SN 1998bw

Last updated
SN 1998bw
SN 1998bw.jpg
Type Ic
Date26 April 1998
Constellation Telescopium
Right ascension 19h 35m 03.30s
Declination 52° 50 45.9
Galactic coordinates 344.99°, −27.72°
Redshift 0.0085  OOjs UI icon edit-ltr-progressive.svg
Host ESO 184-G82
Other designationsSN 1998bw, AAVSO 1927-53, GRB 980425

SN 1998bw was a rare broad-lined Type Ic [1] gamma ray burst supernova detected on 26 April 1998 in the ESO 184-G82 spiral galaxy, which some astronomers believe may be an example of a collapsar (hypernova). [2] The hypernova has been linked to GRB 980425, which was detected on 25 April 1998, the first time a gamma-ray burst has been linked to a supernova. [3] The hypernova is approximately 140 million light years away, very close for a gamma ray burst source. [4]

The region of the galaxy where the supernova occurred hosts stars 5-8 million years old and is relatively free from dust. A nearby region hosts multiple Wolf-Rayet stars less than 3 million years old, but it is unlikely that the supernova progenitor could be a runaway from that region. The implication is that the progenitor was a star originally 25-40 M if it exploded as a single star at the end of its life. [5]

Related Research Articles

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<span class="mw-page-title-main">SN 1987A</span> 1987 supernova event in the constellation Dorado

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<span class="mw-page-title-main">Gamma-ray burst</span> Flashes of gamma rays from distant galaxies

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<span class="mw-page-title-main">Type Ia supernova</span> Type of supernova in binary systems

A Type Ia supernova is a type of supernova that occurs in binary systems in which one of the stars is a white dwarf. The other star can be anything from a giant star to an even smaller white dwarf.

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<span class="mw-page-title-main">Type Ib and Ic supernovae</span> Types of supernovae caused by a star collapsing

Type Ib and Type Ic supernovae are categories of supernovae that are caused by the stellar core collapse of massive stars. These stars have shed or been stripped of their outer envelope of hydrogen, and, when compared to the spectrum of Type Ia supernovae, they lack the absorption line of silicon. Compared to Type Ib, Type Ic supernovae are hypothesized to have lost more of their initial envelope, including most of their helium. The two types are usually referred to as stripped core-collapse supernovae.

<span class="mw-page-title-main">Pair-instability supernova</span> Type of high-energy supernova in very large stars

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<span class="mw-page-title-main">Gamma-ray burst progenitors</span> Types of celestial objects that can emit gamma-ray bursts

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<span class="mw-page-title-main">SN 2014J</span> Supernova in Messier 82

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<span class="mw-page-title-main">Hypernova</span> Supernova that ejects a large mass at unusually high velocity

A hypernova is a very energetic supernova which is believed to result from an extreme core collapse scenario. In this case, a massive star collapses to form a rotating black hole emitting twin astrophysical jets and surrounded by an accretion disk. It is a type of stellar explosion that ejects material with an unusually high kinetic energy, an order of magnitude higher than most supernovae, with a luminosity at least 10 times greater. Hypernovae release such intense gamma rays that they often appear similar to a type Ic supernova, but with unusually broad spectral lines indicating an extremely high expansion velocity. Hypernovae are one of the mechanisms for producing long gamma ray bursts (GRBs), which range from 2 seconds to over a minute in duration. They have also been referred to as superluminous supernovae, though that classification also includes other types of extremely luminous stellar explosions that have different origins.

Ken'ichi Nomoto is a Japanese astrophysicist and astronomer, known for his research on stellar evolution, supernovae, and the origin of heavy elements.

References

  1. Woosley, S. E.; Eastman, Ronald G.; Schmidt, Brian P. (1999). "Gamma-Ray Bursts and Type Ic Supernova SN 1998bw" (PDF). The Astrophysical Journal. 516 (2): 788–796. arXiv: astro-ph/9806299 . Bibcode:1999ApJ...516..788W. doi:10.1086/307131. hdl:1885/94504. S2CID   17690696. Archived from the original (PDF) on 2016-09-18. Retrieved 2014-12-03.
  2. "Gamma-ray Burst 980425" . Retrieved June 11, 2017.
  3. Vreeswijk, P.; Tanvir, N.; Galama, T. (2000). "Gamma-Ray Burst Afterglows: Surprises from the Sky". The ING Newsletter. 2: 5. Bibcode:2000INGN....2....5V . Retrieved 2014-08-27.
  4. "A Strange Supernova with a Gamma-Ray Burst". European Southern Observatory. Retrieved 2015-11-14.
  5. Krühler, Thomas; Kuncarayakti, Hanindyo; Schady, Patricia; Anderson, Joseph P.; Galbany, Lluís; Gensior, Jindra (2017). "Hot gas around SN 1998bw - Inferring the progenitor from its environment". Astronomy & Astrophysics. 602 (85): A85. arXiv: 1702.05430 . Bibcode:2017A&A...602A..85K. doi:10.1051/0004-6361/201630268. S2CID   54903796.