The circumstellar environment of the YSO TMR-1 and a revisit to the
  candidate very low-mass object TMR-1C
  TMR-1 (IRAS~04361+2547) is a class~I proto-stellar source located in the
nearby Taurus star-forming region. Its circumstellar environment is
characterized by extended dust emission with complex structures and conspicuous
filaments. A faint companion, called TMR-1C, located near the proto-star had
been detected in previous studies, but its nature as a very young substellar
object remained inconclusive. To improve the constraints on the nature of
TMR-1C, and to investigate the process of very low-mass star formation in the
TMR-1 system we use very sensitive infrared imaging observations as well as NIR
spectroscopy. We construct the SED of TMR-1C over a much larger wavelength
range as had been possible in previous work and compare it with models of
extincted background stars, young sub-stellar objects, and very low-mass stars
with circumstellar disk and envelope emission. We also search for additional
low-luminosity objects in the immediate environment of the TMR-1, study the
surrounding NIR dust morphology, and analyse the emission line spectrum of a
filamentary structure in the physical context of a bow-shock model. We find
that the observed SED of TMR-1C is inconsistent with an extincted background
star, nor can be fitted with available models for a young extremely low-mass
(<12M_Jup) object. Our near-IR spectrum indicates an effective temperature of
at least ~3000K. Based on a good match of TMR-1C's SED with radiation transfer
models of young stellar objects with circumstellar disks, we propose that
TMR-1C is most likely a very low-mass star with M~0.1-0.2M_sun surrounded by a
circumstellar disk with high inclination, i>80deg. Moreover, we detect an
additional very faint source, which we call TMR-1D, and that shows a quite
striking symmetry in position with TMR-1C. TMR-1C and TMR-1D may have been
formed from a common triggered star-formation event, caused by... (abstract
abridged)
