Results and Perspectives of Young Stellar Object long look programs

TL;DR

This paper reviews recent X-ray observational results on Young Stellar Objects (YSOs), focusing on emission mechanisms, magnetic interactions, and disk effects, highlighting new evidence and future research directions.

Contribution

It presents new observational evidence challenging standard models of YSO X-ray emission and discusses the implications for understanding star-disk interactions.

Findings

Challenged the standard interpretation of Fe 6.4 keV line origin.

Detected X-ray excited Ne 12.81 micron line indicating disk interaction.

Provided evidence for magnetic funnels connecting YSO and disk.

Abstract

Both Chandra and XMM-Newton have performed long look programs for studying the YSO physics. I will discuss recent results on the controversial issue of Class 0 YSO X-ray emission, the observational evidence of magnetic funnels interconnecting the YSO with its circumstellar disk and the Fe 6.4 keV fluorescent line emission and its origin. While recent results of the XMM-Newton DROXO program challenge the ''standard'' interpretation of the Fe 6.4 line origin as due to photoionized fluorescing disk material, the discovery of X-ray excited Ne 12.81 micron line is a clear evidence of the interaction between X-rays and disk material. Future long look observations with XMM-Newton are required to clarify the X-ray effects on YSO disk.