Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-24T03:51:43.427Z Has data issue: false hasContentIssue false
  • English
  • Français

Evolution of Young Stars and Their Disks in Serpens

Published online by Cambridge University Press:  21 October 2010

Isa Oliveira ,
Bruno Merín ,
Klaus Pontoppidan  and
Ewine van Dishoeck
Isa Oliveira
Affiliation:
Sterrewacht Leiden, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands email: [email protected]
Bruno Merín
Affiliation:
Herschel Science Center, European Space Agency (ESA), P.O. Box 78, 28691 Villanueva de la Cañada (Madrid), Spain
Klaus Pontoppidan
Affiliation:
California Institute of Technology, Division for Geological and Planetary Sciences, MS 150-21, Pasadena, CA 91125, USA
Ewine van Dishoeck
Affiliation:
Sterrewacht Leiden, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands email: [email protected] Max-Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Unbiased, flux-limited surveys of protoplanetary disks and their parent stars currently exist for only a few clouds, primarily Taurus and IC 348, selected primarily by optical and near-IR data. Such surveys are essential to address questions of disk evolution as a function of stellar parameters such as spectral type, age, accretion activity and environment. Using the ‘Cores to Disks’ (c2d) Spitzer Legacy Program, we discovered a new population of young stellar objects (YSOs) in a region of only 0.8 deg2 in the Serpens Molecular Cloud. This sample contains 150 mid-IR bright (≥ 3 mJy at 8 μm) YSOs with infrared excess, having a broad range of SED types and luminosities. Serpens is therefore a unique target region for obtaining a complete, well-defined sample of multi-wavelength observations of young stars in a possible evolutionary sequence. Compared with other clouds such as Taurus and Chamaeleon, Serpens has an exceptionally high star-formation rate (5.7 × 10−5 M⊙ yr−1). Follow-up complimentary observations in the optical, near- and mid-infrared (Spitzer/IRS GO3) have allowed us to characterize both the central stars and the surrounding disks. The shape and slope of the mid-infrared excess provide information on the flaring geometry of the disks. The spectral features give constraints on grain growth and mineralogy, which in turn probes heating and radial mixing. The presence of PAH features traces UV radiation, whereas Hα and Brγ are used as diagnostics of accretion. Assuming that all stars within a sufficiently small region are nearly coeval, this provides direct constraints on the importance of environment and initial conditions on disk evolution. In this meeting, we have presented our latest results on this rich populations of YSOs, as detailed in Oliveira et al. (2009, 2010). We have discussed connections between the evolution of the disks and that of their harboring stars, and the processes that determine the evolutionary sequence of protoplanetary disks.

Keywords

stars: pre–main sequence – stars: planetary systems: protoplanetary disks
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 731
Copyright
Copyright © International Astronomical Union 2010

References

Furlan, E. et al. 2006, ApJS 165, 568CrossRefGoogle Scholar
Furlan, E. et al. 2008, ApJS 176, 184CrossRefGoogle Scholar
Harvey, P. et al. 2007, ApJ 663, 1149Google Scholar
Kessler-Silacci, J. et al. 2006, ApJ 639, 275Google Scholar
Oliveira, I. et al. 2009, ApJ 691, 672; and in prep.CrossRefGoogle Scholar
Oliveira, I. et al. in prep.Google Scholar
Olofsson, J. et al. A&A acceptedGoogle Scholar