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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Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089
Bonnell, I. (PI), Cameron, A. (CoI), Dominik, M. (CoI), Driver, S. (CoI), Greaves, J. (CoI), Horne, K. (CoI), Jardine, 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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Astrophysics in St Andrews: Astrophysics in St Andrews / SUPA (Continuan of Rolling Grant - XPP089

Cite this