학술논문
The Dark Energy Survey Supernova Program results: Type Ia Supernova brightness correlates with host galaxy dust
Document Type
Working Paper
Author
Meldorf, Cole; Palmese, Antonella; Brout, Dillon; Chen, Rebecca; Scolnic, Daniel; Kelsey, Lisa; Galbany, Lluís; Hartley, Will; Davis, Tamara; Drlica-Wagner, Alex; Vincenzi, Maria; Annis, James; Dixon, Mitchell; Graur, Or; Kim, Alex; Lidman, Christopher; Möller, Anais; Nugent, Peter; Rose, Benjamin; Smith, Mathew; Allam, Sahar; Diehl, H. Thomas; Tucker, Douglas; Asorey, Jacobo; Calcino, Josh; Carollo, Daniela; Glazebrook, Karl; Lewis, Geraint; Taylor, Georgina; Tucker, Brad E.; Aguena, Michel; Andrade-Oliveira, Felipe; Bacon, David; Bertin, Emmanuel; Bocquet, Sebastian; Brooks, David; Burke, David; Carretero, Jorge; Kind, Matias Carrasco; Castander, Francisco Javier; Costanzi, Matteo; da Costa, Luiz; Desai, Shantanu; Doel, Peter; Everett, Spencer; Ferrero, Ismael; Friedel, Douglas; Frieman, Josh; Garcia-Bellido, Juan; Gatti, Marco; Gruen, Daniel; Gschwend, Julia; Gutierrez, Gaston; Hinton, Samuel; Hollowood, Devon L.; Honscheid, Klaus; James, David; Kuehn, Kyler; March, Marisa; Marshall, Jennifer; Menanteau, Felipe; Miquel, Ramon; Morgan, Robert; Paz-Chinchon, Francisco; Pereira, Maria Elidaiana da Silva; Sanchez, Eusebio; Scarpine, Vic; Sevilla, Ignacio; Suchyta, Eric; Tarle, Gregory; Varga, Tamas Norbert
Source
Subject
Language
Abstract
Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between color and luminosity ($\beta$) and do not account for varying host-galaxy dust properties. However, from studies of dust in large samples of galaxies, it is known that dust attenuation can vary significantly. Here we take advantage of state-of-the-art modeling of galaxy properties to characterize dust parameters (dust attenuation $A_V$, and a parameter describing the dust law slope $R_V$) for the Dark Energy Survey (DES) SN Ia host galaxies using the publicly available \texttt{BAGPIPES} code. Utilizing optical and infrared data of the hosts alone, we find three key aspects of host dust that impact SN Ia cosmology: 1) there exists a large range ($\sim1-6$) of host $R_V$ 2) high stellar mass hosts have $R_V$ on average $\sim0.7$ lower than that of low-mass hosts 3) there is a significant ($>3\sigma$) correlation between the Hubble diagram residuals of red SNe Ia that when corrected for reduces scatter by $\sim13\%$ and the significance of the ``mass step'' to $\sim1\sigma$. These represent independent confirmations of recent predictions based on dust that attempted to explain the puzzling ``mass step'' and intrinsic scatter ($\sigma_{\rm int}$) in SN Ia analyses. We also find that red-sequence galaxies have both lower and more peaked dust law slope distributions on average in comparison to non red-sequence galaxies. We find that the SN Ia $\beta$ and $\sigma_{\rm int}$ both differ by $>3\sigma$ when determined separately for red-sequence galaxy and all other galaxy hosts. The agreement between fitted host-$R_V$ and SN Ia $\beta$ \& $\sigma_{\rm int}$ suggests that host dust properties play a major role in SN Ia color-luminosity standardization and supports the claim that SN Ia intrinsic scatter is driven by $R_V$ variation.
Comment: 22 pages. Submitted to MNRAS
Comment: 22 pages. Submitted to MNRAS