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OGLE-2019-BLG-1470LABc : another microlensing giant planet in a binary system?
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(2022) OGLE-2019-BLG-1470LABc : another microlensing giant planet in a binary system? Monthly Notices of the Royal Astronomical Society, 516 (2). pp. 1704-1720. doi:10.1093/mnras/stac2315 ISSN 1745-3933.
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Official URL: http://dx.doi.org/10.1093/mnras/stac2315
Abstract
We report the discovery and analysis of a candidate triple-lens single-source (3L1S) microlensing event, OGLE-2019-BLG-1470. This event was first classified as a normal binary-lens single-source (2L1S) event, but a careful 2L1S modelling showed that it needs an additional lens or source to fit the observed data. It is found that the 3L1S model provides the best fit, but the binary-lens binary-source (2L2S) model is only disfavoured by Δχ2 ≃ 18. All of the feasible models include a planet with planet-to-host mass-ratios 10−3 ≲ q ≲ 10−2. A Bayesian analysis based on a Galactic model indicates that the planet is super-Jovian, and the projected host-planet separation is about 3 au. Specifically, for the best-fitting 3L1S model, the two stars have masses of M1=0.57+0.43−0.32M⊙, and M2=0.18+0.15−0.10M⊙ with projected separation of 1.3+0.5−0.5 au, and the planetary mass is M3=2.2+1.8−1.3MJupiter. For the 2L2S model, the masses of the host star and the planet are 0.55+0.44−0.31M⊙ and 4.6+3.7−2.6MJupiter, respectively. By investigating the properties of all known microlensing planets in binary systems, we find that all planets in binary systems published by the KMTNet survey are located inside the resonant caustics range with q ≳ 2 × 10−3, indicating the incompleteness of the KMTNet sample for planets in binary systems. Thus, planets in binary systems cannot be included in the current study of the KMTNet mass-ratio function, and a systematic search for planetary anomalies in KMTNet microlensing light curves of binary systems is needed.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Gravitational lenses, Microlensing (Astrophysics), Extrasolar planets -- Detection, Satellites | |||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||||||||
Official Date: | 18 August 2022 | |||||||||||||||||||||
Dates: |
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Volume: | 516 | |||||||||||||||||||||
Number: | 2 | |||||||||||||||||||||
Page Range: | pp. 1704-1720 | |||||||||||||||||||||
DOI: | 10.1093/mnras/stac2315 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Date of first compliant deposit: | 17 October 2022 | |||||||||||||||||||||
Date of first compliant Open Access: | 17 October 2022 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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