The dynamics of debris streams from tidal disruption events: exact solutions, critical stream density, and hydrogen recombination

نویسندگان

چکیده

A star destroyed by a supermassive black hole (SMBH) in tidal disruption event (TDE) is transformed into filamentary structure known as tidally disrupted stellar debris stream. We show that when ideal gas pressure dominates the thermodynamics of stream, there an exact solution to hydrodynamics equations describes stream evolution and accounts for self-gravity, pressure, dynamical expansion gas, transverse analyze stability this cylindrically symmetric perturbations, critical density below which unstable not self-gravitating; factor at least 40-50 smaller than TDE. Above overstable, self-gravity confines oscillation period exponentially long, growth rate overstability scales $t^{1/6}$. The power-law small index implies effectively stable perturbations. also use effects hydrogen recombination, suggest even though recombination substantially increases entropy, it likely incapable completely destroying influence self-gravity. transient produced far less luminous previous estimates.

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ژورنال

عنوان ژورنال: Monthly Notices of the Royal Astronomical Society

سال: 2023

ISSN: ['0035-8711', '1365-8711', '1365-2966']

DOI: https://doi.org/10.1093/mnras/stad1347