Nebular spectra of 111 Type Ia supernovae disfavour single-degenerate progenitors
: Tucker MA, Shappee BJ, Vallely PJ, Stanek KZ, Prieto JL, Botyanszki J, Kochanek CS, Anderson JP, Brown J, Galbany L, Holoien TWS, Hsiao EY, Kumar S, Kuncarayakti H, Morrell N, Phillips MM, Stritzinger MD, Thompson TA
Publisher: OXFORD UNIV PRESS
: 2020
: Monthly Notices of the Royal Astronomical Society
: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
: MON NOT R ASTRON SOC
: 493
: 1
: 1044
: 1062
: 19
: 0035-8711
: 1365-2966
DOI: https://doi.org/10.1093/mnras/stz3390
: https://research.utu.fi/converis/portal/detail/Publication/46521211
We place statistical constraints on Type Ia supernova (SN Ia) progenitors using 227 nebular-phase spectra of 111 SNe Ia. We find no evidence of stripped companion emission in any of the nebular-phase spectra. Upper limits are placed on the amount of mass that could go undetected in each spectrum using recent hydrodynamic simulations. With these null detections, we place an observational 3 sigma upper limit on the fraction of SNe Ia that are produced through the classical H-rich non-degenerate companion scenario of < 5.5 per cent. Additionally, we set a tentative 3 sigma upper limit otan He star progenitor scenarios of < 6.4 per cent, although further theoretical modelling is required. These limits refer to our most representative sample including normal, 91bg-like, 91T-like, and 'super-Chandrasekhar' SNe Ia but excluding SNe Iax and SNe Ia-CSM. As part of our analysis, we also derive a Nebular Phase Phillips Relation, which approximates the brightness of an SN Ia from 150 to 500 d after maximum using the peak magnitude and decline rate parameter Delta m(15)(B).
UTU Research Portal