{
  "submitter": "Krzysztof Z. Stanek at CfA  <kstanek@cfa.harvard.edu>",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "body": "J. L. Prieto (Ohio State) reports:\n\nThe host galaxy of SN 2008D, NGC 2770, is included in the latest version\nof our catalog of supernova hosts:\n\nhttp://www.astronomy.ohio-state.edu/~prieto/snhosts/sort_name.html#2008D\n\nThe central oxygen abundance of NGC 2770, as measured by Tremonti et al.\n(2004, ApJ, 613, 898) using nebular emission lines, is 12 + log(O/H) = 9.0\nand its absolute magnitude is MB = -20.7 (HyperLeda catalog), putting this\nSc galaxy on the luminosity-metallicity relationship of star forming\ngalaxies (e.g., Tremonti et al. 2004). These characteristics are typical\nof the hosts of other type Ib/c supernovae (Prieto, Stanek & Beacom 2008,\nApJ, in press, arXiv: 0707.0690), and in contrast with the low-metallicity\nof the hosts of long-GRBs with supernovae (e.g., Stanek et al. 2006, AcA,\n56, 333). We note, however, that SN 2008D exploded fairly far from the\ncenter of NGC2770 (galactocentric distance of ~10kpc), which may have a\nstrong metallicity gradient, as suggested by its late-type Sc\nclassification. From the measured radial metallicity gradients of galaxies\nwith similar morphological class (Zaritsky, Kennicutt, & Huchra 1994, ApJ,\n420, 87), we estimate an oxygen abundance of 8.4 < 12 + log(O/H) < 8.8 (in\nthe scale of Tremonti et al.) at the site of the supernova explosion. Even\nthough this is only an approximation, this value is consistent with the\nmetallicities measured at the sites of broad-lined SN Ic without GRBs\n(Modjaz et al. 2008, AJ, in press, astro-ph/0701246).\n\nIndepently of the true nature of the X-ray transient associated with the\npeculiar type Ic supernova 2008D (e.g., Blondin et al., CBET 1205), an XRF\nor shock breakout (Burrows et al., GCN Circ. 7179), its remarkable\nstar-forming host, NGC 2770, deserves to be studied in detail: it has\nproduced three supernovae of type Ib/c in less than 10 years (SN 1999eh,\n2007uy, and 2008D), which most likely result from death of very massive\nstars (mass > 30 Msun, e.g., Heger et al. 2003, ApJ, 591, 288).\n\nThis message may be cited.",
  "subject": "Transient 080109/ SN 2008D, metallicity of the host galaxy",
  "createdOn": 1200515974000,
  "circularId": 7189,
  "eventId": "SN 2008D",
  "bibcode": "2008GCN..7189....1P",
  "email": "kstanek@cfa.harvard.edu",
  "editedOn": 1777053126348,
  "version": 2
}