189 citations · 770 across the 17 of their papers we have counts for
9 papers · 1 filter
Interstellar Heritage and the Birth Environment of the Solar System
Edwin A. Bergin, Conel Alexander, Maria Drozdovskaya +2
In this chapter, we explore the origins of cometary material and discuss the clues cometary composition provides in the context of the origin of our solar system. The review focuse…
Presolar Stardust in Highly Pristine CM Chondrites Asuka 12169 and Asuka 12236
Larry R. Nittler, Conel M. O'D. Alexander, Andrea Patzer +1
We report a NanoSIMS search for presolar grains in the CM chondrites Asuka (A) 12169 and A12236. We found 90 presolar O-rich grains and 25 SiC grains in A12169, giving matrix-norma…
The effects of atmospheric entry heating on organic matter in interplanetary dust particles
My E. I. Riebe, Dionysis I. Foustoukos, Conel M. O'D. Alexander +4
Interplanetary dust particles (IDPs) were likely major sources of extraterrestrial organics to the early Earth. However, IDPs experience heating to > 500 C for up to several sec…
Presolar Grains in Primitive Ungrouped Carbonaceous Chondrite Northwest Africa 5958
Larry R. Nittler, Rhonda M. Stroud, Conel M. O'D. Alexander +1
We report a correlated NanoSIMS-transmission electron microscopy study of the ungrouped carbonaceous chondrite Northwest Africa (NWA) 5958. We identified 10 presolar SiC grains, 2…
High-temperature Dust Condensation around an AGB Star: Evidence from a Highly Pristine Presolar Corundum
Aki Takigawa, Rhonda M. Stroud, Larry R. Nittler +2
Corundum (-AlO) and amorphous or metastable AlO are common components of circumstellar dust observed around O-rich asymptotic giant branch (AGB) stars an…
Extremely Cr- and Ti-rich presolar oxide grains in a primitive meteorite: Formation in rare types of supernovae and implications for the astrophysical context of solar system birth
Larry R. Nittler, Conel M. O'D. Alexander, Nan Liu +1
We report the identification of 19 presolar oxide grains from the Orgueil CI meteorite with substantial enrichments in Cr, with Cr/Cr ratios ranging from 1.2 t…