Detection efficiency and photometry in supernova surveys - the Stockholm VIMOS Supernova Survey I

Abstract

The aim of the work presented in this paper is to test and optimise supernova detection methods based on the optimal image subtraction technique. The main focus is on applying the detection methods to wide field supernova imaging surveys and in particular to the Stockholm VIMOS Supernova Survey (SVISS). We have constructed a supernova detection pipeline for imaging surveys. The core of the pipeline is image subtraction using the ISIS 2.2 package. Using real data from the SVISS we simulate supernovae in the images, both inside and outside galaxies. The detection pipeline is then run on the simulated frames and the effects of image quality and subtraction parameters on the detection efficiency and photometric accuracy are studied. The pipeline allows efficient detection of faint supernovae in the deep imaging data. It also allows controlling and correcting for possible systematic effects in the SN detection and photometry. We find such a systematic effect in the form of a small systematic flux offset remaining at the positions of galaxies in the subtracted frames. This offset will not only affect the photometric accuracy of the survey, but also the detection efficiencies. Our study has shown that ISIS 2.2 works well for the SVISS data. We have found that the detection efficiency and photometric accuracy of the survey are affected by the stamp selection for the image subtraction and by host galaxy brightness. With our tools the subtraction results can be further optimised, any systematic effects can be controlled and photometric errors estimated, which is very important for the SVISS, as well as for future SN searches based on large imaging surveys such as Pan-STARRS and LSST.

17 pages, 10 figure, accepted for publication in A&A

References in corpus (22)

• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• A method for optimal image subtraction
• First Results from the X-ray and Optical Survey of the Chandra Deep Field South
• High Redshift Supernova Rates
• Supernova rates from the Southern inTermediate Redshift ESO Supernova Search (STRESS)
• The Type Ia Supernova Rate at z ~0.5 from the Supernova Legacy Survey
• Microlensing optical depth toward the Galactic Bulge using bright sources from OGLE-II
• Supernovae in the Subaru Deep Field: An Initial Sample, and Type Ia Rate, out to Redshift 1.6
• Death rate of massive stars at redshift ~0.3
• Image reduction pipeline for the detection of variable sources in highly crowded fields
• Supernova 1998bw - The final phases
• The Rate of Type Ia Supernovae at High Redshift
• Adaptive Optics Discovery of Supernova 2004ip in the Nuclear Regions of the Luminous Infrared Galaxy IRAS 18293-3413
• The nature of the mid-infrared population from optical identifications of the ELAIS-S1 sample
• A Spitzer Space Telescope study of SN 2002hh: an infrared echo from a Type IIP supernova
• Discovery of two infrared supernovae: a new window on the SN search
• Image-Subtraction Photometry of Variable Stars in the Globular Clusters NGC 6388 and NGC 6441
• The Transit Light Curve Project. IV. Five Transits of the Exoplanet OGLE-TR-10b
• Highly extinguished supernovae in the nuclear regions of starburst galaxies
• The NN2 Flux Difference Method for Constructing Variable Object Light Curves
• Unbiased reconstruction of the mass function using microlensing survey data
• Optimising Optimal Image Subtraction

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• EmpiriciSN: Re-sampling Observed Supernova/Host Galaxy Populations using an XD Gaussian Mixture Model
• Reverberation Mapping of IC4329A
• Radio monitoring of NGC 7469: Late time radio evolution of SN 2000ft and the circumnuclear starburst in NGC 7469
• The discovery and classification of 16 supernovae at high redshifts in ELAIS-S1 - the Stockholm VIMOS Supernova Survey II