SN 2008ax

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SN 2008ax
SN2008axHunterWilson.jpg
Position of SN 2008ax in NGC 4490; image courtesy of Hunter Wilson
Event typeSupernova
Type Ib [1]
Date3 March 2008
Constellation Canes Venatici
Right ascension 12h 30m 40.80s [2]
Declination +41° 38′ 16.1″ [2]
Epoch J2000.0
Galactic coordinates b = 137.95°, l = +74.88° [2]
Distance31  Mly (9.6  Mpc) [3]
SourceNGC 4490
Peak apparent magnitude +13.0 [4]
[ edit on Wikidata]

SN 2008ax was a helium-rich type Ib core-collapse supernova in the interacting galaxy NGC 4490. [3] It was independently discovered on 3 March 2008 by LOSS [5] and 4 March by Koichi Itagaki. [6] The site had been monitored six hours before discovery, thus constraining the time of the explosion breakout. [3] It was the third-brightest supernova of 2008. [7] The brightness in the B-band peaked about 20 days after the explosion. [3] X-ray emissions were detected from the event, which are most likely the result of shock heating from the supernova ejecta and circumstellar material. [8]

Images of the source location made using the Hubble Space Telescope in 2011 and 2013 were used to identify the progenitor. If it was a single star, the images are compatible with a supergiant star with a class of B to mid-A type. However, this is not favored by models which indicate the progenitor had a relatively low mass of 4–5  M☉ and extended hydrogen-rich atmosphere with a radius of 30–40  R☉ . An alternative, more plausible model suggests the progenitor was part of an interacting binary system where much of the atmosphere was lost through mass transfer to the companion. [1]

Related Research Articles

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<span class="mw-page-title-main">Superluminous supernova</span> Supernova at least ten times more luminous than a standard supernova

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<span class="mw-page-title-main">NGC 5806</span> Spiral galaxy in the constellation Virgo

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<span class="mw-page-title-main">NGC 6384</span> Galaxy in the constellation of Ophiucus

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<span class="mw-page-title-main">NGC 613</span> Galaxy in the constellation of Sculptor

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<span class="mw-page-title-main">NGC 4424</span> Spiral galaxy in the constellation Virgo

NGC 4424 is a spiral galaxy located in the equatorial constellation of Virgo. It was discovered February 27, 1865 by German astronomer Heinrich Louis d'Arrest. This galaxy is located at a distance of 13.5 million light years and is receding with a heliocentric radial velocity of 442 km/s. It has a morphological class of SB(s)a, which normally indicates a spiral galaxy with a barred structure (SB), no inner ring feature (s), and tightly-wound spiral arms (a). The galactic plane is inclined at an angle of 62° to the line of sight from the Earth. It is a likely member of the Virgo Cluster of galaxies.

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<span class="mw-page-title-main">NGC 6951</span> Galaxy in the constellation Cepheus

NGC 6951 is a barred spiral galaxy located in the constellation Cepheus. It is located at a distance of about 75 million light-years from Earth, which, given its apparent dimensions, means that NGC 6951 is about 100,000 light-years across. It was discovered by Jérôme Eugène Coggia in 1877 and independently by Lewis Swift in 1878.

References

  1. 1 2 Folatelli, Gastón; et al. (October 2015). "The Progenitor of the Type IIb SN 2008ax Revisited". The Astrophysical Journal. 811 (2): 13. arXiv: 1509.01588 . Bibcode:2015ApJ...811..147F. doi:10.1088/0004-637X/811/2/147. S2CID   53463754. 147.
  2. 1 2 3 Drake, A. J.; et al. (May 2009). "First Results from the Catalina Real-Time Transient Survey". The Astrophysical Journal. 696 (1): 870–884. arXiv: 0809.1394 . Bibcode:2009ApJ...696..870D. doi:10.1088/0004-637X/696/1/870. S2CID   7530040.
  3. 1 2 3 4 Pastorello, A.; et al. (September 2008). "The Type IIb SN 2008ax: spectral and light curve evolution". Monthly Notices of the Royal Astronomical Society. 389 (2): 955–966. arXiv: 0805.1914 . Bibcode:2008MNRAS.389..955P. doi:10.1111/j.1365-2966.2008.13618.x. S2CID   16483475.
  4. ↑ David Bishop. "Supernova 2008ax in NGC 4490". supernovae.net (International Supernovae Network). Archived from the original on 8 April 2010. Retrieved 7 June 2010.
  5. ↑ Mostardi, R.; et al. (March 2008). Green, D. W. E. (ed.). "Possible Supernova in NGC 4490". Central Bureau Electronic Telegrams. 1280 (1): 1. Bibcode:2008CBET.1280....1M.
  6. ↑ Nakano, S. (March 2008). Green, D. W. E. (ed.). "Supernova 2008ax in NGC 4490". Central Bureau Electronic Telegrams. 1286 (1): 1. Bibcode:2008CBET.1286....1N.
  7. ↑ David Bishop. "Bright Supernovae - 2008". supernovae.net (International Supernovae Network). Archived from the original on 27 September 2011. Retrieved 7 June 2010.
  8. ↑ Roming, P. W. A.; et al. (October 2009). "Multi-Wavelength Properties of the Type IIb SN 2008ax". The Astrophysical Journal Letters. 704 (2): L118–L123. arXiv: 0909.0967 . Bibcode:2009ApJ...704L.118R. doi:10.1088/0004-637X/704/2/L118. S2CID   51315301.
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