High spatial resolution optical imaging of the multiple T Tauri system LkH{\alpha} 262/LkH{\alpha} 263

• Published in: arXiv.org 2016-05
• Main Authors: Velasco, S, Rebolo, R, Oscoz, A, Mackay, C, Labadie, L, A Pérez Garrido, Crass, J, Díaz-Sánchez, A, Femenía, B, González-Escalera, V, King, D L, López, R L, Puga, M, Rodríguez-Ramos, L F, Zuther, J
• Format: Article
• Language: English
• Subjects: Adaptive optics; Infrared imaging; Motion systems; Photometry; Space telescopes; Spatial resolution
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1605.01431

We report high spatial resolution i' band imaging of the multiple T Tauri system LkH\(\alpha\) 262/LkH\(\alpha\) 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\(\alpha\) 263 A and B (0.41 arcsec separation) and marginal evidence for an unresolved binary or a disc in LkH\(\alpha\) 262. The AOLI data combined with previously available and newly obtained optical and infrared imaging show that the three components of LkH\(\alpha\) 263 are co-moving, that there is orbital motion in the AB pair, and, remarkably, that LkH\(\alpha\) 262-263 is a common proper motion system with less than 1 mas/yr 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\(_{\odot}\) 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.