Protoplanetary and Transitional Disks in the Open Stellar Cluster IC 2395
| Autor: | George H. Rieke, Cameron P. M. Bell, Nick Siegler, Erick T. Young, Andras Gaspar, Jozsef Vinko, Zoltan Balog, Kate Y. L. Su, Robert A. Gutermuth, James Muzerolle, László L. Kiss |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
ComputingMilieux_THECOMPUTINGPROFESSION 010504 meteorology & atmospheric sciences Foundation (engineering) Astronomy FOS: Physical sciences ComputerApplications_COMPUTERSINOTHERSYSTEMS Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences ComputingMilieux_COMPUTERSANDEDUCATION Cluster (physics) 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1609.05798 |
| Popis: | We present new deep UBVRI images and high-resolution multi-object optical spectroscopy of the young (~ 6 - 10 Myr old), relatively nearby (800 pc) open cluster IC 2395. We identify nearly 300 cluster members and use the photometry to estimate their spectral types, which extend from early B to middle M. We also present an infrared imaging survey of the central region using the IRAC and MIPS instruments on board the Spitzer Space Telescope, covering the wavelength range from 3.6 to 24 microns. Our infrared observations allow us to detect dust in circumstellar disks originating over a typical range of radii ~ 0.1 to ~ 10AU from the central star. We identify 18 Class II, 8 transitional disk, and 23 debris disk candidates, respectively 6.5%, 2.9%, and 8.3% of the cluster members with appropriate data. We apply the same criteria for transitional disk identification to 19 other stellar clusters and associations spanning ages from ~ 1 to ~ 18 Myr. We find that the number of disks in the transitional phase as a fraction of the total with strong 24 micron excesses ([8] - [24] > 1.5) increases from 8.4 +\- 1.3% at ~ 3 Myr to 46 +\- 5% at ~ 10 Myr. Alternative definitions of transitional disks will yield different percentages but should show the same trend. accepted by the Astrophysical Journal |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|