Bibcode
Riaz, B.; Martín, E. L.; Bouy, H.; Tata, R.
Referencia bibliográfica
The Astrophysical Journal, Volume 700, Issue 2, pp. 1541-1551 (2009).
Fecha de publicación:
8
2009
Revista
Número de citas
17
Número de citas referidas
17
Descripción
We present near-infrared observations of the low-mass deeply embedded
Class 0/I system 2MASS J17112318-2724315 (2M171123) in the B59 molecular
cloud. Bright scattered light nebulosity is observed toward this source
in the Ks images, that seems to trace the edges of an outflow
cavity. We report the detection of a low-luminosity protostar
2M17112255-27243448 (2M17112255) that lies ~8'' (~1000 AU) from
2M171123. This is a Class I system, as indicated by its 2-8 μm slope
and Infrared Array Camera colors, with an estimated internal luminosity
of ~0.3 L sun. We estimate a mass of ~0.12-0.25 M
sun for this source, at an age of 0.1-1 Myr. Also presented
is detailed modeling of the 2M171123 system. The best-fit parameters
indicate a large envelope density of the order of ~10-13 g
cm-3, and an intermediate inclination between 53° and
59°. The observed Ks -band variability for this system
could be explained by slight variability in the mass infall rate between
2.5E-5 and 1.8E-5 M sun yr-1. The protostar
2M171123 exhibits a rarely observed absorption feature near 11.3 μm
within its 10 μm silicate band. We find a strong correlation between
the strength in this 11.3 μm "edge" and the H2O-ice column
density, indicating the origin of this feature in the thickness of the
ice mantle over the silicate grains.