Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-02
Astrophys.J.661:1013-1024,2007
Astronomy and Astrophysics
Astrophysics
Accepted version with numerous minor changes
Scientific paper
10.1086/516747
Direct identification of the progenitors of supernovae (SNe) is rare because of the required spatial resolution and depth of the archival data prior to the SN explosions. Here we report on the identification of the progenitors of two nearby SNe in the Virgo cluster: SN 2006my in NGC 4651 and SN 2006ov in M61. We obtained high-quality ground-based images of SN 2006my with the Canada-France-Hawaii Telescope, and are able to locate the site of the SN on pre-SN {\it Hubble Space Telescope} ({\it HST}) Wide Field Planetary Camera 2 images to a high precision (1$\sigma$ uncertainty of $\pm0\farcs$05). We pinpoint the site of SN 2006ov to within 0$\farcs$02 from {\it HST} Advanced Camera for Surveys images of the SN. We detected a red supergiant progenitor for each SN within the error circles, with an inferred zero-age main-sequence mass ($M_{\rm ZAMS}$) of $10^{+5}_{-3}$ $M_\odot$ and $15^{+5}_{-3}$ $M_\odot$ for the progenitors of SNe 2006my and 2006ov, respectively. The mass estimates for the progenitors of both SNe confirm a suggested trend that the most common Type II-plateau SNe originate from low-mass supergiants with $M_{\rm ZAMS} \approx 8$--20 $M_\odot$.
Cuillandre Jean Charles
Filippenko Alexei V.
Foley Ryan J.
Li Weidong
Van Dyk Schuyler D.
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