ISO Detection of CO(+) toward the Protostar IRAS 16293-2422

Details ISO Detection of CO(+) toward the Protostar IRAS 16293-2422 ISO Detection of CO(+) toward the Protostar IRAS 16293-2422

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...19112104r&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #121.04; Bulletin of the American Astronomical Society, Vol. 29, p.1404

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the detection of eight high-N rotational transitions of CO(+) towards a low mass protostar, IRAS 16293-2422. The source was observed with the Long Wavelength Spectrometer on board the Infrared Space Observatory. This is the first time that CO(+) has been detected in a low luminosity source and the first time that high-N lines have been detected in any source. The detection of these lines is totally unpredicted by models and, consequently, their interpretation is a challenge. We discuss the possibility that the observed CO(+) emission originates in the dense inner regions illuminated by the UV field created in the accretion shock (formed by the infalling material), and conclude that this is an improbable explanation. We have also considered the possibility that a strong, dissociative J-shock at ~ 500 AU from the star is the origin of the CO(+) emission. This model predicts CO(+) column densities in rough agreement with the observations if the magnetic field is ~ 1 mG and the shock velocity is 100 km s(-1) .

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