The 2L1S/1L2S Degeneracy for Two Microlensing Planet Candidates Discovered by the KMTNet Survey in 2017

Creators: Shin, I.-G.; Shvartzvald, Y.; KMTNet Collaboration; MOA Collaboration; CFHT-K2C9 Microlensing Collaboration

Abstract

We report two microlensing planet candidates discovered by the Korea Microlensing Telescope Network (KMTNet) survey in 2017. However, both events have the 2L1S/1L2S degeneracy, which is an obstacle to claiming the discovery of the planets with certainty unless the degeneracy can be resolved. For KMT-2017-BLG-0962, the degeneracy cannot be resolved. If the 2L1S solution is correct, KMT-2017-BLG-0962 might be produced by a super Jupiter-mass planet orbiting a mid-M-dwarf host star. For KMT-2017-BLG-1119, the light-curve modeling favors the 2L1S solution but higher-resolution observations of the baseline object tend to support the 1L2S interpretation rather than the planetary interpretation. This degeneracy might be resolved by a future measurement of the lens-source relative proper motion. This study shows that the problem of resolving 2L1S/1L2S degeneracy exists over a much wider range of conditions than those considered by the theoretical study of Gaudi (1998).

Additional Information

© 2019 The American Astronomical Society. Received 2019 February 27; revised 2019 September 6; accepted 2019 September 20; published 2019 October 24. 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. Work by I.G.S. and A.G. was supported by JPL grant 1500811. A.G. acknowledges the support from NSF grant AST-1516842. 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. This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories, Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. Work by M.T.P. was partially supported by NASA grants NNX16AC62G and NNG16PJ32C. Work by W.Z. and P.F. was supported by Canada–France–Hawaii Telescope (CFHT). The MOA project is supported by JSPS KAKENHI grant No. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, and JP16H06287.

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Accepted Version - 1902.10945.pdf

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