Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8241
Title: SN2019wxt: An Ultrastripped Supernova Candidate Discovered in the Electromagnetic Follow-up of a Gravitational Wave Trigger
Authors: Shivkumar, Hinna
Jaodand, Amruta D.
Balasubramanian, Arvind
Fremling, Christoffer
Corsi, Alessandra
Tzanidakis, Anastasios
Nissanke, Samaya
Kasliwal, Mansi
Brightman, Murray
Raaijmakers, Geert
Madsen, Kristin Kruse
Harrison, Fiona
Carbone, Dario
Nayana, A. J
Désert, Jean-Michel
Andreoni, Igor
Keywords: Core-collapse supernovae
Supernovae
Ejecta
Stellar remnants
Gravitational wave sources
X-ray sources
X-ray astronomy
Radio interferometry
Extragalactic radio sources
Spectral line identification
Transient detection
Transient sources
Issue Date: 20-Jul-2023
Publisher: American Astronomical Society
Citation: The Astrophysical Journal, Vol. 952, No. 1, 86
Abstract: We present optical, radio, and X-ray observations of a rapidly evolving transient SN2019wxt (PS19hgw), discovered during the search for an electromagnetic counterpart to the gravitational-wave (GW) trigger S191213g. Although S191213g was not confirmed as a significant GW event in the off-line analysis of LIGO-Virgo data, SN2019wxt remained an interesting transient due to its peculiar nature. The optical/near-infrared (NIR) light curve of SN2019wxt displayed a double-peaked structure evolving rapidly in a manner analogous to currently known ultrastripped supernovae (USSNe) candidates. This double-peaked structure suggests the presence of an extended envelope around the progenitor, best modeled with two components: (i) early-time shock-cooling emission and (ii) late-time radioactive 56Ni decay. We constrain the ejecta mass of SN2019wxt at Mej ≈ 0.20M⊙, which indicates a significantly stripped progenitor that was possibly in a binary system. We also followed up SN2019wxt with long-term Chandra and Jansky Very Large Array observations spanning ∼260 days. We detected no definitive counterparts at the location of SN2019wxt in these long-term X-ray and radio observational campaigns. We establish the X-ray upper limit at 9.93 × 10−17 erg cm−2 s−1 and detect an excess radio emission from the region of SN2019wxt. However, there is little evidence for SN1993J- or GW170817-like variability of the radio flux over the course of our observations. A substantial host-galaxy contribution to the measured radio flux is likely. The discovery and early-time peak capture of SN2019wxt in optical/NIR observations during EMGW follow-up observations highlight the need for dedicated early, multiband photometric observations to identify USSNe.
Description: Open Access
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
URI: http://hdl.handle.net/2248/8241
ISSN: 1538-4357
Appears in Collections:IIAP Publications



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