STELLAR Seminar - Dr. Harish Vedantham, ASTRON, The Netherlands скачать в хорошем качестве

STELLAR Seminar - Dr. Harish Vedantham, ASTRON, The Netherlands

“Radio flashes from plasma storms around exoplanets” Dr. Harish Vedantham ASTRON, The Netherlands Institute of Radio Astronomy Abstract: Low frequency (less than few hundred MHz) radio observations uniquely trace several processes that determine the habitability of exoplanets. Coronal plasma ejections that erode planetary atmospheres can be detected using the characteristic radio bursts they emit. Planetary magnetic fields that largely determine the planetary defence against the stellar onslaught can also be detected using radio observations. Radio observations of such phenomena in the solar system are commonplace. I will argue that the extrasolar frontier is now also within reach thanks to powerful new low-frequency telescopes such as LOFAR. I will describe an observational program using LOFAR to systematically survey the low-frequency radio sky for stellar, brown dwarf and exoplanetary emission with unprecedented sensitivities reaching a fraction of a milliJansky at 150 MHz and below. I will present some early successes of this campaign including (a) the discovery of evidence for magnetic interaction between a star and its planet and (b) the discovery of a cold brown dwarf directly in the radio band using its magnetospheric emissions. I will end with an outlook for harnessing radio astronomy’s unique diagnostic capabilities to advance exoplanet science. The STELLAR project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 952439. Learn more at https://www.stellar-h2020.eu