Stellar Systems at Low Radio Frequencies: The Discovery of Radio Exoplanets

Joseph Callingham, Harish Vedantham, Tim Shimwell, Benjamin J. S. Pope, Megan Bedell

Research output: Contribution to journalMeeting AbstractAcademic

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Abstract

For more than thirty years, radio astronomers have searched for auroral emission from exoplanets. With LOFAR we have recently detected strong, highly circularly polarised low-frequency (144 MHz) radio emission associated with a M-dwarf — the expected signpost of such radiation. The star itself is quiescent, with a 130-day rotation period and low X-ray luminosity. In this talk, I will detail how the radio properties of the detection imply that such emission is generated by the presence of an exoplanet in a short period orbit around the star, and our follow-up radial-velocity (RV) observations with Harps-N to confirm the exoplanet's presence. Our study highlights the powerful new and developing synergy between low-frequency radio astronomy and RV observations, with radio emission providing a strong prior on the presence of a short-period planet. I will conclude the talk detailing how the radio detection of an star-exoplanet interaction provides unique information for exoplanet climate and habitability studies, and the extension of our survey to other stellar systems.

Original languageEnglish
Pages (from-to)201.02
JournalBulletin of the American Astronomical Society
Volume51
Issue number6
Publication statusPublished - 1-Aug-2019
EventAASTCS 7: Extreme Solar Systems IV meeting was held 19-23 August 2019 in Reykjavik, Iceland - Reykjavik, Iceland
Duration: 19-Aug-201923-Aug-2019

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