Maund, JR, Yang, Y, Steele, IA, Baade, D, Jermak, H, Schulze, S, Bruch, R, Gal-Yam, A, Hoflich, PA, Ofek, E, Wang, X, Amenouche, M, Dekany, R, Masci, FJ, Riddle, R and Soumagnac, MT (2021) RINGO3 polarimetry of very young ZTF supernovae. Monthly Notices of the Royal Astronomical Society, 503 (1). pp. 312-323. ISSN 0035-8711

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Abstract

The early phases of the observed evolution of the supernovae (SNe) are expected to be dominated by the shock breakout and ‘flash’ ionization of the surrounding circumstellar medium. This material arises from the last stages of the evolution of the progenitor, such that photometry and spectroscopy of SNe at early times can place vital constraints on the latest and fastest evolutionary phases leading up to stellar death. These signatures are erased by the expansion of the ejecta within ∼5 d after explosion. Here we present the earliest constraints, to date, on the polarization of 10 transients discovered by the Zwicky Transient Facility (ZTF), between 2018 June and 2019 August. Rapid polarimetric follow-up was conducted using the Liverpool Telescope RINGO3 instrument, including three SNe observed within <1 d of detection by the ZTF. The limits on the polarization within the first 5 d of explosion, for all SN types, is generally <2per cent⁠, implying early asymmetries are limited to axial ratios >0.65 (assuming an oblate spheroidal configuration). We also present polarimetric observations of the Type I Superluminous SN 2018bsz and Type II SN 2018hna, observed around and after maximum light.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords:	Astronomy & Astrophysics; EMISSION; Physical Sciences; Science & Technology; SPECTROPOLARIMETRY; supernovae: general; techniques: polarimetric; UV; Science & Technology; Physical Sciences; Astronomy & Astrophysics; techniques: polarimetric; supernovae: general; EMISSION; SPECTROPOLARIMETRY; UV; Astronomy & Astrophysics; 0201 Astronomical and Space Sciences
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press
SWORD Depositor:	A Symplectic
Date Deposited:	08 Nov 2022 10:14
Last Modified:	08 Nov 2022 10:15
DOI or ID number:	10.1093/mnras/stab391
URI:	https://researchonline.ljmu.ac.uk/id/eprint/18061

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