Effect of stellar rotation on the development of post-shock instabilities during core-collapse supernovae
| Autor: | A-C. Buellet, T. Foglizzo, J. Guilet, E. Abdikamalov |
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| Přispěvatelé: | HEP, INSPIRE, Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science FOS: Physical sciences Astronomy and Astrophysics Astrophysics - High Energy Astrophysical Phenomena [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph] Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Astron.Astrophys. Astron.Astrophys., 2023, 674, pp.A205. ⟨10.1051/0004-6361/202245799⟩ |
| Popis: | The growth of instabilities is key to trigger a supernova explosion during the phase of stalled shock, immediately after the birth of a proto-neutron star (PNS). We assess the effect of stellar rotation on neutrino-driven convection and SASI when neutrino heating is taken into account. Rotation affects the frequency of the mode m=2 detectable with gravitational waves (GW). We use a linear stability analysis in the equatorial plane between the PNS and the stationary shock and consider a large range of specific angular momenta, neutrino luminosities and mass accretion rates. The nature of the dominant instability depends on the convection parameter chi and the rotation rate. Convective modes with chi>=5 are hampered by differential rotation. At smaller chi, however, mixed SASI-convective modes with a large angular scale m=1,2,3 benefit from rotation and become dominant for relatively low rotation rates at which centrifugal effects are small. For rotation rates >0.3 Keplerian rotation at the PNS surface (KPNS), the growth rate of the dominant mode depends weakly on neutrino heating which highlights a new instability regime. Its frequency is surprisingly independent of the heating rate, with a strong prograde spiral m=2 dominating over a large parameter range, favourable to the production of GW. A simple linear relation exists between the dominant oscillation frequency and the specific angular momentum. Three regimes are distinguished. For rotation rates 17 pages, 17 figures, accepted by A&A |
| Databáze: | OpenAIRE |
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