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Article: HST-COS observations of hydrogen, helium, carbon, and nitrogen emission from the SN 1987A reverse shock

TitleHST-COS observations of hydrogen, helium, carbon, and nitrogen emission from the SN 1987A reverse shock
Authors
Keywordscircumstellar matter
shock waves
supernovae: individual (SN 1987A)
Issue Date2011
PublisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
Astrophysical Journal, 2011, v. 743 n. 2 How to Cite?
AbstractWe present the most sensitive ultraviolet observations of Supernova 1987A to date. Imaging spectroscopy from the Hubble Space Telescope-Cosmic Origins Spectrograph shows many narrow (Δv ∼ 300kms -1) emission lines from the circumstellar ring, broad (Δv ∼ 10-20 × 10 3kms -1) emission lines from the reverse shock, and ultraviolet continuum emission. The high signal-to-noise ratio (>40 per resolution element) broad Lyα emission is excited by soft X-ray and EUV heating of mostly neutral gas in the circumstellar ring and outer supernova debris. The ultraviolet continuum at λ > 1350 can be explained by H I two-photon (2s 2 S 1/2-1s 2 S 1/2) emission from the same region. We confirm our earlier, tentative detection of N V λ1240 emission from the reverse shock and present the first detections of broad He II λ1640, C IV λ1550, and N IV] λ1486 emission lines from the reverse shock. The helium abundance in the high-velocity material is He/H = 0.14 0.06. The N V/Hα line ratio requires partial ion-electron equilibration (T e/T p ≈ 0.14-0.35). We find that the N/C abundance ratio in the gas crossing the reverse shock is significantly higher than that in the circumstellar ring, a result that may be attributed to chemical stratification in the outer envelope of the supernova progenitor. The N/C abundance may have been stratified prior to the ring expulsion, or this result may indicate continued CNO processing in the progenitor subsequent to the expulsion of the circumstellar ring. © 2011. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/145576
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
Funding AgencyGrant Number
NASANNX08AC146
NAS5-98043
NAS5-26555
HST programGO 12241
NASA through a grant from the Space Telescope Science InstituteGO-12241
Funding Information:

We thank Svetozar Zhekov formaking his X-ray shock model available, and K.F. and S.V.P. thank James Green for enjoyable discussions about the spectroscopic imaging capabilities of COS. We thank Dave Arnett for helpful advice regarding progenitor envelope structure. This work was supported by NASA grants NNX08AC146 and NAS5-98043 to the University of Colorado at Boulder. Data were obtained as part of HST program GO 12241. Support for program GO-12241 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

References

 

