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High-energy radiation from T Tauri stars (TTS) influences the amount andlongevity of gas in disks, thereby playing a crucial role in the creation ofgas giant planets. Here we probe the high-energy ionizing radiation from TTSusing high-resolution mid-infrared (MIR) Spitzer IRS Neon forbidden linedetections in a sample of disks from IC 348, NGC 2068, and Chamaeleon. Wereport three new detections of [Ne III] from CS Cha, SZ Cha, and T 54, doublingthe known number of [Ne III] detections from TTS. Using [Ne III]-to-[Ne II]ratios in conjunction with X-ray emission measurements, we probe high-energyradiation from TTS. The majority of previously inferred [Ne III]/[Ne II] ratiosbased on [Ne III] line upper limits are significantly less than 1, pointing tothe dominance of either X-ray radiation or soft Extreme-Ultraviolet (EUV)radiation in producing these lines. Here we report the first observationalevidence for hard EUV dominated Ne forbidden line production in a T Tauri disk:[Ne III]/[Ne II]~1 in SZ Cha. Our results provide a unique insight into the EUVemission from TTS, by suggesting that EUV radiation may dominate the creationof Ne forbidden lines, albeit in a minority of cases.

Tracing High-Energy Radiation from T Tauri Stars Using Mid-Infrared Neon Emission from Disks