| Title | OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing |
| Authors | Li, S. -S. Zang, W. Udalski, A. Shvartzvald, Y. Huber, D. Lee, C. -U. Sumi, T. Gould, A. Mao, S. Fouque, P. Wang, T. Dong, S. Jorgensen, U. G. Cole, A. Mroz, P. Szymanski, M. K. Skowron, J. Poleski, R. Soszynski, I. Pietrukowicz, P. Kozlowski, S. Ulaczyk, K. Rybicki, K. A. Iwanek, P. Yee, J. C. Novati, S. Calchi Beichman, C. A. Bryden, G. Carey, S. Gaudi, B. S. Henderson, C. B. Zhu, W. Albrow, M. D. Chung, S. -J. Han, C. Hwang, K. -H. Jung, Y. K. Ryu, Y. -H. Shin, I. -G. Cha, S. -M. Kim, D. -J. Kim, H. -W. Kim, S. -L. Lee, D. -J. Lee, Y. Park, B. -G. Pogge, R. W. Bond, I. A. Abe, F. Barry, R. Bennett, D. P. Bhattacharya, A. Donachie, M. Fukui, A. Hirao, Y. Itow, Y. Kondo, I. Koshimoto, N. Li, M. C. A. Matsubara, Y. Muraki, Y. Miyazaki, S. Nagakane, M. Ranc, C. Rattenbury, N. J. Suematsu, H. Sullivan, D. J. Suzuki, D. Tristram, P. J. Yonehara, A. Christie, G. Drummond, J. Green, J. Hennerley, S. Natusch, T. Porritt, I. Bachelet, E. Maoz, D. Street, R. A. Tsapras, Y. Bozza, V. Dominik, M. Hundertmark, M. Peixinho, N. Sajadian, S. Burgdorf, M. J. Evans, D. F. Jaimes, R. Figuera Fujii, Y. I. Haikala, L. K. Helling, C. Henning, T. Hinse, T. C. Mancini, L. Longa-Pena, P. Rahvar, S. Rabus, M. Skottfelt, J. Snodgrass, C. Southworth, J. Unda-Sanzana, E. von Essen, C. Beaulieu, J. -P. Blackman, J. Hill, K. |
| Affiliation | Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland CALTECH, IPAC, Mail Code 100-22,1200 E Calif Blvd, Pasadena, CA 91125 USA Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA Korea Astron & Space Sci Inst, Daejon 34055, South Korea Univ Sci & Technol Korea UST, Astron & Space Sci Major, 217 Gajeong Ro, Daejeon 34113, South Korea Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany CFHT Corp, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743 USA Univ Toulouse, UPS OMP, IRAP, F-31400 Toulouse, France Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China Univ Copenhagen, Niels Bohr Inst, Oster Voldgade 5, DK-1350 Copenhagen, Denmark Univ Copenhagen, Ctr Star & Planet Format, Oster Voldgade 5, DK-1350 Copenhagen, Denmark Univ Tasmania, Sch Nat Sci, Private Bag 37, Hobart, Tas 7001, Australia Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA Univ Toronto, Canadian Inst Theoret Astrophys, 60 St George St, Toronto, ON M5S 3H8, Canada Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch 8020, New Zealand Chungbuk Natl Univ, Dept Phys, Cheongju 28644, South Korea Kyung Hee Univ, Sch Space Res, Yongin 17104, Kyeonggi, South Korea Ohio State Univ, Ctr Cosmol & AstroParticle Phys, 191 West Woodruff Ave, Columbus, OH 43210 USA Massey Univ, Inst Nat & Math Sci, Auckland 0745, New Zealand Nagoya Univ, Insti Space Earth Environm Res, Nagoya, Aichi 4648601, Japan NASA, Goddard Space Flight Ctr, Code 667, Greenbelt, MD 20771 USA Univ Maryland, Dept Astron, College Pk, MD 20742 USA Univ Auckland, Dept Phys, Private Bag 92019, Auckland, New Zealand Natl Astron Observ Japan, Okayama Astrophys Observ, 3037-5 Honjo, Asakuchi, Okayama 7190232, Japan Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan Victoria Univ, Sch Chem & Phys Sci, Wellington 6140, New Zealand Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2525210, Japan Univ Canterbury, Mt John Observ, POB 56, Lake Tekapo 8770, New Zealand Kyoto Sangyo Univ, Dept Phys, Fac Sci, Kyoto 6038555, Japan Auckland Observ, Auckland 1345, New Zealand Possum Observ, Patutahi, New Zealand Kumeu Observ, Kumeu, New Zealand AUT Univ, IRASR, Auckland 1010, New Zealand Turitea Observ, Palmerston North, New Zealand Las Cumbres Observ, 