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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| Autores principales: | , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2020
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/125179 |
| Aporte de: |
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I19-R120-10915-125179 |
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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 |
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Repositorios |
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1764820451345825792 |