Repulsion of fallback matter due to central energy source in supernova

PASJ: Publications of the Astronomical Society of Japan

Kashiyama, Kazumi¹  Shigeyama, Toshikazu¹ 

[1] Research Center for the Early Universe, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

关键词: accretion, accretion disks;    hydrodynamics;    stars: neutron;    (stars:) pulsars: general;    (stars:) supernovae: general;   

DOI  :  10.1093/pasj/psy108

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

The flow of fallback matter being shocked and repelled back by an energy deposition from a central object is discussed using newly found self-similar solutions. We show that there exists a maximum mass-accretion rate if the adiabatic index of the flow is less than or equal to 4/3. Otherwise, we can find a solution with an arbitrarily large accretion rate by appropriately shrinking the energy deposition region. Applying the self-similar solution to supernova fallback, we discuss how the fate of newborn pulsars or magnetars depends on the fallback accretion and their spin-down power. Combining the maximum accretion rate with the condition for the fallback accretion to bury the surface magnetic field into the crust, we argue that supernova fallback with a rate of |$\dot{M}_{\rm fb} \sim 10^{-(4\mbox{-}6)}\, M_{\odot }\:$|s−1 could be the main origin of the diversity of Galactic young neutron stars, i.e., rotation-powered pulsars, magnetars, and central compact objects.

【 授权许可】

CC BY