SIMBAD references

2018MNRAS.475L..25V - Mon. Not. R. Astron. Soc., 475, L25-L29 (2018)

Prominence formation and ejection in cool stars.

VILLARREAL D'ANGELO C., JARDINE M. and SEE V.

Abstract (from CDS):

The observational signatures of prominences have been detected in single and binary G and K type stars for many years now, but recently this has been extended to the M dwarf regime. Prominences carry away both mass and angular momentum when they are ejected and the impact of this mass on any orbiting planets may be important for the evolution of exoplanetary atmospheres. By means of the classification used in the massive star community, that involves knowledge of two parameters (the co-rotation and Alfven radii, rK and rA), we have determined which cool stars could support prominences. From a model of mechanical support, we have determined that the prominence mass mp/M* = (EM/EG)(r*/rK)2F where EMB*2r*^3 and EG=GM*2/r_*are magnetic and gravitational energies and F is a geometric factor. Our calculated masses and ejection frequencies (typically 1016 - 1017 g and 0.4 d, respectively) are consistent with observations and are sufficient to ensure that an exoplanet orbiting in the habitable zone of an M dwarf could suffer frequent impacts.

Abstract Copyright: © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: coronae - stars: low-mass - stars: magnetic field

Simbad objects: 48

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2019.09.20-12:40:25

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