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).
The circumstellar environment of 55 Cnc: The super-Earth 55 Cnc e as a primary target for star-planet interactions
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abstract
Context. 55 Cancri hosts five known exoplanets, most notably the hot super-Earth 55 Cnc e, which is one of the hottest known transiting super-Earths. Aims. Due to the short orbital separation and host star brightness, 55 Cnc e provides one of the best opportunities for studying star-planet interactions (SPIs). We aim to understand possible SPIs in this system, which requires a detailed understanding of the stellar magnetic field and wind impinging on the planet. Methods. Using spectropolarimetric observations, and Zeeman Doppler Imaging, we derive a map of the large-scale stellar magnetic field. We then simulate the stellar wind starting from the magnetic field map, using a 3D MHD model. Results. The map of the large-scale stellar magnetic field we derive has an average strength of 3.4 G. The field has a mostly dipolar geometry, with the dipole tilted by 90 degrees with respect to the rotation axis, and dipolar strength of 5.8 G at the magnetic pole. The wind simulations based on this magnetic geometry lead us to conclude that 55 Cnc e orbits inside the Alfv\'en surface of the stellar wind, implying that effects from the planet on the wind can propagate back to the stellar surface and result in SPI.
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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).