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SN2008jb: A "lost" core-collapse supernova in a star-forming dwarf galaxy at ~10 Mpc

Prieto, J L; Lee, J C; Drake, A J; McNaught, Rob; Garradd, G; Beacom, J F; Beshore, E; Catelan, M; Djorgovski, S G; Pojmanski, G; Stanek, K Z; Szczygiel, D M

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We present the discovery and follow-up observations of SN2008jb, a core-collapse supernova in the southern dwarf irregular galaxy ESO 302-14 (MB = -15.3mag) at 9.6Mpc. This nearby transient was missed by galaxy-targeted surveys and was only found in archival optical images obtained by the Catalina Real-time Transient Survey and the All-Sky Automated Survey. The well-sampled archival photometry shows that SN2008jb was detected shortly after explosion and reached a bright optical maximum, Vmax ≃...[Show more]

dc.contributor.authorPrieto, J L
dc.contributor.authorLee, J C
dc.contributor.authorDrake, A J
dc.contributor.authorMcNaught, Rob
dc.contributor.authorGarradd, G
dc.contributor.authorBeacom, J F
dc.contributor.authorBeshore, E
dc.contributor.authorCatelan, M
dc.contributor.authorDjorgovski, S G
dc.contributor.authorPojmanski, G
dc.contributor.authorStanek, K Z
dc.contributor.authorSzczygiel, D M
dc.date.accessioned2015-12-10T23:07:00Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/62904
dc.description.abstractWe present the discovery and follow-up observations of SN2008jb, a core-collapse supernova in the southern dwarf irregular galaxy ESO 302-14 (MB = -15.3mag) at 9.6Mpc. This nearby transient was missed by galaxy-targeted surveys and was only found in archival optical images obtained by the Catalina Real-time Transient Survey and the All-Sky Automated Survey. The well-sampled archival photometry shows that SN2008jb was detected shortly after explosion and reached a bright optical maximum, Vmax ≃ 13.6mag (MV, max ≃ -16.5). The shape of the light curve shows a plateau of 100days, followed by a drop of 1.4mag in the V band to a slow decline with an approximate56Co decay slope. The late-time light curve is consistent with 0.04 ± 0.01 Mω of56Ni synthesized in the explosion. A spectrum of the supernova obtained two years after explosion shows a broad, boxy Hα emission line, which is unusual for normal TypeII-Plateau supernovae at late times. We detect the supernova in archival Spitzer and WISE images obtained 8-14 months after explosion, which show clear signs of warm (600-700 K) dust emission. The dwarf irregular host galaxy, ESO 302-14, has a low gas-phase oxygen abundance, 12 + log(O/H) = 8.2 (1/5 Zω), similar to those of the Small Magellanic Cloud and the hosts of long gamma-ray bursts and luminous core-collapse supernovae. This metallicity is one of the lowest among local (≲ 10Mpc) supernova hosts. We study the host environment using GALEX far-UV, R-band, and Hα images and find that the supernova occurred in a large star formation complex. The morphology of the Hα emission appears as a large shell (R ≃ 350pc) surrounding the FUV and optical emission. Using the Hα-to-FUV ratio and FUV and R-band luminosities, we estimate an age of 9Myr and a total mass of 2 × 105 Mω for the star formation complex, assuming a single-age starburst. These properties are consistent with the expanding Hα supershells observed in many well-studied nearby dwarf galaxies, which are tell-tale signs of feedback from the cumulative effect of massive star winds and supernovae. The age estimated for the star-forming region where SN2008jb exploded suggests a relatively high-mass progenitor star with an initial mass M 20 Mω and warrants further study. We discuss the implications of these findings in the study of core-collapse supernova progenitors.
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: galaxies: dwarf; supernovae: general; supernovae: individual (SN 2008jb)
dc.titleSN2008jb: A "lost" core-collapse supernova in a star-forming dwarf galaxy at ~10 Mpc
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume745
dc.date.issued2012
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationf5625xPUB749
local.type.statusPublished Version
local.contributor.affiliationPrieto, J L, Carnegie Observatories
local.contributor.affiliationLee, J C, Carnegie Observatories
local.contributor.affiliationDrake, A J, California Institute of Technology
local.contributor.affiliationMcNaught, Rob, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGarradd, G, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBeacom, J F, The Ohio State University
local.contributor.affiliationBeshore, E, The University of Arizona
local.contributor.affiliationCatelan, M, Pontificia Universidad Catolica de Chile
local.contributor.affiliationDjorgovski, S G, California Institute of Technology
local.contributor.affiliationPojmanski, G, Warsaw University Astronomical Observatory
local.contributor.affiliationStanek, K Z, The Ohio State University
local.contributor.affiliationSzczygiel, D M, The Ohio State University
local.description.embargo2037-12-31
local.bibliographicCitation.issue1
local.identifier.doi10.1088/0004-637X/745/1/70
dc.date.updated2016-02-24T09:35:15Z
local.identifier.scopusID2-s2.0-84862956368
local.identifier.thomsonID000306140600052
CollectionsANU Research Publications

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