Classical Spin-Orbit Coupling and Periastron Advance in PSR J0045–7319

AbstractRadio timing observations of the SMC binary pulsar PSR J0045–7319 show, for the first time in a binary pulsar, that classical spin-orbit coupling and periastron advance are occurring. From the observations, the angle θ between the B star spin axis and the orbital angular momentum is constrained to be 25° < θ < 41° (Kaspi et al. 1996b). Under the conventional assumption that the pre-supernova angular momenta were aligned, this provides direct evidence for an asymmetric supernova explosion. In addition, a large, unexpected orbital decay is observed in the system.

Download Full-text

Classical spin orbit coupling in a deformed potential

Nuclear Physics A ◽

10.1016/0375-9474(92)90488-6 ◽

1992 ◽

Vol 545 (1-2) ◽

pp. 497-509 ◽

Cited By ~ 8

Author(s):

P. Rozmej ◽

R. Arvieu

Keyword(s):

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Classical Spin

Download Full-text

N3LO gravitational spin-orbit coupling at order G4

Journal of High Energy Physics ◽

10.1007/jhep07(2021)115 ◽

2021 ◽

Vol 2021 (7) ◽

Author(s):

Michèle Levi ◽

Andrew J. McLeod ◽

Matthew von Hippel

Keyword(s):

Effective Field Theory ◽

Dimensional Regularization ◽

Effective Field ◽

Compact Objects ◽

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Transcendental Numbers ◽

Integration Techniques ◽

First Time

Abstract In this paper we derive for the first time the N3LO gravitational spin-orbit coupling at order G4 in the post-Newtonian (PN) approximation within the effective field theory (EFT) of gravitating spinning objects. This represents the first computation in a spinning sector involving three-loop integration. We provide a comprehensive account of the topologies in the worldline picture for the computation at order G4. Our computation makes use of the publicly-available EFTofPNG code, which is extended using loop-integration techniques from particle amplitudes. We provide the results for each of the Feynman diagrams in this sector. The three-loop graphs in the worldline picture give rise to new features in the spinning sector, including divergent terms and logarithms from dimensional regularization, as well as transcendental numbers, all of which survive in the final result of the topologies at this order. This result enters at the 4.5PN order for maximally-rotating compact objects, and together with previous work in this line, paves the way for the completion of this PN accuracy.

Download Full-text

Timing of the Binary Pulsar B1259–63

Symposium - International Astronomical Union ◽

10.1017/s0074180900181550 ◽

2004 ◽

Vol 218 ◽

pp. 429-430

Author(s):

N. Wang ◽

S. Johnston ◽

R. N. Manchester

Keyword(s):

Major Axis ◽

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Semi Major Axis ◽

Timing Behavior ◽

Binary Pulsar ◽

Orbital Parameters ◽

Secular Changes ◽

Period Variations

This paper summarizes the results of 13 years of timing observations of a unique binary pulsar, B1259–63, which has a massive B2e star companion. A small glitch in the pulsar period apparently occurred in 1997 Aug, not long after the 1997 periastron. We found that spin-orbit coupling with secular changes in periastron longitude and projected semi-major axis cannot account for the observed period variations. A model in which step changes in pulsar orbital parameters occur at each periastron accounts best for the observed timing behavior.

Download Full-text

Electronic Spectrum of the N80Se Molecule in the Region 2840–3200 Å

Canadian Journal of Physics ◽

10.1139/p71-247 ◽

1971 ◽

Vol 49 (15) ◽

pp. 2033-2051 ◽

Cited By ~ 9

Author(s):

L. Harding ◽

W. E. Jones ◽

K. K. Yee ◽

A. Jenouvrier ◽

D. Daumont ◽

...

Keyword(s):

Electronic Spectrum ◽

Ground State ◽

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Rotational Analysis ◽

Coupling Constant ◽

Molecular Constants ◽

First Time

The vibrational and rotational analysis of 12 red degraded bands of N80Se, in the region 2800 to 3200 Å, is reported. These bands are attributed to two progressions, ν′ = 1 and ν′ = 2, of the subsystem C2Δ5/2–X2Π3/2 and to two progressions, ν′ = 0, of the system B2Σ–X2Π(a).Tables of molecular constants of the observed states are given. For the first time it has been possible to calculate the spin–orbit coupling constant, Aeff, of the ground state, X2Π(a).

Download Full-text