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Title: IMPROVING COSMOLOGICAL DISTANCE MEASUREMENTS USING TWIN TYPE IA SUPERNOVAE

Abstract

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. 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.

Authors:
; ; ; ; ;  [1]; ; ;  [2];  [3];  [4]; ;  [5]; ; ;  [6];  [7];  [8];  [9];  [10] more »; « less
  1. Physics Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States)
  2. Laboratoire de Physique Nucléaire et des Hautes Énergies, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, F-75252 Paris Cedex 05 (France)
  3. Department of Physics, Yale University, New Haven, CT 06250-8121 (United States)
  4. Department of Physics, University of California Berkeley, 366 LeConte Hall MC 7300, Berkeley, CA 94720-7300 (United States)
  5. Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084 (China)
  6. Université de Lyon 1, Villeurbanne (France)
  7. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611 (Australia)
  8. Institut fur Physik, Humboldt-Universitat zu Berlin, Newtonstrasse 15, D-12489 Berlin (Germany)
  9. Centre de Physique des Particules de Marseille, Aix-Marseille Université, CNRS/IN2P3, 163 avenue de Luminy—Case 902—F-13288 Marseille Cedex 09 (France)
  10. Clermont Université, Université Blaise Pascal, CNRS/IN2P3, Laboratoire de Physique Corpusculaire, BP 10448, F-63000 Clermont-Ferrand (France)
Publication Date:
OSTI Identifier:
22521785
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 815; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BRIGHTNESS; COMPARATIVE EVALUATIONS; COSMOLOGY; DISTANCE; EMISSION SPECTRA; EMISSION SPECTROSCOPY; RED SHIFT; SPECTROPHOTOMETRY; SUPERNOVAE; VELOCITY

Citation Formats

Fakhouri, H. K., Boone, K., Aldering, G., Aragon, C., Bailey, S., Fagrelius, P., Antilogus, P., Bongard, S., Fleury, M., Baltay, C., Barbary, K., Baugh, D., Chen, J., Buton, C., Chotard, N., Copin, Y., CNRS/IN2P3, Institut de Physique Nucléaire de Lyon, F-69622, Lyon, Childress, M., Feindt, U., Fouchez, D., Gangler, E., Collaboration: Nearby Supernova Factory, and others, and. IMPROVING COSMOLOGICAL DISTANCE MEASUREMENTS USING TWIN TYPE IA SUPERNOVAE. United States: N. p., 2015. Web. doi:10.1088/0004-637X/815/1/58.
Fakhouri, H. K., Boone, K., Aldering, G., Aragon, C., Bailey, S., Fagrelius, P., Antilogus, P., Bongard, S., Fleury, M., Baltay, C., Barbary, K., Baugh, D., Chen, J., Buton, C., Chotard, N., Copin, Y., CNRS/IN2P3, Institut de Physique Nucléaire de Lyon, F-69622, Lyon, Childress, M., Feindt, U., Fouchez, D., Gangler, E., Collaboration: Nearby Supernova Factory, & others, and. IMPROVING COSMOLOGICAL DISTANCE MEASUREMENTS USING TWIN TYPE IA SUPERNOVAE. United States. doi:10.1088/0004-637X/815/1/58.
Fakhouri, H. K., Boone, K., Aldering, G., Aragon, C., Bailey, S., Fagrelius, P., Antilogus, P., Bongard, S., Fleury, M., Baltay, C., Barbary, K., Baugh, D., Chen, J., Buton, C., Chotard, N., Copin, Y., CNRS/IN2P3, Institut de Physique Nucléaire de Lyon, F-69622, Lyon, Childress, M., Feindt, U., Fouchez, D., Gangler, E., Collaboration: Nearby Supernova Factory, and others, and. Thu . "IMPROVING COSMOLOGICAL DISTANCE MEASUREMENTS USING TWIN TYPE IA SUPERNOVAE". United States. doi:10.1088/0004-637X/815/1/58.
@article{osti_22521785,
title = {IMPROVING COSMOLOGICAL DISTANCE MEASUREMENTS USING TWIN TYPE IA SUPERNOVAE},
author = {Fakhouri, H. K. and Boone, K. and Aldering, G. and Aragon, C. and Bailey, S. and Fagrelius, P. and Antilogus, P. and Bongard, S. and Fleury, M. and Baltay, C. and Barbary, K. and Baugh, D. and Chen, J. and Buton, C. and Chotard, N. and Copin, Y. and CNRS/IN2P3, Institut de Physique Nucléaire de Lyon, F-69622, Lyon and Childress, M. and Feindt, U. and Fouchez, D. and Gangler, E. and Collaboration: Nearby Supernova Factory and others, and},
abstractNote = {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. 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.},
doi = {10.1088/0004-637X/815/1/58},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 815,
place = {United States},
year = {2015},
month = {12}
}

Works referencing / citing this record:

Stellar twins determine the distance of the Pleiades
journal, October 2016


Understanding type Ia supernovae through their U -band spectra
journal, June 2018