An IRS Spectrum of the Luminous Transient in NGC 300

Details An IRS Spectrum of the Luminous Transient in NGC 300 An IRS Spectrum of the Luminous Transient in NGC 300

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..487p&link_type=abstract

Spitzer Proposal ID #487

Computer Science

Scientific paper

We propose obtaining an IRS spectrum of the luminous transient discovered in the nearby galaxy NGC 300 on May 16, 2008. This transient shares remarkably similar properties with SN~2008S discovered earlier this year in NGC 6946: they have peak absolute magnitudes approx. -14, intermediate between bright novae and low-luminosity core-collapse supernovae, and optical spectra dominated by relatively broad Balmer lines in emission, similar to some type IIn supernovae and LBV outbursts. Most surprisingly, both transients had progenitors identified in Spitzer pre-explosion archival images as ~10 Msun stars enshrouded in their own optically-thick circumstellar dust. These transients, along with the luminous transient discovered in the Virgo galaxy M85 in 2006, are most likely part of a new class of stellar explosions/eruptions of dusty-massive stars unveiled by Spitzer observations. A low-resolution IRS spectrum will help us characterize the composition of its circumstellar dust and the nature of the explosion.

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