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).
Variable Radio Emission from the Young Stellar Host of a Hot Jupiter
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abstract
We report the discovery of variable radio emission associated with the T Tauri star, V830 Tau, which was recently shown to host a hot Jupiter companion. Very Large Array observations at a frequency of 6 GHz reveal a detection on 01 May 2011 with a flux density $919 \pm 26\ \mu$Jy, along with non-detections in two other epochs at $<66$ and $<150\ \mu$Jy. Additionally, Very Long Baseline Array observations include one detection and one non-detection at comparable sensitivity, demonstrating that the emission is nonthermal in origin. The emission is consistent with the gyro-synchrotron or synchrotron mechanism from a region with a magnetic field ${\stackrel{\scriptstyle >}{\scriptstyle \sim}} 30$ G, and is likely driven by an energetic event such as magnetic reconnection that accelerated electrons. With the limited data we have, we are not able to place any constraint on the relationship between the radio emission and the rotational or orbital properties of V830 Tau. This is the first detection of radio emission from a non-degenerate star known to host an exoplanet.
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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).