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OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet orbiting M-dwarf Host in the Inner Galactic Disk

Hirao, Yuki and Bennett, David P. and Ryu, Yoon-Hyun and Koshimoto, Naoki and Udalski, Andrzej and Yee, Jennifer C. and Sumi, Takahiro and Bond, Ian A. and Shvartzvald, Yossi and Abe, Fumio and Barry, Richard K. and Bhattacharya, Aparna and Donachie, Martin and Fukui, Akihiko and Itow, Yoshitaka and Kondo, Iona and Li, Man Cheung Alex and Matsubara, Yutaka and Matsuo, Taro and Miyazaki, Shota and Muraki, Yasushi and Nagakane, Masayuki and Ranc, Clément and Rattenbury, Nicholas J. and Suematsu, Haruno and Shibai, Hiroshi and Suzuki, Daisuke and Tristram, Paul J. and Yonehara, Atsunori and Skowron, J. and Poleski, R. and Mróz, P. and Szymański, M. K. and Soszynski, I. and Kozlowski, S. and Pietrukowicz, P. and Ulaczyk, K. and Rybicki, K. and Iwanek, P. and Albrow, Michael D. and Chung, Sun-Ju and Gould, Andrew and Han, Cheongho and Hwang, Kyu-Ha and Jung, Youn Kil and Shin, In-Gu and Zang, Weicheng and Cha, Sang-Mok and Kim, Dong-Jin and Kim, Hyoun-Woo and Kim, Seung-Lee and Lee, Chung-Uk and Lee, Dong-Joo and Lee, Yongseok and Park, Byeong-Gon and Pogge, Richard W. and Beichman, Charles A. and Bryden, Geoffrey and Calchi Novati, Sebastiano and Carey, Sean and Gaudi, B. Scott and Henderson, Calen B. and Zhu, Wei and Bachelet, Etienne and Bolt, Greg and Christie, Grant and Hundertmark, Markus and Natusch, Tim and Maoz, Dan and McCormick, Jennie and Street, Rachel A. and Tan, Thiam-Guan and Tsapras, Yiannis and Jorgensen, U. G. and Dominik, M. and Bozza, V. and Skottfelt, J. and Snodgrass, C. and Ciceri, S. and Figuera Jaimes, R. and Evans, D. F. and Peixinho, N. and Hinse, T. C. and Burgdorf, M. J. and Southworth, J. and Rahvar, S. and Sajadian, S. and Rabus, M. and von Essen, C. and Fujii, Y. I. and Campbell-White, J. and Lowry, S. and Helling, C. and Mancini, L. and Haikala, L. and Kandori, Ryo (2020) OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet orbiting M-dwarf Host in the Inner Galactic Disk. Astronomical Journal, 160 (2). Art. No. 74. ISSN 1538-3881. doi:10.3847/1538-3881/ab9ac3.

