183 GHz H${}_2$O maser emission around the low-mass protostar Serpens SMM1

Abstract

We report the first interferomteric detection of 183 GHz water emission in the low-mass protostar Serpens SMM1 using the Submillimeter Array with a resolution of 3$"$ and rms of $\sim$7 Jy in a 3 km s${}^{-1}$ bin. Due to the small size and high brightnessof more than 240 Jy/beam, it appears to be maser emission. In total three maser spots were detected out to $\sim$ 700 AU from the central protostar, lying along the red-shifted outflow axis, outside the circumstellar disk but within the envelope region as evidenced by the continuum measurements. Two of the maser spots appear to be blue-shifted by about 1 to 2 km s${}^{-1}$. No extended or compact thermal emission from a passively heated protostellar envelope was detected with a limit of 7 Jy (16 K), in agreement with recent modelling efforts. We propose that the maser spots originate within the cavity walls due to the interaction of the outflow jet with the surrounding protostellar envelope. Hydrodynamical models predict that such regions can be dense and warm enough to invert the 183 GHz water transition.

Accepted for ApJ letters, 2 figures

References in corpus (3)

• APEX-CHAMP+ high-J CO observations of low-mass young stellar objects: I. The HH 46 envelope and outflow
• SWAS Observations of Water in Molecular Outflows
• Modeling water emission from low-mass protostellar envelopes

Cited by in corpus (11)

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• ALMA observations of dust polarization and molecular line emission from the Class 0 protostellar source Serpens SMM1
• The Physics of Water Masers observable with ALMA and SOFIA: Model Predictions for Evolved Stars
• Characterizing magnetic field morphologies in three Serpens protostellar cores with ALMA
• Chemical and kinematic structure of extremely high-velocity molecular jets in the Serpens Main star-forming region
• Atomic jet from SMM1 (FIRS1) in Serpens uncovers non-coeval binary companion
• Linear polarization of submillimetre masers. Tracing magnetic fields with ALMA
• Sub-arcsecond SMA observations of the prototype Class 0 object VLA1623 at 1.3 mm: A single protostar with a structured outflow cavity ?
• Outflow forces in intermediate mass star formation
• Collisional Pumping of H${}_2$O and CH${}_3$OH Masers in C-Type Shock Waves
• Survey of (sub)mm water masers in low-mass star-forming regions