• DOI:10.3847/2041-8213/AB8735
• Corpus ID: 211020659

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

@article{Scolnic2020SupernovaSA,
  title={Supernova Siblings: Assessing the Consistency of Properties of Type Ia Supernovae that Share the Same Parent Galaxies},
  author={Dan Scolnic and M. Smith and Aisha Massiah and Philip Wiseman and Dillon Brout and Richard Kessler and Tamara M. Davis and Ryan J. Foley and Llu{\'i}s Galbany and Samuel R. Hinton and Rebekah Hounsell and L Kelsey and Christopher E. Lidman and E Macaulay and Robert Morgan and Robert Nichol and Anais M{\"o}ller and Brodie Popovic and Masao Sako and Mark Sullivan and B. P. Thomas and Brad E. Tucker and Timothy M. C. Abbott and Michel Aguena and Sahar Allam and James T. Annis and Santiago {\'A}vila and Keith C. Bechtol and Emmanuel Bertin and David Brooks and David L. Burke and Aurelio Carnero Rosell and Daniela Carollo and Matias Carrasco Kind and Jorge Carretero and M. Costanzi and L. N. da Costa and Juan Carlos de Vicente and Shantanu Desai and H. Thomas Diehl and Peter Doel and Alex Drlica-Wagner and Kathleen D. Eckert and T. F. Eifler and S. Everett and Brenna L. Flaugher and Pablo Fosalba and Joshua A. Frieman and Juan Garc'ia-Bellido and Enrique Gazta{\~n}aga and David W. Gerdes and Karl Glazebrook and Daniel Gruen and Robert A. Gruendl and Julia Gschwend and Gaston R. Guti{\'e}rrez and William G. Hartley and Devon L. Hollowood and Klaus Honscheid and David J. James and Kyler W. Kuehn and Nikolay Kuropatkin and Geraint F. Lewis and T. S. Li and Marcos Lima and Marcio A. G. Maia and Jennifer L. Marshall and Felipe Menanteau and Ramon Miquel and Antonella Palmese and Francisco Paz-Chinch{\'o}n and Andreas Alejandro Plazas and Miika Pursiainen and Eusebio S{\'a}nchez and Victor E. Scarpine and Michael S. Schubnell and Santiago Serrano and Ignacio Sevilla-Noarbe and Natalia E. Sommer and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and T. N. Varga and Alistair R. Walker and R. D. Wilkinson},
  journal={The Astrophysical Journal},
  year={2020}
}

• D. Scolnic, M. Smith, +82 authors R. Wilkinson
• Published 3 February 2020
• Physics
• The Astrophysical Journal

While many studies have shown a correlation between properties of the light curves of 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 eight galaxies that hosted two likely SNe Ia. 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 one-half 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 SNe Ia in the same parent galaxies. Finally, we argue that it is unlikely that some of these SNe are actually single, lensed SN with multiple images.