X-Ray and UV Photoion Ization and Photoexcitation of Pre-Main Star Transitional Disks

Details X-Ray and UV Photoion Ization and Photoexcitation of Pre-Main Star Transitional Disks X-Ray and UV Photoion Ization and Photoexcitation of Pre-Main Star Transitional Disks

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11336b&link_type=abstract

HST Proposal ID #11336. Cycle 16

Physics

Scientific paper

Transitional disks are one of the most crucial and important stages of the evolution of pre-main-sequence stars and protoplanetary systems. These disks have transformed most of the dust and gas in their inner regions into planetesimals and show clear inner ``holes'' that almost certainly harbor infant planetary systems. We propose to observe 3 young stars with transitional disks T Cha, GM Aur, LkHa 330 using ACIS-S to measure their X-ray radiation field and coronal emission properties and HST ACS-SBC to image the fluorescently excited molecular hydrogen in these systems to determine if the gas distribution follows the behavior seen in the dust distribution. [Only observations of GM Aur were approved. ]Our broader goal is to model the X-ray/UV photoionization and photoexcitation of the disks and study their photochemistry.;

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