K2 space observations recently found that three super-Earths transit the nearby M dwarf K2-3. The apparent brightness and the small
physical radius of their host star rank these planets amongst the most favourable for follow-up characterisations. The outer planet
orbits close to the inner edge of the habitable zone and might become one of the first exoplanets searched for biomarkers using
transmission spectroscopy.We used the HARPS velocimeter to measure the mass of the planets. The mass of planet b is 8:4 2:1 M ,
while our determination of those planets c and d are a ected by the stellar activity. With a density of 4:32+2:0
0:76 g cm3, planet b is
probably mostly rocky, but it could contain up to 50% water.
en_US
Patrocinador
dc.description.sponsorship
NASA Science Mission directorate NAS5-26555
NASA Office of Space Science NNX09AF08G
CONICYT Becas-Chile 72120460
European Research Council 337591-ExTrA
Fundacao para a Ciencia e a Tecnologia (FCT) through Investigador FCT IF /00169/2012
"Programa Operacional de Factores de Competitividade -COMPETE"