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Detection of CO+ with ISO towards the protostar IRAS16293-242

Ceccarelli, C.; Caux, E.; Wolfire, M.; Rudolph, A.; Nisini, B.; Saraceno, P. and White, G. J. (1997). Detection of CO+ with ISO towards the protostar IRAS16293-242. In: The First ISO Workshop on Analytical Spectroscopy, 6-8 Oct 1997, Madrid, Spain, p. 43.

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We observed the low luminosity (and low mass) protostar IRAS16293-2422 with the Long Wavelength Spectrometer on board the Infrared Space Observatory. The observed line spectrum is very reach and shows transitions of several molecules and atoms. Here we report the detection of eight high-N rotational transitions of CO+. 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 was not predicted 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 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.

Item Type: Conference or Workshop Item
Copyright Holders: 1997 European Space Agency
Extra Information: Proceedings of the First ISO Worskhop on Analytical Spectroscopy
6-8 October 1997
(ESA SP-419, December 1997)
Keywords: jets and outflows; star formation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
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Item ID: 32697
Depositing User: G. J. White
Date Deposited: 22 Mar 2012 10:27
Last Modified: 09 Dec 2018 21:53
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