SIMBAD references

2021ApJ...923..197P - Astrophys. J., 923, 197-197 (2021/December-3)

Are Type Ia supernovae in rest-frame H brighter in more massive galaxies?

PONDER K.A., WOOD-VASEY W.M., WEYANT A., BARTON N.T., GALBANY L., LIU S., GARNAVICH P. and MATHESON T.

Abstract (from CDS):

We analyze 143 Type Ia supernovae (SNe Ia) observed in H band (1.6-1.8 µm) and find that SNe Ia are intrinsically brighter in H band with increasing host galaxy stellar mass. We find that SNe Ia in galaxies more massive than 1010.43 M are 0.13 ± 0.04 mag brighter in H than SNe Ia in less massive galaxies. The same set of SNe Ia observed at optical wavelengths, after width-color-luminosity corrections, exhibit a 0.10 ± 0.03 mag offset in the Hubble residuals. We observe an outlier population (| ΔH{max}| > 0.5 mag) in the H band and show that removing the outlier population moves the mass threshold to 1010.65 M and reduces the step in H band to 0.08 ± 0.04 mag, but the equivalent optical mass step is increased to 0.13 ± 0.04 mag. We conclude that the outliers do not drive the brightness-host-mass correlation. Less massive galaxies preferentially host more higher-stretch SNe Ia, which are intrinsically brighter and bluer. It is only after correction for width-luminosity and color-luminosity relationships that SNe Ia have brighter optical Hubble residuals in more massive galaxies. Thus, finding that SNe Ia are intrinsically brighter in H in more massive galaxies is an opposite correlation to the intrinsic (pre-width-luminosity correction) optical brightness. If dust and the treatment of intrinsic color variation were the main driver of the host galaxy mass correlation, we would not expect a correlation of brighter H-band SNe Ia in more massive galaxies.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Cosmology - Dark energy - Type Ia supernovae - Supernovae

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 30

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2023.01.31-23:42:30

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