The velocity distribution of outflows driven by choked jets in stellar envelopes

ABSTRACT Many stripped envelope supernovae (SNe) present a signature of high-velocity material responsible for broad absorption lines in the observed spectrum. These include SNe that are associated with long gamma-ray bursts (LGRBs) and low-luminosity GRBs (llGRBs), not GRBs. Recently it was suggested this originates from cocoon is driven by relativistic jet. In LGRBs, jet breaks out successfully stellar envelope, while llGRBs choked. Here we use numerical simulations to explore velocity distribution an outflow choked jet, its dependence on progenitor properties. We find all cases where too deep within star, carries roughly constant amount energy per logarithmic scale proper over wide range velocities, which depends mostly volume at time breakout. This universal property jets outflows, does exist outflows spherically symmetric explosions or when very star. therefore conclude (not deep) provide natural explanation fast seen early spectra properties could reveal information otherwise hidden jets.