Ana L. C. Soares
The measurement of stellar radial velocities (RV) is currently the most important tool for planetary detections. In particular, the detection of Earth-mass planets requires a final precision of 10 cm/s, close to the grasp but not yet within reach of the most precise instrumentation. In order to optimally extract the information from stellar spectra in the RV calculation, we developed a program, based on the work of Chelli (2000), to measure stellar RV by analysing the spectra in the Fourier Space. I will present the results we obtained by applying the program to stellar CCFs, calibration spectra and stellar spectra. We were able to lower by roughly 30% the dispersion on calibration data, thus beating the noise to unprecedented levels. We also tested the program on spectra of rotating stars, with different rotational velocities, and I will present those results as well.
2011 December 07, 13:30
Centro de Astrofísica da Universidade do Porto (Classroom)
Rua das Estrelas, 4150-762 Porto