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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - The Dark Energy Survey 5-year photometrically classified type Ia supernovae without host-galaxy redshifts
AU - Dark Energy Survey Collaboration
AU - Möller, A.
AU - Wiseman, P.
AU - Smith, M.
AU - Lidman, C.
AU - Davis, T. M.
AU - Kessler, R.
AU - Sako, M.
AU - Sullivan, M.
AU - Galbany, L.
AU - Lee, J.
AU - Nichol, R. C.
AU - Sánchez, B. O.
AU - Tucker, B. E.
AU - Abbott, T. M. C.
AU - Aguena, M.
AU - Allam, S.
AU - Alves, O.
AU - Andrade-Oliveira, F.
AU - Bacon, D.
AU - Bertin, E.
AU - Brooks, D.
AU - Carnero Rosell, A.
AU - Castander, F. J.
AU - Desai, S.
AU - Diehl, H. T.
AU - Everett, S.
AU - Ferrero, I.
AU - Friedel, D.
AU - Frieman, J.
AU - García-Bellido, J.
AU - Gaztanaga, E.
AU - Giannini, G.
AU - Gruendl, R. A.
AU - Gutierrez, G.
AU - Hinton, S. R.
AU - Hollowood, D. L.
AU - Honscheid, K.
AU - James, D. J.
AU - Kuehn, K.
AU - Lahav, O.
AU - Lee, S.
AU - Marshall, J. L.
AU - Mena-Fernández, J.
AU - Menanteau, F.
AU - Miquel, R.
AU - Myles, J.
AU - Ogando, R. L. C.
AU - Palmese, A.
AU - Pieres, A.
AU - Plazas Malagón, A. A.
PY - 2024/9/30
Y1 - 2024/9/30
N2 - Current and future Type Ia Supernova (SN Ia) surveys will need to adopt new approaches to classifying SNe and obtaining their redshifts without spectra if they wish to reach their full potential. We present here a novel approach that uses only photometry to identify SNe Ia in the 5-year Dark Energy Survey (DES) dataset using the SUPERNNOVA classifier. Our approach, which does not rely on any information from the SN host-galaxy, recovers SNe Ia that might otherwise be lost due to a lack of an identifiable host. We select 2,298 high-quality SNe Ia from the DES 5-year dataset. More than 700 of these have no spectroscopic host redshift and are potentially new SNIa compared to the DES-SN5YR cosmology analysis. To analyse these SNe Ia, we derive their redshifts and properties using only their light-curves with a modified version of the SALT2 light-curve fitter. Compared to other DES SN Ia samples with spectroscopic redshifts, our new sample has in average higher redshift, bluer and broader light-curves, and fainter host-galaxies. Future surveys such as LSST will also face an additional challenge, the scarcity of spectroscopic resources for follow-up. When applying our novel method to DES data, we reduce the need for follow-up by a factor of four and three for host-galaxy and live SN respectively compared to earlier approaches. Our novel method thus leads to better optimisation of spectroscopic resources for follow-up....
AB - Current and future Type Ia Supernova (SN Ia) surveys will need to adopt new approaches to classifying SNe and obtaining their redshifts without spectra if they wish to reach their full potential. We present here a novel approach that uses only photometry to identify SNe Ia in the 5-year Dark Energy Survey (DES) dataset using the SUPERNNOVA classifier. Our approach, which does not rely on any information from the SN host-galaxy, recovers SNe Ia that might otherwise be lost due to a lack of an identifiable host. We select 2,298 high-quality SNe Ia from the DES 5-year dataset. More than 700 of these have no spectroscopic host redshift and are potentially new SNIa compared to the DES-SN5YR cosmology analysis. To analyse these SNe Ia, we derive their redshifts and properties using only their light-curves with a modified version of the SALT2 light-curve fitter. Compared to other DES SN Ia samples with spectroscopic redshifts, our new sample has in average higher redshift, bluer and broader light-curves, and fainter host-galaxies. Future surveys such as LSST will also face an additional challenge, the scarcity of spectroscopic resources for follow-up. When applying our novel method to DES data, we reduce the need for follow-up by a factor of four and three for host-galaxy and live SN respectively compared to earlier approaches. Our novel method thus leads to better optimisation of spectroscopic resources for follow-up....
U2 - 10.1093/mnras/stae1953
DO - 10.1093/mnras/stae1953
M3 - Journal article
VL - 533
SP - 2073
EP - 2088
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -