Photometry of SN 2002bo with template image subtraction

¹ Department of Experimental Physics & Astronomical Observatory, University of Szeged, 6720 Szeged, Dóm tér 9., Hungary
² Guest Observer at Piszkéstető Station, Konkoly Observatory, Hungary
³ Department of Optics & Quantum Electronics & Astronomical Observatory, University of Szeged, POB 406, 6701 Szeged, Hungary

Corresponding author: Gy. M. Szabó, szgy@mcse.hu

Received: 3 June 2003
Accepted: 24 June 2003

Abstract

VRI photometry of the type Ia supernova 2002bo is presented. This SN exploded in a dusty region of the host galaxy NGC 3190, thus, subtraction of a template frame was necessary to obtain reliable photometry. We used a template frame of NGC 3190 taken during the course of our galaxy imaging project, fortunately, just a few days before SN 2002bo was discovered. The aim of this project is to collect template frames of nearby galaxies that are potential hosts of bright SNe. Subtraction of pre-SN images helped us to exclude the background light contamination of the host galaxy. The maximum occurred at JD 2 452 346, with maximal V brightness of 1358. MLCS analysis led to  = JD 2 452  (fiducial B-maximum), , , . indicates a significant extinction in the host galaxy as the galactic reddening is negligible toward NGC 3190. The accepted value of Δ indicates that SN 2002bo was a slightly overluminous SN by about 014 relative to fiducial SN type Ia. The distance turned out to be  Mpc. In addition, the heavily obscured SN 2002cv was also detected on the I frame taken on JD 2 452 434 (June 8, 2002), and a variable star is found in the field, very close to the host galaxy.