The morphing of decay powered to interaction powered Type II supernova ejecta at nebular times

Abstract

Much excitement surrounds the intense mass loss that seems to take place in some massive stars immediately before core collapse. However, occurring too late, it has a negligible impact on the star's evolution or the final yields, which are influenced instead by the longer-term, quasi-steady mass loss taking place during H and He burning. Late-time observations of core-collapse supernovae interacting with the progenitor wind are one means to constrain this secular mass loss. Here, we present radiative transfer calculations for a Type II SN with and without this interaction power, focusing on the phase between 350 and 1000d after explosion. Without interaction power, the ejecta are powered through radioactive decay whose exponential decline produces an ever-fading SN. Instead, with a constant interaction power of $10^{40}$ erg s${}^{-1}$ (representative of an SN II ramming into a steady-state $10^{-6}{M}_{\odot }$ yr${}^{-1}$ wind), the spectrum morphs from decay powered at 350d, with narrow lines forming in the inner metal-rich ejecta, to interaction powered at 1000d, with broad boxy lines forming in the outer H-rich ejecta. Intermediate times are characterized by a hybrid and complex spectrum made of overlapping narrow and broad lines. While interaction boosts primarily the flux in the ultraviolet, which remains largely unobserved today, a knee in the $R$-band light curve or a $U$-band boost are clear signatures of interaction at late times. The model predictions compare favorably with a number of Type II supernovae including SN 2004et or SN 2017eaw at 500-1000d after explosion.

arXiv commentsubmitted to A&A

References in corpus (55)

• Core-Collapse Supernovae from 9 to 120 Solar Masses Based on Neutrino-powered Explosions
• Pre-Supernova Evolution of Massive Single and Binary Stars
• WISeREP - An Interactive Supernova Data Repository
• The effect of massive binaries on stellar populations and supernova progenitors
• Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
• Berkeley Supernova Ia Program I: Observations, Data Reduction, and Spectroscopic Sample of 582 Low-Redshift Type Ia Supernovae
• The Distance to SN 1999em in NGC 1637 from the Expanding Photosphere Method
• Evidence for Asphericity in the Type IIn Supernova 1998S
• High Density Circumstellar Interaction in the Luminous Type IIn SN 2010jl: The first 1100 days
• Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J
• The first month of evolution of the slow rising type II-P SN 2013ej in M74
• Photometric and spectroscopic evolution of the type IIP supernova SN 2004et
• Ejection of the massive Hydrogen-rich envelope timed with the collapse of the stripped SN2014C
• Radio Emission and Particle Acceleration in SN 1993J
• Time Dependent Radiative Transfer Calculations for Supernovae
• The 44Ti-powered spectrum of SN 1987A
• Optical and near infrared coverage of SN 2004et: physical parameters and comparison with other type IIP supernovae
• Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution
• A Sample of Type II-L Supernovae
• Optical Spectroscopy of Supernova 1993J During Its First 2500 Days
• Final Moments I: Precursor Emission, Envelope Inflation, and Enhanced Mass loss Preceding the Luminous Type II Supernova 2020tlf
• Explosion of red-supergiant stars: influence of the atmospheric structure on shock breakout and the early-time supernova radiation
• Numerical simulations of super-luminous supernovae of type IIn
• Towards a better understanding of the evolution of Wolf-Rayet stars and Type Ib/Ic supernova progenitors
• Optical Signatures of Circumstellar Interaction in Type IIP Supernovae
• Hubble Space Telescope and Ground-Based Observations of SN 1993J and SN 1998S: CNO Processing in the Progenitors
• SN 2007od: A Type IIP SN with Circumstellar Interaction
• Supernova 2013by: A Type IIL Supernova with a IIP-like light curve drop
• Late-Time Optical Emission From Core-Collapse Supernovae
• Swift and Chandra Detections of Supernova 2006jc: Evidence for Interaction of the Supernova Shock with a Circumstellar Shell
• The Type IIP SN 2007od in UGC 12846: from a bright maximum to dust formation in the nebular phase
• The multi-faceted Type II-L supernova 2014G from pre-maximum to nebular phase
• Strong late-time circumstellar interaction in the peculiar supernova iPTF14hls
• SN~1991T: Reflections of Past Glory
• The Type II-Plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor
• 450 Days of Type II SN 2013ej in Optical and Near-Infrared
• Spectra of supernovae in the nebular phase
• Modeling the signatures of interaction in Type II supernovae: UV emission, high-velocity features, broad-boxy profiles
• The Berkeley sample of Type II supernovae: BVRI light curves and spectroscopy of 55 SNe II
• Evolutionary tracks for Betelgeuse
• Photometric and Spectroscopic Evolution of the Type IIP SN 2007it to Day 944
• Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio
• Radio emission and nonlinear diffusive shock acceleration of cosmic rays in the supernova SN 1993J
• Radiative-transfer modeling of nebular-phase type II supernovae. Dependencies on progenitor and explosion properties
• Impact of clumping on core-collapse supernova radiation
• Detection of Late-Time Circumstellar Interaction of SN 2017eaw in NGC 6946
• Stripped-Envelope Stars in Different Metallicity Environments I. Evolutionary Phases, Classification and Populations
• The disappearances of six supernova progenitors
• SN 2017ivv: two years of evolution of a transitional Type II supernova
• The Transition of a Type IIL Supernova into a Supernova Remnant: Late-time Observations of SN 2013by
• BVRI Photometry of the Classic Type II-P Supernova 2017eaw in NGC 6946: Day 3 to Day 594
• The Late Time Optical Evolution of Twelve Core-Collapse Supernovae: Detection of Normal Stellar Winds
• Toward a better understanding of supernova environments: a study of SNe 2004dg and 2012P in NGC 5806 with HST and MUSE
• Using Shell Models to Investigate Clumping in the WN4 Star HD 50896
• Using LSST late-time photometry to constrain Type Ibc supernovae and their progenitors

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