Systematic KMTNet Planetary Anomaly Search. VIII. Complete Sample of 2019 Subprime Field Planets

Abstract

We complete the publication of all microlensing planets (and “possible planets”) identified by the uniform approach of the KMT AnomalyFinder system in the 21 KMT subprime fields during the 2019 observing season, namely, KMT-2019-BLG-0298, KMT-2019-BLG-1216, KMT-2019-BLG-2783, OGLE-2019-BLG-0249, and OGLE-2019-BLG-0679 (planets), as well as OGLE-2019-BLG-0344 and KMT-2019-BLG-0304 (possible planets). The five planets have mean log mass ratio measurements of (−2.6, −3.6, −2.5, −2.2, −2.3), median mass estimates of (1.81, 0.094, 1.16, 7.12, 3.34) M Jup, and median distance estimates of (6.7, 2.7, 5.9, 6.4, 5.6) kpc, respectively. The main scientific interest of these planets is that they complete the AnomalyFinder sample for 2019, which has a total of 25 planets that are likely to enter the statistical sample. We find statistical consistency with the previously published 33 planets from the 2018 AnomalyFinder analysis according to an ensemble of five tests. Of the 58 planets from 2018–2019, 23 were newly discovered by AnomalyFinder. Within statistical precision, half of the planets have caustic crossings, while half do not; an equal number of detected planets result from major- and minor-image light-curve perturbations; and an equal number come from KMT prime fields versus subprime fields.

OGLE-2016-BLG-1195 AO: Lens, Companion to Lens or Source, or None of the Above?

“…Hence, testing the reliability of Spitzer-based parallaxes on events with fainter sources, e.g., OGLE-2016-BLG-1195, is crucial for establishing the conditions under which these giant-source planetary events can be included. We note that new Spitzer planets are still being discovered (so not yet cataloged by Gould 2022), including OGLE-2019-BLG-0679 (Jung et al 2023) and OGLE-2017-BLG-1275 (Ryu et al 2023), with the former having a giant source. Thus, one of the technical goals of current highresolution studies should definitely be to test Spitzer parallaxes when feasible, in particular focusing on those that, like OGLE-2016-BLG-1195, do not have giant-star sources.…”

Systematic KMTNet Planetary Anomaly Search. IX. Complete Sample of 2016 Prime-field Planets

“…where σ μ = 3 mas yr −1 and ν = 1. See also Equation (9) of Jung et al (2023). Applying this formula to the 1L2S solution, we find p = 1.9%.…”

“…In Table 11, we present various lens properties for each event because each event has degenerate solutions, which yield different lens properties. For ease of cataloging, we present "adopted" values for each property by adopting the method described in Jung et al (2023), i.e., weighted average values. Note.…”

“…Gould et al (2022) introduced the systematic analysis of AnomalyFinder candidates. We have already done the systematic searches for the 2018 prime field (Gould et al 2022;Hwang et al 2022;Wang et al 2022), 2018 subprime fields (Jung et al 2022), 2019 prime fields (Zang et al 2021(Zang et al , 2022aHwang et al 2022), and 2019 subprime fields (Jung et al 2023). In addition, Zang et al (2023) presented a complete sample of planets with the mass ratio q < 10 −4 discovered from all candidate events observed from 2016 to 2019.…”

Toward Measuring the Microlensing Event Rate in the Galactic Center. I. Event Detection from the UKIRT Microlensing Survey Data

“…These events are probably binary microlensing events, i.e., binary-lens singlesource or single-lens binary-source events. If the 27 events are all real anomalous microlensing events, the binary ratio is ∼5%, which is lower than the ∼11% binary ratio of the KMTNet survey with the AnomalyFinder algorithm (Gould et al 2022b;Jung et al 2022;Zang et al 2022;Jung et al 2023;Shin et al 2023). This is reasonable because the KMTNet survey has a much higher cadence than the UKIRT survey.…”