Three Core-Collapse Supernovae with Nebular Hydrogen Emission

Abstract

We present SN 2020jfo, a Type IIP supernova in the nearby galaxy M61. Optical light curves from the Zwicky Transient Facility, complemented with data from Swift and near-IR photometry are presented. The 350-day duration bolometric light curve exhibits a relatively short (~ 65 days) plateau. This implies a moderate ejecta mass (~ 5 Msun). A series of spectroscopy is presented, including spectropolarimetric observations. The nebular spectra are dominated by Halpha but also reveal emission lines from oxygen and calcium. Comparisons to synthetic nebular spectra indicate an initial progenitor mass of about 12 Msun. Stable nickel is present in the nebular spectrum, with a super-solar Ni/Fe ratio. Several years of pre-discovery data are examined, but no signs of pre-cursor activity is found. Pre-explosion Hubble Space Telescope imaging reveals a probable progenitor star, detected only in the reddest band and is fainter than expected for stars in the 10 - 15 Msun range, in tension with the analysis of the LC and the nebular spectral modeling. We present two additional core-collapse SNe monitored by the ZTF, which also have nebular Halpha-dominated spectra. This illustrates how the absence or presence of interaction with circumstellar material affect both the LCs and in particular the nebular spectra. Type II SN 2020amv has a LC powered by CSM interaction, in particular after about 40 days when the LC is bumpy and slowly evolving. The late-time spectra show strong Halpha emission with a structure suggesting emission from a thin, dense shell. The evolution of the complex three-horn line profile is reminiscent of that observed for SN 1998S. SN 2020jfv has a poorly constrained early-time LC, but shows a transition from a hydrogen-poor Type IIb to a Type IIn, where the nebular spectrum after the light-curve rebrightening is dominated by Halpha, although with an intermediate line width.

Paper on SN 2020jfo in M61, and on SNe 2020amv and 2020jfv. This is the version resubmitted to A&A after responding to first referee comments. 27 pages, 12 figures. Somewhat shortened abstract

References in corpus (38)

• The Zwicky Transient Facility: System Overview, Performance, and First Results
• K-corrections and filter transformations in the ultraviolet, optical, and near infrared
• Astrophysics Source Code Library
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• An online repository of Swift/XRT light curves of GRBs
• The Zwicky Transient Facility: Science Objectives
• Spectropolarimetry of Supernovae
• Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
• 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
• The Zwicky Transient Facility: Observing System
• The Automated Palomar 60-Inch Telescope
• Fully-Automated Reduction of Longslit Spectroscopy with the Low Resolution Imaging Spectrometer at Keck Observatory
• SN 2004aw: Confirming Diversity of Type Ic Supernovae
• Photometric and Spectroscopic Properties of Type II-P Supernovae
• A large fraction of hydrogen-rich supernova progenitors experience elevated mass loss shortly prior to explosion
• The Standardized Candle Method for Type II Plateau Supernovae
• Late-time spectral line formation in Type IIb supernovae, with application to SN 1993J, SN 2008ax, and SN 2011dh
• The GROWTH Marshal: A Dynamic Science Portal for Time-Domain Astronomy
• A Fully Automated Integral Field Spectrograph Pipeline for the SEDMachine: pysedm
• Bright, months-long stellar outbursts announce the explosion of interaction-powered supernovae
• ZTF Early Observations of Type Ia Supernovae I: Properties of the 2018 Sample
• SN 2006aj Associated with XRF 060218 At Late Phases: Nucleosynthesis-Signature of A Neutron Star-Driven Explosion
• Palomar Gattini-IR: Survey overview, data processing system, on-sky performance and first results
• Supersolar Ni/Fe production in the Type IIP SN 2012ec
• Luminous Type II Short-Plateau Supernovae 2006Y, 2006ai, and 2016egz: A Transitional Class from Stripped Massive Red Supergiants
• A Global Model of The Light Curves and Expansion Velocities of Type II-Plateau Supernovae
• Emission line models for the lowest-mass core collapse supernovae. I: Case study of a 9 $M_{\odot }$ one-dimensional neutrino-driven explosion
• Constraints on explosive silicon burning in core-collapse supernovae from measured Ni/Fe ratios
• Two stripped envelope supernovae with circumstellar interaction -- but only one really shows it
• Supernova Interaction with a Dense Detached Shell in SN 2001em
• A low-energy explosion yields the underluminous Type IIP SN 2020cxd
• SN 2018gjx reveals that some SNe Ibn are SNe IIb exploding in dense circumstellar material
• The low-luminosity type II SN\,2016aqf: A well-monitored spectral evolution of the Ni/Fe abundance ratio
• SN 2018ijp: the explosion of a stripped-envelope star within a dense H-rich shell?
• Constraining the X-ray - Infrared spectral index of second-timescale flares from SGR1935+2154 with Palomar Gattini-IR
• A low-luminosity core-collapse supernova very similar to SN 2005cs

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