Origin of radio-quiet coronal mass ejections in flare stars

Abstract

Type II radio bursts are observed in the Sun in association with many coronal mass ejections (CME's. In view of this association, there has been an expectation that, by scaling from solar flares to the flares which are observed on M dwarfs, radio emission analogous to solar Type II bursts should be detectable in association with M dwarf flares. However, several surveys have revealed that this expectation does not seem to be fulfilled. Here we hypothesize that the presence of larger global field strengths in low-mass stars, suggested by recent magneto-convective modeling, gives rise to such large Alfven speeds in the corona that it becomes difficult to satisfy the conditions for the generation of Type II radio bursts. As a result, CME's propagating in the corona/wind of a flare stars are expected to be "radio-quiet" as regards Type II bursts. In view of this, we suggest that, in the context of Type II bursts, scaling from solar to stellar flares is of limited effectiveness.

arXiv comment22 pages, 3 figures, Accepted for publication in the Astrophysical Journal

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• Modeling a Carrington-scale Stellar Superflare and Coronal Mass Ejection from ${\kappa }^{1}Cet$
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• A Self-Consistent Model for Dust-Gas Coupling in Protoplanetary Disks
• MEGARA-GTC Stellar Spectral Library (I)
• Searching for stellar flares from low mass stars using ASKAP and TESS
• MEGARA-GTC Stellar Spectral Library (II). MEGASTAR First Release
• MEGASTAR (III). Stellar parameters and data products for DR1 late-type stars
• Coronal Mass Ejections and Exoplanets: A Numerical Perspective