A5020797696- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Particle physics theoretical and experimental studies
- Stellar, planetary, and galactic studies
- Quantum Chromodynamics and Particle Interactions
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Neutrino Physics Research
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Inorganic Fluorides and Related Compounds
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
University of Chicago
2016-2025
University of Illinois Urbana-Champaign
2014-2024
Kavli Institute for Particle Astrophysics and Cosmology
2016-2021
University of Oregon
2017-2021
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2020
Fermi National Accelerator Laboratory
2005-2019
University of Pennsylvania
2017
Lawrence Berkeley National Laboratory
2006
Nephrologisches Zentrum Villingen-Schwenningen
2002
University of Wisconsin–Madison
2001
This paper describes the Seventh Data Release of Sloan Digital Sky Survey (SDSS), marking completion original goals SDSS and end phase known as SDSS-II. It includes 11,663 deg2 imaging data, with most ∼2000 increment over previous data release lying in regions low Galactic latitude. The catalog contains five-band photometry for 357 million distinct objects. survey also repeat on a 120° long, 25 wide stripe along celestial equator Southern Cap, some covered by many 90 individual runs. We...
We present optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey. detail improvements to PS1 SN photometry, astrometry calibration that reduce systematic uncertainties in distances. combine subset of 279 ($0.03 < z 0.68$) with useful distance estimates from SDSS, SNLS, various low-z HST samples form largest combined sample consisting a total 1048 ranging $0.01 2.3$, which we...
Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons (0.05 <z< 0.4), years (0.2 1), it totals 740 spectroscopically confirmed supernovae with high-quality light curves.
This paper describes the Sixth Data Release of Sloan Digital Sky Survey. With this data release, imaging northern Galactic cap is now complete. The survey contains images and parameters roughly 287 million objects over 9583 deg2, including scans a large range latitudes longitudes. also includes 1.27 spectra stars, galaxies, quasars, blank sky (for subtraction) selected 7425 deg2. release much more stellar spectroscopy than was available in previous releases detailed estimates temperatures,...
We present UV, optical, and NIR photometry of the first electromagnetic counterpart to a gravitational wave source from Advanced LIGO/Virgo, binary neutron star merger GW170817. Our data set extends discovery optical at $0.47$ days $18.5$ post-merger, includes observations with Dark Energy Camera (DECam), Gemini-South/FLAMINGOS-2 (GS/F2), {\it Hubble Space Telescope} ({\it HST}). The spectral energy distribution (SED) inferred this $0.6$ is well described by blackbody model $T\approx 8300$...
We present measurements of the Hubble diagram for 103 Type Ia supernovae (SNe) with redshifts 0.04 < z 0.42, discovered during first season (Fall 2005) Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. These data fill in redshift "desert" between low- and high-redshift SN surveys. combine SDSS-II new distance estimates published from ESSENCE survey, Legacy Survey, Space Telescope, a compilation nearby measurements. Combining Baryon Acoustic Oscillations SDSS Luminous Red Galaxy sample...
The Dark Energy Camera is a new imager with 22 diameter field of view mounted at the prime focus Victor M. Blanco 4 m telescope on Cerro Tololo near La Serena, Chile. camera was designed and constructed by Survey Collaboration meets or exceeds stringent requirements for wide-field supernova surveys which collaboration uses it. consists five-element optical corrector, seven filters, shutter 60 cm aperture, charge-coupled device (CCD) focal plane 250 μm thick fully depleted CCDs cooled inside...
Abstract We present the Dark Energy Camera (DECam) discovery of optical counterpart first binary neutron star merger detected through gravitational-wave emission, GW170817. Our observations commenced 10.5 hr post-merger, as soon localization region became accessible from Chile. imaged 70 deg 2 in i and z bands, covering 93% initial integrated probability, to a depth necessary identify likely counterparts (e.g., kilonova). At 11.4 post-merger we bright transient located nucleus NGC 4993 at...
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z 0.35) Type Ia supernovae (SNe Ia) using repeated five-band (ugriz) imaging over an area of 300 sq. deg. survey region is stripe 2.5° wide centered the celestial equator in Southern Galactic Cap that been imaged numerous times earlier years, enabling construction deep reference image discovery new objects. Supernova observations are being...
We present a near-infrared spectral sequence of the electromagnetic counterpart to binary neutron star merger GW170817 detected by Advanced LIGO/Virgo. Our dataset comprises seven epochs J+H spectra taken with FLAMINGOS-2 on Gemini-South between 1.5 and 10.5 days after merger. In initial epoch, spectrum is dominated smooth blue continuum due high-velocity, lanthanide-poor kilonova component. Starting following night, all subsequent instead show features that are similar those predicted in...
We describe the Dark Energy Survey (DES) photometric data set assembled from first three years of science operations to support DES Year 3 cosmology analyses, and provide usage notes aimed at broad astrophysics community. Y3 Gold improves on previous releases DES, Y1 Data Release 1 (DES DR1), presenting an expanded curated that incorporates algorithmic developments in image detrending processing, calibration, object classification. comprises nearly 5000 square degrees grizY imaging south...
