Disk evolution in ob associations: Deep Spitzer/IRAC observations of IC 1795

Veronica Roccatagliata, Jeroen Bouwman, Thomas Henning, Mario Gennaro, Eric Feigelson, Jinyoung Serena Kim, Aurora Sicilia-Aguilar, Warrick A. Lawson

Research output: Contribution to journalArticle

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Abstract

We present a deep Spitzer/Infrared Array Camera (IRAC) survey of the OB association IC 1795 carried out to investigate the evolution of protoplanetary disks in regions of massive star formation. Combining Spitzer/IRAC data with Chandra/Advanced CCD Imaging Spectrometer observations, we find 289 cluster members. An additional 340 sources with an infrared excess, but without X-ray counterpart, are classified as cluster member candidates. Both surveys are complete down to stellar masses of about 1 M. We present pre-main-sequence isochrones computed for the first time in the Spitzer/IRAC colors. The age of the cluster, determined via the location of the Class III sources in the [3.6]-[4.5]/[3.6] color-magnitude diagram, is in the range of 3-5Myr. As theoretically expected, we do not find any systematic variation in the spatial distribution of disks within 0.6 pc of either O-type star in the association. However, the disk fraction in IC 1795 does depend on the stellar mass: sources with masses >2 M have a disk fraction of ∼ 20%, while lower mass objects (2-0.8 M) have a disk fraction of ∼ 50%. This implies that disks around massive stars have a shorter dissipation timescale.

Original languageEnglish (US)
Article number113
JournalAstrophysical Journal
Volume733
Issue number2
DOIs
StatePublished - Jun 1 2011

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cameras
stellar mass
massive stars
protoplanetary disks
color-magnitude diagram
imaging spectrometers
dissipation
spectrometer
diagram
star formation
spatial distribution
charge coupled devices
timescale
color
stars
x rays

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Roccatagliata, V., Bouwman, J., Henning, T., Gennaro, M., Feigelson, E., Kim, J. S., ... Lawson, W. A. (2011). Disk evolution in ob associations: Deep Spitzer/IRAC observations of IC 1795. Astrophysical Journal, 733(2), [113]. https://doi.org/10.1088/0004-637X/733/2/113
Roccatagliata, Veronica ; Bouwman, Jeroen ; Henning, Thomas ; Gennaro, Mario ; Feigelson, Eric ; Kim, Jinyoung Serena ; Sicilia-Aguilar, Aurora ; Lawson, Warrick A. / Disk evolution in ob associations : Deep Spitzer/IRAC observations of IC 1795. In: Astrophysical Journal. 2011 ; Vol. 733, No. 2.
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Roccatagliata, V, Bouwman, J, Henning, T, Gennaro, M, Feigelson, E, Kim, JS, Sicilia-Aguilar, A & Lawson, WA 2011, 'Disk evolution in ob associations: Deep Spitzer/IRAC observations of IC 1795', Astrophysical Journal, vol. 733, no. 2, 113. https://doi.org/10.1088/0004-637X/733/2/113

Disk evolution in ob associations : Deep Spitzer/IRAC observations of IC 1795. / Roccatagliata, Veronica; Bouwman, Jeroen; Henning, Thomas; Gennaro, Mario; Feigelson, Eric; Kim, Jinyoung Serena; Sicilia-Aguilar, Aurora; Lawson, Warrick A.

In: Astrophysical Journal, Vol. 733, No. 2, 113, 01.06.2011.

Research output: Contribution to journalArticle

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AU - Kim, Jinyoung Serena

AU - Sicilia-Aguilar, Aurora

AU - Lawson, Warrick A.

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