The 2L1S/1L2S Degeneracy for Two Microlensing Planet Candidates Discovered by the KMTNet Survey in 2017 - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2019

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

I. -G. Shin
  • Function : Author
J. C. Yee
  • Function : Author
A. Gould
  • Function : Author
M. T. Penny
  • Function : Author
I. A. Bond
  • Function : Author
M. D. Albrow
  • Function : Author
S. -J. Chung
  • Function : Author
C. Han
  • Function : Author
K. -H. Hwang
  • Function : Author
Y. K. Jung
  • Function : Author
Y. -H. Ryu
  • Function : Author
Y. Shvartzvald
  • Function : Author
S. -M. Cha
  • Function : Author
D. -J. Kim
  • Function : Author
H. -W. Kim
  • Function : Author
S. -L. Kim
  • Function : Author
C. -U. Lee
  • Function : Author
D. -J. Lee
  • Function : Author
Y. Lee
  • Function : Author
B. -G. Park
  • Function : Author
R. W. Pogge
  • Function : Author
F. Abe
  • Function : Author
R. Barry
  • Function : Author
D. P. Bennett
  • Function : Author
A. Bhattacharya
  • Function : Author
M. Donachie
  • Function : Author
H. Fujii
  • Function : Author
A. Fukui
  • Function : Author
Y. Hirao
  • Function : Author
Y. Itow
  • Function : Author
Y. Kamei
  • Function : Author
Iona Kondo
N. Koshimoto
M. C. A. Li
  • Function : Author
Y. Matsubara
  • Function : Author
S. Miyazaki
  • Function : Author
Y. Muraki
  • Function : Author
M. Nagakane
  • Function : Author
C. Ranc
  • Function : Author
N. J. Rattenbury
  • Function : Author
Harmon Suematsu
  • Function : Author
D. J. Sullivan
  • Function : Author
T. Sumi
  • Function : Author
Daisuke Suzuki
P. J. Tristram
  • Function : Author
T. Yamakawa
  • Function : Author
A. Yonehara
  • Function : Author
W. Zang
  • Function : Author

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).

Dates and versions

insu-03674397 , version 1 (20-05-2022)

Identifiers

Cite

I. -G. Shin, J. C. Yee, A. Gould, M. T. Penny, I. A. Bond, et al.. The 2L1S/1L2S Degeneracy for Two Microlensing Planet Candidates Discovered by the KMTNet Survey in 2017. The Astronomical Journal, 2019, 158, ⟨10.3847/1538-3881/ab46a5⟩. ⟨insu-03674397⟩
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