Journal Article

A white dwarf companion to the relativistic pulsar PSR J1141−6545*

J. Antoniadis, C. G. Bassa, N. Wex, M. Kramer and R. Napiwotzki

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 1, pages 580-584
Published in print March 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17929.x
A white dwarf companion to the relativistic pulsar PSR J1141−6545*

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Pulsars with compact companions in close eccentric orbits are unique laboratories for testing general relativity and alternative theories of gravity. Moreover, they are excellent targets for future gravitational wave experiments like LISA and they are also highly important for understanding the equation of state of superdense matter and the evolution of massive binaries. Here we report on optical observations of the 1.02 M companion to the pulsar PSR J1141−6545. We detect an optical counterpart with apparent magnitudes V= 25.08(11) and R= 24.38(14), consistent with the timing position of the pulsar. We demonstrate that our results are in agreement with a white dwarf companion. However the latter is redder than expected and the inferred values are not consistent with the theoretical cooling tracks, preventing us from deriving the exact age. Our results confirm the importance of the PSR J1141−6545 system for gravitational experiments.

Keywords: binaries: close; stars: individual: PSR J1141−6545; stars: neutron; pulsars: general; white dwarfs

Journal Article.  3213 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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