Subarcsecond high-sensitivity measurements of the DG Tau jet with e-MERLIN

Rachael E. Ainsworth; Tom P. Ray; Anna M. M. Scaife; Jane S. Greaves; Rob J. Beswick

doi:10.1093/mnrasl/slt114

Subarcsecond high-sensitivity measurements of the DG Tau jet with e-MERLIN

Rachael E. Ainsworth^*, Tom P. Ray, Anna M. M. Scaife, Jane S. Greaves, Rob J. Beswick

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We present very high spatial resolution deep radio continuum observations at 5 GHz (6 cm) made with the extended Multi-Element Radio Linked Interferometer Network (e-MERLIN) of the young stars DG Tau A and B. Assuming it is launched very close (similar or equal to 1 au) from the star, our results suggest that the DG Tau A outflow initially starts as a poorly focused wind and undergoes significant collimation farther along the jet (similar or equal to 50 au). We derive jet parameters for DG Tau A and find an initial jet opening angle of 86 degrees within 2 au of the source, a mass-loss rate of 1.5 x 10(-8) M-circle dot yr(-1) for the ionized component of the jet, and the total ejection-to-accretion ratio to range from 0.06 to 0.3. These results are in line with predictions from magnetohydrodynamic jet-launching theories.

Original language	English
Pages (from-to)	L64-L68
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society
Volume	436
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slt114
Publication status	Published - Nov 2013

Keywords

radiation mechanisms: general
stars: formation
HUBBLE-SPACE-TELESCOPE
RADIO-CONTINUUM OBSERVATIONS
OBSERVED SPATIAL STRUCTURE
YOUNG STARS
MASS-LOSS
VLA OBSERVATIONS
OPTICAL OUTFLOW
STELLAR WINDS
DISK WIND
ACCRETION

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10.1093/mnrasl/slt114

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089
Bonnell, I. A. (PI), Cameron, A. C. (CoI), Dominik, M. (CoI), Driver, S. P. (CoI), Greaves, J. S. (CoI), Horne, K. D. (CoI), Jardine, M. M. (CoI), Wood, K. (CoI) & Zhao, H. (CoI)
Science & Technology Facilities Council
1/04/09 → 31/03/12
Project: Standard

Cite this

@article{ac26d38cd85644f0a7bdcd14be3c9db0,

title = "Subarcsecond high-sensitivity measurements of the DG Tau jet with e-MERLIN",

abstract = "We present very high spatial resolution deep radio continuum observations at 5 GHz (6 cm) made with the extended Multi-Element Radio Linked Interferometer Network (e-MERLIN) of the young stars DG Tau A and B. Assuming it is launched very close (similar or equal to 1 au) from the star, our results suggest that the DG Tau A outflow initially starts as a poorly focused wind and undergoes significant collimation farther along the jet (similar or equal to 50 au). We derive jet parameters for DG Tau A and find an initial jet opening angle of 86 degrees within 2 au of the source, a mass-loss rate of 1.5 x 10(-8) M-circle dot yr(-1) for the ionized component of the jet, and the total ejection-to-accretion ratio to range from 0.06 to 0.3. These results are in line with predictions from magnetohydrodynamic jet-launching theories.",

keywords = "radiation mechanisms: general, stars: formation, HUBBLE-SPACE-TELESCOPE, RADIO-CONTINUUM OBSERVATIONS, OBSERVED SPATIAL STRUCTURE, YOUNG STARS, MASS-LOSS, VLA OBSERVATIONS, OPTICAL OUTFLOW, STELLAR WINDS, DISK WIND, ACCRETION",

author = "Ainsworth, {Rachael E.} and Ray, {Tom P.} and Scaife, {Anna M. M.} and Greaves, {Jane S.} and Beswick, {Rob J.}",

year = "2013",

month = nov,

doi = "10.1093/mnrasl/slt114",

language = "English",

volume = "436",

pages = "L64--L68",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

TY - JOUR

T1 - Subarcsecond high-sensitivity measurements of the DG Tau jet with e-MERLIN

AU - Ainsworth, Rachael E.

AU - Ray, Tom P.

AU - Scaife, Anna M. M.

AU - Greaves, Jane S.

AU - Beswick, Rob J.

PY - 2013/11

Y1 - 2013/11

N2 - We present very high spatial resolution deep radio continuum observations at 5 GHz (6 cm) made with the extended Multi-Element Radio Linked Interferometer Network (e-MERLIN) of the young stars DG Tau A and B. Assuming it is launched very close (similar or equal to 1 au) from the star, our results suggest that the DG Tau A outflow initially starts as a poorly focused wind and undergoes significant collimation farther along the jet (similar or equal to 50 au). We derive jet parameters for DG Tau A and find an initial jet opening angle of 86 degrees within 2 au of the source, a mass-loss rate of 1.5 x 10(-8) M-circle dot yr(-1) for the ionized component of the jet, and the total ejection-to-accretion ratio to range from 0.06 to 0.3. These results are in line with predictions from magnetohydrodynamic jet-launching theories.

AB - We present very high spatial resolution deep radio continuum observations at 5 GHz (6 cm) made with the extended Multi-Element Radio Linked Interferometer Network (e-MERLIN) of the young stars DG Tau A and B. Assuming it is launched very close (similar or equal to 1 au) from the star, our results suggest that the DG Tau A outflow initially starts as a poorly focused wind and undergoes significant collimation farther along the jet (similar or equal to 50 au). We derive jet parameters for DG Tau A and find an initial jet opening angle of 86 degrees within 2 au of the source, a mass-loss rate of 1.5 x 10(-8) M-circle dot yr(-1) for the ionized component of the jet, and the total ejection-to-accretion ratio to range from 0.06 to 0.3. These results are in line with predictions from magnetohydrodynamic jet-launching theories.

KW - radiation mechanisms: general

KW - stars: formation

KW - HUBBLE-SPACE-TELESCOPE

KW - RADIO-CONTINUUM OBSERVATIONS

KW - OBSERVED SPATIAL STRUCTURE

KW - YOUNG STARS

KW - MASS-LOSS

KW - VLA OBSERVATIONS

KW - OPTICAL OUTFLOW

KW - STELLAR WINDS

KW - DISK WIND

KW - ACCRETION

U2 - 10.1093/mnrasl/slt114

DO - 10.1093/mnrasl/slt114

M3 - Article

SN - 0035-8711

VL - 436

SP - L64-L68

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Subarcsecond high-sensitivity measurements of the DG Tau jet with e-MERLIN

Abstract

Keywords

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Projects

Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089

Cite this