# overview
I am working on two principal areas of observational astronomy that are related. I am a member of the ESSENCE Project, a supernova search carried out on the CTIO 4-m telescope. I am also working on the reduction of light curves of more nearby supernovae observed at the Cerro Tololo Observatory and the Las Campanas Observatory.

# keywords[]
Supernovae: Individual (sn 1980n, Sn 1981d, Sn 2006dd, Sn 2006mr)

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Supernovae: Individual (sn 2003gs, Sn 2003hv)

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Supernovae: Individual (sn 1999em, Sn 2003hn)

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Supernovae: Individual: Sn 2003fg, Sn 2007if, Sn 2009dc, Lsq12gdj

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Supernovae : Individual (sn 1957a, Sn 1991bg, Sn 1998bp, Sn 1999by)

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Supernovae: Individual (sn 2009dc, Sn 2011aa, Sn 2012dn)

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(stars:) Supernovae: General Online Material: Color Figures

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Supernovae : Individual (sn 1999ee, Sn 2000bh, Sn 2000ca, Sn 2001ba)

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Supernovae : Individual (sn 2004s, Sn 2001el)

# publications[].label
THE DISTANCE TO NGC 1316 (FORNAX A) FROM OBSERVATIONS OF FOUR TYPE Ia SUPERNOVAE

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PHOTOMETRY OF VARIABLE STARS FROM DOME A, ANTARCTICA

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THE FAST DECLINING TYPE Ia SUPERNOVA 2003gs, AND EVIDENCE FOR A SIGNIFICANT DISPERSION IN NEAR-INFRARED ABSOLUTE MAGNITUDES OF FAST DECLINERS AT MAXIMUM LIGHT

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SPECTROSCOPY OF HIGH-REDSHIFT SUPERNOVAE FROM THE ESSENCE PROJECT: THE FIRST FOUR YEARS

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CCD Photometry of NGC 2482 and Five Previously Unobserved Open Star Clusters

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Probing type Ia supernova properties using bolometric light curves from the Carnegie Supernova Project and the CfA Supernova Group

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The ESSENCE supernova survey: Survey optimization, observations, and supernova photometry

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Deep Impact, Stardust-NExT and the behavior of Comet 9P/Tempel 1 from 1997

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The normal Type Ia SN 2003hv out to very late phases

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Evidence for Distinct Components of the Galactic Stellar Halo from 838 RR Lyrae Stars Discovered in the LONEOS-I Survey

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Carnegie Supernova Project-II: The Near-infrared Spectroscopy Program

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Constraining cosmic evolution of type Ia supernovae

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Doradus Stars: Defining a New Class of Pulsating Variables

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The spatial distribution and velocity field of the molecular hydrogen line emission from the centre of the Galaxy

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Type II Supernova Spectral Diversity. I. Observations, Sample Characterization, and Spectral Line Evolution

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Twenty-Three High-Redshift Supernovae from the Institute for Astronomy Deep Survey: Doubling the Supernova Sample at z > 0.7 **CFHT: Based in part on observations obtained at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council of Canada, the Institut National des Science de lUnivers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. CTIO: Based in part on observations taken at the Cerro Tololo Inter-American Observatory. Keck: Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. Magellan: Based in part on observations from the 6.5 m Baade telescope operated by the Observatories of the Carnegie Institution of

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Light Pollution At High Zenith Angles, As Measured at Cerro Tololo Inter-American Observatory1 1 Based in part on observations taken at the Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation.

