Brown Dwarf Companions to G-Type Stars. I. Gliese 417B and Gliese 584C
Brown Dwarf Companions to G-Type Stars. I. Gliese 417B and Gliese 584C
We present astrometric and spectroscopic observations confirming that two nearby G dwarf systems (Gliese 417 = BD+36 2162 and Gliese 584AB = eta CrB AB) have a widely separated, L dwarf, substellar companion. Using age estimates of the G dwarf primaries, we estimate masses for these L dwarfs from theoretical …