Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.212..251l&link_type=abstract
Astrophysics and Space Science, vol. 212, nos. 1-2, p. 251-260
Astronomy and Astrophysics
Astrophysics
6
Extrasolar Planets, Radio Stars, Stellar Orbits, Astrometry, Detection, Displacement, Precision, Radio Emission, Searching, Very Long Base Interferometry
Scientific paper
The displacement of a radio-emitting star around the barycenter of a possible planetary system can be measured by astrometric very long baseline interferometry (VLBI) observations. We have observed the radio-emitting star sigma2 CrB at 8 epochs over 5 years by VLBI and fitted its 5 astrometric parameters to the observed coordinates. The post-fit coordinate residuals have and rms scatter of 0.22 milliarcseconds and show no systematic behavior. We use this result to set a limit on the presence of planets around sigma2 CrB and conclude that our present VLBI astrometric precision corresponds to the threshold to detect a Jupiter-like planet around this star. We also discuss the astrometric monitoring program of 11 radio-emitting stars that we are conducting for the Hipparcos space mission and its possible contribution to a long-term planet search program.
Jones Llanwyn D.
Lestrade Jean-Francois
Phillips Robert B.
Preston A. R. A. R.
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