An HST Search for the Progenitor of the Type Ib Supernova 2010O in NGC 3690/Arp 299

Astronomy and Astrophysics – Astronomy

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Several progenitor stars of Type II supernovae (SNe) have been identified in archival pre-explosion HST images. All of them are consistent with being red supergiants, as had been expected but never actually confirmed until the advent of HST imaging.
The hydrogen-deficient Type Ib and Ic SNe are in a less satisfactory state. They are believed to be core-collapse SNe arising from massive stars that have lost their H envelopes. Unfortunately, however, there has never been an identified progenitor of an SN Ib or Ic, so it remains uncertain whether they are massive Wolf-Rayet stars, or less-massive stars in interacting binaries.
The Type Ib SN 2010O was discovered by the amateur members of our team. It appeared in the starburst interacting galaxy NGC 3690 (Arp 299). It offers a tantalizing new opportunity, because NGC 3690 has been the subject of very extensive HST observations, ranging from the UV and optical to the near-IR, obtained before the outburst. SN 2010O is also interesting because of its close proximity to a variable X-ray source discovered by our team in pre-explosion Chandra images, which may support the interacting-binary scenario.
We imaged SN 2010O with the HST's Wide Field Planetary Camera 3 in June 2010. We find that it lies close to, but not within, a young compact cluster. There is no conspicuous optical progenitor star in the pre-outburst HST images.
We will discuss the implications for the progenitor objects of Type Ib supernovae.
Funding from STScI is gratefully acknowledged.

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