SN 2005df

SN 2005df was a Type Ia supernova in the barred spiral galaxy NGC 1559, which is located in the southern constellation of Reticulum. The event was discovered in Australia by Robert Evans on the early morning of August 5, 2005[3] with a 13.8 magnitude,[2] and was confirmed by A. Gilmore on August 6.[7] The supernova was classified as Type Ia by M. Salvo and associates.[8][5] It was positioned at an offset of 15.0″ east and 40.0″ north of the galaxy's nucleus,[2] reaching a maximum brightness of 12.3 on August 18.[7] The supernova luminosity appeared unreddened by dust from its host galaxy.[9]

SN 2005df
SN 2005df is visible as the bright star just above the galaxy at center[1]
Event typeSupernova
Type Ia[2]
DateAugust 4, 2005[2] (UTC)
ConstellationReticulum
Right ascension04h 17m 37.85s[3]
Declination−62° 46′ 09.5″[3]
EpochJ2000
Galactic coordinatesl = 274.49°, b = −41.2°[2]
Distance12.59 ± 0.20 Mpc (41.06 ± 0.65 Mly)[4]
Redshift0.0043[2]
HostNGC 1559[2]
Progenitor typewhite dwarf[5]
Notable featuresFirst supernovae observed in NGC 1559 since 1986; brightest of 2005.[6]
Peak apparent magnitude12.3[7]

The progenitor was a carbon-oxygen white dwarf close to the Chandrasekhar limit, making a merger scenario unlikely. Modelling of the explosion shows a low central density for a hydrogen accretion scenario, suggesting the donating companion was a helium star or a tidally-disrupted white dwarf. Alternatively, the progenitor may have undergone some form of central mixing.[5]

References
  1. "Celestial Blast in Bleak Reticulum". ESO Press Release. Retrieved 18 May 2012.
  2. Barbon, R.; et al. (2008). "Asiago Supernova Catalogue". CDS/ADC Collection of Electronic Catalogues. Bibcode:2008yCat....1.2024B.
  3. Evans, R.; Gilmore, A. (August 2005). Green, D. W. E. (ed.). "Supernovae 2005dd, 2005de, and 2005df". IAU Circular. 8580 (2): 2. Bibcode:2005IAUC.8580....2E.
  4. Tully, R. Brent; et al. (October 2013), "Cosmicflows-2: The Data", The Astronomical Journal, 146 (4): 25, arXiv:1307.7213, Bibcode:2013AJ....146...86T, doi:10.1088/0004-6256/146/4/86, S2CID 118494842, 86
  5. Diamond, Tiara R.; et al. (June 2015). "Late-time Near-infrared Observations of SN 2005df". The Astrophysical Journal. 806 (1): 16. arXiv:1410.6759. Bibcode:2015ApJ...806..107D. doi:10.1088/0004-637X/806/1/107. S2CID 118732067. 107.
  6. "List of Supernovae". Central Bureau for Astronomical Telegrams. International Astronomical Union. Retrieved 2021-12-02.
  7. Gerardy, Christopher L.; et al. (June 2007). "Signatures of Delayed Detonation, Asymmetry, and Electron Capture in the Mid-Infrared Spectra of Supernovae 2003hv and 2005df". The Astrophysical Journal. 661 (2): 995–1012. arXiv:astro-ph/0702117. Bibcode:2007ApJ...661..995G. doi:10.1086/516728. S2CID 14053348.
  8. Salvo, M.; et al. (August 2005). Green, D. W. E. (ed.). "Supernova 2005df in NGC 1559". IAU Circular. 8581 (2): 2. Bibcode:2005IAUC.8581....2S.
  9. Krisciunas, Kevin; Suntzeff, Nicholas B.; Espinoza, Juan; Gonzalez, David; Miranda, Alberto; Sanhueza, Pedro (December 2017). "Optical and Infrared Photometry of SN 2005df". Research Notes of the American Astronomical Society. 1 (1): 36. arXiv:1711.10345. Bibcode:2017RNAAS...1...36K. doi:10.3847/2515-5172/aa9f18. S2CID 119010500. 36.
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