Aspherical Supernovae: Effects on Early Light Curves

Abstract

Early light from core-collapse supernovae, now detectable in high-cadence surveys, holds clues to a star and its environment just before it explodes. However, effects that alter the early light have not been fully explored. We highlight the possibility of non-radial flows at the time of shock breakout. These develop in sufficiently non-spherical explosions if the progenitor is not too diffuse. When they do develop, non-radial flows limit ejecta speeds and cause ejecta-ejecta collisions. We explore these phenomena and their observational implications, using global, axisymmetric, non-relativistic FLASH simulations of simplified polytropic progenitors, which we scale to representative stars. We develop a method to track photon production within the ejecta, enabling us to estimate band-dependent light curves from adiabatic simulations. Immediate breakout emission becomes hidden as an oblique flow develops. Non-spherical effects lead the shock-heated ejecta to release a more constant luminosity at a higher, evolving color temperature at early times, effectively mixing breakout light with the early light curve. Collisions between non-radial ejecta thermalize a small fraction of the explosion energy; we address emission from these collisions in a subsequent paper.

arXiv comment23 pages, 20 figures, Accepted for publication in ApJ

References in corpus (36)

• Binary interaction dominates the evolution of massive stars
• Stability of Standing Accretion Shocks, With an Eye Toward Core Collapse Supernovae
• The Expulsion of Stellar Envelopes in Core-Collapse Supernovae
• Observed Fractions of Core-Collapse Supernova Types and Initial Masses of their Single and Binary Progenitor Stars
• Shock Breakout in Dense Mass Loss: Luminous Supernovae
• The Magnetorotational Instability in Core Collapse Supernova Explosions
• Spectropolarimetry of Supernovae
• Early supernovae light-curves following the shock-breakout
• The early UV/Optical emission from core-collapse supernovae
• On Validating an Astrophysical Simulation Code
• Relativistic shock breakouts - a variety of gamma-ray flares: from low luminosity gamma-ray bursts to type Ia supernovae
• A non-spherical core in the explosion of supernova SN 2004dj
• Ejection of the massive Hydrogen-rich envelope timed with the collapse of the stripped SN2014C
• Early-time light curves of Type Ib/c supernovae from the SDSS-II Supernova Survey
• Trans-Relativistic Blast Waves in Supernovae as Gamma-Ray Burst Progenitors
• Fast radiation mediated shocks and supernova shock breakouts
• Is it Round? Spectropolarimetry of the Type II-P Supernova 1999em
• Panchromatic Observations of SN 2011dh Point to a Compact Progenitor Star
• Shock Breakout and Early Light Curves of Type II-P Supernovae Observed with Kepler
• The Double-Peaked SN2013ge: a Type Ib/c SN with an Asymmetric Mass Ejection or an Extended Progenitor Envelope
• Aspherical Core-Collapse Supernovae in Red Supergiants Powered by Nonrelativistic Jets
• Shock Breakout in Type II Plateau Supernovae: Prospects for High Redshift Supernova Surveys
• Non-relativistic radiation mediated shock breakouts: II. Bolometric properties of SN shock breakout
• The Transitional Stripped-Envelope SN 2008ax: Spectral Evolution and Evidence for Large Asphericity
• Aspherical Supernova Shock Breakout and the Observations of Supernova 2008D
• Non-relativistic radiation mediated shock breakouts: I. Exact bolometric planar breakout solutions
• Non-relativistic radiation mediated shock breakouts: III. Spectral properties of SN shock breakout
• Supernova Properties from Shock Breakout X-rays
• Oblique Shock Breakout in Supernovae and Gamma-Ray Bursts: I. Dynamics and Observational Implications
• Spectropolarimetry of SN 2011dh in M51: geometric insights on a Type IIb supernova progenitor and explosion
• Shock wave structure in astrophysical flows with an account of photon transfer
• 2D radiaition-hydrodynamic simulations of supernova shock breakout in bipolar explosions of a blue supergiant progenitor
• Near-Infrared Knots and Dense Fe Ejecta in the Cassiopeia A Supernova Remnant
• Probing Explosion Geometry of Core-collapse Supernovae with Light Curves of the Shock Breakout
• Oblique Shock Breakout in Supernovae and Gamma-Ray Bursts: II. Numerical Solutions For Non-Relativistic Pattern Speeds
• Light Curves and Spectra from a Unimodal Core-Collapse SuperNova

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