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26 April 2024 |
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Tracing High-Energy Radiation from T Tauri Stars Using Mid-Infrared Neon Emission from Disks | | C. Espaillat
; L. Ingleby
; E. Furlan
; M. McClure
; A. Spatzier
; J. Nieusma
; N. Calvet
; E. Bergin
; L. Hartmann
; J. M. Miller
; J. Muzerolle
; | | Date: |
10 Nov 2012 | | Abstract: | High-energy radiation from T Tauri stars (TTS) influences the amount and
longevity of gas in disks, thereby playing a crucial role in the creation of
gas giant planets. Here we probe the high-energy ionizing radiation from TTS
using high-resolution mid-infrared (MIR) Spitzer IRS Neon forbidden line
detections in a sample of disks from IC 348, NGC 2068, and Chamaeleon. We
report three new detections of [Ne III] from CS Cha, SZ Cha, and T 54, doubling
the 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-energy
radiation from TTS. The majority of previously inferred [Ne III]/[Ne II] ratios
based on [Ne III] line upper limits are significantly less than 1, pointing to
the dominance of either X-ray radiation or soft Extreme-Ultraviolet (EUV)
radiation in producing these lines. Here we report the first observational
evidence 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 EUV
emission from TTS, by suggesting that EUV radiation may dominate the creation
of Ne forbidden lines, albeit in a minority of cases. | | Source: | arXiv, 1211.2335 | | Services: | Forum | Review | PDF | Favorites | |
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