Tootfinder

Role of non-thermal processes in the quiescent and active millimeter spectrum of a young M-dwarf
Atul Mohan, Peter H. Hauschildt, Birgit Fuhrmeister, Surajit Mondal, Vladimir Airapetian, Sven Wedemeyer
https://arxiv.org/abs/2506.19779

Role of non-thermal processes in the quiescent and active millimeter spectrum of a young M-dwarf
Millimeter (mm) emission from F - M dwarfs (cool stars) primarily traces chromospheric activity, with thermal emission thought to dominate in quiescence. Despite the high chromospheric activity, the quiescent mm spectral fluence (mm-S($ν$)) of young (< 1 Gyr) M dwarfs (dMs) remain largely unexplored. We present the quiescent mm-S($ν$) of a young dM, ADLeo, observed around 94 GHz using the Northern Extended Millimetre Array (NOEMA). The observed quiescent mm-S($ν$) exceeds the thermal flux de…