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Metal-Rich RRc stars in the Carnegie RR Lyrae Survey
Christopher Sneden, George W. Preston, Juna A. Kollmeier +6
We describe and employ a stacking procedure to investigate abundances derived from the low S/N spectra obtained in the Carnegie RR Lyrae Survey (CARRS; Kollmeier et al. 2013). We f…
Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
M. R. Drout, A. L. Piro, B. J. Shappee +41
On 2017 August 17, gravitational waves were detected from a binary neutron star merger, GW170817, along with a coincident short gamma-ray burst, GRB170817A. An optical transient so…
The Unprecedented Properties of the First Electromagnetic Counterpart to a Gravitational Wave Source
Matthew R. Siebert, Ryan J. Foley, Maria R. Drout +15
We discovered Swope Supernova Survey 2017a (SSS17a) in the LIGO/Virgo Collaboration (LVC) localization volume of GW170817, the first detected binary neutron star (BNS) merger, only…
The Old Host-Galaxy Environment of SSS17a, the First Electromagnetic Counterpart to a Gravitational Wave Source
Y. -C. Pan, C. D. Kilpatrick, J. D. Simon +16
We present an analysis of the host-galaxy environment of Swope Supernova Survey 2017a (SSS17a), the discovery of an electromagnetic counterpart to a gravitational wave source, GW17…
Type II supernova spectral diversity II: Spectroscopic and photometric correlations
Claudia P. Gutiérrez, Joseph P. Anderson, Mario Hamuy +7
We present an analysis of observed trends and correlations between a large range of spectral and photometric parameters of more than 100 type II supernovae (SNe~II), during the pho…
Type II supernova spectral diversity I: Observations, sample characterization and spectral line evolution
Claudia P. Gutiérrez, Joseph P. Anderson, Mario Hamuy +23
We present 888 visual-wavelength spectra of 122 nearby type II supernovae (SNe II) obtained between 1986 and 2009, and ranging between 3 and 363 days post explosion. In this first…
The Carnegie Supernova Project I: Third Photometry Data Release of Low-Redshift Type Ia Supernovae and Other White Dwarf Explosions
Kevin Krisciunas, Carlos Contreras, Christopher R. Burns +27
We present final natural system optical (ugriBV) and near-infrared (YJH) photometry of 134 supernovae (SNe) with probable white dwarf progenitors that were observed in 2004-2009 as…
Light and color curve properties of type Ia supernovae: Theory vs. Observations
P. Hoeflich, E. Y. Hsiao, C. Ashall +10
We study optical light curve(LC) relations of type Ia supernovae(SNe~Ia) for their use in cosmology using high-quality photometry published by the Carnegie-Supernovae-Project (CSP-…
The Evolution and Physical Parameters of WN3/O3s: a New Type of Wolf-Rayet Star
Kathryn F. Neugent, Philip Massey, D. John Hillier +1
As part of a search for Wolf-Rayet (WR) stars in the Magellanic Clouds, we have discovered a new type of WR star in the Large Magellanic Cloud (LMC). These stars have both strong e…
A Modern Search for Wolf-Rayet Stars in the Magellanic Clouds. III. A Third Year of Discoveries
Philip Massey, Kathryn F. Neugent, Nidia Morrell
For the past three years we have been conducting a survey for WR stars in the Large and Small Magellanic Clouds (LMC, SMC). Our previous work has resulted in the discovery of a new…
SPIRITS: Uncovering Unusual Infrared Transients With Spitzer
Mansi M. Kasliwal, John Bally, Frank Masci +44
We present an ongoing, systematic search for extragalactic infrared transients, dubbed SPIRITS --- SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IR…