SN 1994D

SN 1994D
A dusty spiral galaxy seen close to edge-on against a black background, with a bright point of white at lower left
Hubble Space Telescope image of SN 1994D, visible at lower left
Event typeSupernova
Type Ia[1]
Datec. 55.15 million years ago
(discovered 7 March 1994 by R. Treffers)[2]
InstrumentLeuschner Observatory
ConstellationVirgo
Right ascension12h 34m 02.395s[1]
Declination+07° 42′ 05.70″[1]
EpochB2000.0
Distance~55.15 million ly
Redshift0.0036, 0.0001, −0.0001, 0.0021, 0.0023, 0.0022, 0.0008, 0.0005, 0.0013, 0.0017, 0.0004, 0.0024, 0.0011, 0.0012, 0.0002
HostNGC 4526[2]
Progenitor typeWhite dwarf
Peak apparent magnitude+15.2
Other designationsSN 1994D, AAVSO 1229+08
Preceded bySN 1994C[3]
Followed bySN 1994E[3]
[edit on Wikidata]

SN 1994D was a Type Ia supernova event in the outskirts of galaxy NGC 4526. It was offset by 9.0″ west and 7.8″ south of the galaxy center and positioned near a prominent dust lane.[1] It was caused by the explosion of a white dwarf star composed of carbon and oxygen.[4] This event was discovered on March 7, 1994 by R. R. Treffers and associates using the automated 30-inch telescope at Leuschner Observatory.[2] It reached peak visual brightness two weeks later on March 22.[4] Modelling of the light curve indicates the explosion would have been visible around March 3-4. A possible detection of helium in the spectrum was made by W. P. S. Meikle and associates in 1996.[1] A mass of 0.014 to 0.03 M☉ in helium would be needed to produce this feature.[5]

See also

References

  1. ^ a b c d e Meikle, W. P. S.; et al. (July 1996). "An early-time infrared and optical study of the Type IA supernovae SN 1994D and 1991T". Monthly Notices of the Royal Astronomical Society. 281 (1): 263–280. Bibcode:1996MNRAS.281..263M. doi:10.1093/mnras/281.1.263.
  2. ^ a b c Treffers, R. R.; Filippenko, A. V.; van Dyk, S. D.; Richmond, M. W.; et al. (1994). Green, D. W. E. (ed.). "Supernova 1994D in NGC 4526". IAU Circular. 5946: 2. Bibcode:1994IAUC.5946....2T.
  3. ^ a b "List of Supernovae", Central Bureau for Astronomical Telegrams, International Astronomical Union, retrieved 2021-12-02.
  4. ^ a b Lentz, Eric J.; et al. (August 2001). "Non-LTE Synthetic Spectral Fits to the Type Ia Supernova 1994D in NGC 4526". The Astrophysical Journal. 557 (1): 266–278. arXiv:astro-ph/0104225. Bibcode:2001ApJ...557..266L. doi:10.1086/322239. S2CID 119535927.
  5. ^ Boyle, Aoife; et al. (March 2017). "Helium in double-detonation models of type Ia supernovae". Astronomy & Astrophysics. 599: 12. arXiv:1611.05938. Bibcode:2017A&A...599A..46B. doi:10.1051/0004-6361/201629712. S2CID 55621728. A46.

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