LESIA - Observatoire de Paris

Insigths into stars and their environment with Kepler data

Thursday 2 December 2010, by Savita Mathur (High Altitude Observatory, Boulder, USA )

Tuesday 14 December 2010 à 11h00 , Lieu : Salle de conférence du bât. 17

Seismology is the best tool that we have to probe the solar and stellar interiors. Many results have been obtained with the Sun, such as its structure, its rotation, and its magnetic activity. Asteroseismology has progressed the last ten years thanks to ground-based observations and space missions (WIRE, MOST).
In 2006, a big change occurred thanks to CoRoT allowing the observation of a few tens of solar-like stars and few hundreds of red giants during 150 days. In many of these stars, acoustic modes could be detected and studied leading to estimation of mass, radius, age, and magnetic activity for some of these stars. A bigger revolution started with the NASA Kepler mission. Indeed it led to a drastic change in term of quality and quantity of data by observing thousands of stars for at least 3.5 years. Primarily intended to search for transiting exoplanets, more specifically Earth-like planets around Solar-like stars, Kepler data are also perfect for asteroseismic analyses. Indeed, the exquisite data provided by Kepler are now allowing us to perform analyses as an "ensemble asteroseismology", to investigate scaling laws, stellar activity, and to test stellar evolution theory even inside clusters. On the other hand, detailed studies of host stars provide very valuable information to the exoplanet search. We can determine very accurately the size of the star, therefore of the planet, fix the habitable zone around a star, and estimate the age of the planetary system.
In this talk, we will show and discuss the most interesting and exciting results obtained in asteroseismology with CoRoT and Kepler as well as their impact on their environment and the exoplanet search as exoplanet search and asteroseismology have to be studied hand to hand.