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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SN 2011hs: A fast and faint type IIb supernova from a supergiant progenitor
Monthly Notices of the Royal Astronomical Society, Volume 439, No. 2, Year 2014
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Description
Observations spanning a largewavelength range, from X-ray to radio, of the Type IIb supernova (SN) 2011hs are presented, covering its evolution during the first year after explosion. The optical light curve presents a narrower shape and a fainter luminosity at peak than previously observed for Type IIb SNe. High expansion velocities are measured from the broad absorption HI and He I lines. From the comparison of the bolometric light curve and the time evolution of the photospheric velocities with hydrodynamical models, we found that SN 2011hs is consistent with the explosion of a 3-4M⊙ He-core progenitor star, corresponding to a mainsequence mass of 12-15M⊙, that ejected a mass of 56Ni of about 0.04M⊙, with an energy of E = 8.5 × 1050 erg. Such a low-mass progenitor scenario is in full agreement with the modelling of the nebular spectrum taken at ~215 d from maximum. From the modelling of the adiabatic cooling phase, we infer a progenitor radius of ̃500-600 R⊙, clearly pointing to an extended progenitor star. The radio light curve of SN 2011hs yields a peak luminosity similar to that of SN 1993J, but with a higher mass-loss rate and a wind density possibly more similar to that of SN 2001ig. Although no significant deviations from a smooth decline have been found in the radio light curves, we cannot rule out the presence of a binary companion star. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Bufano, Filomena
Chile, Santiago
Universidad Andrés Bello
Pignata, Giuliano
Chile, Santiago
Universidad Andrés Bello
Bersten, Melina C.
Japan, Tokyo
The University of Tokyo
Mazzali, Paolo A.
United Kingdom, Liverpool
Liverpool John Moores University
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Italy, Padua
Osservatorio Astronomico Di Padova
Ryder, Stuart D.
Australia
Australian Astronomical Observatory
Margutti, Raffaella A.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Milisavljevic, Danny
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Morelli, Lorenzo
Italy, Padua
Università Degli Studi Di Padova
Benetti, Stefano
Italy, Padua
Osservatorio Astronomico Di Padova
Cappellaro, Enrico
Italy, Padua
Osservatorio Astronomico Di Padova
González-Gaitán, Santiago
Chile, Santiago
Universidad de Chile
Romero-Cañizales, Cristina
Chile, Santiago
Pontificia Universidad Católica de Chile
Stritzinger, Maximilian D.
Denmark, Aarhus
Aarhus Universitet
Walker, Emma S.
United States, New Haven
Yale University
Anderson, Joseph P.
Chile, Santiago
Universidad de Chile
Contreras, Carlos
Denmark, Aarhus
Aarhus Universitet
Chile, La Serena
Las Campanas Observatory
de Jaeger, Thomas
Chile, Santiago
Universidad de Chile
Förster, Francisco
Chile, Santiago
Universidad de Chile
Gutiérrez, Claudia P.
Chile, Santiago
Universidad de Chile
Hamuy, Mario A.
Chile, Santiago
Universidad de Chile
Hsiao, Eric Y.
Chile, La Serena
Las Campanas Observatory
Morrell, Nidia I.
Chile, La Serena
Las Campanas Observatory
Olivares E, Felipe E.
Chile, Santiago
Universidad Andrés Bello
Paillas, Enrique
Chile, Santiago
Universidad Andrés Bello
Parker, Stuart
New Zealand, Oxford
Backyard Observatory Supernova Search
Pian, Elena
Italy, Pisa
Scuola Normale Superiore Di Pisa
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Pickering, Timothy E.
South Africa, Cape Town
South African Astronomical Observatory
Sanders, Nathan Edward
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Stockdale, Chris J.
Australia
Australian Astronomical Observatory
United States, Milwaukee
Marquette University
Turatto, Massimo
Italy, Padua
Osservatorio Astronomico Di Padova
Valenti, Stefano
Italy, Padua
Osservatorio Astronomico Di Padova
Fesen, Robert A.
United States, Hanover
Dartmouth College
Maza, José
Chile, Santiago
Universidad de Chile
Nomoto, Ken'Ichi N.Ichi
Japan, Tokyo
The University of Tokyo
Phillips, Mark M.
Chile, La Serena
Las Campanas Observatory
Soderberg, Alicia M.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Statistics
Citations: 55
Authors: 36
Affiliations: 19
Identifiers
Doi:
10.1093/mnras/stu065
ISSN:
00358711
e-ISSN:
13652966