NenuFAR beamformed Stokes-V data tentatively show a ~10σ left-hand circularly polarized burst from HD 189733 at 27–40 MHz lasting ~16 min, offset by ~1 h from the imaging burst of Zhang et al. (2025).
Stellar activity and magnetic shielding
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
Stellar activity has a particularly strong influence on planets at small orbital distances, such as close-in exoplanets. For such planets, we present two extreme cases of stellar variability, namely stellar coronal mass ejections and stellar wind, which both result in the planetary environment being variable on a timescale of billions of years. For both cases, direct interaction of the streaming plasma with the planetary atmosphere would entail servere consequences. In certain cases, however, the planetary atmosphere can be effectively shielded by a strong planetary magnetic field. The efficiency of this shielding is determined by the planetary magnetic dipole moment, which is difficult to constrain by either models or observations. We present different factors which influence the strength of the planetary magnetic dipole moment. Implications are discussed, including nonthermal atmospheric loss, atmospheric biomarkers, and planetary habitability.
fields
astro-ph.EP 1years
2026 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
-
Tentative detection of circularly polarized bursty radio emissions from the HD 189733 exoplanetary system using NenuFAR beamformed observations
NenuFAR beamformed Stokes-V data tentatively show a ~10σ left-hand circularly polarized burst from HD 189733 at 27–40 MHz lasting ~16 min, offset by ~1 h from the imaging burst of Zhang et al. (2025).