Fiore, A.A.FioreBENETTI, StefanoStefanoBENETTINicholl, M.M.NichollReguitti, A.A.ReguittiCAPPELLARO, EnricoEnricoCAPPELLAROCAMPANA, SergioSergioCAMPANABose, S.S.BoseParaskeva, E.E.ParaskevaBerger, E.E.BergerBravo, T. M.T. M.BravoBurke, J.J.BurkeCai, Y. -Z.Y. -Z.CaiChen, T. -W.T. -W.ChenChen, P.P.ChenCIOLFI, RICCARDORICCARDOCIOLFIDong, S.S.DongGomez, S.S.GomezGromadzki, M.M.GromadzkiGutiérrez, C. P.C. P.GutiérrezHiramatsu, D.D.HiramatsuHosseinzadeh, G.G.HosseinzadehHowell, D. A.D. A.HowellJerkstrand, A.A.JerkstrandKankare, E.E.KankareKozyreva, A.A.KozyrevaMaguire, K.K.MaguireMcCully, C.C.McCullyOchner, P.P.OchnerPellegrino, C.C.PellegrinoPignata, G.G.PignataPost, R. S.R. S.PostELIAS DE LA ROSA, NANCY DEL CARMENNANCY DEL CARMENELIAS DE LA ROSAShahbandeh, M.M.ShahbandehSchuldt, S.S.SchuldtThomas, B. P.B. P.ThomasTOMASELLA, LinaLinaTOMASELLAVinkó, J.J.VinkóVogl, C.C.VoglWheeler, J. C.J. C.WheelerYoung, D. R.D. R.Young2023-06-012023-06-0120220035-8711http://hdl.handle.net/20.500.12386/34231SN 2018hti was a very nearby (z = 0.0614) superluminous supernova with an exceedingly bright absolute magnitude of -21.7 mag in r band at maximum. The densely sampled pre-maximum light curves of SN 2018hti show a slow luminosity evolution and constrain the rise time to ~50 rest-frame d. We fitted synthetic light curves to the photometry to infer the physical parameters of the explosion of SN 2018hti for both the magnetar and the CSM-interaction scenarios. We conclude that one of two mechanisms could be powering the luminosity of SN 2018hti; interaction with ~10 M<SUB>⊙</SUB> of circumstellar material or a magnetar with a magnetic field of B<SUB>p</SUB>~ 1.3 × 10<SUP>13</SUP> G, and initial period of P<SUB>spin</SUB>~ 1.8 ms. From the nebular spectrum modelling we infer that SN 2018hti likely results from the explosion of a ${\sim}40\, \mathrm{M}_\odot$ progenitor star.STAMPAenArticle10.1093/mnras/stac7442-s2.0-85132493038https://academic.oup.com/mnras/article/512/3/4484/6549929http://arxiv.org/abs/2111.07142v22022MNRAS.512.4484FFIS/05 - ASTRONOMIA E ASTROFISICA