The Search for Evidence of Episodic Mass Accretion: CO_2 features in low-luminosity, embedded protostars

Details The Search for Evidence of Episodic Mass Accretion: CO_2 features in low-luminosity, embedded protostars The Search for Evidence of Episodic Mass Accretion: CO_2 features in low-luminosity, embedded protostars

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.216k&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

3

Scientific paper

We present Spitzer IRS, SH mode spectroscopy toward 21 young stellar objects (YSOs) with luminosity lower than 1 L&sun; (4 with luminosity lower than 0.1 L&sun;). While the standard star formation model predicts protostars to have the luminosity higher than 1.6 L&sun; (Shu, 1977), Spitzer Legacy Project, From Molecular Cores to Planet Forming Disks (c2d; Evans et al.2003) survey shows that 59 % of the 112 embedded protostars have luminosity lower than 1.6 L&sun; (Evans et al 2009). One possible explanation is that the mass accretion is not a constant process. If accretion is episodic, the sources that currently have low luminosity may have had much higher accretion rates, and thus luminosities, in the past. In that case, imprints of the high luminosity stage in low luminosity YSOs would support the idea of episodic mass accretion. Evidence may be found in the 15.2 μm CO_2 ice features. The pure CO_2 ice can be formed only at elevated temperature and thus higher luminosity. Current internal luminosities of YSOs with L ≤ 1 L&sun; do not provide such conditions. We analyze 15.2 μm CO_2 ice bending mode absorption lines in comparison to the laboratory data. Preliminary analysis indicates that the low luminosity YSOs may harbor pure CO_2 ice components. A detailed analysis is ongoing and the result will be presented.

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