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KMT-2016-BLG-1107: A New Hollywood-planet Close/Wide Degeneracy

Hwang, Kyu-Ha and Ryu, Yoon-Hyun and Kim, Hyoun-Woo and Albrow, Michael D. and Chung, Sun-Ju and Gould, Andrew and Han, Cheongho and Jung, Youn Kil and Shin, In-Gu and Shvartzvald, Yossi and Yee, Jennifer C. and Zang, Weicheng and Cha, Sang-Mok and Kim, Dong-Jin and Kim, Seung-Lee and Lee, Chung-Uk and Lee, Dong-Joo and Lee, Yongseok and Park, Byeong-Gon and Pogge, Richard W. (2019) KMT-2016-BLG-1107: A New Hollywood-planet Close/Wide Degeneracy. Astronomical Journal, 157 (1). Art. No. 23. ISSN 1538-3881. doi:10.3847/1538-3881/aaf16e.

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We show that microlensing event KMT-2016-BLG-1107 displays a new type of degeneracy between wide-binary and close-binary Hollywood events in which a giant-star source envelops the planetary caustic. The planetary anomaly takes the form of a smooth, two-day "bump" far out on the falling wing of the light curve, which can be interpreted either as the source completely enveloping a minor-image caustic due to a close companion with mass ratio q = 0.036, or partially enveloping a major-image caustic due to a wide companion with q = 0.004. The best estimates of the companion masses are both in the planetary regime (3.3^(+3.5)_(−1.8) M_(jup) and 0.090^(+0.096)_(−0.037) M_(jup)) but differ by an even larger factor than the mass ratios due to different inferred host masses. We show that the two solutions can be distinguished by high-resolution imaging at first light on next-generation ("30 m") telescopes. We provide analytic guidance to understand the conditions under which this new type of degeneracy can appear.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hwang, Kyu-Ha0000-0002-9241-4117
Ryu, Yoon-Hyun0000-0001-9823-2907
Kim, Hyoun-Woo0000-0001-8263-1006
Albrow, Michael D.0000-0003-3316-4012
Chung, Sun-Ju0000-0001-6285-4528
Han, Cheongho0000-0002-2641-9964
Jung, Youn Kil0000-0002-0314-6000
Shin, In-Gu0000-0002-4355-9838
Shvartzvald, Yossi0000-0003-1525-5041
Yee, Jennifer C.0000-0001-9481-7123
Zang, Weicheng0000-0001-6000-3463
Pogge, Richard W.0000-0003-1435-3053
Additional Information:© 2018. The American Astronomical Society. Received 2018 May 22; revised 2018 November 12; accepted 2018 November 13; published 2018 December 27. Work by A.G. was supported by AST-1516842 from the US NSF. I.G.S. and A.G. were supported by JPL grant 1500811. Work by C.H. was supported by the grant (2017R1A4A1015178) of National Research Foundation of Korea. 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Research Foundation of Korea2017R1A4A1015178
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:gravitational lensing: micro
Issue or Number:1
Record Number:CaltechAUTHORS:20190102-135255753
Persistent URL:
Official Citation:Kyu-Ha Hwang et al 2019 AJ 157 23
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91982
Deposited By: George Porter
Deposited On:03 Jan 2019 16:11
Last Modified:16 Nov 2021 03:46

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