Observational features of exoplanetary synchrotron radio bursts
arXiv:2004.12663 · doi:10.3847/1538-4357/ab881b
Abstract
Magnetic fields of exoplanets are important in shielding the planets from cosmic rays and interplanetary plasma. Due to the interaction with the electrons from their host stars, the exoplanetary magnetospheres are predicted to have both cyclotron and synchrotron radio emissions, of which neither has been definitely identified in observations yet. As the coherent cyclotron emission has been extensively studied in literatures, here we focus on the planetary synchrotron radiation with bursty behaviors (i.e., radio flares) caused by the outbreaks of energetic electron ejections from the host star. Two key parameters of the bursty synchrotron emissions, namely the flux density and burst rate, and two key features namely the burst light curve and frequency shift, are predicted for star - hot Jupiter systems. The planetary orbital phase - burst rate relation is also considered as the signature of star-planet interactions (SPI). As examples, previous X-ray and radio observations of two well studied candidate systems, HD 189733 and V830 τ, are adopted to predict their specific burst rates and fluxes of bursty synchrotron emissions for further observational confirmations. The detectability of such emissions by current and upcoming radio telescopes shows that we are at the dawn of discoveries.
Accepted for publication in ApJ, 3 figures
References in corpus (12)
- A planetesimal orbiting within the debris disc around a white dwarf star
- Magnetic field strengths of hot Jupiters from signals of star-planet interactions
- The corona of HD 189733 and its X-ray activity
- A statistical analysis of X-ray variability in pre-main sequence objects of the Taurus Molecular Cloud
- The hot Jupiter of the magnetically-active weak-line T Tauri star V830 Tau
- FUV variability of HD 189733. Is the star accreting material from its hot Jupiter?
- Planning the scientific applications of the Five-hundred-meter Aperture Spherical radio Telescope
- The Rise of ROME. I. A Multiwavelength Analysis of the Star-Planet Interaction in the HD 189733 System
- Variable Radio Emission from the Young Stellar Host of a Hot Jupiter
- Detecting exoplanets with FAST?
- Probing Jovian Decametric Emission with the Long Wavelength Array Station 1
- Non-thermal emission from the interaction of magnetized exoplanets with the wind of their host star