Artículos de revistas
The Circumestellar Disk of the B0 Protostar Powering the HH 80-81 Radio Jet
Fecha
2017-09Registro en:
Girart, J. M.; Estalella, R.; Fernandez Lopez, Manuel; Curiel, S.; Frau, P.; et al.; The Circumestellar Disk of the B0 Protostar Powering the HH 80-81 Radio Jet; IOP Publishing; Astrophysical Journal; 847; 1; 9-2017; 1-11
0004-637X
CONICET Digital
CONICET
Autor
Girart, J. M.
Estalella, R.
Fernandez Lopez, Manuel
Curiel, S.
Frau, P.
Galvan Madrid, R.
Rao, R.
Busquet, G.
Juárez, C.
Resumen
We present subarcsecond angular resolution observations carried out with the Submillimeter Array (SMA) at 880 μm centered at the B0-type protostar GGD27 MM1, the driving source of the parsec scale HH 80-81 jet. We constrain its polarized continuum emission to ≲0.8% at this wavelength. Its submillimeter spectrum is dominated by sulfur-bearing species tracing a rotating-disk-like structure (SO and SO2 isotopologues mainly), but also shows HCN-bearing and CH3OH lines, which trace the disk and the outflow cavity walls excavated by the HH 80-81 jet. The presence of many sulfurated lines could indicate the presence of shocked gas at the disk's centrifugal barrier or that MM1 is a hot core at an evolved stage. The resolved SO2 emission traces the disk kinematics very well and we fit the SMA observations using a thin-disk Keplerian model, which gives the inclination (47°), the inner (≲170 au) and outer (∼950-1300 au) radii, and the disk's rotation velocity (3.4 km s-1 at a putative radius of 1700 au). We roughly estimate a protostellar dynamical mass of 4-18 . MM2 and WMC cores show, comparatively, an almost empty spectra, suggesting that they are associated with extended emission detected in previous low-angular resolution observations, and therefore indicating youth (MM2) or the presence of a less massive object (WMC).