Early formation of carbon monoxide in the Centaurus A supernova SN 2016adj
| Autor: | N. M. Ashok, Raja Rammohun Roy, Vishal Joshi, Jason Spyromilio, A. Evans, Robert D. Gehrz, Jeonghee Rho, Debabrata Banerjee, M. S. Connelley, Thomas R. Geballe, Mudit K. Srivastava |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
010308 nuclear & particles physics Centaurus A FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences chemistry.chemical_compound Supernova Astrophysics - Solar and Stellar Astrophysics chemistry Space and Planetary Science QB460 0103 physical sciences Spectroscopy 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Carbon monoxide |
| ISSN: | 1365-2966 |
| DOI: | 10.48550/arxiv.1808.04766 |
| Popis: | We present near-infrared spectroscopy of the NGC 5128 supernova SN 2016adj in the first 2 months following discovery. We report the detection of first overtone carbon monoxide emission at $\sim58.2$ d after discovery, one of the earliest detections of CO in an erupting supernova. We model the CO emission to derive the CO mass, temperature and velocity, assuming both pure $^{12}$CO and a composition that includes $^{13}$CO; the case for the latter is the isotopic analyses of meteoritic grains, which suggest that core collapse supernovae can synthesise significant amounts of $^{13}$C. Our models show that, while the CO data are adequately explained by pure $^{12}$CO, they do not preclude the presence of $^{13}$CO, to a limit of $^{12}$C/$^{13}$C $> 3$, the first constraint on the $^{12}$C/$^{13}$C ratio determined from near-infrared observations. We estimate the reddening to the object, and the effective temperature from the energy distribution at outburst. We discuss whether the ejecta of SN 2016adj may be carbon-rich, what the infrared data tell us about the classification of this supernova, and what implications the early formation of CO in supernovae may have for CO formation in supernovae in general. MNRAS, in press. Accepted 2018 August 13 |
| Databáze: | OpenAIRE |
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