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SPECTROSCOPY OF TYPE Ia SUPERNOVAE BY THE CARNEGIE SUPERNOVA PROJECT

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UBVRIz LIGHT CURVES OF 51 TYPE II SUPERNOVAE

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Optical and Infrared Photometry of the Type Ia Supernovae 1991T, 1991bg, 1999ek, 2001bt, 2001cn, 2001cz, and 2002bo

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Rapid infrared and optical variability in the bright quasar 3C273

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THE GOLDEN STANDARD TYPE Ia SUPERNOVA 2005cf: OBSERVATIONS FROM THE ULTRAVIOLET TO THE NEAR-INFRARED WAVEBANDS

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Uniformity of (V - near-infrared) color evolution of type Ia supernovae and implications for host galaxy extinction determination

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The luminosity of SN 1999by in NGC 2841 and the nature of "peculiar" Type Ia supernovae

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The multiperiodicity of the  Doradus stars HD 224945 and HD 224638 as detected from a multisite campaign*

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Supernova cosmology and the essence project

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EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE

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Determining the eccentricity of the Moons orbit without a telescope

# publications[].publisher
American Association of Physics Teachers (AAPT)

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Spectrophotometry of Very Bright Stars in the Southern Sky

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OPTICAL NIGHT-SKY BRIGHTNESS AT MAUNA KEA OVER THE COURSE OF A COMPLETE SUNSPOT CYCLE

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Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts**Based in part on observations obtained at the Cerro Tololo Inter-American Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation (NSF); the European Southern Observatory, Chile (ESO program 170.A-0519); the Gemini Observatory, which is operated by AURA under a cooperative agreement with the NSF on behalf of the Gemini partnership (the NSF [United States], the Particle Physics and Astronomy Research Council [United Kingdom], the National Research Council [Canada], CONICYT [Chile], the Australian Research Council [Australia], CNPq [Brazil], and CONICET [Argentina]) (programs GN-2002B-Q-14, GN-2003B-Q-11, and GS-2003B-Q-11); the Magellan Telescopes at Las Campanas Observatory; the MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona; and the F

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SWIFT ULTRAVIOLET OBSERVATIONS OF SUPERNOVA 2014J IN M82: LARGE EXTINCTION FROM INTERSTELLAR DUST

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Stardust-NExT, Deep Impact, and the accelerating spin of 9P/Tempel 1

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SN 2002cv: a heavily obscured Type Ia supernova

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THE CARNEGIE SUPERNOVA PROJECT: ANALYSIS OF THE FIRST SAMPLE OF LOW-REDSHIFT TYPE-Ia SUPERNOVAE

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Optical and near-infrared observations of the highly reddened, rapidly expanding type Ia supernova SN 2006X in M100

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The  Dor variable HD 164615: results from a multisite photometric campaign

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Carnegie Supernova Project-II: Extending the Near-infrared Hubble Diagram for Type Ia Supernovae to z 0.1

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THE MOST SLOWLY DECLINING TYPE Ia SUPERNOVA 2001ay

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A More Complete Anaylsis of the Errors in ULUGH Beg's Star Catalogue

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Optical sky brightness at Cerro Tololo Inter-American observatory from 1992 to 2006

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A HUBBLE DIAGRAM FROM TYPE II SUPERNOVAE BASED SOLELY ON PHOTOMETRY: THE PHOTOMETRIC COLOR METHOD* * This paper includes data gathered with the 6.5 m Magellan Telescopes, with the du Pont and Swope telescopes located at Las Campanas Observatory, Chile, and the Gemini Observatory, Cerro Pachon, Chile (Gemini Program GS-2008B-Q-56). Based on observations collected at the European Organization for Astronomical Research in the Southern Hemisphere, Chile (ESO Programmes 076.A-0156,078.D-0048, 080.A-0516, and 082.A-0526).

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The Carnegie Supernova Project I Photometry data release of low-redshift stripped-envelope supernovae

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The Carnegie Supernova Project. I. Third Photometry Data Release of Low-redshift Type Ia Supernovae and Other White Dwarf Explosions

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The first three rungs of the cosmological distance ladder

# publications[].publisher
American Association of Physics Teachers (AAPT)

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CHARACTERIZING THE V-BAND LIGHT-CURVES OF HYDROGEN-RICH TYPE II SUPERNOVAE

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LIGHT CURVES OF 213 TYPE Ia SUPERNOVAE FROM THE ESSENCE SURVEY

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Candidate RR Lyrae Stars Found in Sloan Digital Sky Survey Commissioning Data**Based on observations obtained with the Sloan Digital Sky Survey.

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Discovery of the Low-Redshift Optical Afterglow of GRB 011121 and Its Progenitor Supernova SN 2001ke**Based on data from the Optical Gravitational Lensing Experiment 1.3 m and the Magellan 6.5 m Baade telescopes and the Hubble Space Telescope.

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The Type Ia Supernova 1999aw: A Probable 1999aa-like Event in a Low-Luminosity Host Galaxy

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The Type Ia supernova 2004s, a clone of SN 2001el, and the optimal photometric bands for extinction estimation

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Spectroscopic Discovery of the Supernova 2003dh Associated with GRB 030329**Based on data from the Multiple Mirror Telescope Observatory 6.5 m telescope, the Magellan 6.5 m Clay telescope, and the Fred Lawrence Whipple Observatory 1.5 m telescope.

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Spectroscopy of High-Redshift Supernovae from the ESSENCE Project: The First 2 Years**Based in part on observations obtained at the Cerro Tololo Inter-American Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under a cooperative agreement with the National Science Foundation (NSF); the European Southern Observatory, Chile (ESO Programme 170.A-0519); the Gemini Observatory, which is operated by AURA under a cooperative agreement with the NSF on behalf of the Gemini partnership (the NSF [United States], the Particle Physics and Astronomy Research Council [United Kingdom], the National Research Council [Canada], CONICYT [Chile], the Australian Research Council [Australia], CNPq [Brazil], and CONICET [Argentina] [programs GN-2002B-Q-14, GN-2003B-Q-14, and GS-2003B-Q-11]); the Magellan Telescopes at Las Campanas Observatory; the MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona; and the F.

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Mapping of infrared helium and hydrogen line profiles in the central few arcseconds of the Galaxy

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Optical and Infrared Photometry of the Nearby Type Ia Supernova 2001el

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A PHYSICAL MODEL FOR SN 2001ay, A NORMAL, BRIGHT, EXTREMELY SLOW DECLINING TYPE Ia SUPERNOVA

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Light and Color Curve Properties of Type Ia Supernovae: Theory Versus Observations

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SN 2012fr: Ultraviolet, Optical, and Near-infrared Light Curves of a Type Ia Supernova Observed within a Day of Explosion

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SECONDARY PARAMETERS OF TYPE Ia SUPERNOVA LIGHT CURVES

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Optical and near-infrared observations of the peculiar type Ia supernova 1999ac

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FIXING THE U-BAND PHOTOMETRY OF TYPE Ia SUPERNOVAE

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The  Doradus-type variable 9 Aurigae: results from a multi-site campaign

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Time dilation in type Ia supernova spectra at high redshift

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DO THE PHOTOMETRIC COLORS OF TYPE II-P SUPERNOVAE ALLOW ACCURATE DETERMINATION OF HOST GALAXY EXTINCTION?

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Early ultraviolet emission in the Type Ia supernova LSQ12gdj: No evidence for ongoing shock interaction

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Exploring the outer solar system with the ESSENCE Supernova Survey

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Mode identification of the slowly pulsating F0V star V398 Aurigae (9 Aur)

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Hubble Diagrams of Type Ia Supernovae in the Near-Infrared

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FIRST RESULTS FROM THE La Silla-QUEST SUPERNOVA SURVEY AND THE CARNEGIE SUPERNOVA PROJECT

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Strong near-infrared carbon in the Type Ia supernova iPTF13ebh

# publications[].id
 Do some type ia supernovae explode as deflagrations?

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Optical Sky Brightness and Transparency during the Winter Season at Dome A Antarctica from the Gattini-All-Sky Camera

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Whole Earth Telescope Observations of the DAV White Dwarf G226-29

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Cosmological Results from High-z Supernovae**Based in part on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS 5-26555. This research is primarily associated with proposal GO-8177, but also uses and reports results from proposals GO-7505, 7588, 8641, and 9118. ****CFHT: Based in part on observations taken with the Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, le Centre National de la Recherche Scientifique de France, and the University of Hawaii. CTIO: Based in part on observations taken at the Cerro Tololo Inter-American Observatory. Keck: Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space

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The  Dor variable HR 8799: results from a multisite campaign

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Photometry of the Type Ia Supernovae 1999cc, 1999cl, and 2000cf**Based in part on observations at Apache Point Observatory, which is operated by the Astrophysical Research Consortium, and in part on observations with the Vatican Advanced Technology Telescope.

