THE SPIN RATE of PRE-COLLAPSE STELLAR CORES: WAVE-DRIVEN ANGULAR MOMENTUM TRANSPORT in MASSIVE STARS

Jim Fuller, Matteo Cantiello, Daniel Lecoanet, Eliot Quataert

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

The core rotation rates of massive stars have a substantial impact on the nature of core-collapse (CC) supernovae and their compact remnants. We demonstrate that internal gravity waves (IGWs), excited via envelope convection during a red supergiant phase or during vigorous late time burning phases, can have a significant impact on the rotation rate of the pre-SN core. In typical (10 M ≲ M ≲ 20 M) supernova progenitors, IGWs may substantially spin down the core, leading to iron core rotation periods Pmin,Fe ≳ 30 s. Angular momentum (AM) conservation during the supernova would entail minimum NS rotation periods of Pmin,NS ≳ 3 ms. In most cases, the combined effects of magnetic torques and IGW AM transport likely lead to substantially longer rotation periods. However, the stochastic influx of AM delivered by IGWs during shell burning phases inevitably spin up a slowly rotating stellar core, leading to a maximum possible core rotation period. We estimate maximum iron core rotation periods of Pmax,Fe ≲ 5 × 103 s in typical CC supernova progenitors, and a corresponding spin period of Pmax,NS ≲ 500 ms for newborn neutron stars (NSs). This is comparable to the typical birth spin periods of most radio pulsars. Stochastic spin-up via IGWs during shell O/Si burning may thus determine the initial rotation rate of most NSs. For a given progenitor, this theory predicts a Maxwellian distribution in pre-collapse core rotation frequency that is uncorrelated with the spin of the overlying envelope.

Original languageEnglish (US)
Article number101
JournalAstrophysical Journal
Volume810
Issue number2
DOIs
StatePublished - Sep 10 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • stars: interiors
  • stars: massive
  • stars: neutron
  • stars: oscillations (including pulsations)
  • stars: rotation
  • waves

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