Have planetary scientists discovered an exoplanet below 10 Earth masses in the habtable zone of a star?

Answer 1

planets orbiting gliese 581, named gliese 581 C (blackbody 40 C, the same as venus) and D (blackbody -18 C, same as earth) could be in the habitable zone of the star. however, they are superdense at being about 7 g/cm^3 (this opposed to earth at 5.5g/cm^3) their minimum masses are 5.5 and 7.1 earth masses respectively.