The fast rise of the unusual Type IIL/IIb SN 2018ivc

Abstract

We present an analysis of the photometric and spectroscopic dataset of the Type II supernova (SN) 2018ivc in the nearby (10 Mpc) galaxy Messier 77. Thanks to the high cadence of the CHASE survey, we observed the SN rising very rapidly by nearly three magnitudes in five hours (or 18 mag d${}^{-1}$). The $r$-band light curve presents four distinct phases: the maximum light is reached in just one day, then a first, rapid linear decline precedes a short-duration plateau. Finally, a long, slower linear decline lasted for one year. Following a radio rebrightening, we detected SN 2018ivc four years after the explosion. The early spectra show a blue, nearly featureless continuum, but the spectra evolve rapidly: after about 10 days a prominent H$\alpha$ line starts to emerge, with a peculiar profile, but the spectra are heavily contaminated by emission lines from the host galaxy. He I lines, namely $\lambda \lambda$5876,7065, are also strong. On top of the former, a strong absorption from the Na I doublet is visible, indicative of a non-negligible internal reddening. From its equivalent width, we derive a lower limit on the host reddening of $A_V\simeq 1.5$ mag, while from the Balmer decrement and a match of the $B-V$ colour curve of SN 2018ivc to that of the comparison objects, a host reddening of $A_V\simeq 3.0$ mag is obtained. The spectra are similar to those of SNe II, but with strong He lines. Given the peculiar light curve and spectral features, we suggest SN 2018ivc could be a transitional object between the Type IIL and Type IIb SNe classes. In addition, we found signs of interaction with circumstellar medium in the light curve, making SN 2018ivc also an interacting event. Finally, we modelled the early multi-band light curves and photospheric velocity of SN 2018ivc to estimate the explosion and CSM physical parameters.

19 pages, 22 figures, 3 tables, 3 appendices, accepted for publication on A&A

References in corpus (35)

• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Modules for Experiments in Stellar Astrophysics (MESA): Time-Dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure
• Characterizing the V-band light-curves of hydrogen-rich type II supernovae
• A Wolf-Rayet-like progenitor of supernova SN 2013cu from spectral observations of a wind
• PESSTO : survey description and products from the first data release by the Public ESO Spectroscopic Survey of Transient Objects
• Design and operation of the ATLAS Transient Science Server
• SN 2005cs in M51 II. Complete Evolution in the Optical and the Near-Infrared
• Unifying Type II Supernova Light Curves with Dense Circumstellar Material
• Towards Characterization of the Type IIP Supernova Progenitor Population: a Statistical Sample of Light Curves from Pan-STARRS1
• PTF11iqb: Cool supergiant mass loss that bridges the gap between Type IIn and normal supernovae
• Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution
• A Sample of Type II-L Supernovae
• ESC Supernova spectroscopy of non-ESC targets
• Bright, months-long stellar outbursts announce the explosion of interaction-powered supernovae
• Supernova 2013by: A Type IIL Supernova with a IIP-like light curve drop
• SN 2013df, a double-peaked IIb supernova from a compact progenitor and an extended H envelope
• Analysis of blue-shifted emission peaks in type II supernovae
• On the photometric and spectroscopic diversity of Type II supernovae
• Modeling the signatures of interaction in Type II supernovae: UV emission, high-velocity features, broad-boxy profiles
• Constraints on the Progenitor of SN 2016gkg From Its Shock-Cooling Light Curve
• Radii and Mass-loss Rates of Type IIb Supernova Progenitors
• Properties of Type Ibn Supernovae: Implications for the Progenitor Evolution and the Origin of a Population of Rapid Transients
• Observations and analysis of two type IIP supernovae: the intrinsically faint object SN 2005cs and the ambiguous object SN 2005ay
• The Nickel Mass Distribution of Stripped-Envelope Supernovae: Implications for Additional Power Sources
• SN2013fs and SN2013fr: Exploring the circumstellar-material diversity in Type II supernovae
• How much hydrogen is in Type Ib and IIb supernova progenitors?
• Stripped-envelope core-collapse supernova ${}^{56}$Ni masses: Persistently larger values than supernovae type II
• Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068
• Luminous Type II supernovae for their low expansion velocities
• A Multi-Wavelength View on the Rapidly-Evolving Supernova 2018ivc: An Analog of SN IIb 1993J but Powered Primarily by Circumstellar Interaction
• Searching for precursor activity of Type IIn Supernovae
• Resurrection of type IIL supernova 2018ivc: Implications for a binary evolution sequence connecting hydrogen-rich and -poor progenitors
• A Snapshot Survey of Nearby Supernovae with the Hubble Space Telescope
• Optical and spectral observations and hydrodynamic modelling of Type IIb Supernova 2017gpn

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