3D-modelling of the stellar auroral radio emission

Abstract

The electron cyclotron maser is the coherent emission process that gives rise to the radio lighthouse effect observed in the hot magnetic chemically peculiar star CU Virginis. It has also been proposed to explain the highly circularly polarized radio pulses observed on some ultra cool dwarfs, with spectral type earlier than M7. Such kind of coherent events resemble the auroral radio emission from the magnetized planets of the solar system. In this paper, we present a tridimensional model able to simulate the timing and profile of the pulses emitted by those stars characterized by a dipolar magnetic field by following the hypothesis of the laminar source model, used to explain the beaming of the terrestrial auroral kilometric radiation. This model proves to be a powerful tool to understand the auroral radio-emission phenomenon, allowing us to derive some general conclusions about the effects of the model's free parameters on the features of the coherent pulses, and to learn more about the detectability of such kind of pulsed radio emission.

arXiv comment11 pages, 8 figures; accepted for publication in MNRAS

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• The Strongest Magnetic Fields on the Coolest Brown Dwarfs
• A Panchromatic View of Brown Dwarf Aurorae
• Monitoring the radio emission of Proxima Centauri
• MOBSTER -- VI. The crucial influence of rotation on the radio magnetospheres of hot stars
• The detection of variable radio emission from the fast rotating magnetic hot B-star HR7355 and evidence for its X-ray aurorae
• Variable and polarized radio emission from the T6 brown dwarf WISEP J112254.73+255021.5
• Evidence for radio and X-ray auroral emissions from the magnetic B-type star rho Oph A
• Discovery of electron cyclotron MASER emission from the magnetic Bp star HD 133880 with the Giant Metrewave Radio Telescope
• A combined multiwavelength VLA/ALMA/Chandra study unveils the complex magnetosphere of the B-type star HR5907
• Evidence for a radiation belt around a brown dwarf
• Detection of Alpha Centauri at radio wavelengths: chromospheric emission and search for star-planet interaction
• The polarization mode of the auroral radio emission from the early-type star HD142301
• Radio Stars: from kHz to THz
• Simulating radio emission from Low Mass Stars
• Detection of coherent emission from the Bp star HD 142990 at uGMRT frequencies
• The fifth main sequence magnetic B-type star showing coherent radio emission: is this really a rare phenomenon?
• Radio masers on WX UMa: hints of a Neptune-sized planet, or magnetospheric reconnection?
• The auroral radio emission of the magnetic B-type star rho OphC
• HST/STIS analysis of the first main sequence pulsar CU Vir
• Unraveling the complex magnetosphere of the B star HD 133880 via wideband observation of coherent radio emission
• Probing the magnetosphere of the M8.5 dwarf TVLM513-46546 by modelling its auroral radio emission. Hint of star exoplanet interaction?
• Differences in radio emission from similar M dwarfs in the binary system Ross 867-8
• Discovery of Magnetospheric Interactions in the Doubly-Magnetic Hot Binary $\epsilon$ Lupi
• Transitions in magnetic behavior at the substellar boundary
• Electron Cyclotron Maser Emission as the Driving Mechanism in Long-Period Radio Transients
• Ultra-Wideband, Multi-epoch Radio Study of the First Discovered `Main sequence Radio Pulse emitter' CU Vir
• Discovery of eight 'Main-sequence Radio Pulse emitters' using the GMRT: clues to the onset of coherent radio emission in hot magnetic stars