Knotty protostellar jets as a signature of episodic protostellar accretion?

Abstract

We aim at studying the causal link between the knotty jet structure in CARMA 7, a young Class 0 protostar in the Serpens South cluster, and episodic accretion in young protostellar disks. We used numerical hydrodynamics simulations to derive the protostellar accretion history in gravitationally unstable disks around solar-mass protostars. We compared the time spacing between luminosity bursts Δτ_mod, caused by dense clumps spiralling on the protostar, with the differences of dynamical timescales between the knots Δτ_obs in CARMA 7. We found that the time spacing between the bursts have a bi-modal distribution caused by isolated and clustered luminosity bursts. The former are characterized by long quiescent periods between the bursts with Δτ_mod = a few * (10^3-10^4) yr, whereas the latter occur in small groups with time spacing between the bursts Δτ_mod= a few * (10-10^2) yr. For the clustered bursts, the distribution of Δτ_mod in our models can be fit reasonably well to the distribution of Δτ_obs in the protostellar jet of CARMA 7, if a certain correction for the (yet unknown) inclination angle with respect to the line of sight is applied. The K-S test on the model and observational data sets suggests the best-fit values for the inclination angles of 55-80 deg., which become narrower (75-80 deg.) if only strong luminosity bursts are considered. The dynamical timescales of the knots in the jet of CARMA 7 are too short for a meaningful comparison with the long time spacings between isolated bursts in our models. The exact sequences of time spacings between the luminosity bursts in our models and knots in the jet of CARMA 7 were found difficult to match. (abridged)

Accepted for publication in Astronomy & Astrophysics

References in corpus (14)

• Variable protostellar accretion with episodic bursts
• Global Models for the Evolution of Embedded, Accreting Protostellar Disks
• On the existence of accretion-driven bursts in massive star formation
• HOPS 383: An Outbursting Class 0 Protostar in Orion
• Secular evolution of viscous and self-gravitating circumstellar discs
• Molecule sublimation as a tracer of protostellar accretion: Evidence for accretion bursts from high angular resolution C18O images
• Evolution of dust and ice features around FU Orionis objects
• The ALMA early science view of FUor/EXor objects - V: continuum disc masses and sizes
• The chemistry of episodic accretion in embedded objects. 2D radiation thermo-chemical models of the post-burst phase
• Protostellar accretion traced with chemistry. High resolution C18O and continuum observations towards deeply embedded protostars in Perseus
• EXor outbursts from disk amplification of stellar magnetic cycles
• Mass transport from the envelope to the disk of V346 Nor: a case study for the luminosity problem in an FUor-type young eruptive star
• V346 Normae: First post-outburst observations of an FU Orionis star
• The Role for the Inner Disk in Mass Accretion to the Star in the Early Phase of Star Formation

Cited by in corpus (29)

• Chronology of Episodic Accretion in Protostars -- an ALMA survey of the CO and H${}_2$O snowlines
• The ALMA Survey of 70 $\mu \mathrm{m}$ Dark High-mass Clumps in Early Stages (ASHES). II: Molecular Outflows in the Extreme Early Stages of Protocluster Formation
• Burst occurrence in young massive stellar objects
• Episodic accretion constrained by a rich cluster of outflows
• First Detection of Interaction between a Magnetic Disk Wind and an Episodic Jet in a Protostellar System
• Young Faithful: The Eruptions of EC 53 as It Cycles through Filling and Draining the Inner Disk
• Evolution of dust in protoplanetary disks of eruptive stars
• Parameter study for the burst mode of accretion in massive star formation
• Accretion bursts in high-mass protostars: a new testbed for models of episodic accretion
• Outflows, envelopes, and disks as evolutionary indicators in Lupus YSOs
• The He I $\lambda$10830 $\mathring{A}$ line as a probe of winds and accretion in young stars in Lupus and Upper Scorpius
• A fallback accretion model for the unusual type II-P supernova iPTF14hls
• Multi-epoch SMA observations of the L1448C(N) protostellar SiO jet
• Episodic accretion and mergers during growth of massive protostars
• The Asymmetric Bipolar Fe II Jet and H2 Outflow of TMC1A Resolved with JWST's NIRSpec IFU
• An ALMA Study of the FU-Ori Type Object V900 Mon: Implications for the Progenitor
• PRODIGE -- envelope to disk with NOEMA. IV. An infalling gas bridge surrounding two Class 0/I systems in L1448N
• Evolution of a Viscous Protoplanetary Disk with Convectively Unstable Regions
• Magnetic disk winds in protoplanetary disks: Description of the model and impact on global disk evolution
• Constraining the Chemical Signatures and the Outburst Mechanism of the Class 0 Protostar HOPS 383
• The burst mode of accretion in massive star formation with stellar inertia
• The Role of Thermal Instability in Accretion Outbursts in High-Mass Stars
• Probing episodic accretion with chemistry: CALYPSO observations of IRAM 04191+1522. Results from the CALYPSO IRAM-PdBI survey
• Protostellar Outflows: a window to the past
• M17 MIR: A Massive Star is Forming via Episodic Mass Accretion
• A semi-analytic model for the temporal evolution of the episodic disc-to-star accretion rate during star formation
• Dust in the wind of outbursting young stars
• Early Planet Formation in Embedded Disks (eDisk). XX. Constraining the Chemical Tracers of Young Protostellar Sources
• Identifying the Mechanisms of Water Maser Variability During the Accretion Burst in NGC6334I