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Star-Planet Interactions: Observational Techniques and Methods
P. Figueira, H. Korhonen, A. Buccino +8
This chapter summarizes the techniques and methods used to study star-planet interaction (SPI) from the observational point of view. SPI can produce a wide range of observational s…
Stellar signal components seen in HARPS and HARPS-N solar radial velocities
K. Al Moulla, X. Dumusque, P. Figueira +3
Context. Radial velocity (RV) measurements induced by the presence of planets around late-type stars are contaminated by stellar signals that are of the order of a few meters per s…
TOI-1278 B: SPIRou unveils a rare Brown Dwarf Companion in Close-In Orbit around an M dwarf
Étienne Artigau, Guillaume Hébrard, Charles Cadieux +39
We present the discovery of an M brown dwarf (BD) companion to the M0V star TOI-1278. The system was first identified through a percent-deep transit in TESS…
Stellar chromospheric activity of 1,674 FGK stars from the AMBRE-HARPS sample I. A catalogue of homogeneous chromospheric activity
J. Gomes da Silva, N. C. Santos, V. Adibekyan +9
We present a catalogue of homogeneous determined chromospheric emission (CE), stellar atmospheric parameters and ages for 1,674 FGK main sequence (MS), subgiant, and giant stars. T…
The Tc trend in the Zetta Reticuli system: N spectra - N trends
V. Adibekyan, P. Figueira, E. Delgado Mena +4
It is suggested that the chemical abundance trend with the condensation temperature, Tc , can be a signature of rocky planet formation or accretion. Recently, a strong Tc trend was…
Evidence of a substellar companion around a very young T Tauri star
P. Viana Almeida, J. F. Gameiro, P. P. Petrov +4
We present results from a Near Infrared multi-epoch spectroscopic campaign to detect a young low-mass companion to a T Tauri star. AS 205A is a late-type dwarf (~K5) of ~1 Msun tha…