Constraining the coronal properties of AB Dor in the radio regime

C E Brasseur; M M Jardine; G A J Hussain

doi:10.1093/mnras/stae996

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

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	2442-2451
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	530
Issue number	2
Early online date	11 Apr 2024
DOIs	https://doi.org/10.1093/mnras/stae996
Publication status	Published - May 2024

Keywords

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

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10.1093/mnras/stae996Licence: CC BY

Brasseur-2024-Constraining-the-coronal-MNRAS-530-2-2442-CCBY
Copyright © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Final published version, 2.89 MBLicence: CC BY

Astronomy at St Andrews 2018-2021: Astronomy at St Andrews 2018-2021
Jardine, M. M. (PI), Bonnell, I. A. (CoI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Dominik, M. (CoI), Helling, C. (CoI), Horne, K. D. (CoI), Scholz, A. (CoI), Tojeiro, R. (CoI), Weijmans, A.-M. (CoI), Wild, V. (CoI), Woitke, P. (CoI), Wood, K. (CoI) & Zhao, H. (CoI)
1/04/18 → 31/03/22
Project: Standard

Cite this

@article{eeeab6e4e8034a35bcbbff15a3874276,

title = "Constraining the coronal properties of AB Dor in the radio regime",

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{\textquoteright}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.",

keywords = "Stars: coronae, Stars: individual: AB Doradus, Stars: low-mass, Stars: magnetic field",

author = "Brasseur, {C E} and Jardine, {M M} and Hussain, {G A J}",

note = "Funding: MMJ acknowledges support from STFC consolidated grant number ST/R000824/1. CEB acknowledges funding from the St Andrews GH Chaplin scholarship.",

year = "2024",

month = may,

doi = "10.1093/mnras/stae996",

language = "English",

volume = "530",

pages = "2442--2451",

journal = "Monthly Notices of the Royal Astronomical Society",

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publisher = "Oxford University Press",

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T1 - Constraining the coronal properties of AB Dor in the radio regime

AU - Brasseur, C E

AU - Jardine, M M

AU - Hussain, G A J

N1 - Funding: MMJ acknowledges support from STFC consolidated grant number ST/R000824/1. CEB acknowledges funding from the St Andrews GH Chaplin scholarship.

PY - 2024/5

Y1 - 2024/5

N2 - 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.

AB - 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.

KW - Stars: coronae

KW - Stars: individual: AB Doradus

KW - Stars: low-mass

KW - Stars: magnetic field

U2 - 10.1093/mnras/stae996

DO - 10.1093/mnras/stae996

M3 - Article

SN - 0035-8711

VL - 530

SP - 2442

EP - 2451

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

Constraining the coronal properties of AB Dor in the radio regime

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Keywords

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Astronomy at St Andrews 2018-2021: Astronomy at St Andrews 2018-2021

Cite this