Please note this event has been cancelled. 

Title: "The Search for Radio Emission from Exoplanets Using LOFAR Low-Frequency Beamformed Observations"

Abstract: The detection of radio emissions from exoplanets will open up a vibrant new research field. Observing planetary auroral radio emission is the most promising method to detect exoplanetary magnetic fields, the knowledge of which will provide valuable insights into the planet's interior structure, atmospheric escape, and habitability. To date, many ground-based observations conducted to find exoplanet radio emission have resulted in non-detections. Here, I will present on the first possible detection of an exoplanet in the radio (Turner et al. 2021). In this study, we detected slowly variable emission (> 8 sigma) and bursty emission (~3.2 sigma) from the exoplanetary system Tau Bootis using low-frequency beamformed observations from LOFAR (Low Frequency Array). We will discuss in detail all the arguments for and against an actual detection. Assuming the detected signals are real, we discuss their potential origin. Their source probably is the Tau Bootis planetary system, and a possible explanation is radio emission from the exoplanet Tau Bootis b via the cyclotron maser mechanism. Assuming a planetary origin, we derived limits for the planetary polar surface magnetic field strength, finding values compatible with theoretical predictions. If this detection is confirmed it will place important constraints on the dynamo theory. Follow-up observations are ongoing with LOFAR and other low-frequency telescopes to confirm this possible first detection of an exoplanetary radio signal. We will also briefly discuss the first results from these follow-up observations.

Host: Jessica Libby-Roberts

Seminar held in 538 Davey or please email CEHW-SEMINAR-QUESTIONS@lists.psu.edu to attend virtually.