SN 1998aq
Event typeSupernova
Type Ia[1]
DateApril 13, 1998[2]
ConstellationUrsa Major
Right ascension11h 56m 25.87s[1]
Declination+55° 07′ 43.2″[1]
Distance70.38 ± 0.23 Mly (21.58 ± 0.07 Mpc)[3]
Redshift0.0004, 0.0003, 0.002 Edit this on Wikidata
HostNGC 3982[1]
Colour (B-V)−0.18[4] (peak)
Peak apparent magnitude12.36[1]

SN 1998aq is a nearby supernova located in the intermediate spiral galaxy NGC 3982, offset 18″ west and 7″ of the galactic nucleus. It was discovered April 13, 1998 by amateur astronomer Mark Armstrong[2] and was confirmed by fellow British amateur Ron Arbour; both members of the U.K. Supernova/Nova Patrol.[4] The event was not visible on a prior check by Armstrong made April 7.[5] It reached peak brightness on April 27, and 15 days later had declined by 1.14 magnitudes in the B (blue) band.[4]

Spectrum of SN1998aq, a Type Ia supernova, one day after maximum light in the B band[6]

Spectroscopic observations determined this was a Type Ia supernova event, and it became one of the best-studied supernova of its type, at least in the visual band.[4] An absorption feature of singly-ionized carbon was (probably) detected nine days before maximum, an indication of unburned ash left over from the original carbon-oxygen core of the progenitor white dwarf.[7] Brightness calibration using Cepheid variables in NGC 3982 gives a peak absolute magnitude estimate of at least −19.47±0.15 (assuming no extinction in the host galaxy).[8]

References

  1. 1 2 3 4 5 Barbon, R.; et al. (2008). Asiago Supernova Catalogue. Bibcode:2008yCat....1.2024B. {{cite book}}: |work= ignored (help)
  2. 1 2 Hurst, G. M.; et al. (April 1998). Green, D. W. E. (ed.). "Supernova 1998aq in NGC 3982". IAU Circular. 6875: 1. Bibcode:1998IAUC.6875....1H.
  3. ↑ 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.
  4. 1 2 3 4 Branch, David; et al. (September 2003). "Optical Spectra of the Type Ia Supernova 1998aq". The Astronomical Journal. 126 (3): 1489–1498. arXiv:astro-ph/0305321. Bibcode:2003AJ....126.1489B. doi:10.1086/377016. S2CID 14239562.
  5. ↑ Hewitt, N. (April 2000). "The first seven UK supernova discoveries". Journal of the British Astronomical Association. 110 (2): 65–79. Bibcode:2000JBAA..110...65H.
  6. ↑ Matheson, T.; et al. (2008). "Optical Spectroscopy of Type Ia Supernovae". Astronomical Journal. 135 (4): 1598–1615. arXiv:0803.1705. Bibcode:2008AJ....135.1598M. doi:10.1088/0004-6256/135/4/1598. S2CID 33156459.
  7. ↑ Parrent, Jerod T.; et al. (May 2011). "A Study of Carbon Features in Type Ia Supernova Spectra". The Astrophysical Journal. 732 (1): 15. arXiv:1103.1671. Bibcode:2011ApJ...732...30P. doi:10.1088/0004-637X/732/1/30. S2CID 119199279. 30.
  8. ↑ Saha, A.; et al. (November 2001). "Cepheid Calibration of the Peak Brightness of Type Ia Supernovae. XI. SN 1998aq in NGC 3982". The Astrophysical Journal. 562 (1): 314–336. arXiv:astro-ph/0107391. Bibcode:2001ApJ...562..314S. doi:10.1086/323529. S2CID 119364520.
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