Wide-angle protostellar outflows driven by narrow jets in stratified cores

Abstract

Most simulations of outflow feedback on star formation are based on the assumption that outflows are driven by a wide angle "X-wind," rather than a narrow jet. However, the arguments initially raised against pure jet-driven flows were based on steady ejection in a uniform medium, a notion that is no longer supported based on recent observations. We aim to determine whether a pulsed narrow jet launched in a density-stratified, self-gravitating core could reproduce typical molecular outflow properties, without the help of a wide-angle wind component. We performed axisymmetric hydrodynamic simulations using the MPI-AMRVAC code with optically thin radiative cooling on timescales up to 10000 yrs. Then we computed and compared the predicted properties with observational data. First, the jet-driven shell expands faster and wider through a core with steeply decreasing density than through an uniform core. Second, when blown into the same singular flattened core, a jet-driven shell has a similar width as a wide-angle wind-driven shell in the first few hundred years, but a decelerating expansion on long timescales. The flow adopts a conical shape and a base opening angle reaching up to $90\unicode{xb0}$. Third, after $\sim$ 10000 yrs, a pulsed jet-driven shell shows fitting features and a qualitative resemblance with recent observations of protostellar outflows with the Atacama Large Millimeter Array (ALMA), such as HH46-47 and CARMA-7. In particular, similarities are seen in the shell widths, opening angles, position-velocity diagrams, and mass-velocity distribution, with some showing a closer resemblance than in simulations based on a wide-angle "X-wind" model. Therefore, a realistic ambient density stratification in addition to millenia-long integration times are equally essential to reliably predict the properties of outflows driven by a pulsed jet and to confront them with the observations.

20 pages, 13 figures, accepted for publication in A&A, Reproduced with permission from Astronomy & Astrophysics, ©ESO

References in corpus (11)

• MPI-AMRVAC for Solar and Astrophysics
• Modeling jet and outflow feedback during star cluster formation
• Shells, jets, and internal working surfaces in the molecular outflow from IRAS 04166+2706
• A systematic description of wind-driven protoplanetary discs
• Jet Motion, Internal Working Surfaces, and Nested Shells in the Protostellar System HH 212
• ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP) II. Survey overview: a first look at 1.3 mm continuum maps and molecular outflows
• The Rate, Amplitude and Duration of Outbursts from Class 0 Protostars in Orion
• Magnetic braking of accreting T Tauri stars: Effects of mass accretion rate, rotation, and dipolar field strength
• An HST Survey of Protostellar Outflow Cavities: Does Feedback Clear Envelopes?
• A spider-like outflow in Barnard 5 - IRS 1: The transition from a collimated jet to a wide-angle outflow?
• Steady Wind-Blown Cavities within Infalling Rotating Envelopes: Application to the Broad Velocity Component in Young Protostars

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• JWST Observations of Young protoStars (JOYS): Linked accretion and ejection in a Class I protobinary system
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• The Evolution of Protostellar Outflow Cavities, Kinematics, and Angular Distribution of Momentum and Energy in Orion A: Evidence for Dynamical Cores
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• PROJECT-J: the shocking H2 outflow from HH46
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