2007ApJ...656..515G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST02:39:21

2007ApJ...656..515G - Astrophys. J., 656, 515-523 (2007/February-2)

Neon fine-structure line emission by X-ray irradiated protoplanetary disks.

GLASSGOLD A.E., NAJITA J.R. and IGEA J.

Abstract (from CDS):

Using a thermal-chemical model for the generic T Tauri disk of D'Alessio and colleagues, we estimate the strength of the fine-structure emission lines of Ne II and Ne III at 12.81 and 15.55 µm 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 of the Ne ions is slow because of weak charge transfer with atomic hydrogen in the case of Ne+2 and by essentially no charge transfer for Ne+. For a distance of 140 pc, the 12.81 µm line of Ne II has a flux ∼10–14 ergs/cm2/s, 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 H2and CO emission by probing vertical heights above the molecular transition layer and larger radial distances that include the location of terrestrial and giant planets.

Abstract Copyright:

Journal keyword(s): Accretion, Accretion Disks - Infrared: Stars - Stars: Planetary Systems: Protoplanetary Disks - Stars: Formation - Stars: Pre-Main-Sequence - X-Rays: Stars

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2956 2
2 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 604 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2014 1
4 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1181 0
5 NAME Mon R2 HII 06 07 46.6 -06 22 59           ~ 655 2
6 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1555 1
7 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-02:39:22

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