Colloquia Schedule

Stephanie LaMassa (Yale University)

Dec. 4, 2014, 3:45 p.m. — LGRT 1033
Title: Discovering Rare AGN with the Stripe 82X X-ray Survey

Abstract: Supermassive black holes (SMBHs) grow by accreting matter in a phase where they are observed as active galactic nuclei (AGN). In order to track the evolution of rare objects, such as AGN at high luminosity, which signal when the majority of black hole growth occurred, a large volume of the Universe has to be explored through wide area surveys. Until recently, no large area X-ray survey has existed, meaning that a key phase in SMBH growth and SMBH/galaxy co-evolution is missing: luminous obscured SMBH growth. To rectify this gap, I have begun a wide area X-ray survey in the Sloan Digital Sky Survey region Stripe 82 which contains a veritable treasure trove of multi-wavelength coverage, expediting follow-up of identified X-ray sources. In this talk, I will review the highlights of our first release of "Stripe 82X" which covers ~16.5 deg^2 with ~3300 X-ray sources identified. I will discuss our current ground-based follow-up campaigns to target interesting classes of AGN and will comment on what we expect to learn with the addition of 20 deg^2 awarded to our team in the current XMM-Newton observing cycle.

Kaitlin Kratter (University of Arizona)

Dec. 11, 2014, 3:45 p.m. — LGRT 1033
Title: What can we learn from planets in binary systems?

Abstract: Exoplanet surveys have revealed a surprising array of planetary systems hosted by binary stars. The diversity and architecture of these systems provide insight into the fundamentals of planet formation for a wide range of systems. Moreover, these planets provide an important final boundary condition for our models of star formation, and especially binary formation. I will review the statistics of these surprisingly un-exotic systems, describe the theoretical implications, and discuss the prospects for progress with observational facilities of the future.