Abstract
Despite extensive Doppler searches, no companions of Jupiter, or Brown Dwarf, mass have been found within a few AU of more than 100 late-type stars and, for many, astrometry suggests that there are none in larger orbits either. Terrestrial-mass companions have been found for the millisecond pulsar PSR1257+12. I also consider what improvements in optical spectroscopic techniques would allow us to detect stellar companions of Uranus-mass.
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Wolszczan, A., submitted toScience 1994 March 1.
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Walker, G.A.H. Doppler searches for planetary systems. Astrophys Space Sci 223, 103–107 (1995). https://doi.org/10.1007/BF00989160
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DOI: https://doi.org/10.1007/BF00989160