Home List of Titles Near-infrared observations of Type Ia supernovae: the best known standard candle for cosmology
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/232916
- Near-infrared observations of Type Ia supernovae: the best known standard candle for cosmology
- Barone-Nugent, R. L.; Lidman, C.; Wyithe, J. S. B.; Mould, J.; Howell, D. A.; Hook, I. M.; Sullivan, M.; Nugent, P. E.; Arcavi, I.; Cenko, S. B.; Cooke, J.; Gal-Yam, A.; Hsiao, E. Y.; Kasliwal, M. M.; Maguire, K.; Ofek, E.; Poznanski, D.; Xu, D.
- We present an analysis of the Hubble diagram for 12 normal Type Ia supernovae (SNe Ia) observed in the near-infrared (NIR) J and H bands. We select SNe exclusively from the redshift range 0.03 < z < 0.09 to reduce uncertainties coming from peculiar velocities while remaining in a cosmologically well-understood region. All of the SNe in our sample exhibit no spectral or B-band light-curve peculiarities and lie in the B-band stretch range of 0.8–1.15. Our results suggest that SNe Ia observed in the NIR are the best known standard candles. We fit previously determined NIR light-curve templates to new high-precision data to derive peak magnitudes and to determine the scatter about the Hubble line. Photometry of the 12 SNe is presented in the natural system. Using a standard cosmology of (H0, Ωm, ΩΛ) = (70, 0.27, 0.73), we find a median J-band absolute magnitude of MJ = −18.39 with a scatter of σJ = 0.116 and a median H-band absolute magnitude of MH = −18.36 with a scatter of σH = 0.085. The scatter in the H band is the smallest yet measured. We search for correlations between residuals in the J- and H-band Hubble diagrams and SN properties, such as SN colour, B-band stretch and the projected distance from the centre of the host galaxy. The only significant correlation is between the J-band Hubble residual and the J − H pseudo-colour. We also examine how the scatter changes when fewer points in the NIR are used to constrain the light curve. With a single point in the H band taken anywhere from 10 d before to 15 d after B-band maximum light and a prior on the date of H-band maximum set from the date of B-band maximum, we find that we can measure distances to an accuracy of 6 per cent. The precision of SNe Ia in the NIR provides new opportunities for precision measurements of both the expansion history of the universe and peculiar velocities of nearby galaxies.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology
- Monthly Notices of the Royal Astronomical Society, Vol. 425, no. 2 (Sep 2012), pp. 1007-1012
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Cosmological observations; Distance scale; Type Ia supernovae
- Wiley-Blackwell Publishing
- Publisher URL
- Copyright © 2012 The Authors. Monthly Notices of the Royal Astronomical Society copyright © 2012 RAS.
- Peer reviewed