SN 2007on

SN 2007on
Image of SN 2007on
Event typeSupernova
Type Ia
Date5 November 2007
InstrumentLa Silla Observatory
ConstellationEridanus
Right ascension03h 38m 50.90s[1]
Declination−35° 34′ 30.0″[1]
EpochJ2000
Distance61 Mly
Redshift0.0064, 0.0062, 0.0059, 0.0075 Edit this on Wikidata
HostNGC 1404
Progenitor type2 White dwarf
Other designationsSN 2007on
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SN 2007on was a Type Ia supernova that occurred in the elliptical galaxy NGC 1404,[2][1] a member of the Fornax Cluster, in November 2007. It is classified as a transitional or fast-declining Type Ia supernova, intermediate in properties between normal Type Ia events and subluminous SN 1991bg supernovae. SN 2007on is notable for its extensive multi-wavelength observations and for the detection of a possible supersoft X-ray progenitor system in pre-explosion Chandra X-ray Observatory images.[3][4][5][6][7][8]

Discovery and Host Galaxy

SN 2007on was discovered on 5 November 2007 by the 0.25 m TAROT robotic telescope at La Silla Observatory, Chile. It was located north of the nucleus of NGC 1404. The supernova was independently reported by several surveys and received designation SN 2007on.[4][3][9]

NGC 1404 is an elliptical galaxy in the Fornax Cluster at a distance of approximately 20 Mpc. The galaxy has an old stellar population (6–9 Gyr) and very low dust content, resulting in negligible host-galaxy reddening. The supernova exploded at a projected distance of ~8 kpc northwest of the galaxy’s center.[4][3]

Characteristics

Early spectra resembled those of SN 1991bg like events but with higher expansion velocities. Nebular spectra showed broad, double-peaked forbidden iron lines, suggesting a non-spherical distribution of ⁵⁶Ni. No evidence of circumstellar material or interaction was detected.[3]

References

  1. ^ a b c "Simbad - Object view". simbad.cds.unistra.fr. Retrieved 2025-11-20.
  2. ^ "2007on | Transient Name Server". www.wis-tns.org. Retrieved 2025-11-20.
  3. ^ a b c d Gall, C.; Stritzinger, M. D.; Ashall, C.; Baron, E.; Burns, C. R.; Hoeflich, P.; Hsiao, E. Y.; Mazzali, P. A.; Phillips, M. M.; Filippenko, A. V.; Anderson, J. P.; Benetti, S.; Brown, P. J.; Campillay, A.; Challis, P. (2018-03-01). "Two transitional type Ia supernovae located in the Fornax cluster member NGC 1404: SN 2007on and SN 2011iv". Astronomy & Astrophysics. 611: A58. arXiv:1707.03823. Bibcode:2018A&A...611A..58G. doi:10.1051/0004-6361/201730886. ISSN 0004-6361.
  4. ^ a b c "Chandra :: Photo Album :: SN 2007on in NGC 1404 :: February 13, 2008". chandra.harvard.edu. Retrieved 2025-11-20.
  5. ^ https://spacenews.com/possible-progenitor-of-special-supernova-type-detected/
  6. ^ Voss, Rasmus; Nelemans, Gijs (2008). "Discovery of the progenitor of the type Ia supernova 2007on". Nature. 451 (7180): 802–804. arXiv:0802.2082. Bibcode:2008Natur.451..802V. doi:10.1038/nature06602. PMID 18273013.
  7. ^ Schilling, Govert (2008-02-22). "Standard-Candle Supernova Confusion". Sky & Telescope. Retrieved 2025-11-20.
  8. ^ "Progenitors of type Ia supernovae". www.astro.ru.nl. Retrieved 2025-11-20.
  9. ^ Pollas, C.; Klotz, A. (2007). "Supernova 2007on in NGC 1404". Central Bureau Electronic Telegrams (1121): 1. Bibcode:2007CBET.1121....1P.

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