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Context. 55 Cancri hosts five known exoplanets, most notably the hotsuper-Earth 55 Cnc e, which is one of the hottest known transitingsuper-Earths. Aims. Due to the short orbital separation and host starbrightness, 55 Cnc e provides one of the best opportunities for studyingstar-planet interactions (SPIs). We aim to understand possible SPIs in thissystem, which requires a detailed understanding of the stellar magnetic fieldand wind impinging on the planet. Methods. Using spectropolarimetricobservations, and Zeeman Doppler Imaging, we derive a map of the large-scalestellar magnetic field. We then simulate the stellar wind starting from themagnetic field map, using a 3D MHD model. Results. The map of the large-scalestellar magnetic field we derive has an average strength of 3.4 G. The fieldhas a mostly dipolar geometry, with the dipole tilted by 90 degrees withrespect to the rotation axis, and dipolar strength of 5.8 G at the magneticpole. The wind simulations based on this magnetic geometry lead us to concludethat 55 Cnc e orbits inside the Alfv\'en surface of the stellar wind, implyingthat effects from the planet on the wind can propagate back to the stellarsurface and result in SPI.

The circumstellar environment of 55 Cnc: The super-Earth 55 Cnc e as a primary target for star-planet interactions