VLA cm-wave survey of young stellar objects in the Oph A cluster : Constraining extreme UV- And X-ray-driven disk photoevaporation: A pathfinder for Square Kilometre Array studies

Coutens, A.; Liu, H. B.; Jiménez-Serra, I.; Bourke, T. L.; Forbrich, J.; Hoare, M.; Loinard, L.; Testi, L.; Audard, M.; Caselli, P.; Chacón-Tanarro, A.; Codella, C.; Di Francesco, J.; Fontani, F.; Hogerheijde, M.; Johansen, A.; Johnstone, D.; Maddison, S.; Panić, O.; Pérez, L. M.; Podio, L.; Punanova, A.; Rawlings, J. M.C.; Semenov, D.; Tazzari, M.; Tobin, J. J.; Van Der Wiel, M. H.D.; Van Langevelde, H. J.; Vlemmings, W.; Walsh, C.; Wilner, D.

VLA cm-wave survey of young stellar objects in the Oph A cluster : Constraining extreme UV- And X-ray-driven disk photoevaporation: A pathfinder for Square Kilometre Array studies

Mark

Coutens, A. ; Liu, H. B. ; Jiménez-Serra, I. ; Bourke, T. L. ; Forbrich, J. ; Hoare, M. ; Loinard, L. ; Testi, L. ; Audard, M. and Caselli, P. , et al. (2019) In Astronomy and Astrophysics 631.

Abstract: Observations of young stellar objects (YSOs) in centimeter bands can probe the continuum emission from growing dust grains, ionized winds, and magnetospheric activity that are intimately connected to the evolution of protoplanetary disks and the formation of planets. We carried out sensitive continuum observations toward the Ophiuchus A star-forming region, using the Karl G. Jansky Very Large Array (VLA) at 10 GHz over a field-of-view of 6′ and with a spatial resolution of θ_maj ×θ_min ∼ 0.′′4 × 0.′′2. We achieved a 5 μJy beam^-1 rms noise level at the center of our mosaic field of view. Among the 18 sources we detected, 16 were YSOs (three Class 0, five Class I, six Class II, and two Class III) and two... (More); Observations of young stellar objects (YSOs) in centimeter bands can probe the continuum emission from growing dust grains, ionized winds, and magnetospheric activity that are intimately connected to the evolution of protoplanetary disks and the formation of planets. We carried out sensitive continuum observations toward the Ophiuchus A star-forming region, using the Karl G. Jansky Very Large Array (VLA) at 10 GHz over a field-of-view of 6′ and with a spatial resolution of θ_maj ×θ_min ∼ 0.′′4 × 0.′′2. We achieved a 5 μJy beam^-1 rms noise level at the center of our mosaic field of view. Among the 18 sources we detected, 16 were YSOs (three Class 0, five Class I, six Class II, and two Class III) and two were extragalactic candidates. We find that thermal dust emission generally contributed less than 30% of the emission at 10 GHz. The radio emission is dominated by other types of emission, such as gyro-synchrotron radiation from active magnetospheres, free-free emission from thermal jets, free-free emission from the outflowing photoevaporated disk material, and synchrotron emission from accelerated cosmic-rays in jet or protostellar surface shocks. These different types of emission could not be clearly disentangled. Our non-detections for Class II/III disks suggest that extreme UV-driven photoevaporation is insufficient to explain disk dispersal, assuming that the contribution of UV photoevaporating stellar winds to radio flux does not evolve over time. The sensitivity of our data cannot exclude photoevaporation due to the role of X-ray photons as an efficient mechanism for disk dispersal. Deeper surveys using the Square Kilometre Array (SKA) will have the capacity to provide significant constraints to disk photoevaporation.
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Please use this url to cite or link to this publication: https://lup.lub.lu.se/record/79572d6c-cba3-4f03-a397-276a2866d808

author

Coutens, A. ; Liu, H. B. ; Jiménez-Serra, I. ; Bourke, T. L. ; Forbrich, J. ; Hoare, M. ; Loinard, L. ; Testi, L. ; Audard, M. and Caselli, P. , et al. (More)

