Volume 444, Number 3, December IV 2005
|Page(s)||L57 - L60|
|Published online||05 December 2005|
Letter to the Editor
Spitzer's large CO2 ice detection toward the L723 class 0 object
Institut d'Astrophysique Spatiale, UMR 8617, Université Paris-Sud, bâtiment 121, 91405 Orsay, France e-mail: email@example.com
2 Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands
3 ESTEC, ESA, Research Support Science Department, PO Box 2200AZ, Noordwijk, The Netherlands
4 Centro de Astrobiologia, Spain
Accepted: 3 November 2005
The L723 low mass class 0 protostellar object has been observed with the IRS low resolution spectrometer onboard Spitzer Space Telescope. A huge CO2 ice column density of 6.3 ± 1 1018 cm-2 is detected toward this extremely red object. We constructed the spectral energy distribution (SED) of L723 by combining the Spitzer spectral data with Infrared Space Observatory (ISO) camera extracted fluxes, IRAS points, ISO long wavelength spectrometer (LWS) observations and millimeter ground based observations. A self consistent 1D model was developed to fit the SED. We show that, besides the high CO2 column density, the abundance ratio of CO2 ice to silicates grain cores is similar to other lines-of-sight.
Key words: astrochemistry / line: identification / ISM: dust, extinction / ISM: molecules / ISM: lines and bands / ISM: individual: L723
© ESO, 2005
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