Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...88b&link_type=abstract
XMM-Newton Proposal ID #06523304
Physics
Stars, White Dwarfs, Solar System, Eg Cha, Lkca 19, Twa 7, Twa 2
Scientific paper
High energy (X-ray+UV) radiation from young stars profoundly influences physical and chemical processes in their circumstellar environment.Gas and dust in protoplanetary systems are excited by these photons, which are the dominant ionization source for hundreds AU around the star. X-rays penetrate deep into disks and power complex chemistry on grain surfaces. We propose RGS+EPIC observations of 4 weak-lined T Tauri stars that anchor the non-accreting end of our 111 orbit HST Large Project to observe the UV spectra of a carefully chosen sample of 32 young stars with COS and STIS. Modeling the effects of high energy radiation requires BOTH UV and X-ray spectra. Without RGS observations our analysis of the HST spectra for these four more-evolved (5-9 Myr old) stars will be severely hindered.
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