Accretion and Outflow-Related X-Rays in T Tauri Stars
M. Guedel, K. Briggs, K. Arzner, M. Audard, J. Bouvier, C. Dougados,, E. Feigelson, E. Franciosini, A. Glauser, N. Grosso, S. Guieu, F. Menard, G., Micela, J.-L. Monin, T. Montmerle, D. Padgett, F. Palla, I. Pillitteri, T., Preibisch, L. Rebull, L. Scelsi, B. Silva, S. Skinner
TL;DR
This study investigates X-ray emissions in T Tauri stars, revealing accretion shocks, a soft excess, and a new jet-related X-ray source, advancing understanding of star formation processes.
Contribution
It provides new observational evidence of accretion shocks and jet-related X-ray sources in T Tauri stars, highlighting the role of dust depletion and complex absorption.
Findings
Detection of a soft X-ray excess in accreting T Tauri stars.
Identification of a new jet-related X-ray component with strong absorption.
Evidence of dust depletion in accretion streams from X-ray absorption patterns.
Abstract
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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