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Spitzer Microlensing Parallax for OGLE-2016-BLG-1067: A Sub-Jupiter Orbiting an M Dwarf in the Disk

Calchi Novati, S. and Beichman, C. and Henderson, C. B. and Carey, S. (2019) Spitzer Microlensing Parallax for OGLE-2016-BLG-1067: A Sub-Jupiter Orbiting an M Dwarf in the Disk. Astronomical Journal, 157 (3). Art. No. 121. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20190220-083027656

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Abstract

We report the discovery of a sub-Jupiter-mass planet orbiting beyond the snow line of an M dwarf most likely in the Galactic disk as part of the joint Spitzer and ground-based monitoring of planetary microlensing anomalies toward the Galactic bulge. Most of the microlensing parameters are strongly constrained by the light-curve modeling, and in particular there is a Spitzer-based measurement of the microlens parallax, π E. However, there are no caustic crossings, so the angular Einstein radius has only an upper limit based on the light-curve modeling alone. Additionally, the analysis leads us to identify eight degenerate configurations: the fourfold microlensing parallax degeneracy being doubled by a degeneracy in the caustic structure present at the level of the ground-based solutions. To calculate the physical parameters, and at the same time to break the parallax degeneracy, we make use of a series of arguments: the χ 2 hierarchy, the Rich argument (stating that the small-parallax solution is more likely), and a prior Galactic model. The preferred configuration, favored by a likelihood ratio of at least 4000, is for a host at D_L = 3.73^(+0.66)_(-0.67) kpc with mass M_L = 0.30^(+0.15)_(-0.12) M⊙, orbited by a Saturn-like planet with M_(planet) = 0.43^(+0.21)_(-0.17) M_(Jup) at projected separation a = 1.70^(+0.38)_(-0.39) au, about 2.1 times beyond the system snow line. Therefore, it adds to the growing population of sub-Jupiter planets orbiting beyond the snow line of M dwarfs discovered by microlensing. Based on the rules of the real-time protocol for the selection of events to be followed up with Spitzer, this planet will not enter the sample for measuring the Galactic distribution of planets.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/ab0106DOIArticle
https://arxiv.org/abs/1801.05806arXivDiscussion Paper
ORCID:
AuthorORCID
Calchi Novati, S.0000-0002-7669-1069
Beichman, C.0000-0002-5627-5471
Henderson, C. B.0000-0001-8877-9060
Carey, S.0000-0002-0221-6871
Additional Information:© 2019 The American Astronomical Society. Received 2018 January 2; revised 2018 December 20; accepted 2019 January 21; published 2019 February 19. Work by W.Z., Y.K.J., and A.G. was supported by AST-1516842 from the US NSF. W.Z., I.G.S., and A.G. were supported by JPL grant 1500811. Work by Y.S. was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, California Institute of Technology, administered by Universities Space Research Association through a contract with NASA. Work by C.H. was supported by grant 2017R1A4A101517 of the National Research Foundation of Korea. 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. The MOA project is supported by JSPS KAKENHI grant nos. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, and JP16H06287. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. 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 the three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. This work is based (in part) on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
NSFAST-1516842
JPL1500811
NASA/JPL/CaltechUNSPECIFIED
National Research Foundation of Korea2017R1A4A101517
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
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Subject Keywords:gravitational lensing: micro – planetary systems
Issue or Number:3
Record Number:CaltechAUTHORS:20190220-083027656
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190220-083027656
Official Citation:S. Calchi Novati et al 2019 AJ 157 121
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92994
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Feb 2019 18:39
Last Modified:24 Feb 2020 10:30

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