6740 Cortona Dr,Suite 102, Goleta, CA 93117 USA Tel Aviv Univ, Sch Phys & Astron, IL-6997801 Tel Aviv, Israel Univ Heidelberg ZAH, Zentrum Astron, Astron Rechen Inst, D-69120 Heidelberg, Germany Univ Salerno, Dipartimento Fis ER Caianiello, Via Giovanni Paolo II 132, I-84084 Fisciano, Italy Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy Univ St Andrews, Ctr Exoplanet Sci, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland Univ Coimbra, CITEUC Ctr Earth & Space Res, Geophys & Astron Observ, R Observ S-N, P-3040004 Coimbra, Portugal Isfahan Univ Technol, Dept Phys, Esfahan 8415683111, Iran Univ Hamburg, Fac Math Informat & Nat Sci, Dept Earth Sci, Inst Meteorol, Bundesstr 55, D-20146 Hamburg, Germany Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England Nagoya Univ, Inst Adv Res, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan Nagoya Univ, Dept Phys, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan Univ Atacama, Inst Astron & Ciencias Planetarias Atacama, Copayapu 485, Copiapo, Chile Chungnam Natl Univ, Dept Astron & Space Sci, Daejeon 34134, South Korea Univ Roma Tor Vergata, Dipartimento Fis, Via Ric Sci 1, I-00133 Rome, Italy IIASS, Via G Pellegrino 19, I-84019 Vietri Sur Mare, SA, Italy Univ Antofagasta, Ctr Astron, Ave Angamos 601, Antofagasta, Chile Sharif Univ Technol, Dept Phys, POB 11155-9161, Tehran, Iran Las Cumbres Observ Global Telescope, 6740 Cortona Dr,Suite 102, Goleta, CA 93111 USA Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA Open Univ, Ctr Elect Imaging, Dept Phys Sci, Milton Keynes MK7 6AA, Bucks, England Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark UPMC Univ Paris 6, Sorbonne Univ, 98 Bis Bd Arago, F-75014 Paris, France Inst Astrophys Paris, CNRS, UMR 7095, 98 Bis Bd Arago, F-75014 Paris, France |
| Keywords | asteroseismology gravitational lensing: micro stars: fundamental parameters stars: oscillations |
| Issue Date | 2019 |
| Publisher | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| Abstract | We present the analysis of the event OGLE-2017-B1,G-1186 from the 2017.Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically bright and variable, which makes it possible to perform an asteroseismic analysis using ground-based data. We find that the source star is an oscillating red giant with average time scale of similar to 9 d. The asteroseismic analysis also provides us source properties including the source angular size (similar to 27 as) and distance (similar to 11.5 kpc), which are essential for inferring the properties of the lens. When fitting the light curve, we test the feasibility of Gaussian processes (GPs) in handling the correlated noise caused by the variable source. We find that the parameters from the GP model are generally more loosely constrained than those from the traditional chi(2) minimization method. We note that this event is the first microlensing system for which asteroseismology and GPs have been used to account for the variable source. With both finite-source effect and microlens parallax measured, we find that the lens is likely a similar to 0,045 M-circle dot brown dwarf at distance similar to 9.0 kpc, or a similar to 0.073 M-circle dot ultracool dwarf at distance similar to 9.8 kpc. Combining the estimated lens properties with a Bayesian analysis using a Galactic model, we find a similar to 35 per cent probability for the lens to be a bulge object and similar to 65 per cent to be a background disc object. |
| URI | http://hdl.handle.net/20.500.11897/545453 |
| ISSN | 0035-8711 |
| DOI | 10.1093/mnras/stz1873 |
| Indexed | SCI(E) |
| Appears in Collections: | 科维理天文与天体物理研究所 |
