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Brown dwarf companions in microlensing binaries detected during the 2016–2018 seasons
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(2022) Brown dwarf companions in microlensing binaries detected during the 2016–2018 seasons. Astronomy & Astrophysics, 667 . A64. doi:10.1051/0004-6361/202244186 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/202244186
Abstract
Aims. With the aim of finding microlensing binaries containing brown dwarf (BD) companions, we investigate the microlensing survey data collected during the 2016–2018 seasons.
Methods. For this purpose, we first modeled lensing events with light curves exhibiting anomaly features that are likely to be produced by binary lenses. We then sorted out BD companion binary-lens events by applying the criterion that the companion-to-primary mass ratio is q ≲ 0.1. With this procedure, we identify six binaries with candidate BD companions: OGLE-2016-BLG-0890L, MOA-2017-BLG-477L, OGLE-2017-BLG-0614L, KMT-2018-BLG-0357L, OGLE-2018-BLG-1489L, and OGLE-2018-BLG-0360L.
Results. We estimated the masses of the binary companions by conducting Bayesian analyses using the observables of the individual lensing events. According to the Bayesian estimation of the lens masses, the probabilities for the lens companions of the events OGLE-2016-BLG-0890, OGLE-2017-BLG-0614, OGLE-2018-BLG-1489, and OGLE-2018-BLG-0360 to be in the BD mass regime are very high with PBD > 80%. For MOA-2017-BLG-477 and KMT-2018-BLG-0357, the probabilities are relatively low with PBD = 61% and 69%, respectively.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Brown dwarf stars, Astrophysics, Gravitational lenses, Microlensing (Astrophysics) | ||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||||||||||||||||||||||||||||||||||
Publisher: | EDP Sciences | ||||||||||||||||||||||||||||||||||||
ISSN: | 0004-6361 | ||||||||||||||||||||||||||||||||||||
Official Date: | November 2022 | ||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 667 | ||||||||||||||||||||||||||||||||||||
Article Number: | A64 | ||||||||||||||||||||||||||||||||||||
DOI: | 10.1051/0004-6361/202244186 | ||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 21 December 2022 | ||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 21 December 2022 | ||||||||||||||||||||||||||||||||||||
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Contributors: |
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