CfA4: Light Curves for 94 Type Ia Supernovae
- Creators
- Hicken, Malcolm
- de Kleer, Kathy
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 lesssim 0.03 mag in BVr'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 BVr'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.
Additional Information
© 2012. The American Astronomical Society. Received 2012 February 14; accepted 2012 April 5; published 2012 May 17. We thank the staff at FLWO for their dedicated work in maintaining the 1.2 m telescope and instruments. We also thank M. Stritzinger, W. Li, and M. Ganeshalingam for help in comparing the CfA4 sample with the CSP2 and LOSS samples. Finally, we appreciate discussions with K. Mandel. This work has been supported, in part, by NSF grants AST0606772 and AST0907903 to Harvard University. Facility: FLWO:1.2m - Fred Lawrence Whipple Observatory's 1.2 meter TelescopeAttached Files
Published - Hicken_2012_ApJS_200_12.pdf
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Additional details
- Eprint ID
- 94940
- Resolver ID
- CaltechAUTHORS:20190424-141803208
- AST-0606772
- NSF
- AST-0907903
- NSF
- Created
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2019-04-24Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field