Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30885
DC Field | Value | Language |
---|---|---|
dc.contributor.author | CIOLFI, RICCARDO | en_US |
dc.contributor.author | Siegel, Daniel M. | en_US |
dc.date.accessioned | 2021-04-23T13:45:40Z | - |
dc.date.available | 2021-04-23T13:45:40Z | - |
dc.date.issued | 2015 | en_US |
dc.identifier.issn | 2041-8205 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30885 | - |
dc.description.abstract | Short gamma-ray bursts (SGRBs) are among the most luminous explosions in the universe and their origin still remains uncertain. Observational evidence favors the association with binary neutron star or neutron star-black hole (NS-BH) binary mergers. Leading models relate SGRBs to a relativistic jet launched by the BH-torus system resulting from the merger. However, recent observations have revealed a large fraction of SGRB events accompanied by X-ray afterglows with durations ~10<SUP>2</SUP>-10<SUP>5</SUP> s, suggesting continuous energy injection from a long-lived central engine, which is incompatible with the short (lsim 1 s) accretion timescale of a BH-torus system. The formation of a supramassive NS, resisting the collapse on much longer spin-down timescales, can explain these afterglow durations, but leaves serious doubts on whether a relativistic jet can be launched at the merger. Here we present a novel scenario accommodating both aspects, where the SGRB is produced after the collapse of a supramassive NS. Early differential rotation and subsequent spin-down emission generate an optically thick environment around the NS consisting of a photon-pair nebula and an outer shell of baryon-loaded ejecta. While the jet easily drills through this environment, spin-down radiation diffuses outward on much longer timescales and accumulates a delay that allows the SGRB to be observed before (part of) the long-lasting X-ray signal. By analyzing diffusion timescales for a wide range of physical parameters, we find delays that can generally reach ~10<SUP>5</SUP> s, compatible with observations. The success of this fundamental test makes this "time-reversal" scenario an attractive alternative to current SGRB models. | en_US |
dc.language.iso | eng | en_US |
dc.title | Short Gamma-Ray Bursts in the "Time-reversal" Scenario | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1088/2041-8205/798/2/L36 | en_US |
dc.identifier.scopus | 2-s2.0-84920860011 | en_US |
dc.identifier.isi | WOS:000347463300010 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.1088/2041-8205/798/2/L36/meta | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 798 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | L36 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 2 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | DEU | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL LETTERS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2015ApJ...798L..36C | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_11 Relativistic astrophysics | en_US |
dc.description.apc | sì | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.orcid | 0000-0003-3140-8933 | - |
crisitem.journal.journalissn | 2041-8205 | - |
crisitem.journal.ance | E196528 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Ciolfi_2015_ApJL_798_L36.pdf | Pdf editoriale | 274.58 kB | Adobe PDF | View/Open |
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