Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.364l..47g&link_type=abstract
Monthly Notices of the Royal Astronomical Society: Letters, Volume 364, Issue 1, pp. L47-L50.
Astronomy and Astrophysics
Astronomy
5
Circumstellar Matter, Planetary Systems: Formation, Planetary Systems: Protoplanetary Discs
Scientific paper
Gas discs around young stars typically disappear after a few Myr and it has been suggested that the discs are internally photoevaporated, but the stellar ultraviolet and X-ray radiation appears insufficient for this mechanism to work. Archival data are used to search for any relation between X-ray luminosity and gas in the disc (traced by 13CO molecules) for isolated young stars in Taurus. A significant correlation is found in that more irradiation increases the amount of 13CO, rather than dispersing the disc. Since high dust masses and accretion rates do not boost the X-ray luminosities, feeding of the radiation by the disc can be ruled out. It is more plausible that energetic photons are releasing molecules that would otherwise be frozen onto dust grains. In this case, estimates of disc mass using a canonical CO:H2 ratio are unrealistic. However, the mass released in CO molecules could contribute to building a belt of icy comets similar to the Sun's Kuiper Belt.
No associations
LandOfFree
Molecular gas in irradiated protoplanetary discs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Molecular gas in irradiated protoplanetary discs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular gas in irradiated protoplanetary discs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1635108