Improving the VLBI astrometry of PSR 0437-4715

Details Improving the VLBI astrometry of PSR 0437-4715 Improving the VLBI astrometry of PSR 0437-4715

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atnf.prop.2161d&link_type=abstract

ATNF proposal V190, Semester: April, 2009

Computer Science

Galactic, Lba

Scientific paper

PSR J0437-4715 is in a binary system with a white dwarf companion, and is the subject of an ongoing pulsar timing campaign that has measured the position, proper motion and orbital period derivative of the pulsar to very high precision. This timing data can be combined with an independent distance to place limits of the rate of change of Newton's gravitational constant G. We have already measured the VLBI parallax of 0437-4715 to better than 1% precision (the highest precision pulsar distance measurement ever made) with only four observations, which has enabled us to place a limit on the rate of change of G which is a factor of 2 less precise than the best published limitation, from Lunar Laser Ranging (LLR). Three further VLBI observations will lower the uncertainty of our proper motion measurement and should double the existing parallax precision, which along with the ongoing pulsar timing will enable a measurement of the rate of change of G that equals or betters the present LLR limit.

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