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The Universe in the Infrared

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Presentation on theme: "The Universe in the Infrared"— Presentation transcript:

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 The Universe in the Infrared
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 Pilachowski / August 2005

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 Myr The Universe in the Infrared Pilachowski / August 2005

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 Pilachowski / August 2005

5 Flux Density vs. Wavelength
Flux Density Measurements in mJy for IC 4665 Targets 2MASS Infrared Fluxes Waveband: B (blue) V (visual) I (near IR) J H K Wavelength (nm): 440 550 970 1235 1662 2159 Star ID Prosser 7 586 675 551 517 364 246 Prosser 11 839 882 615 571 385 252 Prosser 18 780 890 693 642 442 299 Prosser 37 217 257 207 189 136 89.9 Prosser 40 547 272 211 Prosser 45 1920 1970 1110 770 478 Prosser 46 1060 1080 732 622 387 274 Prosser 48 256 303 236 234 160 108 Prosser 54 398 438 332 294 203 143 Sources: BVI Photometry: Prosser, C. F. 1993, Astronomical Journal, 105, 1441 2MASS IR Photometry: This activity makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation ( The Universe in the Infrared Pilachowski / August 2005

6 The Universe in the Infrared
Black Body Curves The Universe in the Infrared Pilachowski / August 2005

7 The Universe in the Infrared
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 Pilachowski / August 2005

8 The Universe in the Infrared
Measuring fluxes on-line image processing Spitzer images on CD in the notebook The Universe in the Infrared Pilachowski / August 2005

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