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Precision ephimerides for gravitational-wave searches.I. sco X-1
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Galloway, Duncan K., Premachandra, Sammanani, Steeghs, D., Marsh, Tom, Casares, Jorge and Cornelisse, Rémon (2013) Precision ephimerides for gravitational-wave searches.I. sco X-1. The Astrophysical Journal, Volume 781 (Number 1). p. 14. doi:10.1088/0004-637X/781/1/14 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/781/1/14
Abstract
Rapidly rotating neutron stars are the only candidates for persistent high-frequency gravitational wave emission, for which a targeted search can be performed based on the spin period measured from electromagnetic (e.g., radio and X-ray) observations. The principal factor determining the sensitivity of such searches is the measurement precision of the physical parameters of the system. Neutron stars in X-ray binaries present additional computational demands for searches due to the uncertainty in the binary parameters. We present the results of a pilot study with the goal of improving the measurement precision of binary orbital parameters for candidate gravitational wave sources. We
observed the optical counterpart of Sco X-1 in 2011 June with the William Herschel Telescope and also made use
of Very Large Telescope observations in 2011 to provide an additional epoch of radial-velocity measurements to
earlier measurements in 1999. From a circular orbit fit to the combined data set, we obtained an improvement of a
factor of 2 in the orbital period precision and a factor of 2.5 in the epoch of inferior conjunction T0. While the new orbital period is consistent with the previous value of Gottlieb et al., the new T0 (and the amplitude of variation of the Bowen line velocities) exhibited a significant shift, which we attribute to variations in the emission geometry with epoch. We propagate the uncertainties on these parameters through to the expected Advanced LIGO-Virgo
detector network observation epochs and quantify the improvement obtained with additional optical observations.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 30 December 2013 | ||||||||
| Dates: |
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| Volume: | Volume 781 | ||||||||
| Number: | Number 1 | ||||||||
| Page Range: | p. 14 | ||||||||
| DOI: | 10.1088/0004-637X/781/1/14 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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