Speaker
Description
The CARMENES high-resolution spectrograph located at the 3.5m Calar Alto telescope, which provides simultaneous coverage at 0.52-1.71 micrometers, is a powerful instrument for the study of nearby M-dwarf stars. It has been central to a monitoring campaign of more than 2200 such objects, complementing its excellent infrared coverage with information from other bands ranging from the optical to the X-rays, allowing for exquisite constraints on key physical parameters linked to either stellar activity or exoplanetary properties (e.g. rotation and orbital periods, masses, etc). In this work, we explore the properties of CARMENES objects in the radio bands at 144 MHz and 1.4 GHz with LoTSS-DR3 and VLASS, surveys which cover the full Northern sky, to explore the persistent radio emission of these objects. Such persistent emission may arise from either the stellar physics of M-dwarf (which are small and compact, with masses between 0.08 and 1 solar masses, and thus feature very strong and stable magnetic fields ranging from hundreds to thousands of Gauss), or trace the star-planet interactions predicted for exoplanetary systems with magnetospheres. This work complements the wider community's search for transient signals associated to star-planet emission by attempting to find correlations between known CARMENES properties and either burst or sustained radio emission from these objects at 21cm and low radio frequencies.
