Low-frequency radio observations open new avenues for studying planetary magnetospheres, star-planet interactions, and the unintended impact of satellite constellations. In this seminar, I will discuss our search for exoplanetary radio emissions, particularly from the HD 189733 system. Our observations revealed a 1.5 Jy circularly polarized burst, and while its origin remains uncertain, our theoretical analysis suggests it is likely to be associated with the exoplanet system. We will explore possible emission mechanisms, including magnetospheric processes and star-planet interactions. In parallel, I will highlight our detection of broadband emissions from multiple Starlink satellites in the 30-78 MHz range, with intensities exceeding 500 Jy. Our findings indicate that these emissions are intrinsic to the satellites, raising concerns about their growing impact on low-frequency radio astronomy. Together, these results provide new insights into both natural and artificial radio emissions, shaping the future of observational strategies in the field.
Zoom link : https://cnrs.zoom.us/j/95003883304?pwd=MI0B5WLYiGZlzo3oAZUl5TAu4fta6q.1
