Hydrodynamical interaction of mildly relativistic ejecta with an ambient medium

Abstract

Hydrodynamical interaction of spherical ejecta freely expanding at mildly relativistic speeds into an ambient cold medium is studied in semi-analytical and numerical ways to investigate how ejecta produced in energetic stellar explosions dissipate their kinetic energy through the interaction with the surrounding medium. We especially focus on the case in which the circumstellar medium is well represented by a steady wind at a constant mass-loss rate having been ejected from the stellar surface prior to the explosion. As a result of the hydrodynamical interaction, the ejecta and circumstellar medium are swept by the reverse and forward shocks, leading to the formation of a geometrically thin shell. We present a semi-analytical model describing the dynamical evolution of the shell and compare the results with numerical simulations. The shell can give rise to bright emission as it gradually becomes transparent to photons. while it is optically thick. We develop an emission model for the expected emission from the optically thick shell, in which photons in the shell gradually diffuse out to the interstellar space. Then, we investigate the possibility that radiation powered by the hydrodynamical interaction is the origin of an underluminous class of gamma-ray bursts.

arXiv comment24 pages, 11 figures, accepted for publication in ApJ

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• Ultrahigh-energy cosmic-ray nuclei and neutrinos from engine-driven supernovae
• Radio emission from the cocoon of a GRB jet: implications for relativistic supernovae and off-axis GRB emission
• Relativistic supernova ejecta colliding with a circumstellar medium: an application to the low-luminosity GRB 171205A
• Broad-band emission properties of central engine powered supernova ejecta interacting with a circumstellar medium
• 1000 days of lowest frequency emission from the low-luminosity GRB 171205A
• Signatures of Exploding Supermassive PopIII Stars at High Redshift in JWST, EUCLID and Roman Space Telescope