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Dr Gianluigi Bodo (INAF OATO)22/05/2018 09:55We present a numerical study of turbulence and dynamo action in stratified shearing boxes with zero mean magnetic flux. We assume that the fluid obeys the perfect gas law and has finite (constant) thermal diffusivity. We identify two regimes. The first is a conductive regime in which the heat is transported mostly by conduction and the density decreases with height. In the limit of large...Aller à la page de la contribution
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Prof. Nektarios Vlahakis (Department of Physics, University of Athens, Greece)22/05/2018 10:25The linear stability of magnetized jets against nonaxisymmetric modes will be discussed.Aller à la page de la contribution
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Prof. KANARIS TSINGANOS (UNIVERSITY OF ATHENS)22/05/2018 11:15A criterion is derived for distinguishing if a rotating hydrodynamic outflow emerging from the atmosphere and the gravitational well of a central object obtains a radial (wind) or cylindrical (jet) asymptotical shape. Quasi-analytical solutions are obtained via a nonlinear separation of the variables, which are the spherical distance and the mass flux function, in the relevant physical...Aller à la page de la contribution
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M. Loic Chantry (LUTH)22/05/2018 11:45The meridional self-similarity method was a very effective method in classical MHD to produce models describing the MHD flows of young stellar jets. But the jets produced by AGN are extremely energetic natural phenomena and thus constitute a real laboratory of higly reltivistic MHD flow and high energy physics. Indeed, it is well admitted that the fluid velocity of thes jets atteins higly...Aller à la page de la contribution
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Prof. Turlough Downes (Centre for Astrophysics and Relativity, Dublin City University)22/05/2018 12:15Diffusion of, and turbulence in, magnetic fields are believed to be critical to various processes in astrophysics such as particle acceleration, magnetic reconnection and star formation. It has been suggested that MHD turbulence itself can play a critical role in magnetic field diffusion. If this is true then it implies that some of our notions about global structures in turbulent...Aller à la page de la contribution
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Mme catherine dougados (ipag)22/05/2018 14:00Powerful atomic jets and molecular outflows are observed in young protostars at all stages of active accretion, from the young embedded Class 0 and Class 1 phases to the later optically revealed T Tauri or Class 2 phase. The origin of the ejection, its role in angular momentum extraction and impact on protoplanetary disk evolution remain as fundamental open questions in star formation. ...Aller à la page de la contribution
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Brunella Nisini (INAF Osservatorio di Roma)22/05/2018 14:30I will present a survey of forbidden line emission in a sample of 130 T Tauri stars in the Lupus, Chamaeleon and sigma Ori clouds conducted with the X-shooter instrument. The aim of the survey is to study the occurrence of high velocity jets and slow winds on a statistical bases, and investigate on the connection between the different mass loss phenomena and the source accretion properties.Aller à la page de la contribution
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Dr Dirk Froebrich (University of Kent)22/05/2018 15:00The talk will present the main results from the UK Wide-field Infrared survey for H2 (UWISH2).Aller à la page de la contribution
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Mme Fatima Lopez-Martinez (Instituto de Astrofísica e Ciências do Espaço)22/05/2018 15:30Winds and jets are key factors in the evolution of accretion disks in pre-main sequence stars, and deriving their physical properties is one of the most important steps for a full understanding of the connection among outflow, jet and accretion processes. In this work we determine the physical properties of the high velocity component (HVC) and the low velocity component (LVC) emitting region...Aller à la page de la contribution
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Prof. Tom Ray (Dublin Institute for Advanced Studies)22/05/2018 16:30The European Commission has made a large number of changes to the structure of innovative training networks (ITNs) in comparison to "The JETSET Era". Here I will look at these changes, explain the level of funding one might expect and what the budget will cover. I will also outline the differences, not always obvious, between the 3 main selection criteria of Excellence, Impact and...Aller à la page de la contribution
