• DOI:10.1086/509042
• Corpus ID: 14291795

Spitzer 24 μm Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars

@article{Siegler2007Spitzer2,
  title={Spitzer 24 $\mu$m Observations of Open Cluster IC 2391 and Debris Disk Evolution of FGK Stars},
  author={Nick Siegler and J Muzerolle and Erick T. Young and George H. Rieke and Eric E. Mamajek and David E. Trilling and Nadya I. Gorlova and Kate Y. L. Su Steward Observatory and University of Arizona and Harvard--Smithsonian Center for Astrophysics},
  journal={The Astrophysical Journal},
  year={2007},
  volume={654},
  pages={580-594}
}

• N. Siegler, J. Muzerolle, +7 authors H. F. Astrophysics
• Published 6 September 2006
• Physics, Geology
• The Astrophysical Journal

We present 24 � m Spitzer MIPS photometric observations of the � 50 Myr open cluster IC 2391. Thirty-four cluster members ranging in spectral type from B3 to M5 were observed in the central square degree of the cluster. Excesses indicative of debris disks were discovered around one A star, six FGK stars, and possibly one M dwarf. For the cluster members observed to their photospheric limit, we find a debris disk frequency of 10 þ17 � 3 % for B‐A stars and 31 þ13 � 9 % for FGK stars using a 15% relative excess threshold. Relative to a model of decaying excess frequency, thefrequencyofdebrisdisksaroundA-typestarsappearsmarginallylowforthecluster’sagewhilethatof FGKstars appears consistent. Scenarios that may qualitatively explain this result are examined. We conclude that planetesimal activity in the terrestrial region of FGK stars is common in thefirst � 50 Myr and decays on timescales of � 100 Myr. Despite luminosity differences, debris disk evolution does not appear to depend strongly on stellar mass. Subject headingg infrared: stars — open clusters and associations: individual (IC 2391) — planetary systems: protoplanetary disks