Letter to the Editor
Spitzer's large CO2 ice detection toward the L723 class 0 object
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
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