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We present new radio/millimeter measurements of the hot magnetic star HR5907obtained with the VLA and ALMA interferometers. We find that HR5907 is the mostradio luminous early type star in the cm-mm band among those presently known.Its multi-wavelength radio light curves are strongly variable with an amplitudethat increases with radio frequency. The radio emission can be explained by thepopulations of the non-thermal electrons accelerated in the current sheets onthe outer border of the magnetosphere of this fast rotating magnetic star. Weclassify HR5907 as another member of the growing class of strongly magneticfast rotating hot stars where the gyro-synchrotron emission mechanismefficiently operates in their magnetospheres. The new radio observations ofHR5907 are combined with archival X-ray data to study the physical condition ofits magnetosphere. The X-ray spectra of HR5907 show tentative evidence for thepresence of non-thermal spectral component. We suggest that non-thermal X-raysoriginate a stellar X-ray aurora due to streams of non-thermal electronsimpacting on the stellar surface. Taking advantage of the relation between thespectral indices of the X-ray power-law spectrum and the non-thermal electronenergy distributions, we perform 3-D modeling of the radio emission for HR5907.The wavelength-dependent radio light-curves probe magnetospheric layers atdifferent heights above the stellar surface. A detailed comparison betweensimulated and observed radio light-curves leads us to conclude that the stellarmagnetic field of HR5907 is likely non-dipolar, providing further indirectevidence of the complex magnetic field topology of HR5907.

A combined multiwavelength VLA/ALMA/Chandra study unveils the complex magnetosphere of the B-type star HR5907