K-Corrections and Spectral Templates of Type Ia Supernovae

By E. Hsiao, A. Conley, D. Howell, M. Sullivan, C. Pritchet, R. Carlberg, P. Nugent, M. Phillips. 2007

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With the advent of large dedicated Type Ia supernova (SN Ia) surveys, K-corrections of SNe Ia and their uncertainties have become especially important in the determination of cosmological parameters. While K-corrections are largely driven by SN Ia broadband colors, it is shown here that the diversity in spectral features of SNe Ia can also be important. For an individual observation, the statistical errors from the inhomogeneity in spectral features range from 0.01 (where the observed and rest-frame filters are aligned) to 0.04 (where the observed and rest-frame filters are misaligned). To minimize the systematic errors caused by an assumed SN Ia spectral energy distribution (SED), we outline a prescription for deriving a mean spectral template time series that incorporates a large and heterogeneous sample of observed spectra. We then remove the effects of broadband colors and measure the remaining uncertainties in the K-corrections associated with the diversity in spectral features. Finally, we present a template spectroscopic sequence near maximum light for further improvement on the K-correction estimate. A library of ~600 observed spectra of ~100 SNe Ia from heterogeneous sources is used for the analysis.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/c6b5749e96eeac34f6d6c0c1add39324deca154a

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Citations in the corpus

Spectrophotometric time series of SN 2011fe from the Nearby Supernova Factory (2013, methodology): “To contrast, we refer the reader to a similar comparison of SN 2009ig and the Hsiao et al. (2007) template by Foley et al. (2012a).”
THE SLOAN DIGITAL SKY SURVEY-II SUPERNOVA SURVEY: SEARCH ALGORITHM AND FOLLOW-UP OBSERVATIONS (2007, unknown): “…et al. 1996; Nugent et al. 2002; 1http://www.cfht.hawaii.edu/SNLS 2http://www.ctio.noao.edu/essence 3http://astro.berkeley.edu/b̃ait/kait.html 4http://csp1.lco.cl/ cspuser1/PUB/CSP.html 5http://snfactory.lbl.gov/ 6http://cfa-www.harvard.edu/oir/Research/supernova/SNgroup.html Hsiao et al. 2007).”
THE CARNEGIE SUPERNOVA PROJECT: LIGHT-CURVE FITTING WITH SNooPy (2010, methodology): “The procedure we adopt for doing this is effectively the same as that used by Hsiao et al. (2007), which we shall briefly outline here.”
THE CARNEGIE SUPERNOVA PROJECT: ANALYSIS OF THE FIRST SAMPLE OF LOW-REDSHIFT TYPE-Ia SUPERNOVAE (2009, methodology): “The Hsiao et al. (2007) spectral template may be used to calculate the expected magnitude of these combined effects, which is plotted as a dotted line in both of the top panels of Figure 12.”
FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II SUPERNOVA RESULTS: HUBBLE DIAGRAM AND COSMOLOGICAL PARAMETERS (2009, methodology): “For each iteration, an epoch-dependent SN Ia SED from Hsiao et al. (2007) is warped so that the synthetic colors of the warped SED match the mlcs2k2 model colors at the corresponding rest-frame epoch.”
RADIATIVE TRANSFER SIMULATIONS OF NEUTRON STAR MERGER EJECTA (2013, background): “Figure 14 shows the computed optical spectra at different epochs compared with the template spectra (Hsiao et al. 2007) in the corresponding phase.”
The Supernova Legacy Survey 3-year sample: Type Ia supernovae photometric distances and cosmological constraints , (2010, methodology): “Those differences can be attributed to some discrepancies in the spectral sequences used (that of SALT2 and the one derived by Hsiao et al. 2007), as the spectral distortions performedin SiFTO do not compensate for differences of fluxes on a wavelength range much shorter than the gaps between…”
IMPROVED DARK ENERGY CONSTRAINTS FROM ∼100 NEW CfA SUPERNOVA TYPE Ia LIGHT CURVES (2009, unknown): “Hsiao et al. (2007) presents an improved SN Ia spectral template, but rather than using this, SALT2 has a colorand stretch-dependent model spectrum derived from a sample of nearby and faraway SN Ia spectra and light curves.”
THE HUBBLE SPACE TELESCOPE CLUSTER SUPERNOVA SURVEY. V. IMPROVING THE DARK-ENERGY CONSTRAINTS ABOVE z > 1 AND BUILDING AN EARLY-TYPE-HOSTED SUPERNOVA SAMPLE (2011, methodology): “Model PSFs for the supernovae are obtained with the TinyTim software using supernova SED templates from Hsiao et al. (2007) redshifted to the supernova redshift and warped as a function of wavelength to match the photometry.”
TYPE Ia SUPERNOVA LIGHT CURVE INFERENCE: HIERARCHICAL MODELS IN THE OPTICAL AND NEAR-INFRARED (2010, methodology): “As a high-quality SED time sequence is seldom available for all SNe, particularly at higher redshifts, we use the average spectral template sequence from Hsiao et al. (2007).”
Measuring the Hubble constant with Type Ia supernovae as near-infrared standard candles (2017, methodology): “We take the published J-band photometry, correct for Milky Way extinction using the dust maps of Schlafly & Finkbeiner (2011), and apply a K-correction using the SED sequence of Hsiao et al. (2007) calculated with the SNooPy package (Burns et al. 2011).”
Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples (2014, methodology): “…dispersion remain the same in both cases, the changes proposed in S14 are not expected to significantly 7 H-C11 definition: H refers to the Hsiao et al. (2007) spectral sequence that is modified with time stretching and the G10 color law; C11 refers to the intrinsic scatter model based on…”
THE SPECTROSCOPIC DIVERSITY OF TYPE Ia SUPERNOVAE (2000, methodology): “We have run simulations based on the SN Ia spectral template of Hsiao et al. (2007) that show that even for spectra extending only down to 3750 Å the error on the inferred B − V color is less than 0.005mag, so we include all the 1994-2008 FAST spec- Diversity of SN Ia Spectra 5 tra in the…”
The Carnegie Supernova Project I: analysis of stripped-envelope supernova light curves (2017, methodology): “The K corrections were computed following the method described by Hsiao et al. (2007).”
SNLS3: CONSTRAINTS ON DARK ENERGY COMBINING THE SUPERNOVA LEGACY SURVEY THREE-YEAR DATA WITH OTHER PROBES (2011, methodology): “…better understanding of SN Ia light curve and spectral properties (particularly at λ<3600Å in the rest-frame) with a corresponding improvement in the methods for estimating their distances (Hsiao et al. 2007; Guy et al. 2007; Ellis et al. 2008; Conley et al. 2008), and handling their colors (G10).”