ZTF Early Observations of Type Ia Supernovae. III. Early-time Colors As a Test for Explosion Models and Multiple Populations

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dc.contributor.authorBulla, Mattia
dc.contributor.authorMiller, Adam A.
dc.contributor.authorYao, Yuhan
dc.contributor.authorDessart, Luc
dc.contributor.authorDhawan, Suhail
dc.contributor.authorPapadogiannakis, Semeli
dc.contributor.authorBiswas, Rahul
dc.contributor.authorGoobar, Ariel
dc.contributor.authorKulkarni, S. R.
dc.contributor.authorNordin, Jakob
dc.contributor.authorNugent, Peter
dc.contributor.authorPolin, Abigail
dc.contributor.authorSollerman, Jesper
dc.contributor.authorBellm, Eric C.
dc.contributor.authorCoughlin, Michael W.
dc.contributor.authorDekany, Richard
dc.contributor.authorGolkhou, V. Zach
dc.contributor.authorGraham, Matthew J.
dc.contributor.authorKasliwal, Mansi M.
dc.contributor.authorKupfer, Thomas
dc.contributor.authorLaher, Russ R.
dc.contributor.authorMasci, Frank J.
dc.contributor.authorPorter, Michael
dc.contributor.authorRusholme, Ben
dc.contributor.authorShupe, David L.
dc.date.accessioned2025-01-23T19:48:16Z
dc.date.available2025-01-23T19:48:16Z
dc.date.issued2020
dc.description.abstractColors of Type Ia supernovae (SNe Ia) in the first few days after explosion provide a potential discriminant between different models. In this paper, we present g - r colors of 65 SNe Ia discovered within 5 days from first light by the Zwicky Transient Facility in 2018, a sample that is about three times larger than that in the literature. We find that g - r colors are intrinsically rather homogeneous at early phases, with about half of the dispersion attributable to photometric uncertainties (0.18 mag). Colors are nearly constant starting from 6 days after first light (g-r similar to -0.15 mag), while the time evolution at earlier epochs is characterized by a continuous range of slopes, from events rapidly transitioning from redder to bluer colors (slope of similar to-0.25 mag day(-1)) to events with a flatter evolution. The continuum in the slope distribution is in good agreement both with models requiring some amount of Ni-56 mixed in the outermost regions of the ejecta and with "double-detonation" models having thin helium layers (M-He = 0.01 M-circle dot) and varying carbon-oxygen core masses. At the same time, six events show evidence for a distinctive "red bump" signature predicted by double-detonation models with larger helium masses. We finally identify a significant correlation between the early-timeg - rslopes and supernova brightness, with brighter events associated to flatter color evolution (p-value = 0.006). The distribution of slopes, however, is consistent with being drawn from a single population, with no evidence for two components as claimed in the literature based on B - V colors.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/abb13c
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/abb13c
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100433
dc.identifier.wosidWOS:000576551800001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectSurveys
dc.subjectSupernovae
dc.subjectType Ia supernovae
dc.titleZTF Early Observations of Type Ia Supernovae. III. Early-time Colors As a Test for Explosion Models and Multiple Populations
dc.typeartículo
dc.volumen902
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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