Discovery of two infrared supernovae: a new window on the SN search

Abstract

We report the discovery of two supernovae (SN 1999gw and SN 2001db) obtained within the framework of an infrared monitoring campaign of Luminous Infrared Galaxies, aimed at detecting obscured supernovae. SN 2001db, extinguished by Av~5.5 mag, is the first supernova discovered in the infrared which has received the spectroscopic confirmation. This result highlights the power of infrared monitoring in detecting obscured SNe and indicates that optical surveys are probably missing a significant fraction of SNe, especially in obscured systems such as starburst galaxies. The preliminary estimate of SN rate in LIRG galaxies is about an order of magnitude higher than that expected from optical surveys.

9 pages, 7 figures, accepted for publication in A&A

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• The Distance to SN 1999em from the Expanding Photosphere Method
• High Resolution Mid-Infrared Imaging of Infrared Luminous Starburst Galaxies
• The TNG Near Infrared Camera Spectrometer

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