Evolution of Gas in Circumstellar Disks

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Evolution of Gas in Circumstellar Disks
Infrared Spectroscopy of Gas Species
Kristna Barkume Ay/Ge 132
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From Molecular Clouds to Planet-Forming Disks A
Spitzer Legacy Program
Spitzer Instruments IRAC Imager 4 colors
between 3.6-8 mm Images of the CO content IRS
5-40 mm spectrometer R600 H2, H20, CO2, solid
state silicates MIPS 23.5-155 mm multi-band
photometer
Other Instruments NIRSPEC (Keck II) 1-5.5 mm
R25,0000 CO (u 1-0) OVRO
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4.7 mm CO from L1489 IRS Boogert, Hogerheijde,
and Blake 2002
Key 13CO u C18O
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4.7 mm CO from L1489 IRS Boogert, Hogerheijde,
and Blake 2002
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Brittain, et al. 2003
AB Aurigae

• Herbig AeBe Star
• 2-4 Myr
• Strong Pfb emission
• IR Fluorescence

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Brittain, et al. 2003
HD 141569

• Herbig AeBe Star
• 5 Myr or greater
• No Pfb emission
• UV Pumped