DES16C3cje: a low-luminosity, long-lived supernova

We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of ≲1500 km s⁻¹,...

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Detalles Bibliográficos
Autores principales: Martínez, Laureano, Bersten, Melina Cecilia, DES Collaboration
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Astronómicas
Supernovae: general
Supernovae: individual (DES16C3cje)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125179
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125179
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Supernovae: general
Supernovae: individual (DES16C3cje)
spellingShingle Ciencias Astronómicas
Supernovae: general
Supernovae: individual (DES16C3cje)
Martínez, Laureano
Bersten, Melina Cecilia
DES Collaboration
DES16C3cje: a low-luminosity, long-lived supernova
topic_facet Ciencias Astronómicas
Supernovae: general
Supernovae: individual (DES16C3cje)
description We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of ≲1500 km s⁻¹, and the light curve shows an initial peak that fades after 50 d before slowly rebrightening over a further 100 d to reach an absolute brightness of Mr ∼ −15.5 mag. The decline rate of the late-time light curve is then slower than that expected from the powering by radioactive decay of ⁵⁶Co, but is comparable to that expected from accretion power. Comparing the bolometric light curve with hydrodynamical models, we find that DES16C3cje can be explained by either (i) a low explosion energy (0.11 foe) and relatively large ⁵⁶Ni production of 0.075 M_⊙ from an ∼15 M⊙ red supergiant progenitor typical of other SNe II, or (ii) a relatively compact ∼40 M⊙ star, explosion energy of 1 foe, and 0.08 M_⊙ of ⁵⁶Ni. Both scenarios require additional energy input to explain the late-time light curve, which is consistent with fallback accretion at a rate of ∼0.5 × 10⁻⁸ M⊙ s⁻¹.
format Articulo
Preprint
author Martínez, Laureano
Bersten, Melina Cecilia
DES Collaboration
author_facet Martínez, Laureano
Bersten, Melina Cecilia
DES Collaboration
author_sort Martínez, Laureano
title DES16C3cje: a low-luminosity, long-lived supernova
title_short DES16C3cje: a low-luminosity, long-lived supernova
title_full DES16C3cje: a low-luminosity, long-lived supernova
title_fullStr DES16C3cje: a low-luminosity, long-lived supernova
title_full_unstemmed DES16C3cje: a low-luminosity, long-lived supernova
title_sort des16c3cje: a low-luminosity, long-lived supernova
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/125179
work_keys_str_mv AT martinezlaureano des16c3cjealowluminositylonglivedsupernova
AT berstenmelinacecilia des16c3cjealowluminositylonglivedsupernova
AT descollaboration des16c3cjealowluminositylonglivedsupernova
bdutipo_str Repositorios
_version_ 1764820451345825792

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