TBA

Kontakt: Dr. Thorsten Battefeld

Kontakt: Dr. Thorsten Battefeld

Protoplanetary discs are a natural consequence of the star formation process and as such are ubiquitous around low-mass stars. They are fundamental to planet formation as they hold the reservoir of material from which planets form. Their evolution and final dispersal and the timescales that regulate these processes are therefore of particular interest. We have compared photometry data with a grid of radiative transfer models to show that the dispersal of discs is dominated by two timescales and that the final dispersal occurs quickly and from the inside out. X-ray photoevaporation from the central star provides a natural explanation to the observed double-timescale behaviour as well as being able to reproduce observed spectroscopic signatures of the wind. A new class of discs with large inner holes and strong accretion rates, believed to be objects in transition between the disc-bearing and disc-less status, pose however a new challenge to X-ray photoevaporation alone. We propose a mechanism based on the interaction between planet formation and photoevaporation that may be able to explain the origin of these discs. By means of 2D Fargo simulations we show that Planet Formation Induced Photoevaporation (PIPE, see Figure) is able to produce transition disc that for a given mass accretion rate have larger holes when compared to standard X-ray photoevaporation.

Kontakt: Dreizler

Kontakt: K.-H. Rehren

Kontakt: A. Pundt/C. Kuba

PROGRAMM:

10:00 Cynthia Volkert Chasing Dislocations in Nanoscale Metals

10:30 Guido Schmitz Beloved by Reiner: Elastic Stress in Atomic Transport

11:00 Ke Lu Materials with Nano-scale Twins

Coffee Break

11:50 Jürgen Eckert Metallic Glass – Structure, Properties and Perspectives

12:20 Joachim Mayer PICO and its Applications

12:50 Petros Sofronis Micromechanics of Hydrogen-Induced Fracture: From Experiments and Modeling to Prognosis

Lunch Break

14:00 Ludwig Schultz High Temperature Superconductors for Magnetic Levitation – The SupraTrans Test Facility

14:30 Peter Gumbsch 3D Experimental Analysis and Simulation of Grain Growth During Sintering 15:00 Jörg Neugebauer Hydrogen Embrittlement of Metals: Novel Approaches to an Old Problem

Coffee Break

15:50 Hamish Fraser Aberration-corrected Electron Microscopy Studies of Phase Transformations in Ti and Ni-base Superalloys

16:20 Günter Gottstein Properties of Solitary and Connected Grain Boundaries

16:50 Dierk Raabe From Defactant Theory to the Atomic-scale Manipulation

Kontakt: C. Borchers/C. Kuba

Kontakt: B. Damaschke

Kontakt: K.-H. Rehren