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We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the Spitzer satellite in a solar orbit. At high magnification, the anomaly in the light curve was densely observed by ground-based-survey and follow-up groups, and it was found to be explained by a planetary lens with a planet/host mass ratio of q = 7.0 × 10⁻⁴ from the light-curve modeling. The ground-only and Spitzer-"only" data each provide very strong one-dimensional (1D) constraints on the 2D microlens parallax vector π_E. When combined, these yield a precise measurement of π_E and of the masses of the host M_(host) = 0.56 ± 0.07 M_⊙ and planet M_(planet) = 0.41 ± 0.05 M_(Jup). The system lies at a distance D_L = 5.2 ± 0.5 kpc from the Sun toward the Galactic bulge, and the host is more likely to be a disk population star according to the kinematics of the lens. The projected separation of the planet from the host is a_⊥ = 3.5 ± 0.3 au (i.e., just over twice the snow line). The Galactic-disk kinematics are established in part from a precise measurement of the source proper motion based on OGLE-IV data. By contrast, the Gaia proper-motion measurement of the source suffers from a catastrophic 10σ error.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bennett, David P.0000-0001-8043-8413
Ryu, Yoon-Hyun0000-0001-9823-2907
Koshimoto, Naoki0000-0003-2302-9562
Udalski, Andrzej0000-0001-5207-5619
Yee, Jennifer C.0000-0001-9481-7123
Shvartzvald, Yossi0000-0003-1525-5041
Barry, Richard K.0000-0003-4916-0892
Fukui, Akihiko0000-0002-4909-5763
Itow, Yoshitaka0000-0002-8198-1968
Kondo, Iona0000-0002-3401-1029
Miyazaki, Shota0000-0001-9818-1513
Ranc, Clément0000-0003-2388-4534
Rattenbury, Nicholas J.0000-0001-5069-319X
Suzuki, Daisuke0000-0002-5843-9433
Skowron, J.0000-0002-2335-1730
Poleski, R.0000-0002-9245-6368
Mróz, P.0000-0001-7016-1692
Pietrukowicz, P.0000-0002-2339-5899
Ulaczyk, K.0000-0001-6364-408X
Iwanek, P.0000-0002-6212-7221
Albrow, Michael D.0000-0003-3316-4012
Chung, Sun-Ju0000-0001-6285-4528
Han, Cheongho0000-0002-2641-9964
Hwang, Kyu-Ha0000-0002-9241-4117
Jung, Youn Kil0000-0002-0314-6000
Shin, In-Gu0000-0002-4355-9838
Zang, Weicheng0000-0001-6000-3463
Cha, Sang-Mok0000-0002-7511-2950
Kim, Hyoun-Woo0000-0001-8263-1006
Kim, Seung-Lee0000-0003-0562-5643
Lee, Chung-Uk0000-0003-0043-3925
Lee, Yongseok0000-0001-7594-8072
Park, Byeong-Gon0000-0002-6982-7722
Pogge, Richard W.0000-0003-1435-3053
Beichman, Charles A.0000-0002-5627-5471
Calchi Novati, Sebastiano0000-0002-7669-1069
Carey, Sean0000-0002-0221-6871
Gaudi, B. Scott0000-0003-0395-9869
Henderson, Calen B.0000-0001-8877-9060
Zhu, Wei0000-0003-4027-4711
Bachelet, Etienne0000-0002-6578-5078
Street, Rachel A.0000-0001-6279-0552
Tan, Thiam-Guan0000-0001-5603-6895
Tsapras, Yiannis0000-0001-8411-351X
Dominik, M.0000-0002-3202-0343
Bozza, V.0000-0003-4590-0136
Hinse, T. C.0000-0001-8870-3146
Rabus, M.0000-0003-2935-7196
Mancini, L.0000-0002-9428-8732
Additional Information:© 2020 The American Astronomical Society. Received 2020 April 20; revised 2020 June 4; accepted 2020 June 6; published 2020 July 23. Work by Y.H. was supported by JSPS KAKENHI grant No. 17J02146. D.P.B., A.B., and C.R. were supported by NASA through grant NASA-80NSSC18K0274. Work by N.K. is supported by JSPS KAKENHI grant No. JP18J00897. Work by C.R. was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by USRA through a contract with NASA. Work by A.G. was supported by AST-1516842 from the US NSF and by JPL grant 1500811. A.G. received support from the European Research Council under the European Unions Seventh Framework Programme (FP 7) ERC grant Agreement No. [321035]. Work by C.H. was supported by the grants of the National Research Foundation of Korea (2017R1A4A1015178 and 2019R1A2C2085965). The MOA project is supported by JSPS KAKENHI grant No. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, JP16H06287, 17H02871, and 19KK0082. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to AU. This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI), and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. Y.T. acknowledges the support of DFG priority program SPP 1992 "Exploring the Diversity of Extrasolar Planets" (WA 1047/11-1).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)17J02146
Japan Society for the Promotion of Science (JSPS)JP18J00897
NASA Postdoctoral ProgramUNSPECIFIED
European Research Council (ERC)321035
National Research Foundation of Korea2017R1A4A1015178
National Research Foundation of Korea2019R1A2C2085965
Japan Society for the Promotion of Science (JSPS)JSPS24253004
Japan Society for the Promotion of Science (JSPS)JSPS26247023
Japan Society for the Promotion of Science (JSPS)JSPS23340064
Japan Society for the Promotion of Science (JSPS)JSPS15H00781
Japan Society for the Promotion of Science (JSPS)JP16H06287
Japan Society for the Promotion of Science (JSPS)JP17H02871
Japan Society for the Promotion of Science (JSPS)JP19KK0082
National Science Centre (Poland)2014/14/A/ST9/00121
Deutsche Forschungsgemeinschaft (DFG)WA 1047/11-1
Subject Keywords:Gravitational microlensing ; Gravitational microlensing exoplanet detection
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Gravitational microlensing (672); Gravitational microlensing exoplanet detection (2147)
Record Number:CaltechAUTHORS:20200611-133319995
Persistent URL:
Official Citation:Yuki Hirao et al 2020 AJ 160 74
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103858
Deposited By: George Porter
Deposited On:11 Jun 2020 20:53
Last Modified:08 Aug 2022 20:55

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