A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium
Elisabete M. De Gouveia Dal Pino, Mark Birkinshaw, Willy Benz
Most collimated supersonic protostellar jets show a collimated wiggling, and knotty structure (e.g., the Haro 6-5B jet) and frequently reveal a long gap between this structure and the terminal bow shock. In a few cases, there is no evidence of such a terminal feature. We present three-dimensional smoothed particle hydrodynamical simulations that suggest that this morphology may be due to the interaction of the propagating cooling jet with a nonhomogeneous ambient medium. In regions where the ambient gas has an increasing density (and pressure) gradient, we find that it tends to compress the cold, low-pressure cocoon of shocked material that surrounds the beam, destroy the bow shock-like structure at the head, and enhance beam focusing, wiggling, and internal traveling shocks. In ambient regions of decreasing density (and pressure), the flow widens and relaxes, becoming very faint. This could explain "invisible" segments in systems like the Haro 6-5B jet. The bow shock in these cases could be a relic of an earlier outflow episode, as previously suggested, or the place where the jet reappears after striking a denser portion of the ambient medium.
L111-L114
Astrophysical Journal Letters
https://doi.org/10.1086/309978/pdf
Hydrodynamics
ISM: jets and outflows
Stars: mass loss
Stars: pre-main-sequence
10.1086/309978/pdf
Fingerprint Dive into the research topics of 'A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium'. Together they form a unique fingerprint.
bows Physics & Astronomy
shock Physics & Astronomy
simulation Earth & Environmental Sciences
cocoon Earth & Environmental Sciences
pressure gradients Physics & Astronomy
pressure gradient Earth & Environmental Sciences
low pressure Earth & Environmental Sciences
outflow Earth & Environmental Sciences
De Gouveia Dal Pino, E. M., Birkinshaw, M., & Benz, W. (1996). A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium. Astrophysical Journal Letters, 460(2), L111-L114. https://doi.org/10.1086/309978/pdf
De Gouveia Dal Pino, Elisabete M. ; Birkinshaw, Mark ; Benz, Willy. / A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium. In: Astrophysical Journal Letters. 1996 ; Vol. 460, No. 2. pp. L111-L114.
@article{9d954b1827d847b0805448c73e8922c9,
title = "A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium",
abstract = "Most collimated supersonic protostellar jets show a collimated wiggling, and knotty structure (e.g., the Haro 6-5B jet) and frequently reveal a long gap between this structure and the terminal bow shock. In a few cases, there is no evidence of such a terminal feature. We present three-dimensional smoothed particle hydrodynamical simulations that suggest that this morphology may be due to the interaction of the propagating cooling jet with a nonhomogeneous ambient medium. In regions where the ambient gas has an increasing density (and pressure) gradient, we find that it tends to compress the cold, low-pressure cocoon of shocked material that surrounds the beam, destroy the bow shock-like structure at the head, and enhance beam focusing, wiggling, and internal traveling shocks. In ambient regions of decreasing density (and pressure), the flow widens and relaxes, becoming very faint. This could explain {"}invisible{"} segments in systems like the Haro 6-5B jet. The bow shock in these cases could be a relic of an earlier outflow episode, as previously suggested, or the place where the jet reappears after striking a denser portion of the ambient medium.",
keywords = "Hydrodynamics, ISM: jets and outflows, Stars: mass loss, Stars: pre-main-sequence",
author = "{De Gouveia Dal Pino}, {Elisabete M.} and Mark Birkinshaw and Willy Benz",
doi = "10.1086/309978/pdf",
pages = "L111--L114",
journal = "Astrophysical Journal Letters",
publisher = "IOP Publishing",
De Gouveia Dal Pino, EM, Birkinshaw, M & Benz, W 1996, 'A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium', Astrophysical Journal Letters, vol. 460, no. 2, pp. L111-L114. https://doi.org/10.1086/309978/pdf
A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium. / De Gouveia Dal Pino, Elisabete M.; Birkinshaw, Mark; Benz, Willy.
In: Astrophysical Journal Letters, Vol. 460, No. 2, 01.04.1996, p. L111-L114.
T1 - A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium
AU - De Gouveia Dal Pino, Elisabete M.
AU - Birkinshaw, Mark
AU - Benz, Willy
N2 - Most collimated supersonic protostellar jets show a collimated wiggling, and knotty structure (e.g., the Haro 6-5B jet) and frequently reveal a long gap between this structure and the terminal bow shock. In a few cases, there is no evidence of such a terminal feature. We present three-dimensional smoothed particle hydrodynamical simulations that suggest that this morphology may be due to the interaction of the propagating cooling jet with a nonhomogeneous ambient medium. In regions where the ambient gas has an increasing density (and pressure) gradient, we find that it tends to compress the cold, low-pressure cocoon of shocked material that surrounds the beam, destroy the bow shock-like structure at the head, and enhance beam focusing, wiggling, and internal traveling shocks. In ambient regions of decreasing density (and pressure), the flow widens and relaxes, becoming very faint. This could explain "invisible" segments in systems like the Haro 6-5B jet. The bow shock in these cases could be a relic of an earlier outflow episode, as previously suggested, or the place where the jet reappears after striking a denser portion of the ambient medium.
AB - Most collimated supersonic protostellar jets show a collimated wiggling, and knotty structure (e.g., the Haro 6-5B jet) and frequently reveal a long gap between this structure and the terminal bow shock. In a few cases, there is no evidence of such a terminal feature. We present three-dimensional smoothed particle hydrodynamical simulations that suggest that this morphology may be due to the interaction of the propagating cooling jet with a nonhomogeneous ambient medium. In regions where the ambient gas has an increasing density (and pressure) gradient, we find that it tends to compress the cold, low-pressure cocoon of shocked material that surrounds the beam, destroy the bow shock-like structure at the head, and enhance beam focusing, wiggling, and internal traveling shocks. In ambient regions of decreasing density (and pressure), the flow widens and relaxes, becoming very faint. This could explain "invisible" segments in systems like the Haro 6-5B jet. The bow shock in these cases could be a relic of an earlier outflow episode, as previously suggested, or the place where the jet reappears after striking a denser portion of the ambient medium.
KW - Hydrodynamics
KW - ISM: jets and outflows
KW - Stars: mass loss
KW - Stars: pre-main-sequence
U2 - 10.1086/309978/pdf
DO - 10.1086/309978/pdf
SP - L111-L114
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
De Gouveia Dal Pino EM, Birkinshaw M, Benz W. A possible mechanism for wiggling protostellar jets from three-dimensional simulations in a stratified ambient medium. Astrophysical Journal Letters. 1996 Apr 1;460(2):L111-L114. https://doi.org/10.1086/309978/pdf