| Autor: |
Xiaoshan Huang, Shane W. Davis, Yan-fei Jiang |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
The Astrophysical Journal, Vol 974, Iss 2, p 165 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/ad6c39 |
| Popis: |
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 $10{\dot{M}}_{\mathrm{Edd}}$ , the stream–stream collision can occur multiple times and drive strong outflows of up to $9{\dot{M}}_{\mathrm{Edd}}$ . By dispersing gas to ≳100 r _s , 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 ∼10 ^44 erg s ^−1 for days. The luminosity is generally sub-Eddington and shows a weak correlation with accretion rate at early times. The outflow is optically thick, yielding a reprocessing layer with a size of ∼10 ^14 cm and photospheric temperature of ∼4 × 10 ^4 K. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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