Nicholas T. Ouellette
Arizona State University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Nicholas T. Ouellette.
The Astrophysical Journal | 2007
Nicholas T. Ouellette; Steven Joseph Desch; J. Jeff Hester
The early solar system contained short-lived radionuclides such as 60Fe (t1/2 = 1.5 Myr) whose most likely source was a nearby supernova. Previous models of solar system formation considered a supernova shock that triggered the collapse of the Suns nascent molecular cloud. We advocate an alternative hypothesis, that the solar systems protoplanetary disk had already formed when a very close (<1 pc) supernova injected radioactive material directly into the disk. We conduct the first numerical simulations designed to answer two questions related to this hypothesis: Will the disk be destroyed by such a close supernova, and will any of the ejecta be mixed into the disk? Our simulations demonstrate that the disk does not absorb enough momentum from the shock to escape the protostar to which it is bound. Only low amounts (<1%) of mass loss occur, due to stripping by Kelvin-Helmholtz instabilities across the top of the disk, which also mix into the disk about 1% of the intercepted ejecta. These low efficiencies of destruction and injection are due to the fact that the high disk pressures prevent the ejecta from penetrating far into the disk before stalling. Injection of gas-phase ejecta is too inefficient to be consistent with the abundances of radionuclides inferred from meteorites. On the other hand, the radionuclides found in meteorites would have condensed into dust grains in the supernova ejecta, and we argue that such grains will be injected directly into the disk with nearly 100% efficiency. The meteoritic abundances of the short-lived radionuclides such as 60Fe therefore are consistent with injection of grains condensed from the ejecta of a nearby (<1 pc) supernova, into an already formed protoplanetary disk.
The Astrophysical Journal | 2010
Nicholas T. Ouellette; Steve Desch; J. Jeff Hester
Geochimica et Cosmochimica Acta | 2009
Nicholas T. Ouellette; Steven Joseph Desch; Martin Bizzarro; Alan P. Boss; Fred J. Ciesla; Bradley S. Meyer
Archive | 2004
Nicholas T. Ouellette; Steven Joseph Desch; J. Jeff Hester; Laurie A. Leshin
Archive | 2007
Nicholas T. Ouellette; Steven Joseph Desch
Archive | 2004
Steven Joseph Desch; Nicholas T. Ouellette; J. Jeff Hester; Laurie A. Leshin
Archive | 2010
Nicholas T. Ouellette; Steven Joseph Desch
Archive | 2006
Nicholas T. Ouellette; Steven Joseph Desch
Archive | 2005
Steven Joseph Desch; Nicholas T. Ouellette
Archive | 2005
Steven Joseph Desch; Nicholas T. Ouellette; J. Jeff Hester