Discovery of Three Wide-orbit Binary Pulsars: Implications for Binary Evolution and Equivalence Principles
Astrophysics, abstract
astro-ph/0506188
From: Ingrid Stairs [view email]
Date: Wed, 8 Jun 2005 23:02:10 GMT (175kb)
Discovery of Three Wide-orbit Binary Pulsars: Implications for Binary
Evolution and Equivalence Principles
Authors:
I. H. Stairs,
A. J. Faulkner,
A. G. Lyne,
M. Kramer,
D. R. Lorimer,
M. A. McLaughlin,
R. N. Manchester,
G. B. Hobbs,
F. Camilo,
A. Possenti,
M. Burgay,
N. D’Amico,
P. C. Freire,
P. C. Gregory
Comments: 8 pages; accepted to ApJ
We report the discovery of three binary millisecond pulsars during the Parkes
Multibeam Pulsar Survey of the Galactic Plane. The objects are highly recycled
and are in orbits of many tens of days about low-mass white-dwarf companions.
The eccentricity of one object, PSR J1853+1303, is more than an order of
magnitude lower than predicted by the theory of convective fluctuations during
tidal circularization. We demonstrate that, under the assumption that the
systems are randomly oriented, current theoretical models of the
core-mass–orbital-period relation for the progenitors of these systems likely
overestimate the white-dwarf masses, strengthening previous concerns about the
match of these models to the data. The new objects allow us to update the
limits on violation of relativistic equivalence principles to 95% confidence
upper limits of 5.5 x 10^-3 for the Strong Equivalence Principle parameter
Delta and 4.0 x 10^-20 for the Lorentz-invariance/momentum-conservation
parameter alpha_3.
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