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SN 2020udy : a SN Iax with strict limits on interaction consistent with a helium-star companion
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(2023) SN 2020udy : a SN Iax with strict limits on interaction consistent with a helium-star companion. Monthly Notices of the Royal Astronomical Society, 525 (1). pp. 1210-1228. doi:10.1093/mnras/stad2316 ISSN 1745-3933.
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Official URL: https://doi.org/10.1093/mnras/stad2316
Abstract
Early observations of transient explosions can provide vital clues to their progenitor origins. In this paper we present the nearby Type Iax (02cx-like) supernova (SN), SN 2020udy that was discovered within hours (∼7 hr) of estimated first light. An extensive dataset of ultra-violet, optical, and near-infrared observations was obtained, covering out to ∼150 d after explosion. SN 2020udy peaked at −17.86 ±0.43 mag in the r band and evolved similarly to other ‘luminous’ SNe Iax, such as SNe 2005hk and 2012Z. Its well-sampled early light curve allows strict limits on companion interaction to be placed. Main-sequence companion stars with masses of 2 and 6 M⊙ are ruled out at all viewing angles, while a helium-star companion is allowed from a narrow range of angles (140–180○ away from the companion). The spectra and light curves of SN 2020udy are in good agreement with those of the ‘N5def’ deflagration model of a near Chandrasekhar-mass carbon-oxygen white dwarf. However, as has been seen in previous studies of similar luminosity events, SN 2020udy evolves slower than the model. Broad-band linear polarisation measurements taken at and after peak are consistent with no polarisation, in agreement with the predictions of the companion-star configuration from the early light curve measurements. The host galaxy environment is low metallicity and is consistent with a young stellar population. Overall, we find the most plausible explosion scenario to be the incomplete disruption of a CO white dwarf near the Chandrasekhar-mass limit, with a helium-star companion.
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 | ||||||||||||||||||||||||||||||||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Astronomical photometry, Polarimetry, Astronomical spectroscopy, Supernovae , Supernovae -- Spectra, White dwarf stars, B stars | ||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||||||||||||||||||||
Publisher: | Oxford University Press | ||||||||||||||||||||||||||||||||||||||||||
ISSN: | 1745-3933 | ||||||||||||||||||||||||||||||||||||||||||
Official Date: | October 2023 | ||||||||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 525 | ||||||||||||||||||||||||||||||||||||||||||
Number: | 1 | ||||||||||||||||||||||||||||||||||||||||||
Page Range: | pp. 1210-1228 | ||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1093/mnras/stad2316 | ||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||||||||||||||
Re-use Statement: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved. | ||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||||||||||||||
Copyright Holders: | © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society | ||||||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 14 November 2023 | ||||||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 14 November 2023 | ||||||||||||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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