Improving cosmological distance measurements using twin type Ia supernovae

Fakhouri, H. K.; Boone, K.; Aldering, G.; Antilogus, P.; Aragon, C.; Bailey, S.; Baltay, C.; Barbary, K.; Baugh, D.; Bongard, S.; Buton, C.; Chen, J.; Childress, M.; Chotard, N.; Copin, Y.; Fagrelius, P.; Feindt, U.; Fleury, M.; Fouchez, D.; Gangler, E.; Hayden, B.; Kim, A. G.; Kowalski, M.; Leget, P. -F.; Lombardo, S.; Nordin, J.; Pain, R.; Pecontal, E.; Pereira, R.; Perlmutter, S.; Rabinowitz, D.; Ren, J.; Rigault, M.; Rubin, D.; Runge, K.; Saunders, C.; Scalzo, R.; Smadja, G.; Sofiatti, C.; Strovink, M.; Suzuki, N.; Tao, C.; Thomas, R. C.; Weaver, B. A.

doi:10.1088/0004-637X/815/1/58

Improving cosmological distance measurements using twin type Ia supernovae

Journal Article · Wed Dec 09 00:00:00 EST 2015 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/815/1/58· OSTI ID:1465697

Fakhouri, H. K.; ; Aldering, G.; Antilogus, P.; Aragon, C.; Bailey, S.; Baltay, C.; Barbary, K.; Baugh, D.; Bongard, S.; Buton, C.; Chen, J.; Childress, M.; Chotard, N.; Copin, Y.; ; Feindt, U.; Fleury, M.; Fouchez, D.; Gangler, E. more »

We introduce a method for identifying “twin” Type Ia supernovae (SNe Ia) and using them to improve distance measurements. This novel approach to SN Ia standardization is made possible by spectrophotometric time series observations from the Nearby Supernova Factory (SNfactory). We begin with a well-measured set of SNe, find pairs whose spectra match well across the entire optical window, and then test whether this leads to a smaller dispersion in their absolute brightnesses. This analysis is completed in a blinded fashion, ensuring that decisions made in implementing the method do not inadvertently bias the result. We find that pairs of SNe with more closely matched spectra indeed have reduced brightness dispersion. We are able to standardize this initial set of SNfactory SNe to 0.083 ± 0.012 mag, implying a dispersion of 0.072 ± 0.010 mag in the absence of peculiar velocities. We estimate that with larger numbers of comparison SNe, e.g., using the final SNfactory spectrophotometric data set as a reference, this method will be capable of standardizing high-redshift SNe to within 0.06–0.07 mag. Finally, these results imply that at least 3/4 of the variance in Hubble residuals in current SN cosmology analyses is due to previously unaccounted-for astrophysical differences among the SNe.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: The Nearby Supernova Factory

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1465697

Alternate ID(s):: OSTI ID: 22521785

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 815; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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