Reference : A cosmology-independent calibration of type Ia supernovae data
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/226670
A cosmology-independent calibration of type Ia supernovae data
English
Hauret, Clémentine mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Magain, Pierre mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Biernaux, Judith mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
21-Sep-2018
Monthly Notices of the Royal Astronomical Society
Oxford University Press
479
3
3996-4003
Yes (verified by ORBi)
International
0035-8711
1365-2966
United Kingdom
[en] Cosmology : miscellaneous ; Supernovae : general ; Methods : data analysis
[en] Recently, the common methodology used to transform type Ia supernovae (SNe Ia)
into genuine standard candles has been suffering criticism. Indeed, it assumes a par-
ticular cosmological model (namely the flat LambdaCDM) to calibrate the standardisation
corrections parameters, i.e. the dependency of the supernova peak absolute magnitude
on its colour, post-maximum decline rate and host galaxy mass. As a result, this as-
sumption could make the data compliant to the assumed cosmology and thus nullify all
works previously conducted on model comparison. In this work, we verify the viability
of these hypotheses by developing a cosmology-independent approach to standardise
SNe Ia data from the recent JLA compilation. Our resulting corrections turn out to be
very close to the LambdaCDM-based corrections. Therefore, even if a LambdaCDM-based calibra-
tion is questionable from a theoretical point of view, the potential compliance of SNe
Ia data does not happen in practice for the JLA compilation. Previous works of model
comparison based on these data do not have to be called into question. However, as
this cosmology-independent standardisation method has the same degree of complex-
ity than the model-dependent one, it is worth using it in future works, especially if
smaller samples are considered, such as the superluminous type Ic supernovae.
Space sciences, Technologies and Astrophysics Research - STAR
Researchers
http://hdl.handle.net/2268/226670
10.1093/mnras/sty1715

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