An Upper Mass Limit on a Red Supergiant Progenitor for the Type II-Plateau Supernova SN 2006my

Abstract

We analyze two pre-supernova (SN) and three post-SN high-resolution images of the site of the Type II-Plateau supernova SN 2006my in an effort to either detect the progenitor star or to constrain its properties. Following image registration, we find that an isolated stellar object is not detected at the location of SN 2006my in either of the two pre-SN images. In the first, an I-band image obtained with the Wide-Field and Planetary Camera 2 on board the Hubble Space Telescope, the offset between the SN 2006my location and a detected source ("Source 1") is too large: > 0.08", which corresponds to a confidence level of non-association of 96% from our most liberal estimates of the transformation and measurement uncertainties. In the second, a similarly obtained V-band image, a source is detected ("Source 2") that has overlap with the SN 2006my location but is definitively an extended object. Through artificial star tests carried out on the precise location of SN 2006my in the images, we derive a 3-sigma upper bound on the luminosity of a red supergiant that could have remained undetected in our pre-SN images of log L/L_Sun = 5.10, which translates to an upper bound on such a star's initial mass of 15 M_Sun from the STARS stellar evolutionary models. Although considered unlikely, we can not rule out the possibility that part of the light comprising Source 1, which exhibits a slight extension relative to other point sources in the image, or part of the light contributing to the extended Source 2, may be due to the progenitor of SN 2006my. Only additional, high-resolution observations of the site taken after SN 2006my has faded beyond detection can confirm or reject these possibilities.

arXiv commentMinor text changes from Version 1. Appendix added detailing the determination of confidence level of non-association of point sources in two registered astronomical images

References in corpus (17)

• WFPC2 Stellar Photometry with HSTphot
• Line formation in solar granulation: IV. [O I], OI and OH lines and the photospheric O abundance
• Presupernova Evolution of Rotating Massive Stars II: -- Evolution of the Surface Properties
• Oxygen and nitrogen abundances in nearby galaxies. Correlations between oxygen abundance and macroscopic properties
• The Charge Transfer Efficiency and Calibration of WFPC2
• Detection of a red supergiant progenitor star of a type II-plateau supernova
• The Progenitor of SN 2005cs in the Whirlpool Galaxy
• Identification of the Red Supergiant Progenitor of Supernova 2005cs: Do the Progenitors of Type II-P Supernovae Have Low Mass?
• The Cepheid Distance to NGC 1637: A Direct Test of the EPM Distance to SN 1999em
• Supernova Shock Breakout from a Red Supergiant
• On The Progenitor of the Type II-Plateau Supernova 2003gd in Messier 74
• The 3D Structure of the Virgo Cluster Region from Tully-Fisher and HI Data
• On the Progenitors of Two Type II-P Supernovae in the Virgo Cluster
• A more detailed look at the Opacities for Enriched Carbon and Oxygen Mixtures
• Ruling out a massive-assymptoic giant-branch star as the progenitor of supernova 2005cs
• A high angular-resolution search for the progenitor of the type Ic Supernova 2004gt
• HST Survey of Clusters in Nearby Galaxies. I. Detection and Photometry

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