Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dda....41.0405f&link_type=abstract
American Astronomical Society, DDA meeting #41, #4.05; Bulletin of the American Astronomical Society, Vol. 41, p.928
Physics
Scientific paper
CoRoT-7b was the first super-Earth for which mass and radius have been determined and is one paradigm for the study of the physics of hot-super-Earths fixing constraints to models of their formation and evolution. It is thus important to have good radius and mass determinations. The radius determination from the transits observed by the space telescope CoRoT is 11,000 ± 600 km (Leger et al. 2009), a value that may be improved by future observations (by reducing the uncertainties in the star radius, for instance), but which magnitude is nevertheless definitively established. The mass determination, however (4.8 ± 0.8 Earth masses; Queloz et al. 2009), is very uncertain. This is due to the fact that the 1-Gyr old G9V star CoRoT 7 is active. The variation in the measured radial velocity comes mainly from the activity of the star, whose dark spots alter the value of the measured radial velocity. This activity follows roughly the rotation period of the star (23.64 days) but in a very irregular way. Thus, CoRoT 7b is also the paradigm of the kind of problems that may be expected to be faced when planets with Earth-like masses are discovered. One of the aims of the reported investigation is to use CoRoT-7, for which an excellent set with 109 HARPS radial velocity measurements exist, to explore the techniques that may be used when dealing with super-Earths around active stars. We may wish that future discoveries are done around more quiets stars, but Earth-like planets are too important and we are not allowed to discard them because of the central star activity. The reported results indicate that the exoplanets CoRoT-7b and CoRoT-7c are more massive than found in previous determinations.
Beauge Christian
dos Santos Tadeu M.
Ferraz-Mello Sylvio
Michtchenko Tatiana A.
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