The Circumestellar Disk of the B0 Protostar Powering the HH 80-81 Radio Jet

• Published in: The Astrophysical journal Vol. 847; no. 1; pp. 58 - 67
• Main Authors: Girart, J. M., Estalella, R., Fernández-López, M., Curiel, S., Frau, P, Galvan-Madrid, R., Rao, R., Busquet, G., Juárez, C.
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 20.09.2017; IOP Publishing
• Subjects: Angular resolution; Astrophysics; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; Continuum radiation; COSMIC DUST; EMISSION; HYDROCYANIC ACID; INCLINATION; ISM: individual objects (GGD27, HH 80-81, IRAS 18162-2048); ISM: molecules; Kinematics; MASS; METHANOL; MOLECULES; PROTOSTARS; Radio jets (astronomy); RESOLUTION; Rotating disks; SPECTRA; STAR EVOLUTION; STARS; stars: formation; submillimeter: ISM; SULFUR; SULFUR DIOXIDE
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/aa81c9

We present subarcsecond angular resolution observations carried out with the Submillimeter Array (SMA) at 880 m 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).