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Published June 2021 | Version Submitted + Published
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OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through the Planetary-caustic Channel

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Abstract

We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely and continuously covered by two high-cadence surveys. The light-curve modeling indicates that the anomalies are generated by source crossings over the planetary caustics induced by planetary companions to the hosts. The estimated planet/host separation (scaled to the angular Einstein radius θE) and mass ratio are (s, q × 10³) = (1.81 ± 0.02, 1.24 ± 0.07) and (s, q × 10³) = (1.25 ± 0.03, 2.38 ± 0.08), respectively. From Bayesian analyses, we estimate the host and planet masses as (M_h, M_p) = 0.25_(-0.13)^(+0.27) M_⊙, 0.32_(-0.17)^(+0.34) M_J) and (M_h, M_p) = (0.54_(-0.28)^(+0.33) M_⊙, 1.34_(-0.70)^(+0.82) M_J), respectively. These planetary systems are located at a distance of 7.06_(-1.15)^(+0.93) kpc for OGLE-2018-BLG-0567 and 6.50_(-1.75)^(+1.06) kpc for OGLE-2018-BLG-0962, suggesting that they are likely to be near the Galactic bulge. The two events prove the capability of current high-cadence surveys for finding planets through the planetary-caustic channel. We find that most published planetary-caustic planets are found in Hollywood events in which the source size strongly contributes to the anomaly cross-section relative to the size of the caustic.

Additional Information

© 2021. The American Astronomical Society. Received 2021 January 31; revised 2021 March 23; accepted 2021 April 14; published 2021 June 3. 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. Work by C.H. was supported by the grants of National Research Foundation of Korea (2017R1A4A1015178 and 2019R1A2C2085965). The OGLE has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U.

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Published - Kil_Jung_2021_AJ_161_293.pdf

Submitted - 2102.07338.pdf

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2102.07338.pdf

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Additional details

Identifiers

Eprint ID
109381
Resolver ID
CaltechAUTHORS:20210604-111534460

Related works

Describes
https://arxiv.org/abs/2102.07338 (URL)

Funding

National Research Foundation of Korea
2017R1A4A1015178
National Research Foundation of Korea
2019R1A2C2085965
National Science Centre (Poland)
2014/14/A/ST9/00121

Dates

Created
2021-06-07
Created from EPrint's datestamp field
Updated
2021-11-16
Created from EPrint's last_modified field