Padova-Asiago Supernova Group

The correlation of rate of Type Ia Supernovae with the parent galaxy properties: lights and shadows
Greggio, L. and Cappellaro, E. 2019 A&A submitted (arXiv 1903.05412)
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The identification of the progenitors of Type Ia Supernovae (SNIa) is extremely important in several astrophysical contexts, ranging from stellar evolution in close binary systems to evaluating cosmological parameters. Determining the distribution of the delay times (DTD) of SNIa progenitors can shed light on their nature. In this paper we investigate on the diagnostic capabilities on the DTD of the correlation between the SNIa rate and the parent galaxy properties by examining its systematics with the various parameters at play: simple stellar population models, the adopted description for the star formation history in galaxies, and the way in which the masses of the galaxies are evaluated. We compute models for the correlations of the SNIa rate with the parent galaxy color and specific star formation rate for a variety of input ingredients, and for a few astrophysically motivated DTD laws. The models are compared to the results of three independent observational surveys. We find that the scaling of the SNIa rate with the properties of the parent galaxy is sensitive to all input ingredients mentioned above. This is a severe limitation on the possibility to discriminate alternative DTDs. In addition, current surveys show some discrepancies for the rate measured in the reddest and bluest galaxies, likely due to limited statistics and inhomogeneity of the observations. For galaxies with intermediate colors the rates are in agreement, leading to a robust determination of the productivity of SNIa from stellar populations of ≃ 0.8 events per 1000 \msun. Large stastistics of SNIa events along with accurate measurements of the star formation history in the galaxies are required to derive firm constraints on the DTD. LSST will achieve these results by providing the homogeneous, unbiased and vast database on both SNIa and galaxies.

sn galaxy RA DEC discoverer type redshift ref class fits
SDSS J144110.10+3904 14:41:10.005 +39:04:20.56     0.0538 ATEL
SDSS J102208.88-0232 10:22:08.983 -02:32:47.00 ATLAS Ia 0.068 ATEL
SDSS J163425.34+1136 16:34:25.447 +11:36:49.42 ZTF Ia 0.050085 ATEL
MCG+05-31-141 13:08:57.319 +28:16:51.92 ASASSN Ia 0.019512 ATEL
SDSS J162651.99+2923 16:26:51.714 +29:23:08.56 ZTF Ia 0.078316 ATEL