SN 1994D

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SN 1994D
SN1994D.jpg
Hubble Space Telescope image of SN 1994D, visible at lower left
Event type Supernova
Type Ia [1]
Datec. 55.15 million years ago
(discovered 7 March 1994 by R. Treffers) [2]
Instrument Leuschner Observatory
Constellation Virgo
Right ascension 12h 34m 02.395s [1]
Declination +07° 42′ 05.70″ [1]
Epoch B2000.0
Distance~55.15 million ly
Redshift 0.0036, 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
Host NGC 4526 [2]
Progenitor type White dwarf
Peak apparent magnitude +11.9 [3]
Other designationsSN 1994D, AAVSO 1229+08
Preceded by SN 1994C [4]
Followed by SN 1994E [4]
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SN 1994D was a Type Ia supernova event in the outskirts of galaxy NGC 4526, which was observed in 1994.

Contents

Observation

Light curves in four photometric bands for SN 1994D, adapted from Richmond et al. (1995) SN1994DLightCurve.png
Light curves in four photometric bands for SN 1994D, adapted from Richmond et al. (1995)

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. [5] 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, magnitude 11.9, two weeks later on March 22. [5] [3] 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. [6]

See also

References

  1. 1 2 3 4 5 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. 1 2 3 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. 1 2 3 Richmond, Michael W.; Treffers, Richard R.; Filippenko, Alexei V.; van Dyk, Schuyler D.; Paik, Young; Peng, Chien; Marschall, Laurence A.; Laaksonen, Bentley D.; Macintosh, Bruce; McLean, Ian S. (May 1995). "UBVRI Photometry of the Type IA SN 1994D in NGC 4526". Astronomical Journal. 109: 2121–2133. Bibcode:1995AJ....109.2121R. doi:10.1086/117437 . Retrieved 25 May 2025.
  4. 1 2 "List of Supernovae", Central Bureau for Astronomical Telegrams, International Astronomical Union, retrieved 2021-12-02.
  5. 1 2 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.
  6. ↑ 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.

Further reading

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