Carnegie supernova project-II: Extending the near-infrared hubble diagram for type ia supernovae to z ~ 0.1

Phillips, M. M.; Contreras, C; Hsiao, E Y; Morrell, N; Burns, Christopher R; Stritzinger, M; Ashall, C.; Freedman, Wendy L; Hoeflich, P.; Persson, S E; Lidman, Chris; Schmidt, Brian

Carnegie supernova project-II: Extending the near-infrared hubble diagram for type ia supernovae to z ~ 0.1

Date

2019

Authors

Phillips, M. M.

Contreras, C

Hsiao, E Y

Morrell, N

Burns, Christopher R

Stritzinger, M

Ashall, C.

Freedman, Wendy L

Hoeflich, P.

Persson, S E

Publisher

University of Chicago Press

Abstract

The Carnegie Supernova Project-II (CSP-II) was an NSF-funded, four-year program to obtain optical and near-infrared observations of a "Cosmology" sample of ~100 Type Ia supernovae located in the smooth Hubble flow (0.03 lesssim z lesssim 0.10). Light curves were also obtained of a "Physics" sample composed of 90 nearby Type Ia supernovae at z ≤ 0.04 selected for near-infrared spectroscopic timeseries observations. The primary emphasis of the CSP-II is to use the combination of optical and near-infrared photometry to achieve a distance precision of better than 5%. In this paper, details of the supernova sample, the observational strategy, and the characteristics of the photometric data are provided. In a companion paper, the near-infrared spectroscopy component of the project is presented.