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Article: The axisymmetric ejecta of supernova 1987A

TitleThe axisymmetric ejecta of supernova 1987A
Authors
KeywordsSupernova remnants
Supernovae: individual (SN 1987A)
Issue Date2002
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2002, v. 579 n. 2 I, p. 671-677 How to Cite?
AbstractExtensive early observations proved that the ejecta of supernova 1987A (SN 1987A) are aspherical. The most important of these early observations include (1) the "Bochum event" that revealed small-scale spectroscopic structure indicating chemical inhomogeneities of the ejecta, (2) spectropolarimetry that showed deviations from spherical symmetry, and (3) speckle observations that revealed both the asymmetry of the ejecta and the "mystery spot" manifested as a secondary source off center from the bulk of the supernova ejecta. Fifteen years after the supernova explosion, the Hubble Space Telescope has resolved the rapidly expanding ejecta. The late-time images and spectroscopy provide a geometrical picture that is consistent with early observations and suggests a highly structured, axially symmetric geometry. We present here a new synthesis of the old and new data. We show that the Bochum event, presumably a clump of 56Ni, and the late-time image, the locus of excitation by 44Ti, are most naturally accounted for by sharing a common position angle of about 14°, the same as the mystery spot and early speckle data on the ejecta, and that they are both oriented along the axis of the inner circumstellar ring at 45° to the plane of the sky. We also demonstrate that the polarization represents a prolate geometry with the same position angle and axis as the early speckle data and the late-time image, and hence that the geometry has been fixed in time and throughout the ejecta. The Bochum event and the Doppler kinematics of the [Ca II]/[O -II] emission in spatially resolved Hubble Space Telescope spectra of the ejecta can be consistently integrated into this geometry. The radioactive clump is deduced to fall approximately along the axis of the inner circumstellar ring and therefore to be redshifted in the north, whereas the [Ca II]/[O II] 7300 Å emission is redshifted in the south. We present a jet-induced model for the explosion and argue that such a model can account for many of the observed asymmetries. In the jet models, the oxygen and calcium are not expected to be distributed along the jet but primarily in an expanding torus that shares the plane and northern blue shift of the inner circumstellar ring.
Persistent Identifierhttp://hdl.handle.net/10722/43393
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, Len_HK
dc.contributor.authorWheeler, JCen_HK
dc.contributor.authorHöflich, Pen_HK
dc.contributor.authorKhokhlov, Aen_HK
dc.contributor.authorBaade, Den_HK
dc.contributor.authorBranch, Den_HK
dc.contributor.authorChallis, Pen_HK
dc.contributor.authorFilippenko, AVen_HK
dc.contributor.authorFransson, Cen_HK
dc.contributor.authorGarnavich, Pen_HK
dc.contributor.authorKirshner, RPen_HK
dc.contributor.authorLundqvist, Pen_HK
dc.contributor.authorMcCray, Ren_HK
dc.contributor.authorPanagia, Nen_HK
dc.contributor.authorPun, CSJen_HK
dc.contributor.authorPhillips, MMen_HK
dc.contributor.authorSonneborn, Gen_HK
dc.contributor.authorSuntzeff, NBen_HK
dc.date.accessioned2007-03-23T04:44:51Z-
dc.date.available2007-03-23T04:44:51Z-
dc.date.issued2002en_HK
dc.identifier.citationAstrophysical Journal Letters, 2002, v. 579 n. 2 I, p. 671-677en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43393-
dc.description.abstractExtensive early observations proved that the ejecta of supernova 1987A (SN 1987A) are aspherical. The most important of these early observations include (1) the "Bochum event" that revealed small-scale spectroscopic structure indicating chemical inhomogeneities of the ejecta, (2) spectropolarimetry that showed deviations from spherical symmetry, and (3) speckle observations that revealed both the asymmetry of the ejecta and the "mystery spot" manifested as a secondary source off center from the bulk of the supernova ejecta. Fifteen years after the supernova explosion, the Hubble Space Telescope has resolved the rapidly expanding ejecta. The late-time images and spectroscopy provide a geometrical picture that is consistent with early observations and suggests a highly structured, axially symmetric geometry. We present here a new synthesis of the old and new data. We show that the Bochum event, presumably a clump of 56Ni, and the late-time image, the locus of excitation by 44Ti, are most naturally accounted for by sharing a common position angle of about 14°, the same as the mystery spot and early speckle data on the ejecta, and that they are both oriented along the axis of the inner circumstellar ring at 45° to the plane of the sky. We also demonstrate that the polarization represents a prolate geometry with the same position angle and axis as the early speckle data and the late-time image, and hence that the geometry has been fixed in time and throughout the ejecta. The Bochum event and the Doppler kinematics of the [Ca II]/[O -II] emission in spatially resolved Hubble Space Telescope spectra of the ejecta can be consistently integrated into this geometry. The radioactive clump is deduced to fall approximately along the axis of the inner circumstellar ring and therefore to be redshifted in the north, whereas the [Ca II]/[O II] 7300 Å emission is redshifted in the south. We present a jet-induced model for the explosion and argue that such a model can account for many of the observed asymmetries. In the jet models, the oxygen and calcium are not expected to be distributed along the jet but primarily in an expanding torus that shares the plane and northern blue shift of the inner circumstellar ring.en_HK
dc.format.extent501267 bytes-
dc.format.extent26624 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectSupernova remnantsen_HK
dc.subjectSupernovae: individual (SN 1987A)en_HK
dc.titleThe axisymmetric ejecta of supernova 1987Aen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=579&issue=2 pt 1&spage=671&epage=677&date=2002&atitle=The+Axisymmetric+Ejecta+of+Supernova+1987Aen_HK
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_HK
dc.identifier.authorityPun, CSJ=rp00772en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/342824en_HK
dc.identifier.scopuseid_2-s2.0-0037893101en_HK
dc.identifier.hkuros80652-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037893101&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume579en_HK
dc.identifier.issue2 Ien_HK
dc.identifier.spage671en_HK
dc.identifier.epage677en_HK
dc.identifier.isiWOS:000179062700019-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridWang, L=45361626600en_HK
dc.identifier.scopusauthoridWheeler, JC=7403110438en_HK
dc.identifier.scopusauthoridHöflich, P=34770585700en_HK
dc.identifier.scopusauthoridKhokhlov, A=7201743641en_HK
dc.identifier.scopusauthoridBaade, D=6701651525en_HK
dc.identifier.scopusauthoridBranch, D=7103272488en_HK
dc.identifier.scopusauthoridChallis, P=7004555495en_HK
dc.identifier.scopusauthoridFilippenko, AV=34568722000en_HK
dc.identifier.scopusauthoridFransson, C=7004051800en_HK
dc.identifier.scopusauthoridGarnavich, P=7006524172en_HK
dc.identifier.scopusauthoridKirshner, RP=35277140000en_HK
dc.identifier.scopusauthoridLundqvist, P=7004499555en_HK
dc.identifier.scopusauthoridMcCray, R=35954431900en_HK
dc.identifier.scopusauthoridPanagia, N=35400629400en_HK
dc.identifier.scopusauthoridPun, CSJ=7003931846en_HK
dc.identifier.scopusauthoridPhillips, MM=7402770160en_HK
dc.identifier.scopusauthoridSonneborn, G=7006137500en_HK
dc.identifier.scopusauthoridSuntzeff, NB=7006255654en_HK

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