Astronomy and Astrophysics, volume 463, issue 3, pages 1017-1028
Magnetospheric accretion-ejection processes in the classical T Tauri star AA Tauri
Bouvier J.
1
,
Alencar Silvia H. P.
1, 2
,
Boutelier T.
1
,
Dougados C.
1
,
Balog Z.
3, 4
,
Grankin K. N.
5
,
Hodgkin S. T.
6
,
Ibrahimov M. A.
5
,
Kun Mária
7
,
Magakian T. Yu.
8
,
2
Departamento de Física, ICEx-UFMG, CP. 702, Belo Horizonte, MG, 30123-970, Brazil
|
3
university of Arizona
|
4
University of Szeged
|
6
Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK.
|
7
Konkoly Observatory, 1525 Budapest PO Box 67, Hungary
|
Publication type: Journal Article
Publication date: 2006-12-05
Journal:
Astronomy and Astrophysics
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 6.5
ISSN: 00046361, 14320746, 23291273, 23291265
Space and Planetary Science
Astronomy and Astrophysics
Abstract
Context. Accretion and ejection are complex and related processes that vary on various timescales in young stars. Aims. We intend to investigate the accretion and outflow dynamics and their interaction from observations of the classical T Tauri star AA Tau. Methods. From a long time series of high resolution (R = 115 000) HARPS spectra and simultaneous broad-band photometry, we report new evidence for magnetospheric accretion as well as ejection processes in the nearly edge-on classical T Tauri star AA Tau. Results. AA Tau’s light curve is modulated with a period of 8.22 d. The recurrent luminosity dips are due to the periodic occultation of the central star by the magnetically-warped inner disk edge located at about 9 R� . Balmer line profiles exhibit a clear rotational modulation of high-velocity redshifted absorption components with a period of 8.22 days as well, with a maximum strength when the main accretion funnel flow passes through the line of sight. At the same time, the luminosity of the system decreases by about 1 mag, indicative of circumstellar absorption of the stellar photosphere by the magnetically-warped, corotating inner disk edge. The photospheric and He I radial velocities also exhibit periodic variations, and the veiling is modulated by the appearance of the accretion shock at the bottom of the accretion funnel. Diagnostics of hot winds and their temporal behaviour are also presented. Conclusions. The peculiar geometry of the young AA Tau system (nearly edge-on) allows us to uniquely probe the acretion-ejection region close to the star. We find that most spectral and photometric diagnostics vary as expected from models of magneticallychannelled accretion in young stars, with a large scale magnetosphere tilted by 20 ◦ onto the star’s spin axis. We also find evidence for time variability of the magnetospheric accretion flow on a timescale of a few rotational periods.
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Bouvier J. et al. Magnetospheric accretion-ejection processes in the classical T Tauri star AA Tauri // Astronomy and Astrophysics. 2006. Vol. 463. No. 3. pp. 1017-1028.
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Bouvier J., Alencar S. H. P., Boutelier T., Dougados C., Balog Z., Grankin K. N., Hodgkin S. T., Ibrahimov M. A., Kun M., Magakian T. Y., Pinte C. Magnetospheric accretion-ejection processes in the classical T Tauri star AA Tauri // Astronomy and Astrophysics. 2006. Vol. 463. No. 3. pp. 1017-1028.
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TY - JOUR
DO - 10.1051/0004-6361:20066021
UR - https://doi.org/10.1051%2F0004-6361%3A20066021
TI - Magnetospheric accretion-ejection processes in the classical T Tauri star AA Tauri
T2 - Astronomy and Astrophysics
AU - Boutelier, T.
AU - Hodgkin, S. T.
AU - Ibrahimov, M. A.
AU - Magakian, T. Yu.
AU - Bouvier, J.
AU - Alencar, Silvia H. P.
AU - Dougados, C.
AU - Balog, Z.
AU - Grankin, K. N.
AU - Kun, Mária
AU - Pinte, Christophe
PY - 2006
DA - 2006/12/05 00:00:00
PB - EDP Sciences
SP - 1017-1028
IS - 3
VL - 463
SN - 0004-6361
SN - 1432-0746
SN - 2329-1273
SN - 2329-1265
ER -
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@article{2006_Bouvier,
author = {T. Boutelier and S. T. Hodgkin and M. A. Ibrahimov and T. Yu. Magakian and J. Bouvier and Silvia H. P. Alencar and C. Dougados and Z. Balog and K. N. Grankin and Mária Kun and Christophe Pinte},
title = {Magnetospheric accretion-ejection processes in the classical T Tauri star AA Tauri},
journal = {Astronomy and Astrophysics},
year = {2006},
volume = {463},
publisher = {EDP Sciences},
month = {dec},
url = {https://doi.org/10.1051%2F0004-6361%3A20066021},
number = {3},
pages = {1017--1028},
doi = {10.1051/0004-6361:20066021}
}
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MLA
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Bouvier, J., et al. “Magnetospheric accretion-ejection processes in the classical T Tauri star AA Tauri.” Astronomy and Astrophysics, vol. 463, no. 3, Dec. 2006, pp. 1017-1028. https://doi.org/10.1051%2F0004-6361%3A20066021.
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