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

  • Author(s): Phillips, MM
  • Contreras, C
  • Hsiao, EY
  • Morrell, N
  • Burns, CR
  • Stritzinger, M
  • Ashall, C
  • Freedman, WL
  • Hoeflich, P
  • Persson, SE
  • Piro, AL
  • Suntzeff, NB
  • Uddin, SA
  • Anais, J
  • Baron, E
  • Busta, L
  • Campillay, A
  • Castellón, S
  • Corco, C
  • Diamond, T
  • Gall, C
  • Gonzalez, C
  • Holmbo, S
  • Krisciunas, K
  • Roth, M
  • Serón, J
  • Taddia, F
  • Torres, S
  • Anderson, JP
  • Baltay, C
  • Folatelli, G
  • Galbany, L
  • Goobar, A
  • Hadjiyska, E
  • Hamuy, M
  • Kasliwal, M
  • Lidman, C
  • Nugent, PE
  • Perlmutter, S
  • Rabinowitz, D
  • Ryder, SD
  • Schmidt, BP
  • Shappee, BJ
  • Walker, ES
  • et al.

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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<z<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.

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