The Magnetically Induced Radial Velocity Variation of Gliese 341 and an Upper Limit to the Mass of Its Transiting Earth-sized Planet

TL;DR

This study refines the properties of the GJ 341 system, constrains the mass of its transiting Earth-sized planet using radial velocity data, and rules out additional companions, aiding future atmospheric observations.

Contribution

It provides improved stellar and planetary parameters, upper mass limits for GJ 341 b, and rules out other potential companions using comprehensive data analysis.

Findings

Planet GJ 341 b has an upper mass limit of 4.0 Earth masses (3 sigma).

No additional companions with M sin i > 15.1 Earth masses and P < 1750 days detected.

Confirmed the planetary nature of GJ 341 b and refined its parameters.

Abstract

The Transiting Exoplanet Survey Satellite (TESS) mission identified a potential 0.88 REarth planet with a period of 7.577 days, orbiting the nearby M1V star GJ 341 (TOI 741.01). This system has already been observed by the James Webb Space Telescope (JWST) to search for presence of an atmosphere on this planet. Here, we present an in-depth analysis of the GJ 341 system using all available public data. We provide improved parameters for the host star, an updated value of the planet radius, and support the planetary nature of the object (now GJ 341 b). We use 57 HARPS radial velocities to model the magnetic cycle and activity of the host star, and constrain the mass of GJ 341 b to upper limits of 4.0 MEarth (3 sigma) and 2.9 MEarth (1 sigma). We also rule out the presence of additional companions with M sin i > 15.1 MEarth, and P < 1750 days, and the presence of contaminating background objects during the TESS and JWST observations. These results provide key information to aid the interpretation of the recent JWST atmospheric observations and other future observations of this planet.