PTYS/LPL Colloquium Schedule

Colloquia are held in Kuiper 308 or 312, beginning at 3:45 p.m. Refreshments at 3:30 p.m. in the Kuiper Atrium.

DATE EVENT TIME
Tuesday, Sep 2 LPL Colloquium:
Dr. Maitrayee Bose
Postdoctoral Research Fellow
Arizona State University

Presolar Minerals and Organics in Meteorites
Abstract:

The first part of the talk will be on presolar mineral grains formed in circumstellar environments and in supernova ejecta, incorporated into the molecular cloud from which our solar system originated, and identified in extraterrestrial materials. Laboratory studies of these grains provide nucleosynthetic and physical constraints on the processes occurring in stars. Presolar silicates that are the most abundant phase in the presolar grain inventory can also provide opportunities to investigate secondary processes taking place in the parent bodies in which they are found.

The second part of the talk will be on the study of organic materials, primarily the kerogen-like macromolecules, which can be an important source of prebiotic molecules essential to life on Earth. Although the location and exact mechanism for the production of large H and N isotopic anomalies associated with the insoluble macromolecules are still under debate, viable environments include low-temperature ion-molecule reactions in the gas phase and catalytic processes on dust grains either in the interstellar medium or outer protoplanetary disks. Possible relation between the complex chemistry that lead to the formation of meteoritic insoluble materials and the meteorite mineralogy is being assessed.

I will review what we have learned about and from presolar minerals and organics since the last decade.

Host: Tom Zega

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Sep 16 LPL Colloquium:
Dr. Isamu Matsuyama
Assistant Professor
U of A - Lunar and Planetary Laboratory

Tidal Dissipation in the Oceans of Icy Satellites
Abstract:
Dissipation of tidal energy is an important mechanism for the evolution of outer solar system satellites, several of which are likely to contain subsurface oceans. I will present a new theoretical treatment for ocean tidal dissipation that takes into account the effects of ocean loading, self-attraction, and deformation of the solid regions. These effects modify both the forcing potential and the ocean thicknesses for which energy dissipation is resonantly enhanced, potentially resulting in orders of magnitude changes in the dissipated energy flux. Assuming a Cassini state obliquity, Enceladus' dissipated energy flux due to the obliquity tide is smaller than the observed value by many orders of magnitude. On the other hand, the dissipated energy flux due to the resonant response to the eccentricity tide can be large enough to explain Enceladus' observed heat flow.

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Sep 23 LPL Colloquium:
Dr. Kaitlin Kratter
Assistant Professor
Steward Observatory

Host: Caitlin Griffith

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Sep 30 LPL Colloquium:
Dr. Mark Sykes
CEO & Director
Planetary Science Institute

Host: Roger Yelle

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Oct 7 LPL Colloquium:
Dr. Carol Paty
Associate Professor
Georgia Institute of Technology

Host: Walt Harris

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Oct 14 LPL Colloquium:
Dr. Leslie Rogers
Hubble Fellow
California Institute of Technology

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Oct 21 LPL Colloquium:
Dr. Jemma Davidson
Postdoctoral Associate
Carnegie Institution of Washington

Host: Dante Lauretta

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Oct 28 LPL Colloquium:
Dr. Michael Bland
Research Scientist
Washington University - St. Louis

Kuiper Space Sciences: Room 312
5:00 pm
Tuesday, Nov 4 LPL Colloquium:
Dr. Jani Radebaugh
Associate Professor
Brigham Young University

Host: Alfred McEwen

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Nov 18 LPL Colloquium:
Dr. Peter Brown
Professor
University of Western Ontario

Host: Tim Swindle

Kuiper Space Sciences: Room 312
3:45 pm
Tuesday, Dec 2 LPL Colloquium:
Dr. Heather Knutson
Assistant Professor
California Institute of Technology

Kuiper Space Sciences: Room 312
3:45 pm