4.7 Article

The magnetic propeller accretion regime of LkCa 15

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出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/sly207

关键词

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

资金

  1. European Research Council (ERC) under the H2020 research & innovation programme [740651, 742095]
  2. CNPq
  3. CAPES
  4. Fapemig
  5. Programme National de Physique Stellaire (PNPS) of CNRS/INSU
  6. STFC [ST/J003255/1] Funding Source: UKRI

向作者/读者索取更多资源

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-circle dot 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.

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