Two populations of transition discs?
Version of Record online: 7 SEP 2012
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Monthly Notices of the Royal Astronomical Society: Letters
Volume 426, Issue 1, pages L96–L100, October 2012
How to Cite
Owen, J. E. and Clarke, C. J. (2012), Two populations of transition discs?. Monthly Notices of the Royal Astronomical Society: Letters, 426: L96–L100. doi: 10.1111/j.1745-3933.2012.01334.x
- Issue online: 1 OCT 2012
- Version of Record online: 7 SEP 2012
- Accepted 2012 August 13. Received 2012 July 30; in original form 2012 May 24
- protoplanetary discs;
- planetary systems;
- stars: pre-main-sequence
We examine the distribution of transition discs as a function of millimetre (mm) flux. We confirm that as expected in any model in which most primordial discs turn into transition discs and in which mm flux declines with time, transition discs have lower mm fluxes on average than primordial discs. However, we find that the incidence of transition discs does not, as expected, fall monotonically towards large mm fluxes and also investigate the hypothesis that these mm bright transition discs may have a distinct physical origin. We find that mm bright transition discs occupy a separate region of parameter space. Transition discs in the bright mm subsample have systematically higher accretion rates than those in the faint mm subsample, along with being systematically weighted to earlier spectral types.