Discovery of a New Molecular Bubble-Outflow Structure in the Taurus B18 Cloud

Abstract

Star formation can produce bubbles and outflows, as a result of stellar feedback. Outflows and bubbles inject momentum and energy into the surrounding interstellar medium, and so are related to the overall energy balance of the molecular cloud. Molecular bubbles can be resolved by higher-resolution radio telescopes to quantify the effect of star formation on molecular clouds. We report here the identification of a new molecular bubble with an outflow, and an Herbig Haro object, HH319, located at the bubble center. Multi-wavelength data have been utilized to study its spatial structure, energy injection, and dynamical timescale. This bubble has a kinetic energy of $5.8\times 10^{43}$ erg within the smallest radius of a bubble in Taurus, 0.077 pc. The bubble formed $\sim$70,000 years ago. According to the proper motion velocities of protostars from $Gaia$ EDR3, the T Tauri binary stars (FY Tau and FZ Tau) at the southwest edge of the bubble may have produced the outflow-bubble structure. This is an unusual new structure found in low- and intermediate-mass star formation regions. Only a bubble in Orion A, driven by V380 Ori, has a similar structure. The bubble-outflow structure provides additional observational evidence for the theory of stellar wind from T Tauri stars. It enhances our understanding of how stellar feedback acts on molecular clouds.

Accepted for publication in ApJ. 14 pages, 2 tables, 9 figures

References in corpus (9)

• The Gaia mission
• Theory of Star Formation
• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• The relation between gas and dust in the Taurus Molecular Cloud
• The Herschel-ATLAS Data Release 1 Paper I: Maps, Catalogues and Number Counts
• The Five College Radio Astronomy Observatory CO Mapping Survey of the Taurus Molecular Cloud
• First Confirmed Detection of a Bipolar Molecular Outflow from a Young Brown Dwarf
• Understanding the angular momentum evolution of T Tauri and Herbig Ae/Be stars
• Numerical Simulation and Completeness Survey of Bubbles in the Taurus and Perseus Molecular Clouds

Cited by in corpus (3)

• A High-Mass Young Star-forming Core Escaping from Its Parental Filament
• Updated Inventory of Carbon Monoxide in The Taurus Molecular Cloud
• Dense Molecular Ring-like structure in gaseous CO depletion region G34.74-0.12