Repulsion of fallback matter due to central energy source in supernova

Toshikazu Shigeyama, Kazumi Kashiyama

Research output: Contribution to journalArticlepeer-review


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 M fb ∼ 10−(4-6) M 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.

Original languageEnglish
Article numberpsy108
JournalPublications of the Astronomical Society of Japan
Issue number6
Publication statusPublished - 2018 Dec 1
Externally publishedYes


  • Accretion
  • Accretion disks
  • Hydrodynamics
  • Pulsars: general
  • Stars: neutron
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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