Eccentric tidal disruption event discs around supermassive black holes: dynamics and thermal emission
| Autor: | J. J. Zanazzi, Gordon I. Ogilvie |
|---|---|
| Přispěvatelé: | Ogilvie, Gordon [0000-0002-7756-1944], Apollo - University of Cambridge Repository |
| Rok vydání: | 2020 |
| Předmět: |
Elliptic orbit
Stellar mass Astrophysics::High Energy Astrophysical Phenomena black hole physics FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences 7. Clean energy Tidal disruption event 0103 physical sciences Eccentric 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics Supermassive black hole 010308 nuclear & particles physics Apsidal precession Dynamics (mechanics) Astronomy and Astrophysics Accretion (astrophysics) radiation mechanisms: thermal 13. Climate action Space and Planetary Science hydrodynamics accretion accretion discs Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena stars: black holes |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 499:5562-5577 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa3127 |
| Popis: | After the Tidal Disruption Event (TDE) of a star around a SuperMassive Black Hole (SMBH), if the stellar debris stream rapidly circularizes and forms a compact disk, the TDE emission is expected to peak in the soft X-ray or far Ultra-Violet (UV). The fact that many TDE candidates are observed to peak in the near UV and optical has challenged conventional TDE emission models. By idealizing a disk as a nested sequence of elliptical orbits which communicate adiabatically via pressure forces, and are heated by energy dissipated during the circularization of the nearly parabolic debris streams, we investigate the dynamics and thermal emission of highly eccentric TDE disks, including the effect of General-Relativistic apsidal precession from the SMBH. We calculate the properties of uniformly precessing, apsidally aligned, and highly eccentric TDE disks, and find highly eccentric disk solutions exist for realistic TDE properties (SMBH and stellar mass, periapsis distance, etc.). Taking into account compressional heating (cooling) near periapsis (apoapsis), we find our idealized eccentric disk model can produce emission consistent with the X-ray and UV/Optical luminosities of many optically bright TDE candidates. Our work attempts to quantify the thermal emission expected from the shock-heating model for TDE emission, and finds stream-stream collisions are a promising way to power optically bright TDEs. Comment: 16 pages, 11 figures, accepted to MNRAS |
| Databáze: | OpenAIRE |
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