Systematic KMTNet Planetary Anomaly Search. XII. Complete Sample of 2017 Subprime Field Planets

Abstract

We report the analysis of four unambiguous planets and one possible planet from the subprime fields ($\Gamma \le 1{\mathrm{hr}}^{-1}$) of the 2017 Korea Microlensing Telescope Network (KMTNet) microlensing survey, to complete the KMTNet AnomalyFinder planetary sample for the 2017 subprime fields. They are KMT-2017-BLG-0849, KMT-2017-BLG-1057, OGLE-2017-BLG-0364, and KMT-2017-BLG-2331 (unambiguous), as well as KMT-2017-BLG-0958 (possible). For the four unambiguous planets, the mean planet-host mass ratios, $q$, are $(1.0,1.2,4.6,13)\times 10^{-4}$, the median planetary masses are $(6.4,24,76,171)M_{\oplus }$ and the median host masses are $(0.19,0.57,0.49,0.40)M_{\odot }$ from a Bayesian analysis. We have completed the AnomalyFinder planetary sample from the first 4-year KMTNet data (2016--2019), with 112 unambiguous planets in total, which nearly tripled the microlensing planetary sample. The ``sub-Saturn desert'' ($\log q=\left[-3.6,-3.0\right]$) found in the 2018 and 2019 KMTNet samples is confirmed by the 2016 and 2017 KMTNet samples.

Published in AJ

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Cited by in corpus (1)

• The Brown-dwarf Desert Persists as a Mass-ratio Desert around Low-mass Stars