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Article: Preliminary spectral analysis of the type II supernova 1999em

TitlePreliminary spectral analysis of the type II supernova 1999em
Authors
KeywordsRadiative Transfer
Stars: Atmospheres
Supernovae: Individual (Sn 1999Em)
Issue Date2000
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2000, v. 545 n. 1 PART 1, p. 444-448 How to Cite?
AbstractWe have calculated fast direct spectral model fits to two early-time spectra of the Type II plateau SN 1999em, using the SYNOW synthetic spectrum code. The first is an extremely early blue optical spectrum and the second a combined Hubble Space Telescope and optical spectrum obtained one week later. Spectroscopically this supernova appears to be a normal Type II, and these fits are in excellent agreement with the observed spectra. Our direct analysis suggests the presence of enhanced nitrogen. We have further studied these spectra with the full non-LTE general model atmosphere code PHOENIX. While we do not find confirmation for enhanced nitrogen (nor do we rule it out), we do require enhanced helium. An even more intriguing possible line identification is complicated Balmer and He I lines, which we show falls naturally out of the detailed calculations with a shallow density gradient. We also show that very early spectra such as those presented here combined with sophisticated spectral modeling allow an independent estimate of the total reddening to the supernova, since when the spectrum is very blue, dereddening leads to changes in the blue flux that cannot be reproduced by altering the "temperature" of the emitted radiation. These results are extremely encouraging since they imply that detailed modeling of early spectra can shed light on both the abundances and total extinction of SNe II, the latter improving their utility and reliability as distance indicators.
Persistent Identifierhttp://hdl.handle.net/10722/174800
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
References

 

DC FieldValueLanguage
dc.contributor.authorBaron, Een_US
dc.contributor.authorBranch, Den_US
dc.contributor.authorHauschildt, PHen_US
dc.contributor.authorFilippenko, AVen_US
dc.contributor.authorKirshner, RPen_US
dc.contributor.authorChallis, PMen_US
dc.contributor.authorJha, Sen_US
dc.contributor.authorChevalier, Ren_US
dc.contributor.authorFransson, Cen_US
dc.contributor.authorLundqvist, Pen_US
dc.contributor.authorGarnavich, Pen_US
dc.contributor.authorLeibundgut, Ben_US
dc.contributor.authorMccray, Ren_US
dc.contributor.authorMichael, Een_US
dc.contributor.authorPanagia, Nen_US
dc.contributor.authorPhillips, MMen_US
dc.contributor.authorPun, CSJen_US
dc.contributor.authorSchmidt, Ben_US
dc.contributor.authorSonneborn, Gen_US
dc.contributor.authorSuntzeff, NBen_US
dc.contributor.authorWang, Len_US
dc.contributor.authorWheeler, JCen_US
dc.date.accessioned2012-11-26T08:47:31Z-
dc.date.available2012-11-26T08:47:31Z-
dc.date.issued2000en_US
dc.identifier.citationAstrophysical Journal Letters, 2000, v. 545 n. 1 PART 1, p. 444-448en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/174800-
dc.description.abstractWe have calculated fast direct spectral model fits to two early-time spectra of the Type II plateau SN 1999em, using the SYNOW synthetic spectrum code. The first is an extremely early blue optical spectrum and the second a combined Hubble Space Telescope and optical spectrum obtained one week later. Spectroscopically this supernova appears to be a normal Type II, and these fits are in excellent agreement with the observed spectra. Our direct analysis suggests the presence of enhanced nitrogen. We have further studied these spectra with the full non-LTE general model atmosphere code PHOENIX. While we do not find confirmation for enhanced nitrogen (nor do we rule it out), we do require enhanced helium. An even more intriguing possible line identification is complicated Balmer and He I lines, which we show falls naturally out of the detailed calculations with a shallow density gradient. We also show that very early spectra such as those presented here combined with sophisticated spectral modeling allow an independent estimate of the total reddening to the supernova, since when the spectrum is very blue, dereddening leads to changes in the blue flux that cannot be reproduced by altering the "temperature" of the emitted radiation. These results are extremely encouraging since they imply that detailed modeling of early spectra can shed light on both the abundances and total extinction of SNe II, the latter improving their utility and reliability as distance indicators.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectRadiative Transferen_US
dc.subjectStars: Atmospheresen_US
dc.subjectSupernovae: Individual (Sn 1999Em)en_US
dc.titlePreliminary spectral analysis of the type II supernova 1999emen_US
dc.typeArticleen_US
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_US
dc.identifier.authorityPun, CSJ=rp00772en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0034634948en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034634948&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume545en_US
dc.identifier.issue1 PART 1en_US
dc.identifier.spage444en_US
dc.identifier.epage448en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridBaron, E=7102558228en_US
dc.identifier.scopusauthoridBranch, D=7103272488en_US
dc.identifier.scopusauthoridHauschildt, PH=7006014053en_US
dc.identifier.scopusauthoridFilippenko, AV=34568722000en_US
dc.identifier.scopusauthoridKirshner, RP=35277140000en_US
dc.identifier.scopusauthoridChallis, PM=7004555495en_US
dc.identifier.scopusauthoridJha, S=7202726891en_US
dc.identifier.scopusauthoridChevalier, R=7101871369en_US
dc.identifier.scopusauthoridFransson, C=7004051800en_US
dc.identifier.scopusauthoridLundqvist, P=7004499555en_US
dc.identifier.scopusauthoridGarnavich, P=7006524172en_US
dc.identifier.scopusauthoridLeibundgut, B=7007116593en_US
dc.identifier.scopusauthoridMccray, R=35954431900en_US
dc.identifier.scopusauthoridMichael, E=7004899413en_US
dc.identifier.scopusauthoridPanagia, N=35400629400en_US
dc.identifier.scopusauthoridPhillips, MM=7402770160en_US
dc.identifier.scopusauthoridPun, CSJ=7003931846en_US
dc.identifier.scopusauthoridSchmidt, B=7402828523en_US
dc.identifier.scopusauthoridSonneborn, G=7006137500en_US
dc.identifier.scopusauthoridSuntzeff, NB=7006255654en_US
dc.identifier.scopusauthoridWang, L=46361955700en_US
dc.identifier.scopusauthoridWheeler, JC=7403110438en_US

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