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Issue A&A
Volume 444, Number 3, December IV 2005
Page(s) L57 - L60
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500211



A&A 444, L57-L60 (2005)
DOI: 10.1051/0004-6361:200500211

Letter

Spitzer's large CO $\mathsf{_2}$ ice detection toward the L723 class 0 object

E. Dartois1, K. Pontoppidan2, W.-F. Thi3 and G. M. Muñoz Caro4

1  Institut d'Astrophysique Spatiale, UMR 8617, Université Paris-Sud, bâtiment 121, 91405 Orsay, France
    e-mail: emmanuel.dartois@ias.u-psud.fr
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

(Received 15 August 2005 / Accepted 3 November 2005)

Abstract
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 $\pm$ 1 $\times$ 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

SIMBAD Objects



© ESO 2005


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