Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 462, Issue 3, Pages 2918-2933Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1850
Keywords
binaries: general; pulsars: individual: PSR J0024-7204P; pulsars: individual: PSR J0024-7204V; pulsars: individual: PSR J0024-7204W; pulsars: individual: PSR J0024-7201X; globular clusters: individual: 47 Tucanae
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Funding
- European Research Council BEACON [279702]
- Bonn-Cologne Graduate School of Physics and Astronomy
- NSERC
- Alexander von Humboldt Fellowship
- European Research Council under European Union/ERC [337062]
- STFC [ST/L000768/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000768/1] Funding Source: researchfish
- Division Of Physics
- Direct For Mathematical & Physical Scien [1430284] Funding Source: National Science Foundation
- Office of Integrative Activities
- Office Of The Director [1458952] Funding Source: National Science Foundation
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For the past couple of decades, the Parkes radio telescope has been regularly observing the millisecond pulsars in 47 Tucanae (47 Tuc). This long-term timing programme was designed to address a wide range of scientific issues related to these pulsars and the globular cluster where they are located. In this paper, the first of a series, we address one of these objectives: the characterization of four previously known binary pulsars for which no precise orbital parameters were known, namely 47 Tuc P, V, W and X (pulsars 47 Tuc R and Y are discussed elsewhere). We determined the previously unknown orbital parameters of 47 Tuc V and X and greatly improved those of 47 Tuc P and W. For pulsars W and X we obtained, for the first time, full coherent timing solutions across the whole data span, which allowed a much more detailed characterization of these systems. 47 Tuc W, a well-known tight eclipsing binary pulsar, exhibits a large orbital period variability, as expected for a system of its class. 47 Tuc X turns out to be in a wide, extremely circular, 10.9-d long binary orbit and its position is similar to 3.8 arcmin away from the cluster centre, more than three times the distance of any other pulsar in 47 Tuc. These characteristics make 47 Tuc X a very different object with respect to the other pulsars of the cluster.
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