Pedro M. H. Branco
IA / FCUP

Abstract
Signals of stellar origin related to magnetic features on the surface of solar-type stars are one of the biggest challenges for detecting and characterizing other Earths. In particular, this “noise” produces variations in the observed spectral line profiles and positions used to measure the stellar Doppler shifts used to infer the presence of other worlds using the radial velocity method.
We used radial velocities (RV’s) for the Sun as measured using high-resolution spectra from the HELIOS/HARPS-N solar telescope/spectrograph and images from the SDO space mission to calculate the different stellar magnetic activity. We studied already known activity indicators and searched for new ones, trying to understand the implication of magnetic variability on the radial velocity measurements.

2024 November 20, 13:30

IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Classroom)
Rua das Estrelas, 4150-762 Porto