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25 April 2024

» arxiv » 1604.2367

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Microarcsecond VLBI pulsar astrometry with PSRPI I. Two binary millisecond pulsars with white dwarf companions
A. T. Deller ; S. J. Vigeland ; D. L. Kaplan ; W. M. Goss ; W. F. Brisken ; S. Chatterjee ; J. M. Cordes ; G. H. Janssen ; T. J. W. Lazio ; L. Petrov ; B. W. Stappers ; A. Lyne ;
Date:	8 Apr 2016
Abstract:	Model-independent distance constraints to binary millisecond pulsars (MSPs) are of great value to both the timing observations of the radio pulsars, and multiwavelength observations of their companion stars. Very Long Baseline Interferometry (VLBI) astrometry can be employed to provide these model-independent distances with very high precision via the detection of annual geometric parallax. Using the Very Long Baseline Array, we have observed two binary millisecond pulsars, PSR J1022+1001 and J2145-0750, over a two-year period and measured their distances to be 700 +14 -10 pc and 613 +16 -14 pc respectively. We use the well-calibrated distance in conjunction with revised analysis of optical photometry to tightly constrain the nature of their massive (M ~ 0.85 Msun) white dwarf companions. Finally, we show that several measurements of their parallax and proper motion obtained by pulsar timing array projects are incorrect, and investigate possible causes for the discrepancy.
Source:	arXiv, 1604.2367
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