High spatial resolution optical imaging of the multiple T Tauri system LkH¿ 262/LkH¿ 263

  • S. Velasco /
  • R. Rebolo /
  • A. Oscoz /
  • C. Mackay /
  • L. Labadie /
  • A. Pérez Garrido /
  • J. Crass /
  • A. Díaz-Sánchez /
  • B. Femenía /
  • V. González-Escalera /
  • D. L. King /
  • R. L. López /
  • M. Puga /
  • L. F. Rodríguez-Ramos /
  • J. Zuther
Journal ar
Monthly Notices of the Royal Astronomical Society
  • Volumen: 460
  • Número: 4
  • Fecha: 21 August 2016
  • Páginas: 3519-3528
  • ISSN: 13652966 00358711
  • Source Type: Journal
  • DOI: 10.1093/mnras/stw1071
  • Document Type: Article
  • Publisher: Oxford University
© 2016 The Authors.We report high spatial resolution i' band imaging of the multiple T Tauri system LkH¿ 262/LkH¿ 263 obtained during the first commissioning period of the Adaptive Optics Lucky Imager (AOLI) at the 4.2-m William Herschel Telescope, using its Lucky Imaging mode. AOLI images have provided photometry for each of the two components LkH¿ 263 A and B (0.41 arcsec separation) and marginal evidence for an unresolved binary or a disc in LkH¿ 262. The AOLI data combined with previously available and newly obtained optical and infrared imaging show that the three components of LkH¿ 263 are comoving, that there is orbital motion in the AB pair, and, remarkably, that LkH¿ 262-263 is a common proper motion system with less than 1 mas yr-1 relative motion. We argue that this is a likely five-component gravitationally bounded system. According to BT-settl models the mass of each of the five components is close to 0.4 M· and the age is in the range 1-2 Myr. The presence of discs in some of the components offers an interesting opportunity to investigate the formation and evolution of discs in the early stages of multiple very low mass systems. In particular, we provide tentative evidence that the disc in 263C could be coplanar with the orbit of 263AB.

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