JETSET FP6, "Jet Simulations, Experiments, Theory" 10 years later, what is next?

Session

S5 Simulations

23 mai 2018, 14:00

Salle de conférence du château (Meudon)

8. Jet launching simulations

Christian Fendt (Max Planck Institute for Astronomy)

23/05/2018 14:00

I 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.

1. Modeling the accretion on Young Stars : recent results and perspectives

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 14:30

Many 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...

12. Radiation magnetohydrodynamic models and spectral signatures of plasma flows accreting onto Classical T Tauri Stars

M. Salvatore Colombo (Università di Palermo, Pierre et Marie Curie University, INAF - Istituto Nazionale di Astrofisica)

23/05/2018 15:00

CTTSs 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...

28. Simulating accretion and outflow regions in YSOs

Raquel Albuquerque

24/05/2018 09:30

One 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...

18. Seeking for magnetic fields through ALMA polarimetric studies of rotating jet/disk systems

Dr Francesca Bacciotti (INAF - Osservatorio Astrofisico di Arcetri)

24/05/2018 10:00

We 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...

15. Constraining the structure of X-ray emitting jets close to the launching site

Mlle Sabina Ustamujic (Universidad Complutense de Madrid)

24/05/2018 10:30

Observations 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...

20. Precessing Jets in Supernovae Shells

M. Dimitrios Millas (KU LEUVEN)

24/05/2018 11:30

Supernovae (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...

31. Internal chocs in stratified relativistic jets

Dr ZAKARIA MELIANI (LUTH, Observatoire de Paris)

24/05/2018 12:00

We 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...

33. Modeling the spin evolution of classical TTauri stars

Claudio Zanni (INAF - Osservatorio Astrofisico di Torino)

24/05/2018 12:30

The 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...