Coutens, A. ; Liu, H. B. ; Jiménez-Serra, I. ; Bourke, T. L. ; Forbrich, J. ; Hoare, M. ; Loinard, L. ; Testi, L. ; Audard, M. ; Caselli, P. ; Chacón-Tanarro, A. ; Codella, C. ; Di Francesco, J. ; Fontani, F. ; Hogerheijde, M. ; Johansen, A. ^LU ; Johnstone, D. ; Maddison, S. ; Panić, O. ; Pérez, L. M. ; Podio, L. ; Punanova, A. ; Rawlings, J. M.C. ; Semenov, D. ; Tazzari, M. ; Tobin, J. J. ; Van Der Wiel, M. H.D. ; Van Langevelde, H. J. ; Vlemmings, W. ; Walsh, C. and Wilner, D. (Less)

organization

publishing date

2019

type

Contribution to journal

publication status

published

subject

Astronomy, Astrophysics and Cosmology

keywords

Protoplanetary disks, Radio continuum: stars, Stars: activity, Stars: formation

in

Astronomy and Astrophysics

volume

631

article number

A58

publisher

EDP Sciences

external identifiers

scopus:85074453310

ISSN

0004-6361

DOI

10.1051/0004-6361/201935340

language

English

LU publication?

yes

id

79572d6c-cba3-4f03-a397-276a2866d808

date added to LUP

2019-11-20 12:01:05

date last changed

2024-04-16 23:45:38

@article{79572d6c-cba3-4f03-a397-276a2866d808,
  abstract     = {{<p>Observations of young stellar objects (YSOs) in centimeter bands can probe the continuum emission from growing dust grains, ionized winds, and magnetospheric activity that are intimately connected to the evolution of protoplanetary disks and the formation of planets. We carried out sensitive continuum observations toward the Ophiuchus A star-forming region, using the Karl G. Jansky Very Large Array (VLA) at 10 GHz over a field-of-view of 6′ and with a spatial resolution of θ<sub>maj</sub> ×θ<sub>min</sub> ∼ 0.′′4 × 0.′′2. We achieved a 5 μJy beam<sup>-1</sup> rms noise level at the center of our mosaic field of view. Among the 18 sources we detected, 16 were YSOs (three Class 0, five Class I, six Class II, and two Class III) and two were extragalactic candidates. We find that thermal dust emission generally contributed less than 30% of the emission at 10 GHz. The radio emission is dominated by other types of emission, such as gyro-synchrotron radiation from active magnetospheres, free-free emission from thermal jets, free-free emission from the outflowing photoevaporated disk material, and synchrotron emission from accelerated cosmic-rays in jet or protostellar surface shocks. These different types of emission could not be clearly disentangled. Our non-detections for Class II/III disks suggest that extreme UV-driven photoevaporation is insufficient to explain disk dispersal, assuming that the contribution of UV photoevaporating stellar winds to radio flux does not evolve over time. The sensitivity of our data cannot exclude photoevaporation due to the role of X-ray photons as an efficient mechanism for disk dispersal. Deeper surveys using the Square Kilometre Array (SKA) will have the capacity to provide significant constraints to disk photoevaporation.</p>}},
  author       = {{Coutens, A. and Liu, H. B. and Jiménez-Serra, I. and Bourke, T. L. and Forbrich, J. and Hoare, M. and Loinard, L. and Testi, L. and Audard, M. and Caselli, P. and Chacón-Tanarro, A. and Codella, C. and Di Francesco, J. and Fontani, F. and Hogerheijde, M. and Johansen, A. and Johnstone, D. and Maddison, S. and Panić, O. and Pérez, L. M. and Podio, L. and Punanova, A. and Rawlings, J. M.C. and Semenov, D. and Tazzari, M. and Tobin, J. J. and Van Der Wiel, M. H.D. and Van Langevelde, H. J. and Vlemmings, W. and Walsh, C. and Wilner, D.}},
  issn         = {{0004-6361}},
  keywords     = {{Protoplanetary disks; Radio continuum: stars; Stars: activity; Stars: formation}},
  language     = {{eng}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{VLA cm-wave survey of young stellar objects in the Oph A cluster : Constraining extreme UV- And X-ray-driven disk photoevaporation: A pathfinder for Square Kilometre Array studies}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/201935340}},
  doi          = {{10.1051/0004-6361/201935340}},
  volume       = {{631}},
  year         = {{2019}},
}

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VLA cm-wave survey of young stellar objects in the Oph A cluster : Constraining extreme UV- And X-ray-driven disk photoevaporation: A pathfinder for Square Kilometre Array studies