Infrared Polarimetry of Very Young Objects Including the Becklinneugebauer Source

Polarimetry of young stellar objects { III

We present the rst imaging circular polarimetry of the Orion Molecular Cloud, OMC-1. The observations, taken in the J , H , K n and nbL bands, reveal a complex pattern of circular polarisation. Globally, there is a background circular polarisation of the order of 2 percent in the K n band, conforming to the typical quadrupolar patterns that have been observed in other outtow sources. Overlaying...

Near-Infrared Spectroscopy of Very Low-Luminosity Young Stellar Objects in the Taurus Molecular Cloud

We have carried out near-infrared spectroscopic observations of 23 very low-luminosity young stellar object (YSO) candidates and 5 their companions in Heiles Cloud 2, one of the densest parts of the Taurus molecular cloud. Twelve objects were confirmed as YSOs by Brγ feature. The effective temperatures of the YSOs and of the companions are estimated from the 2.26 μm feature, the 2.21 μm feature...

Near-infrared imaging polarimetry of dusty young stars

We have carried out JHK polarimetric observations of eleven dusty young stars, by using the polarimeter module IRPOL2 with the near-IR camera UIST on the 3.8-m United Kingdom Infrared Telescope (UKIRT). Our sample targeted systems for which UKIRT-resolvable discs had been predicted by model fits to their spectral energy distributions. Our observations have confirmed the presence of extended pol...

Infrared Classi cation of Young Stellar Objects

Polarimetry of Compact Symmetric Objects

We present multi-frequency VLBA observations of two polarized Compact Symmetric Objects (CSOs), J0000+4054 and J1826+1831, and a polarized CSO candidate, J1915+6548. Using the wavelength-squared dependence of Fara-day rotation, we obtained rotation measures (RMs) of −180±10 rad m −2 and 1540±7 rad m −2 for the latter two sources. These are lower than what is expected of CSOs (several 1000 rad m...