Article

CfA4: LIGHT CURVES FOR 94 TYPE Ia SUPERNOVAE

M. HickenHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]P. ChallisHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]R. KirshnerHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]A. RestSpace Telescope Science Institute, Baltimore, MD 21218, USAClaire CramerNIST (National Institute of Standards and Technology), Gaithersburg, MD 20899, USAW. M. Wood‐VaseyDepartment of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USAG. Á. BakosDepartment of Astrophysical Sciences, Princeton University, Princeton, NJ 08542, USAZ. BenkhaldounHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Warren R. BrownHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Nelson CaldwellHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]M. CalkinsHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]T. CurrieNASA, Goddard Space Flight Center, Greenbelt, MD 20771, USAKathy de KleerDepartment of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USAG. EsquerdoPlanetary Science Institute, 1700 East Fort Lowell Road, Tucson, AZ 85719, USAMark E. EverettPlanetary Science Institute, 1700 East Fort Lowell Road, Tucson, AZ 85719, USAE. FalcoHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]J. M. FernándezHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Andrew S. FriedmanHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Ted GronerHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]J. D. HartmanDepartment of Astrophysical Sciences, Princeton University, Princeton, NJ 08542, USAMatthew J. HolmanHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]R. HutchinsHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Sonia KeysHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]David KippingHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]David W. LathamHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]G. H. MarionHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Gautham NarayanHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]M. A. PahreHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]András PálHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]W. N. PetersHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]G. PerumpillyDepartment of Physics, University of South Dakota, Vermillion, SD 57069, USABen RipmanHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Brigitta SipőczHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Andrew SzentgyorgyiHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Sumin TangHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]M. A. P. TorresHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]Amali VazDepartment of Physics, Harvard University, Cambridge, MA 02138, USAScott WolkHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]A. ZezasHarvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; [email protected]

2012en

ABI

Abstract

We present multi-band optical photometry of 94 spectroscopically confirmed Type Ia supernovae (SNe Ia) in the redshift range 0.0055-0.073, obtained between 2006 and 2011. There are a total of 5522 light-curve points. We show that our natural-system SN photometry has a precision of 0.03 mag in BV r i , 0.06 mag in u , and 0.07 mag in U for points brighter than 17.5 mag and estimate that it has a systematic uncertainty of 0.014, 0.010, 0.012, 0.014, 0.046, and 0.073 mag in BV r i u U , respectively. Comparisons of our standard-system photometry with published SN Ia light curves and comparison stars reveal mean agreement across samples in the range of 0.00-0.03 mag. We discuss the recent measurements of our telescope-plus-detector throughput by direct monochromatic illumination by Cramer et al. This technique measures the whole optical path through the telescope, auxiliary optics, filters, and detector under the same conditions used to make SN measurements. Extremely well characterized natural-system passbands (both in wavelength and over time) are crucial for the next generation of SN Ia photometry to reach the 0.01 mag accuracy level. The current sample of low-z SNe Ia is now sufficiently large to remove most of the statistical sampling error from the dark-energy error budget. But pursuing the dark-energy systematic errors by determining highly accurate detector passbands, combining optical and near-infrared (NIR) photometry and spectra, using the nearby sample to illuminate the population properties of SNe Ia, and measuring the local departures from the Hubble flow will benefit from larger, carefully measured nearby samples.

Identifiers

DOI: 10.1088/0067-0049/200/2/12

Citations and references

Cited by 20 references

Metrics — AkademScholar