Title
Polarimetry of the binary PDS 144
Date Issued
07 February 2012
Access level
metadata only access
Resource Type
journal article
Author(s)
Observatório Nacional, São Cristovão
Publisher(s)
EDP Sciences
Abstract
Aims. Our goal is to study the circumstellar environment associated with each component of the wide intermediate-mass pre-main sequence binary system PDS 144 using broadband polarimetry. Methods. We present near-infrared (NIR) linear polarimetric observations of PDS 144 gathered with the IAGPOL imaging polarimeter along with the CamIV infrared camera at the Observatório do Pico dos Dias (OPD). In addition, we re-analyzed OPD archive optical polarization to separate the binary and estimate the interstellar polarization using foreground stars. Results. After discounting the interstellar component, we found that both stars of the binary system are intrinsically polarized. The polarization vectors at optical and NIR bands of both components are aligned with the local magnetic field and the jet axis. These findings indicate an interplay between the interstellar magnetic field and the formation of the binary system. We also found that the PDS 144N is less polarized than its southern companion in the optical. However, in the NIR PDS 144N is more polarized. Our polarization data can only be explained by high inclinations (i ≈ 80°) for the disks of both members. In particular, comparisons of our NIR data with young stellar objects disk models suggest predominantly small grains in the circumstellar environment of PDS 144N. In spite of the different grain types in each component, the infrared spectral indexes indicate a coeval system. We also found evidence of coplanarity between the disks. © 2012 ESO.
Volume
538
Language
English
OCDE Knowledge area
Física y Astronomía
Subjects
Scopus EID
2-s2.0-84856509776
Source
Astronomy and Astrophysics
ISSN of the container
00046361
Sponsor(s)
A.P. thanks CNPq (DTI grant 382.585/07−03 associated with the PCI/MCT/ON program). A.M.M. acknowledges support from FAPESP (grant 01/12589−1) and CNPq. C.V.R. thanks CNPq (grant 308005/2009−0).
Sources of information:
Directorio de Producción Científica
Scopus