Abstract We present cosmological constraints from the sample of Type Ia supernovae (SNe Ia) discovered and measured during full 5 yr Dark Energy Survey (DES) SN program. In contrast to most previous samples, in which SNe are classified based on their spectra, we classify DES using a machine learning algorithm applied light curves four photometric bands. Spectroscopic redshifts acquired dedicated follow-up survey host galaxies. After accounting for likelihood each being an Ia, find 1635...
We have compared the decay rates of ${K}_{L}$ and ${K}_{S}$ to ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ final states using a subset data from KTeV experiment (E832) at Fermilab. find that direct-CP-violation parameter $\mathrm{Re}({\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon})$ is equal...
We report Nearby Supernova Factory observations of SN 2005gj, the second confirmed case a "hybrid" Type Ia/IIn supernova. Our early-phase photometry 2005gj shows that interaction is much stronger than for prototype, 2002ic. first spectrum hot continuum with broad and narrow H-alpha emission. Later spectra, spanning over 4 months from outburst, show clear Ia features combined H-gamma, H-beta, HeI 5876,7065 in At higher resolution, P Cygni profiles are apparent. Surprisingly, we also observe...
The Sloan Digital Sky Survey-II Supernova Survey has identified a large number of new transient sources in 300 deg2 region along the celestial equator during its first two seasons three-season campaign. Multi-band (ugriz) light curves were measured for most sources, which include solar system objects, galactic variable stars, active nuclei, supernovae (SNe), and other astronomical transients. imaging survey is augmented by an extensive spectroscopic follow-up program to identify SNe, measure...
We present extensive u'g'r'i'BVRIYJHKs photometry and optical spectroscopy of the Type Ia supernova (SN) 2005hk. These data reveal that SN 2005hk was nearly identical in its observed properties to 2002cx, which has been called "the most peculiar known supernova." Both supernovae exhibited high‐ionization 1991T–like premaximum spectra, yet low peak luminosities like 1991bg. The spectra 2005hk, expansion velocities were roughly half those typical supernovae. R I light curves both also not...
We present ugriz light curves for 146 spectroscopically-confirmed or spectroscopically-probable Type Ia supernovae (SNe) from the 2005 season of Sloan Digital Sky Survey-II Supernova (SN) survey. The have been constructed using a photometric technique that we call scene modeling, which is described in detail here; major feature SN brightnesses are extracted stack images without spatial resampling convolution image data. This procedure produces accurate photometry along with estimates...
We present precise tests of CP and CPT symmetry based on the full dataset K to pipi decays collected by KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, 1999. This contains 16 million 2pi0 69 pi+pi- decays. measure direct violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. find KL-KS mass difference Deltam (5270 12)x10^6 hbar/s KS lifetime tauS (89.62 0.05)x10-12 s. also several parameters that test invariance. between phase indirect parameter, epsilon,...
We describe a general analysis package for supernova (SN) light curves, called SNANA, that contains simulation, curve fitter, and cosmology fitter. The software is designed with the primary goal of using SNe Ia as distance indicators determination cosmological parameters, but it can also be used to study efficiencies analyses SN rates, estimate contamination from non-Ia SNe, optimize future surveys. Several models are available within same architecture, allowing technical features such...
We report results from the Supernova Photometric Classification Challenge (SNPCC), a publicly released mix of simulated supernovae (SNe), with types (Ia, Ibc, and II) selected in proportion to their expected rate. The simulation was realized griz filters Dark Energy Survey (DES) realistic observing conditions (sky noise, point-spread function atmospheric transparency) based on years recorded at DES site. Simulations non-Ia type SNe are spectroscopically confirmed light curves that include...
We analyze the three-year Sloan Digital Sky Survey II (SDSS-II) Supernova (SN) data and identify a sample of 1070 photometric Type Ia supernova (SN Ia) candidates based on their multiband light curve data. This consists SN with no spectroscopic confirmation, subset 210 having redshifts host galaxies measured while remaining 860 are purely in identification. describe method for estimating efficiency purity classification when confirmation only limited is available, demonstrate that from...
We present an analysis of supernova light curves simulated for the upcoming Dark Energy Survey (DES) search. The simulations employ a code suite that generates and fits realistic in order to obtain distance modulus/redshift pairs are passed cosmology fitter. investigated several different survey strategies including field selection, selection biases, photometric redshift measurements. Using results this study, we chose 30 deg2 search area griz filter set. forecast (1) will provide...
We describe an algorithm for identifying point-source transients and moving objects on reference-subtracted optical images containing artifacts of processing instrumentation. The makes use the supervised machine learning technique known as Random Forest. present results from its in Dark Energy Survey Supernova program (DES-SN), where it was trained using a sample 898,963 signal background events generated by transient detection pipeline. After reprocessing data collected during first DES-SN...
We present the results of a search for rapidly evolving transients in Dark Energy Survey Supernova Programme. These events are characterized by fast light-curve evolution (rise to peak ≲10 d and exponential decline ≲30 after peak). discovered 72 events, including 37 with spectroscopic redshift from host galaxy spectral features. The increase total number rapid optical more than factor two. They found at wide range redshifts (0.05 < |$z$| 1.56) brightnesses (−15.75 > Mg −22.25). multiband...
We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample 207 spectroscopically confirmed SNe three years DES-SN, combined with low-redshift sample 122 literature. Our "DES-SN3YR" result these 329 is based on series companion analyses and improvements covering SN discovery, spectroscopic selection, photometry, calibration, distance bias corrections, evaluation...