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dc.contributor.authorCoutens, A.
dc.contributor.authorLiu, H. B.
dc.contributor.authorJiménez-Serra, I.
dc.contributor.authorBourke, T. L.
dc.contributor.authorForbrich, J.
dc.contributor.authorHoare, M.
dc.contributor.authorLoinard, L.
dc.contributor.authorTesti, L.
dc.contributor.authorAudard, M.
dc.contributor.authorCaselli, P.
dc.contributor.authorChacón-Tanarro, A.
dc.contributor.authorCodella, C.
dc.contributor.authorFrancesco, J. Di
dc.contributor.authorFontani, F.
dc.contributor.authorHogerheijde, M.
dc.contributor.authorJohansen, A.
dc.contributor.authorJohnstone, D.
dc.contributor.authorMaddison, S.
dc.contributor.authorPanić, O.
dc.contributor.authorPérez, L. M.
dc.contributor.authorPodio, L.
dc.contributor.authorPunanova, A.
dc.contributor.authorRawlings, J. M. C.
dc.contributor.authorSemenov, D.
dc.contributor.authorTazzari, M.
dc.contributor.authorTobin, J. J.
dc.contributor.authorWiel, M. H. D. van der
dc.contributor.authorLangevelde, H. J. van
dc.contributor.authorVlemmings, W.
dc.contributor.authorWilner, D.
dc.date.accessioned2020-09-24T00:07:44Z
dc.date.available2020-09-24T00:07:44Z
dc.date.issued2019-10-21
dc.identifier.citationCoutens , 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 , Francesco , J D , 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 , Wiel , M H D V D , Langevelde , H J V , Vlemmings , W & Wilner , D 2019 , ' VLA cm-wave survey of young stellar objects in the Oph A cluster : constraining extreme UV- and X-ray-driven disk photo-evaporation -- A pathfinder for Square Kilometre Array studies ' , Astronomy & Astrophysics . https://doi.org/10.1051/0004-6361/201935340
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 17359639
dc.identifier.otherPURE UUID: 5036107a-95b3-4a3f-9f43-81dfa8b1ca14
dc.identifier.otherArXiv: http://arxiv.org/abs/1909.03515v1
dc.identifier.otherORCID: /0000-0001-8694-4966/work/80948535
dc.identifier.otherScopus: 85074453310
dc.identifier.urihttp://hdl.handle.net/2299/23162
dc.description© A. Coutens et al. 2019
dc.description.abstractObservations of young stellar objects (YSOs) in centimeter bands can probe the continuum emission from growing dust grains, ionized winds, and magnetospheric activity, which are intimately connected to the evolution of protoplanetary disks and the formation of planets. We have 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$'$ with a spatial resolution of $\theta_{maj}$ $\times$ $\theta_{min}$ $\sim$ 0.4$''$ $\times$ 0.2$''$. We achieved a 5 $\mu$Jy beam$^{-1}$ root-mean-square noise level at the center of our mosaic field of view. Among the eighteen sources we detected, sixteen are YSOs (three Class 0, five Class I, six Class II, and two Class III) and two are extragalactic candidates. We find that thermal dust emission generally contributes less that 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 photo-evaporated disk material, and/or 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 towards Class II/III disks suggest that extreme UV-driven photoevaporation is insufficient to explain the disk dispersal, assuming that the contribution of UV photoevaporating stellar winds to radio flux does not evolve with time. The sensitivity of our data cannot exclude photoevaporation due to X-ray photons as an efficient mechanism for disk dispersal. Deeper surveys with the Square Kilometre Array will be able to provide strong constraints on disk photoevaporation.en
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.subjectastro-ph.SR
dc.subjectastro-ph.GA
dc.titleVLA cm-wave survey of young stellar objects in the Oph A cluster : constraining extreme UV- and X-ray-driven disk photo-evaporation -- A pathfinder for Square Kilometre Array studiesen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/201935340
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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