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The Universe in the Infrared

The Universe in the Infrared. Dusty Disks. Finding stars with planets using the Spitzer Infrared Telescope. Images courtesy NASA/JPL - Caltech. Funded by NASA’s Spitzer Science Center. Background Science. Rocky/icy “debris disk” remains after a star is formed

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The Universe in the Infrared

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  1. The Universe in the Infrared Dusty Disks Finding stars with planets using the Spitzer Infrared Telescope Images courtesy NASA/JPL - Caltech Funded by NASA’s Spitzer Science Center

  2. Background Science • Rocky/icy “debris disk” remains after a star is formed • Similar to our asteroid belt or Kuiper belt • Planets cause debris to collide • Dust! • Dust glows in the mid-infrared The Universe in the Infrared

  3. Hunting for Planets in IC 4665 • IC 4665 is a star cluster • hundreds of stars • distance of 352 pc • size about 5 pc • age 50-100 Myr The Universe in the Infrared

  4. Spitzer Observations of 9 Stars • Individual stars observed with Spitzer • 5’ x 5’ squares centered on target stars • visual and near-IR brightness measurements available from the literature The Universe in the Infrared

  5. Flux Density vs. Wavelength The Universe in the Infrared

  6. Black Body Curves The Universe in the Infrared

  7. Finding Planets in IC 4665 • Plot flux densities at B, V, I, J, H, K • Estimate 24,000 nm flux density by extrapolating black body curve • Measure 24,000 nm flux density from Spitzer images • Do any of the stars show excess flux at 24,000 nm? The Universe in the Infrared

  8. http://www.phys.vt.edu/~jhs/SIP/ on-line image processing Spitzer images on CD in the notebook Measuring fluxes The Universe in the Infrared

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