SN 2020udy: an SN Iax with strict limits on interaction consistent with a helium-star companion

Maguire, K ORCID: 0000-0002-9770-3508, Magee, MR ORCID: 0000-0002-0629-8931, Leloudas, G, Miller, AA ORCID: 0000-0001-9515-478X, Dimitriadis, G ORCID: 0000-0001-9494-179X, Pursiainen, M ORCID: 0000-0003-4663-4300, Bulla, M ORCID: 0000-0002-8255-5127, De, K, Gal-Yam, A, Perley, DA ORCID: 0000-0001-8472-1996, Fremling, C, Karambelkar, VR, Nordin, J, Reusch, S, Schulze, S ORCID: 0000-0001-6797-1889, Sollerman, J ORCID: 0000-0003-1546-6615, Terreran, G ORCID: 0000-0003-0794-5982, Yang, Y ORCID: 0000-0002-6535-8500, Bellm, EC, Groom, SL et al (2023) SN 2020udy: an 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. ISSN 0035-8711

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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 h) of estimated first light. An extensive data set 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 polarization measurements taken at and after peak are consistent with no polarization, 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:	Article
Uncontrolled Keywords:	0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press
Date of acceptance:	27 July 2023
Date of first compliant Open Access:	3 January 2024
Date Deposited:	03 Jan 2024 15:07
Last Modified:	04 Jul 2025 15:00
DOI or ID number:	10.1093/mnras/stad2316
URI:	https://researchonline.ljmu.ac.uk/id/eprint/22164

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