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Dive into the research topics where David W. Harris is active.

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Featured researches published by David W. Harris.


The Astrophysical Journal | 2012

Constraints on Type Ia Supernova Progenitor Companions from Early Ultraviolet Observations with Swift

Peter J. Brown; Kyle S. Dawson; David W. Harris; Matthew D. Olmstead; Peter A. Milne; Peter W. A. Roming

We compare early ultraviolet (UV) observations of Type Ia supernovae (SNe Ia) with theoretical predictions for the brightness of the shock associated with the collision between SN ejecta and a companion star. Our simple method is independent of the intrinsic flux from the SN and treats the flux observed with the Swift/Ultra-Violet Optical Telescope as conservative upper limits on the shock brightness. Comparing this limit with the predicted flux for various shock models, we constrain the geometry of the SN progenitor-companion system. We find the model of a 1 M{sub Sun} red supergiant companion in Roche-lobe overflow to be excluded at a 95% confidence level for most individual SNe for all but the most unfavorable viewing angles. For the sample of 12 SNe taken together, the upper limits on the viewing angle are inconsistent with the expected distribution of viewing angles for red gaint stars as the majority of companions with high confidence. The separation distance constraints do allow main-sequence companions. A better understanding of the UV flux arising from the SN itself as well as continued UV observations of young SNe Ia will further constrain the possible progenitors of SNe Ia.


The Astronomical Journal | 2016

THE COMPOSITE SPECTRUM OF BOSS QUASARS SELECTED FOR STUDIES OF THE Lyα FOREST

David W. Harris; Trey W. Jensen; Nao Suzuki; Julian E. Bautista; Kyle S. Dawson; M. Vivek; Joel R. Brownstein; Jian Ge; Fred Hamann; H. Herbst; Linhua Jiang; Sarah E. Moran; Adam D. Myers; Matthew D. Olmstead; Donald P. Schneider

The Baryon Oscillation Spectroscopic Survey (BOSS) has collected more than 150,000


The Astrophysical Journal | 2016

SPECTRAL EVOLUTION IN HIGH REDSHIFT QUASARS FROM THE FINAL BARYON OSCILLATION SPECTROSCOPIC SURVEY SAMPLE

Trey W. Jensen; M. Vivek; Kyle S. Dawson; Scott F. Anderson; Julian E. Bautista; Dmitry Bizyaev; W. N. Brandt; Joel R. Brownstein; Paul J. Green; David W. Harris; Vikrant Kamble; Ian D. McGreer; Andrea Merloni; Adam D. Myers; Daniel Oravetz; Kaike Pan; Isabelle Pâris; Donald P. Schneider; Audrey Simmons; Nao Suzuki

2.1 \leq z \leq 3.5


The Astrophysical Journal | 2011

Scaling Relations and Overabundance of Massive Clusters at Z ≳ 1 from Weak-Lensing Studies with the Hubble Space Telescope

M. J. Jee; Kyle S. Dawson; Henk Hoekstra; S. Perlmutter; P. Rosati; Mark Brodwin; Nao Suzuki; Benjamin P. Koester; Marc Postman; Lori M. Lubin; Joshua Meyers; S. A. Stanford; K. Barbary; F. Barrientos; Peter R. M. Eisenhardt; Holland C. Ford; David G. Gilbank; Michael D. Gladders; Anthony H. Gonzalez; David W. Harris; X. Huang; C. Lidman; E. S. Rykoff; D. Rubin; A. L. Spadafora

quasar spectra since 2009. Using this unprecedented sample, we create a composite spectrum in the rest-frame of 102,150 quasar spectra from 800 \AA\ to 3300 \AA\ at a signal-to-noise ratio close to 1000 per pixel (


arXiv: Astrophysics of Galaxies | 2016

Spectral Evolution in High Redshift Quasars from the Final BOSS Sample

Trey W. Jensen; M. Vivek; Kyle S. Dawson; Scott F. Anderson; Julian E. Bautista; Dmitry Bizyaev; W. N. Brandt; Joel R. Brownstein; Paul J. Green; David W. Harris; Vikrant Kamble; Ian D. McGreer; Andrea Merloni; Adam D. Myers; Daniel Oravetz; Kaike Pan; Isabelle Pâris; Donald P. Schneider; Audrey Simmons; Nao Suzuki

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Donald P. Schneider

Pennsylvania State University

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Audrey Simmons

New Mexico State University

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Daniel Oravetz

New Mexico State University

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