Our proposal aims are foccused on:
1) to modify the current PAIX photometer status from Astro-Concordia
program (Site characterization) to a new and purely astrophysical status.
2) to perform and install a new instrument, a high resolution spectrograph
EXPLORER (EXoplanets, PuLsatiOn amp; high REsolution spectRoscopy). PAIX photometer takes benefit from the most striking Dome C properties where long and continuous timeseries observations are possible during 150 « days », allowing unprecedented frequency resolution which have been only attained by space mission such as CoRoT or Kepler. Several rank A publications have been issued thanks to PAIX. EXPLORER spectrograph is a new instrumental program which will also take benefit of continuous and uninterrupted observations linked to excellent transparency skies which can be found only at Dome C. EXPLORER allows us to collect long and uninterrupted spectroscopic data-bases are which until now has never been done even with space telescope. EXPLORER will complete and challenge the space mission GAIA. EXPLORER will make a major contribution in stellar pulsation and evolution in resolving some enigmas connected to Blazhko modulations, hydrodynamical and loss-mass phenomena in evolved stars (pulsation period more than 100 days) which remains a great mystery, and to complement PAIX in studies of the pulsation mode detection of P-mode in read giant stars. EXPLORER will also complement the spectroscopic observation of the GAIA mission on the topic of determining the basic parameters and chemical abundances of stars with long pulsation period and galactic distances. EXPLORER will allow us as well to better characterize the transit detection made with ASTEP. Once a transit is detected by ASTEP, EXPLORER will help to validate the existence of a new exoplanet.