The effect of environment on Type Ia supernovae in the Dark Energy Survey 
three-year cosmological sample

Kelsey, L.; Sullivan, M.; Smith, M.; Wiseman, P.; Brout, D.; Davis, T. M.; Frohmaier, C.; Galbany, L.; Grayling, M.; Gutiérrez, C. P.; Hinton, S. R.; Kessler, R.; Lidman, C.; Möller, A.; Sako, M.; Scolnic, D.; Uddin, S. A.; Vincenzi, M.; Abbott, T. M. C.; Aguena, M.; Allam, S.; Annis, J.; Avila, S.; Bacon, D.; Bertin, E.; Brooks, D.; Burke, D. L.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; Costanzi, M.; da Costa, L. N.; Desai, S.; Diehl, H. T.; Doel, P.; Everett, S.; Ferrero, I.; Ferté, A.; Flaugher, B.; Fosalba, P.; García-Bellido, J.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hollowood, D. L.; Honscheid, K.; James, D. J.; Kim, A. G.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Lima, M.; Marshall, J. L.; Martini, P.; Menanteau, F.; Miquel, R.; Morgan, R.; Ogando, R. L. C.; Palmese, A.; Paz-Chinchón, F.; Plazas, A. A.; Romer, A. K.; Sánchez, C.; Sanchez, E.; Serrano, S.; Sevilla-Noarbe, I.; Suchyta, E.; Tarle, G.; Thomas, D.; To, C.; Varga, T. N.; Walker, A. R.; Wilkinson, R. D.

doi:10.1093/mnras/staa3924

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The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample

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Varga, T. N.
Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Kelsey, L., Sullivan, M., Smith, M., Wiseman, P., Brout, D., Davis, T. M., Frohmaier, C., Galbany, L., Grayling, M., Gutiérrez, C. P., Hinton, S. R., Kessler, R., Lidman, C., Möller, A., Sako, M., Scolnic, D., Uddin, S. A., Vincenzi, M., Abbott, T. M. C., Aguena, M., Allam, S., Annis, J., Avila, S., Bacon, D., Bertin, E., Brooks, D., Burke, D. L., Rosell, A. C., Kind, M. C., Carretero, J., Castander, F. J., Costanzi, M., da Costa, L. N., Desai, S., Diehl, H. T., Doel, P., Everett, S., Ferrero, I., Ferté, A., Flaugher, B., Fosalba, P., García-Bellido, J., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D. L., Honscheid, K., James, D. J., Kim, A. G., Kuehn, K., Kuropatkin, N., Lahav, O., Lima, M., Marshall, J. L., Martini, P., Menanteau, F., Miquel, R., Morgan, R., Ogando, R. L. C., Palmese, A., Paz-Chinchón, F., Plazas, A. A., Romer, A. K., Sánchez, C., Sanchez, E., Serrano, S., Sevilla-Noarbe, I., Suchyta, E., Tarle, G., Thomas, D., To, C., Varga, T. N., Walker, A. R., & Wilkinson, R. D. (2021). The effect of environment on Type Ia supernovae in the Dark Energy Survey three-year cosmological sample. Monthly Notices of the Royal Astronomical Society, 501(4), 4861-4876. doi:10.1093/mnras/staa3924.

引用: https://hdl.handle.net/21.11116/0000-0008-FEF0-B

要旨

Analyses of Type Ia supernovae (SNe Ia) have found puzzling correlations between their standardized luminosities and host galaxy properties: SNe Ia in high-mass, passive hosts appear brighter than those in lower mass, star-forming hosts. We examine the host galaxies of SNe Ia in the Dark Energy Survey 3-yr spectroscopically confirmed cosmological sample, obtaining photometry in a series of ‘local’ apertures centred on the SN, and for the global host galaxy. We study the differences in these host galaxy properties, such as stellar mass and rest-frame U − R colours, and their correlations with SN Ia parameters including Hubble residuals. We find all Hubble residual steps to be >3σ in significance, both for splitting at the traditional environmental property sample median and for the step of maximum significance. For stellar mass, we find a maximal local step of 0.098 ± 0.018 mag; ∼0.03 mag greater than the largest global stellar mass step in our sample (0.070 ± 0.017 mag). When splitting at the sample median, differences between local and global U − R steps are small, both ∼0.08 mag, but are more significant than the global stellar mass step (0.057 ± 0.017 mag). We split the data into sub-samples based on SN Ia light-curve parameters: stretch (x1) and colour (c), finding that redder objects (c > 0) have larger Hubble residual steps, for both stellar mass and U − R, for both local and global measurements, of ∼0.14 mag. Additionally, the bluer (star-forming) local environments host a more homogeneous SN Ia sample, with local U − R rms scatter as low as 0.084 ± 0.017 mag for blue (c < 0) SNe Ia in locally blue U − R environments.