Thunch (Room 33)
Talks happen in Peyton 33, Thursdays at 12:15. They are rather informal, so leave time for questions throughout. Talks are at most ~50 minutes, including questions.
Most importantly, attendees are supposed to eat lunch throughout the talk! From this old tradition comes the name.
Thursday, Feb 8
Yuan-Sen Ting, Princeton University
The new era of Galactic Archaeology
Understanding physical processes responsible for the formation and evolution of galaxies like the Milky Way is a fundamental problem. However, a key challenge is that the properties and orbits of the stars can only be observed at present: to understand what happened in the Milky Way at earlier epochs, one must explore "archaeological" techniques. I will discuss the opportunities associated with Galactic archaeology with the on-going large scale multiplexing spectroscopic surveys, including a first quantitative constraint on the radial migration of stars and on the disrupted cluster mass function in the Milky Way. I will also describe a new set of tools for efficient measuring > 20 elemental abundances from low-resolution R=2000 spectra, for discovering spectroscopically unresolved binaries, and for inferring asteroseismic parameters directly from single-epoch spectra.
Thursday, Feb 15:
Steve Choi, Princeton University
Precision Cosmology with Advanced ACTPol
The Advanced ACTPol upgrade on the Atacama Cosmology Telescope aims to improve the measurement of the cosmic microwave background anisotropies and polarization, using four new dichroic detector arrays fabricated on 150-mm silicon wafers. In 2016, the Atacama Cosmology Telescope began mapping approximately half the sky with increased sensitivity using these new detector arrays. I will discuss the performance of the Advanced ACTPol upgrade and the improved constraints on cosmology.
Feb 22: Cole Holcomb, Princeton University
Mar 1: Edo Berger, Harvard
Mar 15: Joshua Wallace, Princeton University
May 10: Kris Pardo, Princeton University
May 31: John Stocke, University of Colorado Boulder