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Simulating radio emission from low-mass stars

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Llama_2018_AJ_radioemission_FinalPubVersion.pdf (1.121Mb)
Date
06/02/2018
Author
Llama, Joe
Jardine, Moira M.
Wood, Kenneth
Hallinan, Gregg
Morin, Julien
Funder
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/R00824/1
ST/M001296/1
Keywords
Stars: activity
Stars: individual (V374 Peg)
Stars: low-mass
Stars: magnetic field
QB Astronomy
QC Physics
NDAS
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Abstract
Understanding the origins of stellar radio emission can provide invaluable insight into the strength and geometry of stellar magnetic fields and the resultant space weather environment experienced by exoplanets. Here, we present the first model capable of predicting radio emission through the electron cyclotron maser instability using observed stellar magnetic maps of low-mass stars. We determine the structure of the coronal magnetic field and plasma using spectropolarimetric observations of the surface magnetic fields and the X-ray emission measure. We then model the emission of photons from the locations within the corona that satisfy the conditions for electron cyclotron maser emission. Our model predicts the frequency and intensity of radio photons from within the stellar corona. We have benchmarked our model against the low-mass star V374 Peg. This star has both radio observations from the Very Large Array and a nearly simultaneous magnetic map. Using our model we are able to fit the radio observations of V374 Peg, providing additional evidence that the radio emission observed from low-mass stars may originate from the electron cyclotron maser instability. Our model can now be extended to all stars with observed magnetic maps to predict the expected frequency and variability of stellar radio emission in an effort to understand and guide future radio observations of low-mass stars.
Citation
Llama , J , Jardine , M M , Wood , K , Hallinan , G & Morin , J 2018 , ' Simulating radio emission from low-mass stars ' , Astrophysical Journal , vol. 854 , no. 1 , 7 . https://doi.org/10.3847/1538-4357/aaa59f
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.3847/1538-4357/aaa59f
ISSN
0004-637X
Type
Journal article
Rights
© 2018. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://doi.org/10.3847/1538-4357/aaa59f
Description
M.M.J. acknowledges support from STFC grant ST/M001296/1.
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  • University of St Andrews Research
URL
https://arxiv.org/abs/1801.01507
URI
http://hdl.handle.net/10023/12785

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