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Hubble Space Telescope Observations of Nine High-Redshift ESSENCE SupernovaeaaBased in part on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. This research is associated with proposal GO-9860.,bbBased in part on observations taken at the Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation (NSF).,ccBased in part on observations taken with the Very Large Telescope (VLT) under ESO program 170.A-0519.

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Carnegie Supernova Project-II: Using Near-infrared Spectroscopy to Determine the Location of the Outer ⁵⁶Ni in Type Ia Supernovae

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Investigating the Unusual Spectroscopic Time Evolution in SN 2012fr

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Discovery and progenitor constraints on the Type Ia supernova 2013gy

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Observational constraints on the nature of dark energy: First cosmological results from the ESSENCE supernova survey

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ULTRAVIOLET OBSERVATIONS OF SUPER-CHANDRASEKHAR MASS TYPE Ia SUPERNOVA CANDIDATES WITH SWIFT UVOT

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The Recognition of Unusual Objects in the Sloan Digital Sky Survey Color System

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The System Parameters of DW Ursae Majoris**Based on observations with the NASA/ESA Hubble Space Telescope (HST), obtained at the Space Telescope Science Institute (STScI), which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555, and with the Apache Point Observatory (APO) 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium (ARC).

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Worldwide photometry of the January 1989 Tau Persei eclipse

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Spectral models for early time SN 2011fe observations

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Optical and infrared photometry of the nearby Type Ia supernovae 1999ee, 2000bh, 2000ca, and 2001ba

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Type II Supernovae as Probes of Cosmology

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The Carnegie Supernova Project: Absolute Calibration and the Hubble Constant

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Constraining the Properties of SNe Ia Progenitors from Light Curves

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Asteroseismology of the  Cephei star  Eridani  I. Photometric observations and pulsational frequency analysis

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Imaging and Demography of the Host Galaxies of High-Redshift Type Ia Supernovae**Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. ****Based on observations obtained at the Cerro Tololo Inter-American Observatory, which is operated by AURA, Inc., under NASA contract NAS5-26555.

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Optical and Infrared Photometry of the Unusual Type Ia Supernova 2000cx

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New 1982  1990 photometry of  Andromedae and its 11-year cycle

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Nonradial pulsation of the unevolved hot  Scuti star CD-247599 discovered with the Whole Earth Telescope

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Type II supernovae as distance indicators at near-IR wavelengths

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Scrutinizing exotic cosmological models using essence supernova data combined with other cosmological probes

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INTEGRATED OPTICAL POLARIZATION OF NEARBY GALAXIES

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Multimode Pulsations of the  Bootis Star 29 Cygni: The 1995 and 1996 Multisite Campaigns

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SUPERNOVA 2003bg: THE FIRST TYPE IIb HYPERNOVA

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PERSISTENT C II ABSORPTION IN THE NORMAL TYPE Ia SUPERNOVA 2002fk

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Photometry and Spectroscopy of GRB 030329 and Its Associated Supernova 2003dh: The First Two Months

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A Physical Basis for the H-band Blue-edge Velocity and Light-curve Shape Correlation in Context of Type Ia Supernova Explosion Physics

# researcherOn[].label
The Carnegie Supernova Project - Pushing the Precision of Type Ia Supernovae as Cosmological Standard Candles

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

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Improving Type Ia Supernova as Standard Candles by Correlating the Ultraviolet and Optical Properties

# researcherOn[].awardedBy.label
National Aeronautics and Space Administration - (Washington D.C., District of Columbia, United States)

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Collaborative Research: Three-Dimensional Simulations of Type Ia Supernovae Constraining Models With Observations

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# streetAddress
Texas A&M University; Physics And Astronomy; 4242 TAMU