Forums

2016 May 11

Origins Forum - Potassium Isotopic Evidence for the Origin of the Moon - Kun Wang (EPS- Jacobsen Group)

4:00pm

Location: 

Haller Hall

Abstract - The Earth-Moon system has unique chemical and isotopic signatures compared to other planetary bodies; any successful model for the origin of the Earth-Moon system has to satisfy these chemical and isotopic constraints. The Moon is substantially depleted in volatile elements such as potassium compared to the Earth and the bulk solar composition, and it has long been thought to be the result of a catastrophic Moon-forming Giant Impact.

2015 Dec 16

Origins Forum - Bifacial Peptide and Polymer Nucleic Acid: Functional Integration of Abiotic Molecules with DNA and RNA (Dennis Bong- Ohio State University)

4:00pm

Location: 

Haller Hall

Abstract - We have recently reported the synthesis of bifacial peptide nucleic acid (bPNA), a peptide that uses triazine heterocycles to interface with polypyrimidines. Triazines readily form from prebiotic reaction conditions, raising the intriguing possibility of their role as informational precursors to the native bases. Bifacial PNA engages two oligo T/U strands simultaneously to form a unique triple stranded structure. Thus, bifacial PNA binding is an associative operation, bringing together non-interacting poly-T/U strands to form a bPNA triplex hybrid.

2015 Oct 21

Origins Forum - Observation of Chiral Sensitivity in an Electron-Collision-Induced Molecular Breakup Reaction (Timothy Gay - University of Nebraska)

4:00pm

Location: 

Haller Hall

Abstract: 

"We have bombarded chiral halocamphor molecules in the gas phase with low-energy (< 1 eV), longitudinally-spin-polarized electrons, and investigated dissociative electron attachment (DEA) reactions:       

e- + HA → H- + A,

2015 Sep 16

Origins Forum - The Compositions of Small Exoplanets (David Charbonneau)

4:00pm

Location: 

Haller Hall

The NASA Kepler Mission demonstrated that planets larger than Earth yet smaller than Neptune are a commonplace in the galaxy. Until recently, we knew nothing about their masses and, by inference, their compositions.  I report on what we've learned from the first 3 years of the HARPS-N survey, which aims to understand the transition from rocky planets, composed of rock and iron, to Neptune-like worlds, which have accreted an envelope of primordial H/He gas. I will explain the role of the NASA Transiting Exoplanet Survey Satellite (TESS), scheduled for launch in 2017.

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