Lick Observatory Supernova Search follow-up program: photometry data release of 93 Type Ia supernovae

Abstract

We present BVRI and unfiltered light curves of 93 Type Ia supernovae (SNe Ia) from the Lick Observatory Supernova Search (LOSS) follow-up program conducted between 2005 and 2018. Our sample consists of 78 spectroscopically normal SNe Ia, with the remainder divided between distinct subclasses (3 SN 1991bg-like, 3 SN 1991T-like, 4 SNe Iax, 2 peculiar, and 3 super-Chandrasekhar events), and has a median redshift of 0.0192. The SNe in our sample have a median coverage of 16 photometric epochs at a cadence of 5.4 d, and the median first observed epoch is ∼4.6 d before maximum B-band light. We describe how the SNe in our sample are discovered, observed, and processed, and we compare the results from our newly developed automated photometry pipeline to those from the previous processing pipeline used by LOSS. After investigating potential biases, we derive a final systematic uncertainty of 0.03 mag in BVRI for our data set. We perform an analysis of our light curves with particular focus on using template fitting to measure the parameters that are useful in standardizing SNe Ia as distance indicators. All of the data are available to the community, and we encourage future studies to incorporate our light curves in their analyses.

Delayed Detonation Thermonuclear Supernovae with an Extended Dark Matter Component

“…In particular, some of these events show a slower decline rate than that of a normal supernova. We extract the R-band light curves 8 of the following supernova events: SN 1999ac (Candia et al 2003;Ganeshalingam et al 2010;Silverman et al 2012), SN 2002cx, SN 2002es (Ganeshalingam et al 2012), SN 2005hk (Chornock et al 2006Phillips et al 2007;Silverman et al 2012;Stahl et al 2019), and SN 2012Z (Silverman et al 2012;Stahl et al 2019), from The Open Supernova Catalog (White et al 2015), and we show them together with the R-band light curves of our models in Figure 16. We find that some of the events, for instance, SN 1999ac and SN 2002cx are well fitted by the model DM1 before 15 days post-R-band maximum, 9 suggesting that other than some non-Chandrasekhar models, these two events may also be explained by thermonuclear supernovae having DM admixtures.…”

First Cosmology Results using Supernovae Ia from the Dark Energy Survey: Survey Overview, Performance, and Supernova Spectroscopy

“…At redshift z1 these cosmology-oriented programs include the Supernova Legacy Survey (SNLS; Conley et al 2011), the Sloan Digital Sky Survey-II Supernova Program (SDSS-II; Frieman et al 2008), and more recently, Pan-STARRS (Tonry et al 2012;Rest et al 2014). The low-redshift sample necessary for anchoring the Hubble diagram includes SNe Ia heterogeneously collated from the Calán/Tololo survey (Hamuy et al 1996), several Harvard-Smithsonian Center for Astrophysics (CfA) surveys (Riess et al 1999;Jha et al 2006;Hicken et al 2009Hicken et al , 2012, the Carnegie Supernova Project (CSP; Contreras et al 2010;Stritzinger et al 2011;Krisciunas et al 2017), the Lick Observatory Supernova Search (Ganeshalingam et al 2010;Stahl et al 2019), and (more recently) the homogeneous Foundation Survey (Foley et al 2018). Nearly all observations of SNe Ia at z>1.1 are obtained from space with a few dozen well-observed objects to date (Suzuki et al 2012;Riess et al 2018;Williams et al 2020).…”

The Pantheon+ Analysis: Improving the Redshifts and Peculiar Velocities of Type Ia Supernovae Used in Cosmological Analyses

“…Heliocentric Redshift Update Discrepancies Original ATEL adopts a redshift of 0.045(Zhang & Wang 2014), subsequent classification 0.043(Balam 2016), photometric host redshift of 0.042(Yan et al 2014) is in agreement. Old redshift comes fromStahl et al (2019), which cites CBET 3893(Yuk et al 2014). This smaller redshift is a valid but less likely fit to the SN spectrum.Origin of z old uncertain.…”