Exoplanets, -moons, -comets

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

By Keith Cowing
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astro-ph.EP
February 13, 2025
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The Magnetically Induced Radial Velocity Variation of Gliese 341 and an Upper Limit to the Mass of Its Transiting Earth-sized Planet
GP model fit to the RV data. Left panel shows the entire RV time series in black and the GP model in blue, with residuals plotted in the lower panel, to demonstrate that a quasiperiodic GP model was able to capture the long-period variation caused by the stellar magnetic cycle. The gray shaded region is shown in the right panel. The right panel shows the same model and data over a centrally located 60 day baseline, to highlight the effects of the 9.42 day stellar rotation period. — astro-ph.EP

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.

Victoria DiTomasso, Mercedes Lopez-Morales, Sarah Peacock, Luca Malavolta, James Kirk, Kevin B. Stevenson, Guangwei Fu, Jacob Lustig-Yaeger

Comments: 18 pages, 17 figures
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2502.07867 [astro-ph.EP] (or arXiv:2502.07867v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2502.07867
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Journal reference: The Astrophysical Journal, Volume 979, Issue 2, id.214, 18 pp. February 2025
Related DOI:
https://doi.org/10.3847/1538-4357/ad9dd3
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Submission history
From: Victoria DiTomasso
[v1] Tue, 11 Feb 2025 18:53:37 UTC (2,245 KB)
https://arxiv.org/abs/2502.07867
Astrobiology,

Keith Cowing

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻

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