A new formation channel for double neutron stars without recycling: Implications for gravitational wave detection

Krzysztof Belczyński*, Vassiliki Kalogera

*Corresponding author for this work

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

We report on a new evolutionary path leading to the formation of close double neutron stars (NSs), with the unique characteristic that none of the two NSs ever had the chance to be recycled by accretion. The existence of this channel stems from the evolution of helium-rich stars (cores of massive NS progenitors), which has been neglected in most previous studies of double compact object formation. We find that these nonrecycled NS-NS binaries are formed from bare carbon-oxygen cores in tight orbits, with formation rates comparable to or maybe even higher than those of recycled NS-NS binaries. On the other hand, their detection probability as binary pulsars is greatly reduced (by ∼103) relative to recycled pulsars because of their short lifetimes. We conclude that, in the context of gravitational wave detection of NS-NS in-spiral events, this new type of binaries calls for an increase of the rate estimates derived from the observed NS-NS systems with recycled pulsars, typically by factors of 1.5-3 or even higher.

Original languageEnglish (US)
Pages (from-to)L183-L187
JournalAstrophysical Journal
Volume550
Issue number2 PART 2
DOIs
StatePublished - Apr 1 2001

Keywords

  • Binaries: close
  • Gravitational waves
  • Stars: evolution
  • Stars: formation
  • Stars: neutron

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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