KMT-2016-BLG-1836Lb: A Super-Jovian Planet from a High-cadence Microlensing Field

Creators: Yang, Hongjing; Shvartzvald, Yossi

Abstract

We report the discovery of a super-Jovian planet in the microlensing event KMT-2016-BLG-1836, which was found by the Korea Microlensing Telescope Network (KMTNet) high-cadence observations (Γ ~ 4 hr^⁻¹). The planet–host mass ratio q ~ 0.004. A Bayesian analysis indicates that the planetary system is composed of a super-Jovian M_(planet) = 2.2^(+1.9)_(-1.1)M_J planet orbiting an M or K dwarf, M_(host) = 0.49^(+0.38)_(-0.25) M_⊙, at a distance of D_L = 7.1^(+0.8)_(-2.4) kpc. The projected planet–host separation is 3.5^(+1.1)_(-0.9) au, implying that the planet is located beyond the snow line of the host star. Future high-resolution images can potentially strongly constrain the lens brightness and thus the mass and distance of the planetary system. Without considering detailed detection efficiency, selection, or publication biases, we find a potential mass-ratio desert at −3.7 ≾ log q ≾ −3.0 for the 31 published KMTNet planets.

Additional Information

© 2020 The American Astronomical Society. Received 2019 August 27; revised 2019 December 21; accepted 2019 December 26; published 2020 February 11. 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. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories of China, the Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. H.Y., X.Z., W.Z., W.T., and S.M. acknowledge support by the National Science Foundation of China (grant No. 11821303 and 11761131004). Work by A.G. was supported by AST-1516842 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 grant (2017R1A4A1015178) of National Research Foundation of Korea. Work by P.F. and W.Z. was supported by Canada–France–Hawaii Telescope (CFHT). M.T.P. was supported by NASA grants NNX14AF63G and NNG16PJ32C, as well as the Thomas Jefferson Chair for Discovery and Space Exploration. W.Z. was supported by the Beatrice and Vincent Tremaine Fellowship at CITA. Partly based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada–France–Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de lUnivers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. Software: pySIS (Albrow et al. 2009), pyDIA (Albrow 2017, as developed on GitHub), emcee (Foreman-Mackey et al. 2013), DoPhot (Schechter et al. 1993).

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Accepted Version - 1908.10011.pdf

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