Repozitorij Univerze v Novi Gorici

Izpis gradiva
A+ | A- | Pomoč | SLO | ENG

Naslov:Time-varying sodium absorption in the Type Ia supernova 2013gh
Avtorji:ID Ferretti, Raphael, Department of Physics, The Oskar Klein Centre, Stockholm University, Albanova, 106 92 Stockholm, Sweden (Avtor)
ID Amanullah, R., Department of Physics, The Oskar Klein Centre, Stockholm University, Albanova, 106 92 Stockholm, Sweden (Avtor)
ID Goobar, Ariel, Department of Physics, The Oskar Klein Centre, Stockholm University, Albanova, 106 92 Stockholm, Sweden (Avtor)
ID Johansson, Joel, Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 7610001 Rehovot, Israel (Avtor)
ID Petrushevska, Tanja, Department of Physics, The Oskar Klein Centre, Stockholm University, Albanova, 106 92 Stockholm, Sweden (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Context. Temporal variability of narrow absorption lines in high-resolution spectra of Type Ia supernovae (SNe Ia) is studied to search for circumstellar matter. Time series which resolve the profiles of absorption lines such as Na I D or Ca II H&K are expected to reveal variations due to photoionisation and subsequent recombination of the gases. The presence, composition, and geometry of circumstellar matter may hint at the elusive progenitor system of SNe Ia and could also affect the observed reddening law. Aims. To date, there are few known cases of time-varying Na I D absorption in SNe Ia, all of which occurred during relatively late phases of the supernova (SN) evolution. Photoionisation, however, is predicted to occur during the early phases of SNe Ia, when the supernovae peak in the ultraviolet. We attempt, therefore, to observe early-time absorption-line variations by obtaining high-resolution spectra of SNe before maximum light. Methods. We have obtained photometry and high-resolution spectroscopy of SNe Ia 2013gh and iPTF 13dge, to search for absorptionline variations. Furthermore, we study interstellar absorption features in relation to the observed photometric colours of the SNe. Results. Both SNe display deep Na I D and Ca II H&K absorption features. Furthermore, small but significant variations are detected in a feature of the Na I D profile of SN 2013gh. The variations are consistent with either geometric effects of rapidly moving or patchy gas clouds or photoionisation of Na I gas at R ≈ 1019 cm from the explosion. Conclusions. Our analysis indicates that it is necessary to focus on early phases to detect photoionisation effects of gases in the circumstellar medium of SNe Ia. Different absorbers such as Na I and Ca II can be used to probe for matter at different distances from the SNe. The nondetection of variations during early phases makes it possible to put limits on the abundance of the species at those distances.
Ključne besede:supernovae: general – supernovae: individual: SN 2013gh – dust, extinction – circumstellar matter – supernovae: individual: iPTF 13dge
Verzija publikacije:Objavljena publikacija
Leto izida:2016
Št. strani:17
Številčenje:A40, 592
PID:20.500.12556/RUNG-3567-2f8a7997-ef48-19f1-97b1-eda260356b50 Novo okno
COBISS.SI-ID:4997115 Novo okno
DOI:10.1051/0004-6361/201628351 Novo okno
NUK URN:URN:SI:UNG:REP:OVKSDGLV
Datum objave v RUNG:23.01.2018
Število ogledov:3412
Število prenosov:0
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
:
Kopiraj citat
  
Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
Objavi na:Bookmark and Share


Postavite miškin kazalec na naslov za izpis povzetka. Klik na naslov izpiše podrobnosti ali sproži prenos.

Gradivo je del revije

Naslov:Astronomy and Astrophysics
Skrajšan naslov:A&A
Leto izida:2016

Nazaj