What the... I had heard that exoplanets were found before 1995 orbiting pulsars though 1995 is considered the year of the first proof of an exoplanet, but i didn't know they were this small. I just consulted my favorite exoplanet site where all known exoplanets are listet and i found one the mass of Pluto.
http://exoplanet.eu/planet.php?p1=PSR+1257%2B12&p2=b
But how could we detect exoplanets back in 1992? Are exoplanets or exocomets easier to detect when they are orbiting pulsars? Can't see why this is so - unless they cover for the big flash the pulsars make. But the mass of Pluto, wow.
Edit: Gliese 876 d is considered to be the smallest exoplanet to date AFAIK, with a mass of 2.3% of Jupiters mass, found in 2005.
But what about an exoplanet that covers all the three areas stated at once?
COROT shouldn't be cableable of detecting exoplanets the size of Earth with the exception of exoplanets oribiting very close to their parent star. My guess is that Kepler will be the first one to detect the first exoEarth, though i of course would hope it would be COROT
