SN 2005df

SN 2005df
SN 2005df is visible as the bright star just above the galaxy at center[1]
Event typeSupernova
Type Ia[2]
DateAugust 4, 2005[2] (UTC)
ConstellationReticulum
Right ascension04h 17m 37.85s[3]
Declination−62° 46′ 09.5″[3]
EpochJ2000
Galactic coordinatesl = 274.49°, b = −41.2°[2]
Distance12.59 ± 0.20 Mpc (41.06 ± 0.65 Mly)[4]
Redshift0.0043[2]
HostNGC 1559[2]
Progenitor typewhite dwarf[5]
Notable featuresFirst supernovae observed in NGC 1559 since 1986; brightest of 2005.[6]
Peak apparent magnitude12.3[7]
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SN 2005df was a Type Ia supernova in the barred spiral galaxy NGC 1559, which is located in the southern constellation of Reticulum. The event was discovered in Australia by Robert Evans on the early morning of August 5, 2005[3] with a 13.8 magnitude,[2] and was confirmed by A. Gilmore on August 6.[7] The supernova was classified as Type Ia by M. Salvo and associates.[8][5] It was positioned at an offset of 15.0″ east and 40.0″ north of the galaxy's nucleus,[2] reaching a maximum brightness of 12.3 on August 18.[7] The supernova luminosity appeared unreddened by dust from its host galaxy.[9]

The progenitor was a carbon-oxygen white dwarf close to the Chandrasekhar limit, making a merger scenario unlikely. Modelling of the explosion shows a low central density for a hydrogen accretion scenario, suggesting the donating companion was a helium star or a tidally-disrupted white dwarf. Alternatively, the progenitor may have undergone some form of central mixing.[5]

  1. ^ Cite error: The named reference ESO0527 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Barbon_et_al_2008 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Evans_Gilmore_2005 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Tully_et_al_2013 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Diamond_et_al_2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference IAU_CBAT was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Gerardy_et_al_2007 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Salvo_et_al_2005 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Krisciunas_et_al_2017 was invoked but never defined (see the help page).