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Article: Early re-brightenings in GRB afterglows as signatures of low-to-high density boundary

TitleEarly re-brightenings in GRB afterglows as signatures of low-to-high density boundary
Authors
KeywordsGamma rays: bursts
ISM: jets and outflows
Radiation mechanisms: non-thermal
Stars: winds
Issue Date2005
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/newast
Citation
New Astronomy, 2005, v. 10 n. 7, p. 535-544 How to Cite?
AbstractThe association of long gamma-ray bursts (GRBs) with star forming regions and the idea of massive stars as progenitors of GRBs are widely accepted. Because of their short lifetimes, it is very likely that massive stars are still embedded in dense molecular clouds when they give birth to GRBs. Stellar winds from GRB progenitors can create low-density bubbles with sizes and densities strongly depending on the initial ambient density. A boundary between the bubble and the dense molecular cloud must exist with the density at the boundary increasing from that of the bubble to that of the outer cloud. We have calculated the lightcurves of the afterglows in such environments with three regions: the stellar wind region, the boundary, and the molecular cloud. We show that the interaction between the cylindrical jet and the density boundary can result in a re-brightening of the afterglow occurring as early as ∼1 day after the GRB. We compare our models with the optical afterglows of GRB 970508, GRB 000301C, and GRB 030226. We find that the values of our model parameters, including the radius of the wind bubble, the densities in the bubble and in the outer molecular cloud are within typical ranges. © 2005 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/48662
ISSN
2015 Impact Factor: 1.085
2015 SCImago Journal Rankings: 0.657
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTam, PHen_HK
dc.contributor.authorPun, CSJen_HK
dc.contributor.authorHuang, YFen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2008-05-22T04:20:36Z-
dc.date.available2008-05-22T04:20:36Z-
dc.date.issued2005en_HK
dc.identifier.citationNew Astronomy, 2005, v. 10 n. 7, p. 535-544en_HK
dc.identifier.issn1384-1076en_HK
dc.identifier.urihttp://hdl.handle.net/10722/48662-
dc.description.abstractThe association of long gamma-ray bursts (GRBs) with star forming regions and the idea of massive stars as progenitors of GRBs are widely accepted. Because of their short lifetimes, it is very likely that massive stars are still embedded in dense molecular clouds when they give birth to GRBs. Stellar winds from GRB progenitors can create low-density bubbles with sizes and densities strongly depending on the initial ambient density. A boundary between the bubble and the dense molecular cloud must exist with the density at the boundary increasing from that of the bubble to that of the outer cloud. We have calculated the lightcurves of the afterglows in such environments with three regions: the stellar wind region, the boundary, and the molecular cloud. We show that the interaction between the cylindrical jet and the density boundary can result in a re-brightening of the afterglow occurring as early as ∼1 day after the GRB. We compare our models with the optical afterglows of GRB 970508, GRB 000301C, and GRB 030226. We find that the values of our model parameters, including the radius of the wind bubble, the densities in the bubble and in the outer molecular cloud are within typical ranges. © 2005 Elsevier B.V. All rights reserved.en_HK
dc.format.extent404387 bytes-
dc.format.extent2385 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/newasten_HK
dc.relation.ispartofNew Astronomyen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsNew Astronomy. Copyright © Elsevier BV.en_HK
dc.subjectGamma rays: burstsen_HK
dc.subjectISM: jets and outflowsen_HK
dc.subjectRadiation mechanisms: non-thermalen_HK
dc.subjectStars: windsen_HK
dc.titleEarly re-brightenings in GRB afterglows as signatures of low-to-high density boundaryen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1384-1076&volume=10&issue=7&spage=535&epage=544&date=2005&atitle=Early+re-brightenings+in+GRB+afterglows+as+signatures+of+low-to-high+density+boundary+en_HK
dc.identifier.emailPun, CSJ: jcspun@hkucc.hku.hken_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityPun, CSJ=rp00772en_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepostprinten_HK
dc.identifier.doi10.1016/j.newast.2005.03.003en_HK
dc.identifier.scopuseid_2-s2.0-19744363016en_HK
dc.identifier.hkuros98254-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-19744363016&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume10en_HK
dc.identifier.issue7en_HK
dc.identifier.spage535en_HK
dc.identifier.epage544en_HK
dc.identifier.isiWOS:000230114900001-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridTam, PH=35243989500en_HK
dc.identifier.scopusauthoridPun, CSJ=7003931846en_HK
dc.identifier.scopusauthoridHuang, YF=7501574835en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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