| Name: Rohan Raha |
| Affiliation: Indian Institute of Science, Bangalore |
| Conference ID: ASI2026_1094 |
| Title: Collapse of a massive star leading to a black hole: Supernova Accretion Disk |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Rohan Raha(Indian Institute of Science, Bangalore - 560012, India), Banibrata Mukhopadhyay(Indian Institute of Science, Bangalore - 560012, India), Pawan Kumar(University of Texas at Austin, 78712-USA) |
| Abstract: Long-duration gamma-ray bursts (GRBs) originate from collapsing massive stars that form rapidly spinning black holes, launching relativistic jets via the Blandford-Znajek mechanism. However, fundamental questions persist: Why do only ~1% of Type Ic core-collapse supernovae produce GRBs? What determines the remarkable diversity in GRB properties—durations spanning 1 to >10⁴ seconds, luminosities ranging from 10⁴⁶ to 10⁵⁴ erg s⁻¹, and supernova energies varying by over an order of magnitude?
We present a 3D general relativistic magnetohydrodynamic (GRMHD) parameter survey using H-AMR to simulate selected collapsar models. We systematically vary progenitor density profiles, stellar radii, black hole spin, magnetic field strengths, and angular momentum distributions. Each simulation follows the complete evolution from black hole formation through self-consistent jet launching to stellar surface breakout, covering 10-100 seconds of physical time.
Our simulations will provide the first systematic theoretical framework explaining the complete GRB-supernova phenomenology through first-principles calculations. We present preliminary results demonstrating how stellar structure critically determines jet survival and properties, quantify energy deposition mechanisms in supernova ejecta. This work represents a significant step toward understanding the physical origin of cosmic explosions. |
