Accretion and Outflow-Related X-Rays in T Tauri Stars

Details Accretion and Outflow-Related X-Rays in T Tauri Stars Accretion and Outflow-Related X-Rays in T Tauri Stars

2007-11-13

arxiv.org/abs/0711.1970v1

Astronomy and Astrophysics

Astrophysics

8 pages, 9 figures, in press, Proc. IAUS 243, Star-Disk Interactions in Young Stars

Scientific paper

10.1017/S1743921307009519

We report on accretion- and outflow-related X-rays from T Tauri stars, based on results from the "XMM-Newton Extended Survey of the Taurus Molecular Cloud." X-rays potentially form in shocks of accretion streams near the stellar surface, although we hypothesize that direct interactions between the streams and magnetic coronae may occur as well. We report on the discovery of a "soft excess" in accreting T Tauri stars supporting these scenarios. We further discuss a new type of X-ray source in jet-driving T Tauri stars. It shows a strongly absorbed coronal component and a very soft, weakly absorbed component probably related to shocks in microjets. The excessive coronal absorption points to dust-depletion in the accretion streams.

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