Mass Production of 2021 KMTNet Microlensing Planets II

TL;DR

This paper reports the discovery and confirmation of four new microlensing planets from the 2021 KMTNet data, highlighting the importance of by-eye detection for completeness and potential for follow-up characterization.

Contribution

It provides a comprehensive list of 16 planets found in 2021 KMTNet data, emphasizing the role of manual detection in validating automated methods.

Findings

Four new planets with specific mass ratios identified.

Total of 16 planets confirmed from 2021 KMTNet data.

Potential for follow-up observations to characterize host stars.

Abstract

We continue our program of publishing all planets (and possible planets) found by eye in 2021 Korea Microlensing Telescope Network (KMTNet) online data. We present 4 planets, (KMT-2021-BLG-0712Lb, KMT-2021-BLG-0909Lb, KMT-2021-BLG-2478Lb, and KMT-2021-BLG-1105Lb), with planet-host mass ratios in the range -3.3 < log q < -2.2. This brings the total of secure, by-eye, 2021 KMTNet planets to 16, including 8 in this series. The by-eye sample is an important check of the completeness of semi-automated detections, which are the basis for statistical analyses. One of the planets, KMT-2021-BLG-1105Lb, is blended with a relatively bright $(I,V)\sim (18.9,21.6)$ star that may be the host. This could be verified immediately by high-resolution imaging. If so, the host is an early G dwarf, and the planet could be characterized by radial-velocity observations on 30m class telescopes.