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OGLE-2018-BLG-0799Lb :a q ∼ 2.7 × 10−3 planet with Spitzer parallax
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(2022) OGLE-2018-BLG-0799Lb :a q ∼ 2.7 × 10−3 planet with Spitzer parallax. Monthly Notices of the Royal Astronomical Society, 514 (4). pp. 5952-5968. doi:10.1093/mnras/stac1631 ISSN 1365-2966.
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Official URL: https://doi.org/10.1093/mnras/stac1631
Abstract
We report the discovery and analysis of a planet in the microlensing event OGLE-2018-BLG-0799. The planetary signal was observed by several ground-based telescopes, and the planet-host mass ratio is q = (2.65 ± 0.16) × 10−3. The ground-based observations yield a constraint on the angular Einstein radius θE, and the microlensing parallax vector $\vec{\pi }_{\rm E}$, is strongly constrained by the Spitzer data. However, the 2019 Spitzer baseline data reveal systematics in the Spitzer photometry, so there is ambiguity in the magnitude of the parallax. In our preferred interpretation, a full Bayesian analysis using a Galactic model indicates that the planetary system is composed of an $M_{\rm planet} = 0.26_{-0.11}^{+0.22}~M_{J}$ planet orbiting an $M_{\rm host} = 0.093_{-0.038}^{+0.082}~\mathrm{M}_{\odot }$, at a distance of $D_{\rm L} = 3.71_{-1.70}^{+3.24}$ kpc. An alternate interpretation of the data shifts the localization of the minima along the arc-shaped microlens parallax constraints. This, in turn, yields a more massive host with median mass of 0.13 M⊙ at a distance of 6.3 kpc. This analysis demonstrates the robustness of the osculating circles formalism, but shows that further investigation is needed to assess how systematics affect the specific localization of the microlens parallax vector and, consequently, the inferred physical parameters.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press (OUP) | ||||||||
ISSN: | 1365-2966 | ||||||||
Official Date: | August 2022 | ||||||||
Dates: |
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Volume: | 514 | ||||||||
Number: | 4 | ||||||||
Page Range: | pp. 5952-5968 | ||||||||
DOI: | 10.1093/mnras/stac1631 | ||||||||
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 | ||||||||
Copyright Holders: | © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society | ||||||||
Date of first compliant deposit: | 16 August 2022 | ||||||||
Date of first compliant Open Access: | 16 August 2022 | ||||||||
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