The magnetic propeller accretion regime of LkCa 15

J. -F. Donati, J. Bouvier, S. H. Alencar, C. Hill, Andrès Carmona, C. P. Folsom, F. Ménard, S. G. Gregory, G. A. Hussain, K. Grankin, C. Moutou, L. Malo, M. Takami, G. J. Herczeg

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present a spectropolarimetric study of the classical T Tauri star (cTTS) LkCa 15 investigating the large-scale magnetic topology of the central star and the way the field connects to the inner regions of the accretion disc. We find that the star hosts a strong poloidal field with a mainly axisymmetric dipole component of 1.35 kG, whereas the mass accretion rate at the surface of the star is 10-9.2 M yr-1. It implies that the magnetic field of LkCa 15 is able to evacuate the central regions of the disc up to a distance of 0.07 au at which the Keplerian orbital period equals the stellar rotation period. Our results suggest that LkCa 15, like the lower mass cTTS AA Tau, interacts with its disc in a propeller mode, a regime supposedly very efficient at slowing down the rotation of cTTSs hosting strong dipolar fields....
Original languageEnglish
Pages (from-to)L1-L5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume483
Issue number1
DOIs
Publication statusPublished - 11 Feb 2019

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propellers
T Tauri stars
accretion
stars
topology
stellar rotation
magnetic field
accretion disks
dipoles
orbitals
magnetic fields
rate

Keywords

  • stars: formation
  • stars: imaging
  • stars: individual: LkCa 15
  • stars: magnetic fields
  • techniques: polarimetric

Cite this

Donati, J. -F., Bouvier, J., Alencar, S. H., Hill, C., Carmona, A., Folsom, C. P., ... Herczeg, G. J. (2019). The magnetic propeller accretion regime of LkCa 15. Monthly Notices of the Royal Astronomical Society: Letters, 483(1), L1-L5. https://doi.org/10.1093/mnrasl/sly207
Donati, J. -F. ; Bouvier, J. ; Alencar, S. H. ; Hill, C. ; Carmona, Andrès ; Folsom, C. P. ; Ménard, F. ; Gregory, S. G. ; Hussain, G. A. ; Grankin, K. ; Moutou, C. ; Malo, L. ; Takami, M. ; Herczeg, G. J. / The magnetic propeller accretion regime of LkCa 15. In: Monthly Notices of the Royal Astronomical Society: Letters. 2019 ; Vol. 483, No. 1. pp. L1-L5.
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Donati, J-F, Bouvier, J, Alencar, SH, Hill, C, Carmona, A, Folsom, CP, Ménard, F, Gregory, SG, Hussain, GA, Grankin, K, Moutou, C, Malo, L, Takami, M & Herczeg, GJ 2019, 'The magnetic propeller accretion regime of LkCa 15', Monthly Notices of the Royal Astronomical Society: Letters, vol. 483, no. 1, pp. L1-L5. https://doi.org/10.1093/mnrasl/sly207

The magnetic propeller accretion regime of LkCa 15. / Donati, J. -F.; Bouvier, J.; Alencar, S. H.; Hill, C.; Carmona, Andrès; Folsom, C. P.; Ménard, F.; Gregory, S. G.; Hussain, G. A.; Grankin, K.; Moutou, C.; Malo, L.; Takami, M.; Herczeg, G. J.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 483, No. 1, 11.02.2019, p. L1-L5.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The magnetic propeller accretion regime of LkCa 15

AU - Donati, J. -F.

AU - Bouvier, J.

AU - Alencar, S. H.

AU - Hill, C.

AU - Carmona, Andrès

AU - Folsom, C. P.

AU - Ménard, F.

AU - Gregory, S. G.

AU - Hussain, G. A.

AU - Grankin, K.

AU - Moutou, C.

AU - Malo, L.

AU - Takami, M.

AU - Herczeg, G. J.

PY - 2019/2/11

Y1 - 2019/2/11

N2 - We present a spectropolarimetric study of the classical T Tauri star (cTTS) LkCa 15 investigating the large-scale magnetic topology of the central star and the way the field connects to the inner regions of the accretion disc. We find that the star hosts a strong poloidal field with a mainly axisymmetric dipole component of 1.35 kG, whereas the mass accretion rate at the surface of the star is 10-9.2 M☉ yr-1. It implies that the magnetic field of LkCa 15 is able to evacuate the central regions of the disc up to a distance of 0.07 au at which the Keplerian orbital period equals the stellar rotation period. Our results suggest that LkCa 15, like the lower mass cTTS AA Tau, interacts with its disc in a propeller mode, a regime supposedly very efficient at slowing down the rotation of cTTSs hosting strong dipolar fields....

AB - We present a spectropolarimetric study of the classical T Tauri star (cTTS) LkCa 15 investigating the large-scale magnetic topology of the central star and the way the field connects to the inner regions of the accretion disc. We find that the star hosts a strong poloidal field with a mainly axisymmetric dipole component of 1.35 kG, whereas the mass accretion rate at the surface of the star is 10-9.2 M☉ yr-1. It implies that the magnetic field of LkCa 15 is able to evacuate the central regions of the disc up to a distance of 0.07 au at which the Keplerian orbital period equals the stellar rotation period. Our results suggest that LkCa 15, like the lower mass cTTS AA Tau, interacts with its disc in a propeller mode, a regime supposedly very efficient at slowing down the rotation of cTTSs hosting strong dipolar fields....

KW - stars: formation

KW - stars: imaging

KW - stars: individual: LkCa 15

KW - stars: magnetic fields

KW - techniques: polarimetric

UR - https://ui.adsabs.harvard.edu/abs/2019MNRAS.483L...1D/abstract

UR - http://www.scopus.com/inward/record.url?scp=85062430631&partnerID=8YFLogxK

U2 - 10.1093/mnrasl/sly207

DO - 10.1093/mnrasl/sly207

M3 - Article

VL - 483

SP - L1-L5

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 1

ER -

Donati J-F, Bouvier J, Alencar SH, Hill C, Carmona A, Folsom CP et al. The magnetic propeller accretion regime of LkCa 15. Monthly Notices of the Royal Astronomical Society: Letters. 2019 Feb 11;483(1):L1-L5. https://doi.org/10.1093/mnrasl/sly207