DC FieldValueLanguage
dc.contributor.authorFrance, Ken_HK
dc.contributor.authorMcCray, Ren_HK
dc.contributor.authorPenton, SVen_HK
dc.contributor.authorKirshner, RPen_HK
dc.contributor.authorChallis, Pen_HK
dc.contributor.authorMartin Laming, Jen_HK
dc.contributor.authorBouchet, Pen_HK
dc.contributor.authorChevalier, Ren_HK
dc.contributor.authorGarnavich, PMen_HK
dc.contributor.authorFransson, Cen_HK
dc.contributor.authorHeng, Ken_HK
dc.contributor.authorLarsson, Jen_HK
dc.contributor.authorLawrence, Sen_HK
dc.contributor.authorLundqvist, Pen_HK
dc.contributor.authorPanagia, Nen_HK
dc.contributor.authorPun, CSJen_HK
dc.contributor.authorSmith, Nen_HK
dc.contributor.authorSollerman, Jen_HK
dc.contributor.authorSonneborn, Gen_HK
dc.contributor.authorSugerman, Ben_HK
dc.contributor.authorCraig Wheeler, Jen_HK
dc.date.accessioned2012-02-28T01:55:39Z-
dc.date.available2012-02-28T01:55:39Z-
dc.date.issued2011en_HK
dc.identifier.citationAstrophysical Journal, 2011, v. 743 n. 2en_HK
dc.identifier.issn0004-637Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/145576-
dc.description.abstractWe present the most sensitive ultraviolet observations of Supernova 1987A to date. Imaging spectroscopy from the Hubble Space Telescope-Cosmic Origins Spectrograph shows many narrow (Δv ∼ 300kms -1) emission lines from the circumstellar ring, broad (Δv ∼ 10-20 × 10 3kms -1) emission lines from the reverse shock, and ultraviolet continuum emission. The high signal-to-noise ratio (>40 per resolution element) broad Lyα emission is excited by soft X-ray and EUV heating of mostly neutral gas in the circumstellar ring and outer supernova debris. The ultraviolet continuum at λ > 1350 can be explained by H I two-photon (2s 2 S 1/2-1s 2 S 1/2) emission from the same region. We confirm our earlier, tentative detection of N V λ1240 emission from the reverse shock and present the first detections of broad He II λ1640, C IV λ1550, and N IV] λ1486 emission lines from the reverse shock. The helium abundance in the high-velocity material is He/H = 0.14 0.06. The N V/Hα line ratio requires partial ion-electron equilibration (T e/T p ≈ 0.14-0.35). We find that the N/C abundance ratio in the gas crossing the reverse shock is significantly higher than that in the circumstellar ring, a result that may be attributed to chemical stratification in the outer envelope of the supernova progenitor. The N/C abundance may have been stratified prior to the ring expulsion, or this result may indicate continued CNO processing in the progenitor subsequent to the expulsion of the circumstellar ring. © 2011. The American Astronomical Society. All rights reserved.en_HK
dc.languageengen_US
dc.publisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/en_HK
dc.relation.ispartofAstrophysical Journalen_HK
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectcircumstellar matteren_HK
dc.subjectshock wavesen_HK
dc.subjectsupernovae: individual (SN 1987A)en_HK
dc.titleHST-COS observations of hydrogen, helium, carbon, and nitrogen emission from the SN 1987A reverse shocken_HK
dc.typeArticleen_HK
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_HK
dc.identifier.authorityPun, CSJ=rp00772en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1088/0004-637X/743/2/186en_HK
dc.identifier.scopuseid_2-s2.0-83455255211en_HK
dc.identifier.hkuros198687en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-83455255211&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume743en_HK
dc.identifier.issue2en_HK
dc.identifier.isiWOS:000298178400088-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridFrance, K=7003729615en_HK
dc.identifier.scopusauthoridMcCray, R=35954431900en_HK
dc.identifier.scopusauthoridPenton, SV=6701427787en_HK
dc.identifier.scopusauthoridKirshner, RP=35277140000en_HK
dc.identifier.scopusauthoridChallis, P=7004555495en_HK
dc.identifier.scopusauthoridMartin Laming, J=6505875044en_HK
dc.identifier.scopusauthoridBouchet, P=7006076277en_HK
dc.identifier.scopusauthoridChevalier, R=7101871369en_HK
dc.identifier.scopusauthoridGarnavich, PM=7006524172en_HK
dc.identifier.scopusauthoridFransson, C=7004051800en_HK
dc.identifier.scopusauthoridHeng, K=23989037500en_HK
dc.identifier.scopusauthoridLarsson, J=16042791200en_HK
dc.identifier.scopusauthoridLawrence, S=7202646485en_HK
dc.identifier.scopusauthoridLundqvist, P=7004499555en_HK
dc.identifier.scopusauthoridPanagia, N=35400629400en_HK
dc.identifier.scopusauthoridPun, CSJ=7003931846en_HK
dc.identifier.scopusauthoridSmith, N=7403172437en_HK
dc.identifier.scopusauthoridSollerman, J=6603947073en_HK
dc.identifier.scopusauthoridSonneborn, G=7006137500en_HK
dc.identifier.scopusauthoridSugerman, B=9433763600en_HK
dc.identifier.scopusauthoridCraig Wheeler, J=26664357500en_HK

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