HOST GALAXY PROPERTIES AND HUBBLE RESIDUALS OF TYPE Ia SUPERNOVAE FROM THE NEARBY SUPERNOVA FACTORY

Childress, M.; Aldering, G.; Antilogus, P.; Aragon, C.; Bailey, S.; Baltay, C.; Bongard, S.; Buton, C.; Canto, A.; Cellier-Holzem, F.; Chotard, N.; Copin, Y.; Fakhouri, H. K.; Gangler, É.; Guy, J.; Hsiao, E. Y.; Kerschhaggl, M.; Kim, A. G.; Kowalski, M.; Loken, S.; Nugent, P.; Paech, K.; Pain, R.; Pécontal, É.; Pereira, R.; Perlmutter, S.; Rabinowitz, D.; Rigault, M.; Runge, K.; Scalzo, R.; Smadja, G.; Tao, C.; Thomas, R. C.; Weaver, B. A.; Wu, Chenjie

doi:10.1088/0004-637x/770/2/108

Cited by 159 publications

(240 citation statements)

References 117 publications

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“…5.2.2 we show how this peculiar structure introduces the brightness offset observed between SNe in low-and highmass hosts. This "mass step" is seen in our sample (Childress et al 2013a), as well as in all other large surveys (Kelly et al 2010;Sullivan et al 2010;Gupta et al 2011;Johansson et al 2013). This suggests that this bimodality is not exclusive to the SNfactory data, but is an intrinsic property of SALT2-calibrated SNe Ia.…”

Section: Corrected Hubble Residual Distributionssupporting

confidence: 86%

“…This has been modeled as either a linear trend or a sharp step in corrected Hubble residuals between low-and high-mass hosts. In Childress et al (2013a) we established that a "mass step" at log(M/M ) = 10.2 gives a much better fit than a line, and we found that the RMS width of the transition is only 0.5 dex in mass. Because the mass of a galaxy correlates with its metallicity, age, and sSFR (see Tremonti et al 2004;Gallazzi et al 2005;Pérez-González et al 2008, respectively), this mass step is most likely driven by an intrinsic SN progenitor variation.…”

Section: Introductionmentioning

confidence: 73%

“…The SALT light-curve parameters and Hubble residuals for our SNe Ia have been presented previously in Bailey et al (2009), Chotard et al (2011), and Childress et al (2013a.…”

Section: σ Hα and Sn Ia Light-curve Propertiesmentioning

confidence: 99%

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Evidence of environmental dependencies of Type Ia supernovae from the Nearby Supernova Factory indicated by local Hα

Rigault

Copin

Aldering

et al. 2013

A&A

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213

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Context. Use of Type Ia supernovae (SNe Ia) as distance indicators has proven to be a powerful technique for measuring the darkenergy equation of state. However, recent studies have highlighted potential biases correlated with the global properties of their host galaxies, large enough to induce systematic errors into such cosmological measurements if not properly treated. Aims. We study the host galaxy regions in close proximity to SNe Ia in order to analyze relations between the properties of SN Ia events and environments where their progenitors most likely formed. In this paper we focus on local Hα emission as an indicator of young progenitor environments. Methods. The Nearby Supernova Factory has obtained flux-calibrated spectral timeseries for SNe Ia using integral field spectroscopy. These observations enabled the simultaneous measurement of the SN and its immediate vicinity. For 89 SNe Ia we measured or set limits on Hα emission, used as a tracer of ongoing star formation, within a 1 kpc radius around each SN. This constitutes the first direct study of the local environment for a large sample of SNe Ia with accurate luminosity, color, and stretch measurements. Results. Our local star formation measurements provide several critical new insights. We find that SNe Ia with local Hα emission are redder by 0.036 ± 0.017 mag, and that the previously noted correlation between stretch and host mass is driven entirely by the SNe Ia coming from locally passive environments, in particular at the low-stretch end. There is no such trend for SNe Ia in locally star-forming environments. Our most important finding is that the mean standardized brightness for SNe Ia with local Hα emission is 0.094 ± 0.031 mag fainter on average than for those without. This offset arises from a bimodal structure in the Hubble residuals, with one mode being shared by SNe Ia in all environments and the other one exclusive to SNe Ia in locally passive environments. This structure also explains the previously known host-mass bias. We combine the star formation dependence of this bimodality with the cosmic star formation rate to predict changes with redshift in the mean SN Ia brightness and the host-mass bias. The strong change predicted is confirmed using high-redshift SNe Ia from the literature. Conclusions. The environmental dependences in SN Ia Hubble residuals and color found here point to remaining systematic errors in the standardization of SNe Ia. In particular, the observed brightness offset associated with local Hα emission is predicted to cause a significant bias in current measurements of the dark energy equation of state. Recognition of these effects offers new opportunities to improve SNe Ia as cosmological probes. For instance, we note that the SNe Ia associated with local Hα emission are more homogeneous, resulting in a brightness dispersion of only 0.105 ± 0.012 mag. Key words. cosmology: observationsAppendix is available in electronic form at http://www.aanda.orgArticle published by EDP Sciences A66, page 1 of 17 A&A 560...

