Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I

Author(s)

S. Daemgen, M. G. Petr-Gotzens, S. Correia, P. S. Teixeira, W. Brandner, W. Kley, H. Zinnecker

Abstract

Aims: This study aims to determine the impact of stellar binary

companions on the lifetime and evolution of circumstellar disks in the

Chamaeleon I (Cha I) star-forming region by measuring the frequency and

strength of accretion and circumstellar dust signatures around the

individual components of T Tauri binary stars. Methods: We used

high-angular resolution adaptive optics JHKsL' -band

photometry and 1.5-2.5 μm spectroscopy of 19 visual binary and 7

triple stars in Cha I - including one newly discovered tertiary

component - with separations between ~25 and ~1000 AU. The data allowed

us to infer stellar component masses and ages and, from the detection of

near-infrared excess emission and the strength of Brackett-γ

emission, the presence of ongoing accretion and hot circumstellar dust

of the individual stellar components of each binary. Results: Of

all the stellar components in close binaries with separations of 25-100

AU, 10+15-5% show signs of accretion. This is less

than half of the accretor fraction found in wider binaries, which itself

appears significantly reduced (~44%) compared with previous measurements

of single stars in Cha I. Hot dust was found around

50+30-15% of the target components, a value that

is indistinguishable from that of Cha I single stars. Only the closest

binaries (

Organisation(s)

Department of Astrophysics

External organisation(s)

Max-Planck-Institut für Astronomie, European Southern Observatory (Germany), University of Toronto, University of Hawaii, Eberhard Karls Universität Tübingen, National Aeronautics & Space Administration (NASA), Universität Stuttgart

Journal

Astronomy & Astrophysics

Volume

554

No. of pages

25

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361/201321220

Publication date

06-2013

Peer reviewed

Yes

Austrian Fields of Science 2012

103004 Astrophysics, 103003 Astronomy

Keywords

Portal url

https://ucrisportal.univie.ac.at/en/publications/8ea33af1-b3bf-4332-8346-d71022dcbae0