Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 2020 | Published + Submitted
Journal Article Open

KMT-2019-BLG-1339L: An M Dwarf with a Giant Planet or a Companion near the Planet/Brown Dwarf Boundary

Abstract

We analyze KMT-2019-BLG-1339, a microlensing event with an obvious but incompletely resolved brief anomaly feature around the peak of the light curve. Although the origin of the anomaly is identified to be a companion to the lens with a low mass ratio q, the interpretation is subject to two different degeneracy types. The first type is the ambiguity in ρ, representing the angular source radius scaled to the angular radius of the Einstein ring, θ_E, and the other is the s ↔ s⁻¹ degeneracy. The former type, "finite-source degeneracy," causes ambiguities in both s and q, while the latter induces an ambiguity only in s. Here, s denotes the separation (in units of θ_E) in projection between the lens components. We estimate that the lens components have masses (M₁,M₂)∼(0.27^(+0.36)_(−0.15) M⊙,11⁺¹⁶₋₇ M_J) and ~(0.48^(+0.40)_(−0.28) M⊙, 1.3^(+1.1)_(−0.7) M_J) according to the two solutions subject to the finite-source degeneracy, indicating that the lens comprises an M dwarf and a companion with a mass around the planet/brown dwarf boundary or a Jovian-mass planet. It is possible to lift the finite-source degeneracy by conducting future observations utilizing a high-resolution instrument because the relative lens–source proper motion predicted by the solutions is widely different.

Additional Information

© 2020 The American Astronomical Society. Received 2020 March 4; revised 2020 May 15; accepted 2020 June 5; published 2020 July 13. The work by C.H. was supported by the grants of the National Research Foundation of Korea (2017R1A4A1015178 and 2019R1A2C2085965). The work by A.G. was supported by the JPL grant 1500811. 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 three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia.

Attached Files

Published - Han_2020_AJ_160_64.pdf

Submitted - 2003.02375.pdf

Files

Han_2020_AJ_160_64.pdf
Files (1.4 MB)
Name Size Download all
md5:b6a52dc42799415652a09035fd2f68b5
828.4 kB Preview Download
md5:1296c37d057ce994e955d5ac12569e59
617.0 kB Preview Download

Additional details

Created:
August 22, 2023
Modified:
October 20, 2023