Constraining the coronal properties of AB Dor in the radio regime

C E Brasseur*, M M Jardine, G A J Hussain

*Corresponding author for this work

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Abstract

We present a multiwavelength study of AB Doradus, combining modelling that incorporates a spectropolarimetric magnetic field map with 8.4 GHz radio interferometry to measure the coronal extent and density of this young star. We use the surface magnetic field map to produce a 3D extrapolation of AB Dor’s coronal magnetic field. From this model we create synthetic radio images throughout the stellar rotation period which we can compare with the interferometric radio observations. Our models reproduce the two-lobe structure seen in the radio observations. We successfully fit the observed flux magnitude and lobe separation with our model. We conclude that that the features seen in the radio images are a result of centrifugal containment of hot gas at the peak of closed magnetic loops, and that the corona of AB Dor extends to about 8–10 stellar radii, making it much more extended than the present-day solar corona.
Original languageEnglish
Pages (from-to)2442-2451
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume530
Issue number2
Early online date11 Apr 2024
DOIs
Publication statusPublished - May 2024

Keywords

  • Stars: coronae
  • Stars: individual: AB Doradus
  • Stars: low-mass
  • Stars: magnetic field

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