An extremely energetic supernova from a very massive star in a dense medium

Abstract

The interaction of a supernova with a circumstellar medium (CSM) can dramatically increase the emitted luminosity by converting kinetic energy to thermal energy. In 'superluminous' supernovae (SLSNe) of Type IIn -- named for narrow hydrogen lines in their spectra -- the integrated emission can reach $\sim 10^{51}$ erg, attainable by thermalising most of the kinetic energy of a conventional SN. A few transients in the centres of active galaxies have shown similar spectra and even larger energies, but are difficult to distinguish from accretion onto the supermassive black hole. Here we present a new event, SN2016aps, offset from the centre of a low-mass galaxy, that radiated $\gtrsim 5\times 10^{51}$ erg, necessitating a hyper-energetic supernova explosion. We find a total (SN ejecta $+$ CSM) mass likely exceeding 50-100 M${}_{\odot }$, with energy $\gtrsim 10^{52}$ erg, consistent with some models of pair-instability supernovae (PISNe) or pulsational PISNe -- theoretically-predicted thermonuclear explosions from helium cores $>50$ M${}_{\odot }$. Independent of the explosion mechanism, this event demonstrates the existence of extremely energetic stellar explosions, detectable at very high redshifts, and provides insight into dense CSM formation in the most massive stars.

Published in Nature Astronomy, 13 April 2020

References in corpus (19)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Asymptotic Equivalence of Bayes Cross Validation and Widely Applicable Information Criterion in Singular Learning Theory
• Binary interaction dominates the evolution of massive stars
• Pulsational Pair-Instability Supernovae
• SN 2006gy: An extremely luminous supernova in the galaxy NGC 1260
• The magnetar model for Type I superluminous supernovae I: Bayesian analysis of the full multicolour light curve sample with MOSFiT
• SN 2006tf: Precursor Eruptions and the Optically Thick Regime of Extremely Luminous Type IIn Supernovae
• Fully-Automated Reduction of Longslit Spectroscopy with the Low Resolution Imaging Spectrometer at Keck Observatory
• The Superluminous Transient ASASSN-15lh as a Tidal Disruption Event from a Kerr Black Hole
• Rapid formation of large dust grains in the luminous supernova SN 2010jl
• How much 56Ni can be produced in Core-Collapse Supernovae? : Evolution and Explosions of 30 - 100 Msun Stars
• Super-luminous supernovae at redshifts of 2.05 and 3.90
• Energetic eruptions leading to a peculiar hydrogen-rich explosion of a massive star
• Numerical simulations of super-luminous supernovae of type IIn
• Zooming In on the Progenitors of Superluminous Supernovae With the HST
• The IPAC Image Subtraction and Discovery Pipeline for the intermediate Palomar Transient Factory
• A population of highly energetic transient events in the centres of active galaxies
• Interacting supernovae from photoionization-confined shells around red supergiant stars
• Massive Stellar Mergers as Precursors of Hydrogen-rich Pulsational Pair Instability Supernovae

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