Cumulative shift of periastron time of binary pulsar with Kozai–Lidov oscillation. (27th April 2019)

• Record Type: Journal Article
• Authors: Suzuki, Haruka; Gupta, Priti; Okawa, Hirotada; Maeda, Kei-ichi
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 486:Number 1(2019)
• Page Start: L52
• Page End: L57
• Publication Date: 2019-04-27
• Subjects: gravitational waves -- binaries (including multiple): close -- stars: black holes -- stars: kinematics and dynamics -- pulsars: general; Astronomy -- Research -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnrasl/slz058
• Languages: English
• ISSNs: 1745-3933

Abstract

ABSTRACT: We study a hierarchical triple system with the Kozai–Lidov mechanism, and analyse the cumulative shift of periastron time of a binary pulsar by the emission of gravitational waves. Time evolution of the osculating orbital elements of the triple system is calculated by directly integrating the first-order post-Newtonian equations of motion. The Kozai–Lidov mechanism will bend the evolution curve of the cumulative shift when the eccentricity becomes large. We also investigate the parameter range of mass and semimajor axis of the third companion with which the bending of the cumulative-shift curve could occur within 100 yr.