Hydrodynamic Simulations of Disrupted Planetary Accretion Discs Inside the Core of an AGB Star
| Autor: | G Guidarelli, Zhuo Chen, Jonathan Carroll-Nellenback, Jason Nordhaus, Baowei Liu, Eric G. Blackman, Adam Frank, Luke Chamandy |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
media_common.quotation_subject White dwarf FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Giant star Magnetic field Common envelope Astrophysics - Solar and Stellar Astrophysics Accretion disc Space and Planetary Science Sky Asymptotic giant branch Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Jupiter mass Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) media_common |
| DOI: | 10.48550/arxiv.1908.00157 |
| Popis: | Volume complete sky surveys provide evidence for a binary origin for the formation of isolated white dwarfs with magnetic fields in excess of a MegaGauss. Interestingly, not a single high-field magnetic white dwarf has been found in a detached system suggesting that if the progenitors are indeed binaries, the companion must be removed or merge during formation. An origin scenario consistent with observations involves the engulfment, inspiral, and subsequent tidal disruption of a low-mass companion in the interior of a giant star during a common envelope phase. Material from the shredded companion forms a cold accretion disc embedded in the hot ambient around the proto-white dwarf. Entrainment of hot material may evaporate the disc before it can sufficiently amplify the magnetic field, which typically requires at least a few orbits of the disc.Using three-dimensional hydrodynamic simulations of accretion discs with masses between 1 and 10 times the mass of Jupiter inside the core of an Asymptotic Giant Branch star, we find that the discs survive for at least 10 orbits (and likely for 100 orbits), sufficient for strong magnetic fields to develop. Comment: Submitted to MNRAS |
| Databáze: | OpenAIRE |
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