Dynamics and Gravitational Wave Signature of Collapsar Formation

TL;DR

This paper presents detailed 3+1 general relativistic simulations of rotating stellar core collapse, revealing a distinctive gravitational wave signature linked to the early collapsar formation phase.

Contribution

It introduces a comprehensive simulation framework incorporating realistic progenitors and rotation, capturing the entire collapsar evolution and gravitational wave emission.

Findings

Identified a unique gravitational wave signature during early collapsar formation.

Simulated collapse, bounce, black hole formation, and hyperaccretion phases.

Provided insights into gravitational wave signals for long gamma-ray bursts.

Abstract

We perform 3+1 general relativistic simulations of rotating core collapse in the context of the collapsar model for long gamma-ray bursts. We employ a realistic progenitor, rotation based on results of stellar evolution calculations, and a simplified equation of state. Our simulations track self-consistently collapse, bounce, the postbounce phase, black hole formation, and the subsequent early hyperaccretion phase. We extract gravitational waves from the spacetime curvature and identify a unique gravitational wave signature associated with the early phase of collapsar formation.