Artículo
Final Moments. II: Observational Properties and Physical Modeling of Circumstellar-material-interacting Type II Supernovae
Jacobson Galán, W. V.; Dessart, L.; Davis, K. W.; Kilpatrick, C. D.; Margutti, R.; Ertini, Keila Yael
; Haynie, A.; Hosseinzadeh, G.; Ibik, A. L.; Jha, S. W.; Jones, D. O.; Langeroodi, D.; LeBaron, N.; Magnier, E. A.; Piro, A. L.; Raimundo, S. I.; Rest, A.; Rest, S.; Rich, R. Michael; Rojas Bravo, C.; Sears, H.; Taggart, K.; Villar, V. A.; Wainscoat, R. J.; Wang, X. -F.; Wasserman, A. R.; Yan, S.; Yang, Y.; Zhang, J.; Zheng, W.

Fecha de publicación:
08/2024
Editorial:
IOP Publishing
Revista:
Astrophysical Journal
ISSN:
0004-637X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present ultraviolet/optical/near-infrared observations and modeling of Type II supernovae (SNe II) whose early time (δ t < 2 days) spectra show transient, narrow emission lines from shock ionization of confined (r < 1015 cm) circumstellar material (CSM). The observed electron-scattering broadened line profiles (i.e., IIn-like) of H I, He I/II, C IV, and N III/IV/V from the CSM persist on a characteristic timescale (t IIn) that marks a transition to a lower-density CSM and the emergence of Doppler-broadened features from the fast-moving SN ejecta. Our sample, the largest to date, consists of 39 SNe with early time IIn-like features in addition to 35 "comparison" SNe with no evidence of early time IIn-like features, all with ultraviolet observations. The total sample includes 50 unpublished objects with a total of 474 previously unpublished spectra and 50 multiband light curves, collected primarily through the Young Supernova Experiment and Global Supernova Project collaborations. For all sample objects, we find a significant correlation between peak ultraviolet brightness and both t IIn and the rise time, as well as evidence for enhanced peak luminosities in SNe II with IIn-like features. We quantify mass-loss rates and CSM density for the sample through the matching of peak multiband absolute magnitudes, rise times, t IIn, and optical SN spectra with a grid of radiation hydrodynamics and non-local thermodynamic equilibrium radiative-transfer simulations. For our grid of models, all with the same underlying explosion, there is a trend between the duration of the electron-scattering broadened line profiles and inferred mass-loss rate: tIIn≈3.8[Ṁ/ (0.01 M ⊙ yr‑1)] days.
Palabras clave:
TYPE II SUPERNOVAE
,
SHOCKS
,
CIRCUMSTELLAR GAS
,
ULTRAVIOLET ASTRONOMY
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Jacobson Galán, W. V.; Dessart, L.; Davis, K. W.; Kilpatrick, C. D.; Margutti, R.; et al.; Final Moments. II: Observational Properties and Physical Modeling of Circumstellar-material-interacting Type II Supernovae; IOP Publishing; Astrophysical Journal; 970; 2; 8-2024; 189; 1-39
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