EPoS Contribution
EPoS Contribution
Accretion and Outflows in Young Stars: an Interdisciplinary Approach for a Multi-Band Investigation

Rosaria Bonito
INAF-OAPa, Palermo, IT
The investigation of the properties of multi-band emission from the complex systems of young stars with disks, including their components, e.g. accretion shocks and bipolar jets can be important in the context of formation of stars and exo-planetary systems. However, several open issues are still largely debated and need to be addressed in this context to achieve a more complete description of such a complex system. We are exploring the advantage of an inter-disciplinary approach to combine multi-wavelength observations, magnetohydrodynamical models, and laboratory experiments of accretion/ejection process in young stars (published as co-authors on Science and Science Advances). In the high energy band (UV, X-rays) we are pushing to the limit the capabilities of the currently available instruments to compare high energy observations (e.g. performed with Chandra) with magnetohydrodynamical models predictions of young stars, for example to investigate the possibility to measure the Doppler shift in the strongest lines. In the optical band, we are taking advantages of the data derived from big surveys available (e.g. the Gaia-ESO Survey, GES) to describe the accretion/ejection processes in a statistical way in young clusters, as the well studied case of NGC 2264, object of a multi-band campaign. Finally we present future perspectives, discussing how future missions (as Athena in X-rays) can be crucial to investigate in more details the properties of young stars. The future instrument LSST in the visible band will allow us to increase the number of young stars whose accretion/outflow activities can be fully characterized exploiting also the variability of these processes.
Caption: X-ray emission from an accretion shock in a young star as synthesized from MHD models: local absorption is taken into account in the central panel. Bottom panel: emitted spectrum in the energy range of the He-like O VII triplet and using the response function of the medium energy grating (MEG) of the Chandra satellite, with (red) and without (blue) the local absorption: this spectrum can be directly compared with astrophysical data (see inset: spectrum from the CTTS TW Hydrae observed by MEG/Chandra). From Revet, Chen, Bonito et al. 2017, Science Advances, 3, 11
Collaborators:
C. Argiroffi, UNIPA/INAF-OAPa, IT
S. Orlando, INAF-OAPa, IT
M. Miceli, UNIPA, INAF-OAPa, IT
L. Prisinzano, INAF-OAPa, IT
J. Fuchs, LULI, FR
Key publication

Suggested Session: Protostellar disks