Tidal Disruption Flares from Stars on Marginally Bound and Unbound Orbits
| Autor: | Gwanwoo Park, Kimitake Hayasaki |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Supermassive black hole 010504 meteorology & atmospheric sciences Accretion (meteorology) Star (game theory) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Orbital eccentricity Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Type (model theory) 01 natural sciences Polytrope Stars Space and Planetary Science 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Stellar density Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.2001.04548 |
| Popis: | We study the mass fallback rate of tidally disrupted stars on marginally bound and unbound orbits around a supermassive black hole (SMBH) by performing three-dimensional smoothed particle hydrodynamic (SPH) simulations with three key parameters: the star is modeled by a polytrope with two different indexes ($n=1.5$ and $3$). The stellar orbital properties are characterized by five orbital eccentricities ranging from $e=0.98$ to $1.02$ and five different penetration factors ranging from $\beta=1$ to $3$, where $\beta$ represents the ratio of the tidal disruption to pericenter distance radii. We derive analytic formulae for the mass fallback rate as a function of the stellar density profile, orbital eccentricity, and penetration factor. Moreover, two critical eccentricities to classify tidal disruption events (TDEs) into five different types: eccentric ($e Comment: 42 pages 11 figures, accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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