Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.223l&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
The Spitzer-IRS detection of highly abundant hot (Tex>400 K) molecular gas toward the low-mass star IRS 46 (Lahuis et al. 2006) was cause for great excitement. Strong absorption bands of gas-phase C_2H_2, HCN and CO_2 provided the first observational test of chemical models in the planet-forming zone of a circumstellar disk as well as a direct measure of the temperature and density in this zone. Subsequently, the same molecules have been observed in absorption toward the young star GV Tau (Gibb et al. 2007) and in emission (together with hot abundant H_2O and OH) toward a number of T Tauri stars (Carr & Najita 2008, Salyk et al. 2008, Pontoppidan et al. 2010). Follow-up Spitzer-IRS observations of IRS 46 at 5 epochs taken during 2008 and 2009 show dramatic changes of the mid-IR properties. The mid-IR continuum and the strength of hot water emission lines (detected in the newly reduced data) have increased (up to a factor of two) while the above mentioned absorption features have decreased (up to a factor of five) in strength (see figure below). At the same time GV Tau does not show any significant changes in flux or the strength of its molecular absorption bands. Starting with the parameters of the SED model as presented by Lahuis et al. (2006), we use the proptoplanetary disk model ProDiMo (Woitke et al. 2009, Kamp et al. 2010) to model the chemical composition of the inner few AU of the IRS 46 disk. In addition, the nature of the changes observed in the mid-IR spectra of IRS 46 are investigated using these models.
Kamp Inga
Lahuis Fred
Thi Wing-Fai
van Dishoeck Ewine F.
Woitke Peter
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