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EPRV Asteroseismology of the K dwarfs GJ 570 A and GJ 783 A with ESPRESSO. Empirical mode-amplitude scaling in tension with 3D convection simulations
T. L. Campante, Y. Zhou, Y. Li +21
Solar-like oscillations in K dwarfs have intrinsically low amplitudes, making them challenging to detect in space-based photometry. The advent of Extremely Precise Radial Velocity…
Expanding the frontiers of cool-dwarf asteroseismology with ESPRESSO. Detection of solar-like oscillations in the K5 dwarf Indi
T. L. Campante, H. Kjeldsen, Y. Li +25
Fuelled by space photometry, asteroseismology is vastly benefitting the study of cool main-sequence stars, which exhibit convection-driven solar-like oscillations. Even so, the tin…
Optical and near-infrared stellar activity characterization of the early M dwarf Gl~205 with SOPHIE and SPIRou
P. Cortes-Zuleta, I. Boisse, B. Klein +41
The stellar activity of M dwarfs is the main limitation for discovering and characterizing exoplanets orbiting them since it induces quasi-periodic RV variations. We aim to charact…
Optimising the H index for the identification of activity signals in FGK stars. Improvement of the correlation between H and CaII H&K
J. Gomes da Silva, A. Bensabat, T. Monteiro +1
In this work we investigate the effect of the H bandpass width in the correlation between the CaII H&K and H indices with the aim of improving the H index to better identi…
On the long-term correlation between the flux in the Ca II H & K and Halpha lines for FGK stars
J. Gomes da Silva, N. C. Santos, I. Boisse +2
The re-emission in the cores of the Ca II H & K and H lines, are well known proxies of stellar activity. However, these activity indices probe different activity phenomena, the…
Long-term magnetic activity of a sample of M-dwarf stars from the HARPS program II. Activity and radial velocity
J. Gomes da Silva, N. C. Santos, X. Bonfils +5
Due to their low mass and luminosity, M dwarfs are ideal targets if one hopes to find low-mass planets similar to Earth by using the radial velocity (RV) method. However, stellar m…
Long-term magnetic activity of a sample of M-dwarf stars from the HARPS program I. Comparison of activity indices
J. Gomes da Silva, N. C. Santos, X. Bonfils +3
Aims. Other stars are known to have magnetic cycles similar to that of the Sun. The relationship between these activity variations and the observed radial-velocity is still not sat…