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Title: Supernova Siblings: Assessing the Consistency of Properties of Type Ia Supernovae that Share the Same Parent Galaxies

Journal Article · · The Astrophysical Journal. Letters (Online)
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While many studies have shown a correlation between properties of the light curves of Type Ia SN (SNe Ia) and properties of their host galaxies, it remains unclear what is driving these correlations. We introduce a new direct method to study these correlations by analyzing `parent' galaxies that host multiple SNe Ia 'siblings'. Here, we search the Dark Energy Survey SN sample, one of the largest samples of discovered SNe, and find 8 galaxies that hosted two likely Type Ia SNe. Comparing the light-curve properties of these SNe and recovered distances from the light curves, we find no better agreement between properties of SNe in the same galaxy as any random pair of galaxies, with the exception of the SN light-curve stretch. We show at 2.8σ significance that at least 1/2 of the intrinsic scatter of SNe Ia distance modulus residuals is not from common host properties. We also discuss the robustness with which we could make this evaluation with LSST, which will find 100× more pairs of galaxies, and pave a new line of study on the consistency of Type Ia supernovae in the same parent galaxies. Finally, we argue that it is unlikely some of these SNe are actually single, lensed SN with multiple images.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Chicago, IL (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); European Union (EU); European Research Council (ERC); Ministry of Economic Affairs and Digital Transformation of Spain (MINECO); Australian Research Council; Brazilian National Council for Scientific and Technological Development (CNPq)
Contributing Organization:
DES Collaboration
Grant/Contract Number:
AC02-07CH11359; AC02-76SF00515; SC0009924; FOA-0001358; AC02-05CH11231; SC0010007; NNG17PX03C; AST-1517742; AST-1518052; AST-1815935; AST1138766; AST-1536171; 839090; 240672; 291329; 306478; 615929; AYA2015-71825; ESP2015-66861; FPA2015-68048; SEV-2016-0588; SEV-2016-0597; MDM-2015-0509; CE110001020; 465376/2014-2; SC0019193
OSTI ID:
1599315
Alternate ID(s):
OSTI ID: 1647635; OSTI ID: 1734762; OSTI ID: 1785321
Report Number(s):
FERMILAB-PUB-20-057-AE; arXiv:2002.00974; oai:inspirehep.net:1778552
Journal Information:
The Astrophysical Journal. Letters (Online), Vol. 896, Issue 1; ISSN 2041-8213
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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