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DTSTART:20001029T020000
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BEGIN:VEVENT
UID:Baylor_CMS_Event-62661
DTSTAMP:20091121T194928Z
SUMMARY:CASPER Seminar: John Lacy,Department of Astronomy, UT Austin:"Observations of Modeling Infrared Spectra of Protoplanetary Disks"
DESCRIPTION;ENCODING=QUOTED-PRINTABLE:Conservations of angular momentum during the collapse of a molecular=0D=0A=
cloud to form a star results in an orbiting disk of gas and dust, out=0D=0A=
of which planets can form.  Infrared emission from the dust in such=0D=0A=
disks has been well studied, especially by observations with the=0D=0A=
Spitzer Space Telescope.  These observations show evidence for grain=0D=0A=
processing and settling, which must precede planet formation.=0D=0A=
Gas, although amounting to about 99% of the mass of disks, is more=0D=0A=
difficult to study.  However, several molecules, including H2, CO, H2O,=0D=0A=
CH4, C2H2, HCN, and NH3, have now been observed, and radiative transfer=0D=0A=
models are being constructed to interpret their spectra.  I will=0D=0A=
describe some of these observations and models.  A notable conclusion=0D=0A=
from the modeling is that dust settling, implied by the Spitzer spectra,=0D=0A=
also appears to be necessary to explain the strengths of the molecular=0D=0A=
emission features.
LOCATION:BSB C.206
DTSTART;TZID=US_Central:20091120T140000
DTEND;TZID=US_Central:20091120T150000
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