Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks

Details Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks

2006-11-02

arxiv.org/abs/astro-ph/0611094v1

Astrophys.J.656:515-523,2007

Astronomy and Astrophysics

Astrophysics

24 pages, 5 figures

Scientific paper

10.1086/510013

Using a thermal-chemical model for the generic T-Tauri disk of D'Alessio et al. (1999), we estimate the strength of the fine-structure emission lines of NeII and NeIII at 12.81 and 15.55 microns that arise from the warm atmosphere of the disk exposed to hard stellar X-rays. The Ne ions are produced by the absorption of keV X-rays from the K shell of neutral Ne, followed by the Auger ejection of several additional electrons. The recombination cascade of the Ne ions is slow because of weak charge transfer with atomic hydrogen in the case of Ne2+ and by essentially no charge transfer for Ne+. For a distance of 140pc, the 12.81 micron line of Ne II has a flux of 1e-14 erg/cm2s, which should be observable with the Spitzer Infrared Spectrometer and suitable ground based instrumentation. The detection of these fine-structure lines would clearly demonstrate the effects of X-rays on the physical and chemical properties of the disks of young stellar objects and provide a diagnostic of the warm gas in protoplanetary disk atmospheres. They would complement the observed H2 and CO emission by probing vertical heights above the molecular transition layer and larger radial distances that include the location of terrestrial and giant planets.

Affiliated with

Also associated with

No associations

Rating

Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neon Fine-Structure Line Emission By X-ray Irradiated Protoplanetary Disks will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-163069