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Hoogendam, W. B.; Ashall, C.; Galbany, L.; Shappee, B. J.; Burns, C. R.; Lu, J.; Phillips, M. M.; Baron, E.; Holmbo, S.; Hsiao, E. Y.; Morrell, N.; Stritzinger, M. D.; Suntzeff, N. B.; Taddia, F.; Young, D. R.; Lyman, J. D.; Benetti, S.; Mazzali, P. A.; Delgado Mancheño, M.; Díaz, R. González; Torres, S. Muñoz
The Astrophysical journal, 04/2022, Letnik: 928, Številka: 2Journal Article
Abstract We present optical and near-infrared photometric and spectroscopic observations of the fast-declining Type Ia supernova (SN) 2015bo. SN 2015bo is underluminous ( M B = −17.50 ± 0.15 mag) and has a fast-evolving light curve (Δm15( B ) = 1.91 ± 0.01 mag and s BV = 0.48 ± 0.01). It has a unique morphology in the observed V − r color curve, where it is bluer than all other supernovae (SNe) in the comparison sample. A 56 Ni mass of 0.17 ± 0.03 M ⊙ was derived from the peak bolometric luminosity, which is consistent with its location on the luminosity–width relation. Spectroscopically, SN 2015bo is a cool SN in the Branch classification scheme. The velocity evolution measured from spectral features is consistent with 1991bg-like SNe. SN 2015bo has a SN twin (similar spectra) and sibling (same host galaxy), SN 1997cn. Distance moduli of μ = 34.33 ± 0.01 (stat) ±0.11 (sys) mag and μ = 34.34 ± 0.04 (stat) ± 0.12 (sys) mag are derived for SN 2015bo and SN 1997cn, respectively. These distances are consistent at the 0.06 σ level with each other, and they are also consistent with distances derived using surface-brightness fluctuations and redshift-corrected cosmology. This suggests that fast-declining SNe could be accurate distance indicators, which should not be excluded from future cosmological analyses.
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