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Dr Ovidiu Tesileanu (ELI-NP, IFIN-HH, Romania)23/05/2018 09:45Extreme Light Infrastructure – Nuclear Physics (ELI-NP) is the Romanian pillar of the pan-European distributed research facility based on ultra-short-pulse lasers. Due to the unprecedented intensity regimes the 10PW lasers at ELI-NP can reach, and also to the combination of beams that can be synchronized and made available at the same time, new experiments relevant for the extreme conditions...Aller à la page de la contribution
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Jochen Eislöffel (Thüringer Landessternwarte)23/05/2018 10:45We will present new observations from accretion bursts from young stars.Aller à la page de la contribution
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Sylvie Cabrit23/05/2018 11:15The role of multiplicity and close stellar encounters in accretion and ejection bursts in young stars is a debated issue (Reipurth et al. 2014; Audard et al. 2014, and references therein). An interesting target of study in this context is SVS 13A, a 0.3'' (70 au) binary solar-type protostar (VLA4A,VLA4B; Anglada et al. 2000) with multiple signs of ejection bursts. SVS 13A is the candidate...Aller à la page de la contribution
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Dr Aris Tritsis (Research School of Astronomy and Astrophysics)23/05/2018 11:45Molecular clouds are the birthplaces of stars. Their structure and evolution hold the key to understanding the initial conditions of star and planet formation, and the physics that sets the distribution of masses and multiplicities of newborn stars. However, their complexity, their typically turbulent, filamentary, disordered appearance, and ubiquitous projection effects hinder all efforts to...Aller à la page de la contribution
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Christian Fendt (Max Planck Institute for Astronomy)23/05/2018 14:00I will present results of recent jet launching MHD simulations. These include simulations considering a dynamo-generated disk magnetic flux, and simulations in 3D thus considering jet launching in binary systems. I will also discuss a general interrelation between the disk magnetization and the jet dynamical parameters.Aller à la page de la contribution
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Lionel de Sa (LERMA, Sorbonne Université, Observatoire de Paris, Université PSL, CNRS, Paris, France & CEA/DSM/IRFU/SAp-AIM, CEA Saclay, CNRS, Gif-sur-Yvette, France)23/05/2018 14:30Many questions still remain open on the stellar accretion process which occurs during the first phases of the life of young stars and consequently the details in the exchange of mass and momentum between the proto-star and its accretion disk still remain approximate: the topology of the accretion flow, its temperature, its observability in the UV and X-ray bands, the possibility of any...Aller à la page de la contribution
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M. Salvatore Colombo (Università di Palermo, Pierre et Marie Curie University, INAF - Istituto Nazionale di Astrofisica)23/05/2018 15:00CTTSs are young stars accreting mass from their circumstellar disks. According to the largely accepted magnetospheric accretion scenario, the disk extends until the truncation radius, where the magnetic field is strong enough to disrupt the disk and to channel the material towards the star forming an accretion column. The material falls into the star at free fall velocity and hits the stellar...Aller à la page de la contribution
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Christophe Sauty23/05/2018 16:00
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Prof. Silvano Massaglia (University of Torino)23/05/2018 16:15
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Dr Vlahakis Nektarios (University of Athens)23/05/2018 16:30
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Dr Joao LIMA (University of Porto)23/05/2018 16:45
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Raquel Albuquerque24/05/2018 09:30One of the puzzling questions surrounding Young Stellar Objects (YSOs) concerns the unexpected evolution of their angular momentum. Theoretically, we should expect Classical T Tauri stars (CTTs) to rotate faster due to ongoing accretion and contraction processes towards the main-sequence. Apparently, that it is not observed. Many authors suggest that the interaction star-disk has an important...Aller à la page de la contribution
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Dr Francesca Bacciotti (INAF - Osservatorio Astrofisico di Arcetri)24/05/2018 10:00We have recently obtained ALMA Band 7 polarimetric data for the young systems DG Tau and CW Tau, for which the rotation properties of jet and disk have been investigated in previous high angular resolution studies. The motivation was to test the models of magneto-centrifugal launch of jets via the determination of the magnetic configuration at the disk surface. Non-spherical dust grains...Aller à la page de la contribution
