Flat Spectrum Radio Continuum Emission Associated with $\epsilon$ Eridani
Abstract
We present Very Large Array observations at 33.0 GHz that detect emission coincident with Eridani to within (0.2 AU at the distance of this star), with a positional accuracy of . This result strongly supports the suggestion of previous authors that the quiescent centimeter emission comes from the star and not from a proposed giant exoplanet with a semi-major axis of (3.4 AU). The centimeter emission is remarkably flat and is consistent with optically thin free-free emission. In particular, it can be modeled as a stellar wind with a mass loss rate of the order of , which is 3,300 times the solar value, exceeding other estimates of this star's wind. However, interpretation of the emission in terms of other thermal mechanisms like coronal free-free and gyroresonance emission cannot be discarded.
Keywords
Cite
@article{arxiv.1901.00903,
title = {Flat Spectrum Radio Continuum Emission Associated with $\epsilon$ Eridani},
author = {Luis F. Rodriguez and Susana Lizano and Laurent Loinard and Miguel Chávez-Dagostino and Timothy S. Bastian and Anthony J. Beasley},
journal= {arXiv preprint arXiv:1901.00903},
year = {2019}
}
Comments
13 pages, 3 figures