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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 photo-evaporation -- A pathfinder for Square Kilometre Array studies

hal.structure.identifierAMOR 2019
dc.contributor.authorCOUTENS, Audrey
dc.contributor.authorLIU, H. B.
hal.structure.identifierQueen Mary University of London [QMUL]
dc.contributor.authorJIMENEZ-SERRA, I.
dc.contributor.authorBOURKE, T. L.
dc.contributor.authorFORBRICH, J.
dc.contributor.authorHOARE, M.
hal.structure.identifierCentro de Radioastronomia y Astrofisica [CRyA]
dc.contributor.authorLOINARD, L.
hal.structure.identifierEuropean Southern Observatory [ESO]
dc.contributor.authorTESTI, L.
hal.structure.identifierUniversité de Genève = University of Geneva [UNIGE]
dc.contributor.authorAUDARD, M.
hal.structure.identifierINAF - Osservatorio Astrofisico di Arcetri [OAA]
dc.contributor.authorCASELLI, P.
hal.structure.identifierMax Planck Institute for Extraterrestrial Physics [MPE]
dc.contributor.authorCHACON-TANARRO, A.
hal.structure.identifierINAF - Osservatorio Astrofisico di Arcetri [OAA]
dc.contributor.authorCODELLA, C.
hal.structure.identifierHerzberg Institute of Astrophysics
dc.contributor.authorDI FRANCESCO, J.
hal.structure.identifierINAF - Osservatorio Astronomico di Brera [OAB]
dc.contributor.authorFONTANI, F.
hal.structure.identifierforeign laboratories [FL]
dc.contributor.authorHOGERHEIJDE, M.
hal.structure.identifierDépartement Langues et Culture Internationale [LCI]
dc.contributor.authorJOHANSEN, A.
hal.structure.identifierNatl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7 Canada
dc.contributor.authorJOHNSTONE, D.
dc.contributor.authorMADDISON, S.
hal.structure.identifierforeign laboratories [FL]
dc.contributor.authorPANIĆ, O.
hal.structure.identifierNational Radio Astronomy Observatory [Socorro] [NRAO]
dc.contributor.authorPÉREZ, L. M.
hal.structure.identifierINAF - Osservatorio Astrofisico di Arcetri [OAA]
dc.contributor.authorPODIO, L.
hal.structure.identifierMax Planck Institute for Extraterrestrial Physics [MPE]
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.authorVAN DER WIEL, M. H. D.
dc.contributor.authorVAN LANGEVELDE, H. J.
dc.contributor.authorVLEMMINGS, W.
dc.contributor.authorWALSH, C.
hal.structure.identifierCentre for Astronomy
dc.contributor.authorWILNER, D.
dc.date.issued2019
dc.identifier.issn0004-6361
dc.description.abstractEnObservations 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.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.title.enVLA 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
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201935340
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1909.03515
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A58
bordeaux.volume631
bordeaux.peerReviewedoui
hal.identifierhal-02282902
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02282902v1
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