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| 題名: | Hubble space telescope studies of low-redshift type Ia supernovae: Evolution with redshift and ultraviolet spectral trends |
| 作者: | 潘彥丞;Maguire, K.;Sullivan, M.;Ellis, R. S.;Nugent, P. E.;Howell, D. A.;Gal‐Yam, A.;Cooke, J.;Mazzali, P.;Pan, Y.‐C.;Dilday, B.;Thomas, R. C.;Arcavi, I.;Ben‐Ami, S.;Bersier, D.;Bianco, F. B.;Fulton, B. J.;Hook, I.;Horesh, A.;Hsiao, E.;James, P. A.;Podsiadlowski, P.;Walker, E. S.;Yaron, O.;Kasliwal, M. M.;Laher, R. R.;Law, N. M.;Ofek, E. O.;Poznanski, D.;Surace, J. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astronomy;cosmological parameters;distance scale;galaxies: general;Red shift;Space telescopes;Star & galaxy formation;Supernovae;supernovae: general |
| 日期: | 2012-11-01 |
| 上傳時間: | 2026-04-21 14:16:48 (UTC+8) |
| 出版者: | Oxford University Press;London: Oxford University Press |
| 摘要: | 摘要： We present an analysis of the maximum light, near‐ultraviolet (NUV; 2900 < λ < 5500 Å) spectra of 32 low‐redshift (0.001 < z < 0.08) Type Ia supernovae (SNe Ia), obtained with the Hubble Space Telescope (HST) using the Space Telescope Imaging Spectrograph. We combine this spectroscopic sample with high‐quality gri light curves obtained with robotic telescopes to measure SN Ia photometric parameters, such as stretch (light‐curve width), optical colour and brightness (Hubble residual). By comparing our new data to a comparable sample of SNe Ia at intermediate redshift (0.4 < z < 0.9), we detect modest spectral evolution (3σ), in the sense that our mean low‐redshift NUV spectrum has a depressed flux compared to its intermediate‐redshift counterpart. We also see a strongly increased dispersion about the mean with decreasing wavelength, confirming the results of earlier surveys. We show that these trends are consistent with changes in metallicity as predicted by contemporary SN Ia spectral models. We also examine the properties of various NUV spectral diagnostics in the individual SN spectra. We find a general correlation between SN stretch and the velocity (or position) of many NUV spectral features. In particular, we observe that higher stretch SNe have larger Ca ii H&K velocities, which also correlate with host galaxy stellar mass. This latter trend is probably driven by the well‐established correlation between stretch and host galaxy stellar mass. We find no significant trends between UV spectral features and optical colour. Mean spectra constructed according to whether the SN has a positive or negative Hubble residual show very little difference at NUV wavelengths, indicating that the NUV evolution and variation we identify does not directly correlate with Hubble diagram residuals. Our work confirms and strengthens earlier conclusions regarding the complex behaviour of SNe Ia in the NUV spectral region, but suggests the correlations we find are more useful in constraining progenitor models rather than improving the use of SNe Ia as cosmological probes.
出版者： London: Oxford University Press
出版日期： 2012-11-01
出處： Monthly notices of the Royal Astronomical Society, 2012-11, Vol.426 (3), p.2359-2379
資源來源： Alma/SFX Local Collection
版權： 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
版權： Monthly Notices of the Royal Astronomical Society © 2012 RAS
識別號： ISSN: 0035-8711
識別號： EISSN: 1365-2966
識別號： DOI: 10.1111/j.1365-2966.2012.21909.x |
| 顯示於類別: | [天文研究所] 期刊論文
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