Astronomy:SN 1994D

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Short description: Type Ia supernova in Virgo

Coordinates: Sky map 12h 34m 02.395s, +07° 42′ 05.70″

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
Spectral classType Ia[1]
Datec. 55.15 million years ago
(discovered 7 March 1994 by R. Treffers)[2]
InstrumentLeuschner Observatory
ConstellationVirgo
Right ascension 12h 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+11.9[3]
Preceded bySN 1994C[4]
Followed bySN 1994E[4]
[edit on Wikidata]

SN 1994D was a Type Ia supernova event in the outskirts of galaxy NGC 4526, which was observed in 1994.

Observation

Light curves in four photometric bands for SN 1994D, adapted from Richmond et al. (1995)[3]

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. ↑ 1.0 1.1 1.2 1.3 1.4 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. doi:10.1093/mnras/281.1.263. Bibcode: 1996MNRAS.281..263M. 
  2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 3.2 Richmond, Michael W.; Treffers, Richard R.; Filippenko, Alexei V.; van Dyk, Schuyler D.; Paik, Young; Peng, Chien; Marschall, Laurence A.; Laaksonen, Bentley D. et al. (May 1995). "UBVRI Photometry of the Type IA SN 1994D in NGC 4526". Astronomical Journal 109: 2121-2133. doi:10.1086/117437. Bibcode: 1995AJ....109.2121R. https://articles.adsabs.harvard.edu/pdf/1995AJ....109.2121R. Retrieved 25 May 2025. 
  4. ↑ 4.0 4.1 List of Supernovae, International Astronomical Union, http://www.cbat.eps.harvard.edu/lists/Supernovae.html, retrieved 2021-12-02. 
  5. ↑ 5.0 5.1 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. doi:10.1086/322239. Bibcode: 2001ApJ...557..266L. 
  6. ↑ Boyle, Aoife et al. (March 2017). "Helium in double-detonation models of type Ia supernovae". Astronomy & Astrophysics 599: 12. doi:10.1051/0004-6361/201629712. A46. Bibcode: 2017A&A...599A..46B. 

Further reading

  • Branch, David et al. (June 2005). "Comparative Direct Analysis of Type Ia Supernova Spectra. I. SN 1994D". The Publications of the Astronomical Society of the Pacific 117 (832): 545–552. doi:10.1086/430135. Bibcode: 2005PASP..117..545B. 



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