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OGLE-2012-BLG-0563Lb : a Saturn-mass planet around an M dwarf with the mass constrained by Subaru AO imaging

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Dominik_2015_TAJ_OGLE.pdf (1.306Mb)
Date
11/08/2015
Author
Fukui, A.
Gould, A.
Sumi, T.
Bennett, D. P.
Bond, I. A.
Han, C.
Suzuki, D.
Beaulieu, J.-P.
Batista, V.
Udalski, A.
Street, R. A.
Tsapras, Y.
Hundertmark, Markus Peter Gerhard
Abe, F.
Bhattacharya, A.
Freeman, M.
Itow, Y.
Ling, C. H.
Koshimoto, N.
Masuda, K.
Matsubara, Y.
Muraki, Y.
Ohnishi, K.
Philpott, L. C.
Rattenbury, N.
Saito, T.
Sullivan, D. J.
Tristram, P. J.
Yonehara, A.
Choi, J.-Y.
Christie, G. W.
DePoy, D. L.
Dong, Subo
Drummond, J.
Gaudi, B. S.
Hwang, K.-H.
Kavka, A.
Lee, C.-U.
McCormick, J.
Natusch, T.
Ngan, H.
Park, H.
Pogge, R. W.
Shin, I.-G.
Tan, T.-G.
Yee, J. C.
Szymański, M. K.
Pietrzyński, G.
Soszyński, I.
Poleski, R.
Kozłowski, S.
Pietrukowicz, P.
Ulaczyk, K.
Wyrzykowski, Ł.
Bramich, D. M.
Browne, Paul
Dominik, Martin
Horne, Keith Douglas
Ipatov, S.
Kains, N.
Snodgrass, C.
Steele, I. A.
Funder
The Royal Society
Science & Technology Facilities Council
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
UF100010 / UF130581
ST/J001651/1
ST/K001515/1
ST/M001296/1
Keywords
Planetary systems
Planets and satellites: detection
Planets and satellites: gaseous planets
Stars: late-type
Techniques: high angular resolution
Techniques: photometric
QB Astronomy
QC Physics
NDAS
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Abstract
We report the discovery of a microlensing exoplanet OGLE-2012-BLG-0563Lb with the planet–star mass ratio of ∼1 x 10-3. Intensive photometric observations of a high-magnification microlensing event allow us to detect a clear signal of the planet. Although no parallax signal is detected in the light curve, we instead succeed at detecting the flux from the host star in high-resolution JHK'-band images obtained by the Subaru/AO188 and Infrared Camera and Spectrograph instruments, allowing us to constrain the absolute physical parameters of the planetary system. With the help of spectroscopic information about the source star obtained during the high-magnification state by Bensby et al., we find that the lens system is located at 1.3-0.8+0.6 kpc from us, and consists of an M dwarf (0.34+0.12-0.20MΘ) orbited by a Saturn-mass planet (0.39-0.23+0.14 MJup) at the projected separation of 0.74-0.42+0.26 AU (close model) or 4.3-2.5+1.5 AU (wide model). The probability of contamination in the host star's flux, which would reduce the masses by a factor of up to three, is estimated to be 17%. This possibility can be tested by future high-resolution imaging. We also estimate the (J-Ks) and (H-Ks) colors of the host star, which are marginally consistent with a low metallicity mid-to-early M dwarf, although further observations are required for the metallicity to be conclusive. This is the fifth sub-Jupiter-mass (0.2 < mp/MJup < 1) microlensing planet around an M dwarf with the mass well constrained. The relatively rich harvest of sub-Jupiters around M dwarfs is contrasted with a possible paucity of ~1–2 Jupiter-mass planets around the same type of star, which can be explained by the planetary formation process in the core-accretion scheme.
Citation
Fukui , A , Gould , A , Sumi , T , Bennett , D P , Bond , I A , Han , C , Suzuki , D , Beaulieu , J-P , Batista , V , Udalski , A , Street , R A , Tsapras , Y , Hundertmark , M P G , Abe , F , Bhattacharya , A , Freeman , M , Itow , Y , Ling , C H , Koshimoto , N , Masuda , K , Matsubara , Y , Muraki , Y , Ohnishi , K , Philpott , L C , Rattenbury , N , Saito , T , Sullivan , D J , Tristram , P J , Yonehara , A , Choi , J-Y , Christie , G W , DePoy , D L , Dong , S , Drummond , J , Gaudi , B S , Hwang , K-H , Kavka , A , Lee , C-U , McCormick , J , Natusch , T , Ngan , H , Park , H , Pogge , R W , Shin , I-G , Tan , T-G , Yee , J C , Szymański , M K , Pietrzyński , G , Soszyński , I , Poleski , R , Kozłowski , S , Pietrukowicz , P , Ulaczyk , K , Wyrzykowski , Ł , Bramich , D M , Browne , P , Dominik , M , Horne , K D , Ipatov , S , Kains , N , Snodgrass , C & Steele , I A 2015 , ' OGLE-2012-BLG-0563Lb : a Saturn-mass planet around an M dwarf with the mass constrained by Subaru AO imaging ' , Astrophysical Journal , vol. 809 , no. 1 . https://doi.org/10.1088/0004-637X/809/1/74
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.1088/0004-637X/809/1/74
ISSN
0004-637X
Type
Journal article
Rights
© 2015. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at http://dx.doi.org/10.1088/0004-637X/809/1/74
Description
A.F. was supported by the Astrobiology Project of the Center for Novel Science Initiatives (CNSI), National Institutes of Natural Sciences (NINS; Grant Number AB261005). T.S. acknowledges the financial support from the JSPS, JSPS23103002, JSPS24253004, and JSPS26247023. The MOA project is supported by grants JSPS25103508 and 23340064. NJR is a Royal Society of New Zealand Rutherford Discovery Fellow. Work by C.H. was supported by Creative Research Initiative Program (2009-0081561) of National Research Foundation of Korea. S.D. is supported by "the Strategic Priority Research Program—The Emergence of Cosmological Structures" of the Chinese Academy of Sciences (grant No. 09000000). The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. C.S. received funding from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement No. 268421. K.A., D.M.B., M.D., K.H., M.H., C.L., C.S., R.A.S., and Y.T. would like to thank the Qatar Foundation for support from QNRF grant NPRP-09-476-1-078.
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  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2015ApJ...809...74F
URI
http://hdl.handle.net/10023/7562

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