The Low Frequency Array (LOFAR) was designed to study a largely unexplored low-frequency radio window. A new generation of imaging algorithms developed at Observatoire de Paris has allowed LOFAR to reach its highest sensitivity, ultimately enabling the LOFAR Two-metre Sky Survey (LoTSS), the largest and most sensitive survey to date, detecting millions of star-forming galaxies and accreting black holes. We extended these capabilities with a new technique called Radio Interferometric Multiplexed Spectroscopy (RIMS), which aims to detect transient radio emission from stellar and exoplanetary systems, potentially hidden in the petabytes of LoTSS interferometric data. Over an 8-year period, RIMS silently stored 500,000 dynamic spectra and enabled unexpected discoveries, including a first extrasolar coronal mass ejection (type II burst), as well as radio emissions likely due to auroral processes driven by star-planet interactions. New detections are being obtained in the second half of the LOFAR sky survey at 150 MHz, as well as with NenuFAR at 50 MHz. RIMS will be applied to LOFAR 2.0 and potentially the Square Kilometre Array, enabling many new detections and opening the study of exoplanetary radio emission and extrasolar space weather. Ongoing work aims to extend this approach to a worldwide, open-science, decentralised monitoring network.
The detection of rare stellar and exoplanetary radio emission in the largest low-frequency sky survey
Lundi 4 mai 2026
de
11:00 à
12:00
Amphithéâtre bâtiment 18 Evry Schatzman, Meudon