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Mlle Sabina Ustamujic (Universidad Complutense de Madrid)24/05/2018 10:30Observations of stellar jets show evidence of X-ray emitting shocks close to the launching site. In some cases, including YSOs at different stages of evolution, the shocked features appear to be stationary (e.g. HH 154 and DG Tau). We study the case of HH 154, the jet originating from the embedded binary Class 0/I protostar IRS 5, and the case of the jet associated with DG Tau, a more evolved...Aller à la page de la contribution
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M. Dimitrios Millas (KU LEUVEN)24/05/2018 11:30Supernovae (SN) and astrophysical jets are two of the most energetic and intriguing objects in the universe. We examine an interesting scenario that involves the interaction of these two extreme phenomena, uniquely ''combined'' in the W50-SS433 system: a jet launched from the microquasar SS433 (an X-ray binary, XRB) located inside a supernova remnant (SNR), W50. Observations have revealed a...Aller à la page de la contribution
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Dr ZAKARIA MELIANI (LUTH, Observatoire de Paris)24/05/2018 12:00We investigate the plasmoid knot formation in stratified relativistic jet by means of relativistic magneto-hydrodynamics simulations. Indeed, astrophysical jets in active galactic nuclei seem to be transversely stratified, with a fast inner jet and a slower outer jet. As it is likely that the launching mechanism for each component is different. In the other hand, the steady and moving knots...Aller à la page de la contribution
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Claudio Zanni (INAF - Osservatorio Astrofisico di Torino)24/05/2018 12:30The spin evolution of classical TTauri stars (CTTS) represents a puzzling problem. Since they are still contracting and accreting, these protostars would be expected to spin-up at breakup speed in a few million years. On the other hand, as soon as they emerge from the Class 0-I embedded phases, they are observed to rotate with periods between 1-10 days, well below their breakup limit. In...Aller à la page de la contribution
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Rosaria Bonito (INAF - Osservatorio Astronomico di Palermo)24/05/2018 14:00High energy emission from young stars with disks, with all their components due to accretion and outflow activity, can have a deep impact on the evolution of their disks and on the formation of exo-planetary systems. An inter-disciplinary approach, which combines multi-wavelength observations, magnetohydrodynamical models, and laboratory experiments, allows us to get a more complete...Aller à la page de la contribution
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Dr Salvatore Orlando (INAF-Osservatorio Astronomico di Palermo)24/05/2018 14:30Accretion of matter is a process that plays a central role in the physics of young stellar objects. The analysis of the structure by which matter settles on the star can unveil key information about the process of star formation by providing details on mass accretion rates, stellar magnetic field configurations, possible effects of accretion on the stellar coronal activity, etc. Here we...Aller à la page de la contribution
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Dr Fabrizio Massi (INAF-Osservatorio Astrofisico di Arcetri)24/05/2018 15:00In this talk I will present the first results of our GIARPS survey of a sample of T-Tauri and Herbig AeBe stars ($\sim 100$ objects), belonging to the GRAVITY/VLTI GTO sample of Young Stellar Objects (YSOs). GIARPS is a broad-band spectrometer combining HARPS-N and GIANO which allows obtaining high-resolution spectra from 0.44 micron (R $\sim 115000$) to 2.44 micron (R $\sim$ 50000) in one...Aller à la page de la contribution
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Dr Odysseas Dionatos (University of Vienna)24/05/2018 15:30The conclusion of JETSET roughly coincided with the beginning of a new era when facilities such as Herschel and ALMA became operative, opening new observational possibilities in terms of sensitivity, angular and spectral resolutions. In this talk I will report on my continuing efforts to understand the role of jets and outflows in connection to their driving sources but also with respect to...Aller à la page de la contribution
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Andrea Ciardi
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Prof. Ana Gomez de Castro (Universidad Complutense)In this talk, we'll address the impact of UV radiation from the jet on the evolution of protoplanetary and young planetary disksAller à la page de la contribution
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