Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Cosmology Results using Type Ia Supernovae from the Dark Energy
  Survey: The Effect of Host Galaxy Properties on Supernova Luminosity   We present improved photometric measurements for the host galaxies of 206
spectroscopically confirmed type Ia supernovae discovered by the Dark Energy
Survey Supernova Program (DES-SN) and used in the first DES-SN cosmological
analysis. Fitting spectral energy distributions to the $griz$ photometric
measurements of the DES-SN host galaxies, we derive stellar masses and
star-formation rates. For the DES-SN sample, when considering a 5D ($z$, $x_1$,
$c$, $\alpha$, $\beta$) bias correction, we find evidence of a Hubble residual
`mass step', where SNe Ia in high mass galaxies ($>10^{10} \textrm{M}_{\odot}$)
are intrinsically more luminous (after correction) than their low mass
counterparts by $\gamma=0.040\pm0.019$mag. This value is larger by $0.031$mag
than the value found in the first DES-SN cosmological analysis. This difference
is due to a combination of updated photometric measurements and improved star
formation histories and is not from host-galaxy misidentification. When using a
1D (redshift-only) bias correction the inferred mass step is larger, with
$\gamma=0.066\pm0.020$mag. The 1D-5D $\gamma$ difference for DES-SN is
$0.026\pm0.009$mag. We show that this difference is due to a strong correlation
between host galaxy stellar mass and the $x_1$ component of the 5D
distance-bias correction. To better understand this effect, we include an
intrinsic correlation between light-curve width and stellar mass in simulated
SN Ia samples. We show that a 5D fit recovers $\gamma$ with $-9$mmag bias
compared to a $+2$mmag bias for a 1D fit. This difference can explain part of
the discrepancy seen in the data. Improvements in modeling correlations between
galaxy properties and SN is necessary to determine the implications for
$\gamma$ and ensure unbiased precision estimates of the dark energy
equation-of-state as we enter the era of LSST.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
0
The categories of this paper are: hep-ph