Variable Radio Emission from the Young Stellar Host of a Hot Jupiter

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 $\stackrel{>}{\sim }30$ 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.

arXiv commentApJ, in press

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• The search for radio emission from the exoplanetary systems 55 Cancri, $\upsilon$ Andromedae, and $\tau$ Boötis using LOFAR beam-formed observations
• How do stars gain their mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star Forming Regions
• The hot Jupiter of the magnetically-active weak-line T Tauri star V830 Tau
• Predicting radio emission from the newborn hot Jupiter V830 Tau and its host star
• SPIRou: a nIR spectropolarimeter / high-precision velocimeter for the CFHT
• Radio Stars: from kHz to THz
• Radio emission in ultracool dwarfs: the nearby substellar triple system VHS 1256$-$1257
• Non-thermal emission from the interaction of magnetized exoplanets with the wind of their host star
• The milliarcsecond-scale radio structure of AB Dor A
• Observational features of exoplanetary synchrotron radio bursts
• First detection of variable radio emission originating from the infant planetary system V1298 Tau
• Chandra X-ray Observations of V830 Tau: A T Tauri Star Hosting an Evanescent Planet