Query : 2006A&A...451..723V

2006A&A...451..723V - Astronomy and Astrophysics, volume 451, 723-731 (2006/5-4)

Infrared spectroscopy of solid CO-CO2 mixtures and layers.


Abstract (from CDS):

The spectra of pure, mixed and layered CO and CO2 ices have been studied systematically under laboratory conditions using Transmission-Absorption Fourier Transform infrared spectroscopy. This work provides improved resolution spectra (0.5cm–1) of the CO2 bending and asymmetric stretching mode, as well as the CO stretching mode, extending the existing Leiden database (http://www.strw.leidenuniv.nl/~lab/databases/ ) of laboratory spectra to match the spectral resolution reached by modern telescopes and to support the interpretation of the most recent data from the Spitzer Space Telescope. It is shown that mixed and layered CO and CO2 ices exhibit very different spectral characteristics, which depend critically on thermal annealing and can be used to distinguish between mixed, layered and thermally annealed CO-CO2 ices. CO only affects the CO2 bending mode spectra in mixed ices below 50K under the current experimental conditions, where it exhibits a single asymmetric band profile in intimate mixtures. In all other ice morphologies the CO2 bending mode shows a double peaked profile, similar to that observed for pure solid CO2. Conversely, CO2 induces a blue-shift in the peak-position of the CO stretching vibration, to a maximum of 2142cm–1 in mixed ices, and 2140-2146cm–1 in layered ices. As such, the CO2 bending mode puts clear constraints on the ice morphology below 50K, whereas beyond this temperature the CO2 stretching vibration can distinguish between initially mixed and layered ices. This is illustrated for the low-mass young stellar object HH46, where the laboratory spectra are used to analyse the observed CO and CO2 band profiles and try to constrain the formation scenarios of CO2.

Abstract Copyright:

Journal keyword(s): astrochemistry - molecular data - methods: laboratory

CDS comments: Paragraph 4. SVS 4-9 is [EC89] SVS 4-9 in Simbad.

Simbad objects: 5

goto Full paper

goto View the references in ADS

Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 LDN 1489 DNe 04 04 47.5 +26 19 42           ~ 218 0
2 RAFGL 5163 Y*O 05 40 27.45024 -07 27 30.0564           ~ 135 1
3 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 313 1
4 HBC 650 TT* 16 34 29.32 -15 47 01.4           K3.0 174 2
5 2MASS J18295785+0112514 Y*O 18 29 57.858 +01 12 51.40           ~ 60 3

To bookmark this query, right click on this link: simbad:objects in 2006A&A...451..723V and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact