Events at Physics
Events During the Week of October 24th through October 31st, 2010
- Plasma Physics (Physics/ECE/NE 922) Seminar
- "Pedestal Turbulence Dynamics in ELMing and ELM-free H-Mode Plasmas"
- Time: 12:05 pm
- Place: 2535 Engineering Hall
- Speaker: Zheng Yan, General Atomics
- Plasma Theory Seminar
- "Ion Gyroviscous Stabilization and Fluid Decoupling Effect on Tearing Fluctuations in Reversed Field Pinch Plasmas"
- Time: 4:00 pm
- Place: 514 ERB
- Speaker: Jake King, UW-Madison Dept of Engineering Physics
- Chaos & Complex Systems Seminar
- "Bat White-Nose Syndrom"
- Time: 12:05 pm
- Place: 4274 Chamberlin Hall
- Speaker: Andrea Gargas, Symbiology LLC
- No events scheduled
- Astronomy Colloquium
- "Recent results from the Cosmic Origins Spectrograph HD 209458b...."
- Time: 3:30 pm
- Place: 4421 Sterling Hall
- Speaker: Jeffrey Linsky, JILA, University of Colorado
- Abstract: 209458b was the first transiting planet to be studied in detail. <br>
It is a Jupiter mass exoplanet with a 3.5 day orbit around a solarlike star. We have used the new Cosmic Origins Spectrograph on Hubble to obtain very sensitive ultraviolet spectra during transit and three nontransit phases in order to measure the mass loss properties of the exoplanet. During transit, absorption by singly-ionized carbon and doubly-ionized silicon in the planet's exosphere reduces the observed stellar emission by 8% compared to the 1.5% reduction predicted by the planet's size. Velocity resolution of these line profiles leads to estimates of the mass loss rate and the identification of enhanced massloss directed away from the star. The planet has a cometlike tail!
I will also describe our preliminary analysis of molecular hydrogen pumping and fluorescence in the disks of premain sequence stars. The origin of the bright fluorescent emission seen in the ultraviolet spectra of these stars has been ascribed to pumping by the stellar Lyman-alpha emission line, but until now there has been no direct evidence for this pumping. The very sensitive COS instrument now allows us to observe absorption against the Lyman-alpha emission line at the pumping transitions. Energy balance between absorption and emission allows us to estimate the accretion rates for DF Tau and V4046 Sag.
- Graduate Introductory Seminar
- Astrophysics II: Experimental Astro/Space Physics
- Time: 5:30 pm
- Place: 2223 Chamberlin Hall
- Speaker: McCammon, Timbie
- Theory/Phenomenology Seminar
- New LHC Signals in the Context of Little Higgs Models
- Time: 2:30 pm
- Place: 5280 Chamberlin Hall
- Speaker: Pedro Schwaller, University of Illinois at Chicago
- Host: Vernon Barger