DOI

https://doi.org/10.48717/5mh5-nf46

Project

EG123

Title

e-EVN: EA065J, EG123A, EC082F, EN011C

Abstract

The red dwarfs (RDs) are the most common stars in the Solar neighbourhood and probably in the Universe. Most (likely all) young RDs are magnetically active. Usually, due to the chromospheric activity, their radial velocities cannot be measured with the accuracy required for spectroscopic searches for low-mass companions. Hence, young RDs are frequently omitted in large RV M dwarf surveys (like CARMENES) as eruptive variables. Here we propose additional observations of our long-term astrometric survey of active, radio-emitting RDs at the C-band. With recent experience, radio interferometry seems to be ideally suited for detecting low-mass companions of young, active RDs. This proposal is a final continuation of our project RISARD. We aim to obtain four additional epochs for one star from our initial sample (Ross 15 - V596 Cas), as this M dwarf reveals large residuals from the astrometric model. Moreover, Gaia DR3 results also indicate a noticeable deviation from the simple astrometric model.