, Chiang Mai, 50180, Thailand
21.Hankasalmi Observatory, Hankasalmi, Finland
22.Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA
23.Department of Physics, Westminster College, New Wilmington, PA 16172, USA
24.Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
25.Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
26.European Space Agency, European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
27.Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
28.JST, PRESTO, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
29.SOKENDAI (The Graduate University of Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
30.Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
31.Sternberg Astronomical Institute, Moscow State University, Moscow 119991, Russia
32.Astronomical Institute of the Slovak Academy of Sciences, Tatranska Lomnica, 05960, Slovakia
33.Department of Space and Astronautical Science, SOKENDAI (The Graduate University for Advanced Studies), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan
34.Institut de Physique du Globe de Paris, 1 Rue Jussieu, F-75005 Paris, France
35.Université Paris Diderot, 5 Rue Thomas Mann, F-75013 Paris, France
36.Kavli Institute for Astrophysics and Space Research, M.I.T., Cambridge, MA 02139, USA
37.Zentrum für Astronomie der Universit?t Heidelberg, Astronomisches Rechen-Institut, M?nchhofstr. 12-14, D-69120 Heidelberg, Germany
38.Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
39.NASA Exoplanet Science Institute, 770 South Wilson Avenue, Pasadena, CA 911225, USA
40.School of Physical Sciences, University of Tasmania, Private Bag 37 Hobart, Tasmania 7001, Australia
41.Sorbonne Universites, CNRS, UPMC Univ Paris 06, UMR 7095, Institut dAstrophysique de Paris, F-75014, Paris, France
42.Department of Physics and Astronomy, University of North Carolina, CB #3255, Chapel Hill, NC 27599, USA
Recommended Citation
GB/T 7714
Fukui,A.,Suzuki,D.,Koshimoto,N.,et al. Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star[J]. The Astronomical Journal,2019,158(5).
APA Fukui,A..,Suzuki,D..,Koshimoto,N..,Bachelet,E..,Vanmunster,T..,...&Tamura,M..(2019).Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star.The Astronomical Journal,158(5).
MLA Fukui,A.,et al."Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star".The Astronomical Journal 158.5(2019).
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