Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...27....1g&link_type=abstract
Icarus, vol. 27, Jan. 1976, p. 1-12.
Astronomy and Astrophysics
Astronomy
20
Astrometry, Extrasolar Planets, Planetary Systems, Binary Stars, Instrument Errors, M Stars, Planetary Mass, Stellar Mass, Stellar Motions, Tables (Data)
Scientific paper
Recent advances in astrometric measuring and reduction procedures could be used to detect possible Jovian-mass planets in the vicinity of more than a dozen of the sun's nearest stellar neighbors. The sample of stars which at present could be subjected to a meaningful astrometric study is large enough to give a statistical indication of the frequency of companion objects with masses of about one Jupiter, with a reasonable opportunity of detecting even smaller masses. To date, in the opinion of the author, no suggested extrasolar substellar mass (mass less than 0.01 solar mass) has yet been confirmed, although some proposed systems will await further study. A compilation of positions of Barnard's star determined with the Allegheny and Van Vleck refractors and corrected positions determined with the Sproul refractor is suggestive of a gravitational interaction of the star and one or more Jovian-mass planets. Systematic errors may still exist in the major body of data. The construction of a highly stable astrometric instrument would augment recent advances in measuring and reduction procedures, significantly increasing the ability to survey our stellar neighbors for evidence of planetary companions.
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