SN 2020bio: A Double-peaked, H-poor Type IIb Supernova with Evidence of Circumstellar Interaction

Abstract

We present photometric and spectroscopic observations of SN 2020bio, a double-peaked Type IIb supernova (SN) discovered within a day of explosion, primarily obtained by Las Cumbres Observatory and Swift. SN 2020bio displays a rapid and long-lasting initial decline throughout the first week of its light curve, similarly to other well-studied Type IIb SNe. This early-time emission is thought to originate from the cooling of the extended outer hydrogen-rich (H-rich) envelope of the progenitor star that is shock heated by the SN explosion. We compare SN 2020bio to a sample of other double-peaked Type IIb SNe in order to investigate its progenitor properties. Analytical model fits to the early-time emission give progenitor radius ($\approx$ 100--1500 $R_{\odot }$) and H-rich envelope mass ($\approx$ 0.01--0.5 $M_{\odot }$) estimates that are consistent with other Type IIb SNe. However, SN 2020bio displays several peculiarities, including: (1) weak H spectral features indicating a greater amount of mass loss than other Type IIb progenitors; (2) an underluminous secondary light-curve peak that implies a small amount of synthesized ${}^{56}$Ni ($M_{\text{Ni}}$ $\approx$ 0.02 $M_{\odot }$); and (3) low-luminosity nebular [O I] and interaction-powered nebular features. These observations are more consistent with a lower-mass progenitor ($M_{\text{ZAMS}}\approx$ 12 $M_{\odot }$) that was stripped of most of its H-rich envelope before exploding. This study adds to the growing diversity in the observed properties of Type IIb SNe and their progenitors.

arXiv comment23 pages, 15 figures, published in ApJ

References in corpus (68)

• Array Programming with NumPy
• emcee: The MCMC Hammer
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• The Swift Ultra-Violet/Optical Telescope
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• The u'g'r'i'z' Standard Star Network
• ATLAS: A High-Cadence All-Sky Survey System
• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• Mass Loss: Its Effect on the Evolution and Fate of High-Mass Stars
• WISeREP - An Interactive Supernova Data Repository
• Nucleosynthesis and Remnants in Massive Stars of Solar Metallicity
• Determining the Type, Redshift, and Age of a Supernova Spectrum
• A Digital Archive of HI 21 cm Line Spectra of Optically-targeted Galaxies
• An Empirical Relation between Sodium Absorption and Dust Extinction
• Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
• The diversity of Type II supernova versus the similarity in their progenitors
• Design and operation of the ATLAS Transient Science Server
• Bolometric light curves and explosion parameters of 38 stripped-envelope core-collapse supernovae
• The massive binary companion star to the progenitor of supernova 1993J
• From Shock Breakout to Peak and Beyond: Extensive Panchromatic Observations of the Type Ib Supernova 2008D associated with Swift X-ray Transient 080109
• A comparative modeling of supernova 1993J
• Radiation hydrodynamics of SN 1987A: I. Global analysis of the light curve for the first 4 months
• Theoretical light curves for deflagration models of Type Ia supernova
• SOUSA: the Swift Optical/Ultraviolet Supernova Archive
• Precursors prior to Type IIn supernova explosions are common: precursor rates, properties, and correlations
• The early UV/Optical emission from core-collapse supernovae
• PTF11eon/SN2011dh: Discovery of a Type IIb Supernova From a Compact Progenitor in the Nearby Galaxy M51
• The Yellow Supergiant Progenitor of the Type II Supernova 2011dh in M51
• Gemini Spectroscopy of Supernovae from SNLS: Improving High Redshift SN Selection and Classification
• Optical and Infrared Spectroscopy of the type IIn SN 1998S : Days 3-127
• The Carnegie Supernova Project I: analysis of stripped-envelope supernova light curves
• Measuring the Progenitor Masses and Dense Circumstellar Material of Type II Supernovae
• The bolometric light curves and physical parameters of stripped-envelope supernovae
• A large fraction of hydrogen-rich supernova progenitors experience elevated mass loss shortly prior to explosion
• Late-time spectral line formation in Type IIb supernovae, with application to SN 1993J, SN 2008ax, and SN 2011dh
• Optical and near-infrared observations of SN 2011dh - The first 100 days
• Supernovae with Two Peaks in the Optical Light Curve and the Signature of Progenitors with Low-mass Extended Envelopes
• Analyzing the Largest Spectroscopic Dataset of Stripped Supernovae to Improve Their Identifications and Constrain Their Progenitors
• The Type IIb Supernova 2013df and Its Cool Supergiant Progenitor
• Panchromatic Observations of SN 2011dh Point to a Compact Progenitor Star
• Bright, months-long stellar outbursts announce the explosion of interaction-powered supernovae
• A Binary Progenitor for the Type IIb Supernova 2011dh in M51
• A Diversity of Wave-driven Pre-supernova Outbursts
• UV/Optical emission from the expanding envelopes of type II supernovae
• SN 2013df, a double-peaked IIb supernova from a compact progenitor and an extended H envelope
• Constraints on the Progenitor of SN 2016gkg From Its Shock-Cooling Light Curve
• The progenitor and early evolution of the Type IIb SN 2016gkg
• Shock Cooling Emission from Extended Material Revisited
• Luminous Type II Short-Plateau Supernovae 2006Y, 2006ai, and 2016egz: A Transitional Class from Stripped Massive Red Supergiants
• SN 2019ehk: A Double-Peaked Ca-rich Transient with Luminous X-ray Emission and Shock-Ionized Spectral Features
• SN2019dge: a Helium-rich Ultra-Stripped Envelope Supernova
• A physically motivated classification of stripped-envelope supernovae
• Supernova Nebular Spectroscopy Suggests a Hybrid Envelope-Stripping Mechanism for Massive Stars
• Bolometric and UV Light Curves of Core-Collapse Supernovae
• Wave-driven outbursts and variability of low-mass supernova progenitors
• ZTF18aalrxas: A Type IIb Supernova from a very extended low-mass progenitor
• SN 2016coi (ASASSN-16fp): an energetic H-stripped core-collapse supernova from a massive stellar progenitor with large mass loss
• The Circumstellar Environments of Double-Peaked, Calcium-strong Supernovae 2021gno and 2021inl
• SN 2018gjx reveals that some SNe Ibn are SNe IIb exploding in dense circumstellar material
• The origin of the H$\alpha$-like structure in nebular spectra of type IIb supernovae
• A Multi-Wavelength View on the Rapidly-Evolving Supernova 2018ivc: An Analog of SN IIb 1993J but Powered Primarily by Circumstellar Interaction
• SN2017jgh - A high-cadence complete shock cooling lightcurve of a SN IIb with the Kepler telescope
• SN 2017czd: A Rapidly Evolving Supernova from a Weak Explosion of a Type IIb Supernova Progenitor

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