Post-Newtonian Kozai-Lidov mechanism and its effect on cumulative shift of periastron time of binary pulsar

Haruka Suzuki, Priti Gupta, Hirotada Okawa, Kei Ichi Maeda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We study the Kozai-Lidov mechanism in a hierarchical triple system in detail by the direct integration of the first-order post-Newtonian equations of motion. We analyse a variety of models with a pulsar to evaluate the cumulative shift of the periastron time of a binary pulsar caused by the gravitational wave emission in a hierarchical triple system with Kozai-Lidov mechanism. We compare our results with those by the double-averaging method. The deviation in the eccentricity, even if small, is important in the evaluation of the emission of the gravitational waves. We also calculate the cumulative shift of the periastron time by using obtained osculating orbital elements. If Kozai-Lidov oscillations occur, the cumulative shift curve will bend differently from that of the isolated binary. If such a bending is detected through the radio observation, it will be the first indirect observation of gravitational waves from a triple system.

Original languageEnglish
Pages (from-to)1645-1665
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume500
Issue number2
DOIs
Publication statusPublished - 2021 Jan 1
Externally publishedYes

Keywords

  • Binaries: close
  • Gravitational waves
  • Pulsars: general
  • Stars: black holes
  • Stars: kinematics and dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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