Probing X-ray Irradiated Protoplanetary Disks

Details Probing X-ray Irradiated Protoplanetary Disks Probing X-ray Irradiated Protoplanetary Disks

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7502m&link_type=abstract

American Astronomical Society Meeting 210, #75.02; Bulletin of the American Astronomical Society, Vol. 39, p.181

Astronomy and Astrophysics

Astronomy

Scientific paper

Strong X-ray emission has been observed from low-mass young stellar objects. The X-rays interact with the upper layers of the surrounding protoplanetary disk, where they are expected to dominate the thermal and chemical balance. We investigate whether there are specific diagnostics for the effects of X-rays on the properties of the gas using an updated version of the model presented earlier by Glassgold, Najita & Igea (2004). We extend recent work by Glassgold, Najita & Igea (2007) which predicts strong [NeII] 12.81 micron emission by X-ray irradiated disks. We find a near-linear correlation between the neon fine-structure line emission and the X-ray luminosity, which is consistent with the observations of this line by SPITZER (Pascucci et al. 2007, ApJ in press). We also make predictions of the observability of the forbidden and fine-structure lines of CI, CII, OI, SI and SII. We will discuss the spatial distribution of the emissivity of these lines as a function of position in the disk and compare the regions of the disk that they probe.

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