X-raying circumstellar material around young stars

Abstract

Young stars are surrounded by copious amounts of circumstellar material. Its composition, in particular its gas-to-dust ratio, is an important parameter. However, measuring this ratio is challenging, because gas mass estimates are often model dependent. X-ray absorption is sensitive to the gas along the line-of-sight while optical/near-IR extinction depends on the dust content. Therefore, the gas-to-dust ratio of an absorber is given by the ratio between X-ray and optical/near-IR extinction. We present three systems where we used X-ray and optical/near-IR data to constrain the gas-to-dust ratio of circumstellar material; from a dust-rich debris disk to gaseous protoplanetary disks.

4 pages, 3 figures. To appear in "Young Stars and Planets Near the Sun", Proceedings of IAU Symposium No. 314 (Cambridge University Press), J.H. Kastner, B. Stelzer, S.A. Metchev, eds

References in corpus (7)

• On the age of the $\beta$ Pictoris moving group
• AA Tau's sudden and long-lasting deepening: enhanced extinction by its circumstellar disk
• A tidal encounter caught in the act: modelling a star-disc fly-by in the young RW Aurigae system
• The AU Microscopii Debris Disk: Multiwavelength Imaging and Modeling
• Occultation of the T Tauri Star RW Aurigae A by its Tidally Disrupted Disk
• A Low-Mass H2 Component to the AU Microscopii Circumstellar Disk
• Observation of enhanced X-ray emission from the CTTS AA Tau during a transit of an accretion funnel

Cited by in corpus (1)

• Sub-stellar Companions of Intermediate-mass Stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b