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Section: Corrected Hubble Residual Distributionssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 73%

See 1 more Smart Citation

Evidence of environmental dependencies of Type Ia supernovae from the Nearby Supernova Factory indicated by local Hα

Rigault

Copin

Aldering

et al. 2013

A&A

Self Cite

213

288

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“…This could be a reflection of dust, age, and/or metallicity in the progenitor systems (Childress et al 2013b).…”

Section: Dependence On Host Galaxy Massmentioning

confidence: 99%

“…This time-independent color variation encompasses both intrinsic color differences and those due to dust in the host galaxy. It is possible that the color correction varies with redshift, as a consequence of evolution of the progenitor and/or changes in the environment, for example, variation in the dust composition with galactic evolution (Childress et al 2013b). Redshift-dependent dust extinction can lead to biased estimates of cosmological parameters (Menard et al 2010a(Menard et al , 2010b.…”

Section: Redshift Evolution Of the Color Correctionmentioning

confidence: 99%

BAHAMAS: NEW ANALYSIS OF TYPE Ia SUPERNOVAE REVEALS INCONSISTENCIES WITH STANDARD COSMOLOGY

Shariff

Jiao

Trotta

et al. 2016

ApJ

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We present results obtained by applying our BAyesian HierArchical Modeling for the Analysis of Supernova cosmology (BAHAMAS) software package to the 740 spectroscopically confirmed supernovae of type Ia (SNe Ia) from the "Joint Light-curve Analysis" (JLA) data set. We simultaneously determine cosmological parameters and standardization parameters, including corrections for host galaxy mass, residual scatter, and object-by-object intrinsic magnitudes. Combining JLA and Planck data on the cosmic microwave background, we find significant discrepancies in cosmological parameter constraints with respect to the standard analysis: we find W =  0.399 0.027 m , s 2.8 higher than previously reported, and = - w 0.910 0.045, s 1.6 higher than the standard analysis. We determine the residual scatter to be s =  0.104 0.005 res . We confirm (at the 95% probability level) the existence of two subpopulations segregated by host galaxy mass, separated at, differing in mean intrinsic magnitude by 0.055 ± 0.022 mag, lower than previously reported. Cosmological parameter constraints, however, are unaffected by the inclusion of corrections for host galaxy mass. We find s4 evidence for a sharp drop in the value of the color correction parameter, ( ) b z , at a redshift =  z 0.662 0.055 t . We rule out some possible explanations for this behavior, which remains unexplained.

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Resolving stellar populations with integral field spectroscopy

2019

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High-performance instruments at large ground-based telescopes have made integral field spectroscopy (IFS) a powerful tool for the study of extended objects such as galaxies, nebulae, or even larger survey fields on the sky. Here, we discuss the capabilities of IFS for the study of resolved stellar populations, using the new method of point-spread-function-fitting crowded field IFS, analogous to the well-established technique of crowded field photometry with image sensors. We review early pioneering work with first-generation integral field spectrographs, the breakthrough achieved with the multiunit spectral explorer (MUSE) instrument at the European Organisation for Astronomical Research in the Southern Hemisphere (ESO) Very Large Telescope, the remarkable progress accomplished with MUSE in the study of globular clusters, and first results on nearby galaxies. We discuss the synergy of integral field spectrographs at 8-10 m class telescopes with future facilities such as the extremely large telescope (ELT). K E Y W O R D Sextremely large telescope, integral field spectroscopy, resolved stellar populations 1 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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HOST GALAXY PROPERTIES AND HUBBLE RESIDUALS OF TYPE Ia SUPERNOVAE FROM THE NEARBY SUPERNOVA FACTORY

Cited by 159 publications

References 117 publications

Evidence of environmental dependencies of Type Ia supernovae from the Nearby Supernova Factory indicated by local Hα

Evidence of environmental dependencies of Type Ia supernovae from the Nearby Supernova Factory indicated by local Hα

BAHAMAS: NEW ANALYSIS OF TYPE Ia SUPERNOVAE REVEALS INCONSISTENCIES WITH STANDARD COSMOLOGY

Resolving stellar populations with integral field spectroscopy

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