2024/04/29 by Xiaoshan Huang, Huang, Xiaoshan, Shane W. Davis +3 · 5 citations
Environmental Science · #Atmospheric and Environmental Gas Dynamics #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Methane Hydrates and Related Phenomena
paper · pdf · doi:10.48550/arxiv.2404.18446
openalex publication_date 2024/04/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The rising part of a tidal disruption event light curve provides unique insight into early emission and the onset of accretion. Various mechanisms are proposed to explain the pre-peak emission, including shocks from debris interaction and reprocessing of disk emission. We study the pre-peak emission and its influence on the gas circularization by a series of gray radiation hydrodynamic simulations with varying black hole mass. We find that given a super-Eddington fallback rate of 10MEdd, the stream-stream collision can occur multiple times and drive strong outflows of up to 9MEdd. By dispersing gas to \gtrsim 100rs, the outflow can delay gas circularization and leads to sub-Eddington accretion rates during the first few stream-stream collisions. The stream-stream collision shock and circularization shock can sustain a luminosity of ~1044erg/s for days. The luminosity is generally sub-Eddington and shows a weak correlation with accretion rate at early time. The outflow is optically thick, yielding a reprocessing layer with a size of ~1014 cm and photospheric temperature of ~4×104K.