COLOR DISPERSION AND MILKY-WAY-LIKE REDDENING AMONG TYPE Ia SUPERNOVAE

Scolnic, D.; Riess, Adam G.; Foley, R. J.; Rest, A.; Rodney, Steven A.; Brout, D.; Jones, D. O.

doi:10.1088/0004-637x/780/1/37

Cited by 211 publications

(364 citation statements)

References 35 publications

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“…This idea does not conflict with Scolnic et al (2014) which pointed out the Galactic reddening law (Rv = 3.1) can explain the trend between Hubble residuals and colours. As we show in Table 7, the reddening law (Rv = 3.3) derived from the Medium sample consistent with the Galactic reddening law.…”

Section: Other Factors Which May Have Affected the Observed Sne Ia Cosupporting

confidence: 54%

Photometric properties of intermediate-redshift Type Ia supernovae observed by the Sloan Digital Sky Survey-II Supernova Survey

Doi¹,

Yasuda²,

Kuncarayakti³

et al. 2016

Mon. Not. R. Astron. Soc.

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We have analyzed multi-band light curves of 328 intermediate redshift (0.05 ≤ z < 0.24) type Ia supernovae (SNe Ia) observed by the Sloan Digital Sky Survey-II Supernova Survey (SDSS-II SN Survey). The multi-band light curves were parameterized by using the Multi-band Stretch Method, which can simply parameterize light curve shapes and peak brightness without dust extinction models. We found that most of the SNe Ia which appeared in red host galaxies (u − r > 2.5) don't have a broad light curve width and the SNe Ia which appeared in blue host galaxies (u − r < 2.0) have a variety of light curve widths. The Kolmogorov-Smirnov test shows that the colour distribution of SNe Ia appeared in red / blue host galaxies is different (significance level of 99.9%). We also investigate the extinction law of host galaxy dust. As a result, we find the value of R v derived from SNe Ia with medium light curve width is consistent with the standard Galactic value. On the other hand, the value of R v derived from SNe Ia that appeared in red host galaxies becomes significantly smaller. These results indicate that there may be two types of SNe Ia with different intrinsic colours, and they are obscured by host galaxy dust with two different properties.

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Section: Other Factors Which May Have Affected the Observed Sne Ia Cosupporting

confidence: 54%

Photometric properties of intermediate-redshift Type Ia supernovae observed by the Sloan Digital Sky Survey-II Supernova Survey

Doi¹,

Yasuda²,

Kuncarayakti³

et al. 2016

Mon. Not. R. Astron. Soc.

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“…As a result, it will no longer pass our rise time selection criteria. (PSF), template subtracted, griz P 1 photometry is given in Rest et al (2013) and Scolnic et al (2013). For transients discovered before 2011 October, object specific deep templates were constructed from pre-explosion images.…”

Section: Ps1 Transient Photometrymentioning

confidence: 99%

Rapidly Evolving and Luminous Transients From Pan-Starrs1

Drout

Chornock

Söderberg

et al. 2014

ApJ

326

444

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In the past decade, several rapidly evolving transients have been discovered whose timescales and luminosities are not easily explained by traditional supernovae (SNe) models. The sample size of these objects has remained small due, at least in part, to the challenges of detecting short timescale transients with traditional survey cadences. Here we present the results from a search within the Pan-STARRS1 Medium Deep Survey (PS1-MDS) for rapidly evolving and luminous transients. We identify 10 new transients with a time above half-maximum (t 1/2 ) of less than 12 days and −16.5 > M > −20 mag. This increases the number of known events in this region of SN phase space by roughly a factor of three. The median redshift of the PS1-MDS sample is z = 0.275 and they all exploded in star-forming galaxies. In general, the transients possess faster rise than decline timescale and blue colors at maximum light (g P1 − r P1 −0.2). Best-fit blackbodies reveal photospheric temperatures/radii that expand/cool with time and explosion spectra taken near maximum light are dominated by a blue continuum, consistent with a hot, optically thick, ejecta. We find it difficult to reconcile the short timescale, high peak luminosity (L > 10 43 erg s −1 ), and lack of UV line blanketing observed in many of these transients with an explosion powered mainly by the radioactive decay of 56 Ni. Rather, we find that many are consistent with either (1) cooling envelope emission from the explosion of a star with a low-mass extended envelope that ejected very little (<0.03 M ) radioactive material, or (2) a shock breakout within a dense, optically thick, wind surrounding the progenitor star. After calculating the detection efficiency for objects with rapid timescales in the PS1-MDS we find a volumetric rate of 4800-8000 events yr −1 Gpc −3 (4%-7% of the core-collapse SN rate at z = 0.2).

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“…Each CCSN template defines the underlying shape and color of the synthetic light curves, which is then modified with free parameters for the date of peak, redshift, host extinction (A V ), and luminosity (Δm, the shift in magnitudes relative to the peak of the assumed luminosity function). For this work, we fix the SALT2 model parameters α = 0.135 and β = 4.1 (Scolnic et al 2014), and for all simulated CCSNe we fix the extinction law to R V = 3.1.…”

Section: The Stardust Classifiermentioning

confidence: 99%

“…The distribution of C values can therefore be described as a convolution between a narrow Gaussian (the intrinsic dispersion of SN Ia colors) and a function describing the distribution of host galaxy extinctions. Following Barbary et al (2012) and Scolnic et al (2014), we approximate the A V distributions of previous SN Ia studies by modifying the red side of the SALT2 C distribution so that the simulated SN colors match the output of that convolution.…”

Section: Host a V Distributionmentioning

confidence: 99%

TYPE Ia SUPERNOVA RATE MEASUREMENTS TO REDSHIFT 2.5 FROM CANDELS: SEARCHING FOR PROMPT EXPLOSIONS IN THE EARLY UNIVERSE

Rodney

Riess

Strolger

et al. 2014

Self Cite

160

111

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The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) was a multi-cycle treasury program on the Hubble Space Telescope (HST) that surveyed a total area of ∼0.25 deg 2 with ∼900 HST orbits spread across five fields over three years. Within these survey images we discovered 65 supernovae (SNe) of all types, out to z ∼ 2.5. We classify ∼24 of these as Type Ia SNe (SNe Ia) based on host galaxy redshifts and SN photometry (supplemented by grism spectroscopy of six SNe). Here we present a measurement of the volumetric SN Ia rate as a function of redshift, reaching for the first time beyond z = 2 and putting new constraints on SN Ia progenitor models. Our highest redshift bin includes detections of SNe that exploded when the universe was only ∼3 Gyr old and near the peak of the cosmic star formation history. This gives the CANDELS high redshift sample unique leverage for evaluating the fraction of SNe Ia that explode promptly after formation (<500 Myr). Combining the CANDELS rates with all available SN Ia rate measurements in the literature we find that this prompt SN Ia fraction is f P = 0.53 ±0.09 stat0.10 ±0.10 sys0.26 , consistent with a delay time distribution that follows a simple t −1 power law for all times t > 40 Myr. However, mild tension is apparent between ground-based low-z surveys and space-based high-z surveys. In both CANDELS and the sister HST program CLASH (Cluster Lensing And Supernova Survey with Hubble), we find a low rate of SNe Ia at z > 1. This could be a hint that prompt progenitors are in fact relatively rare, accounting for only 20% of all SN Ia explosions-though further analysis and larger samples will be needed to examine that suggestion.

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COLOR DISPERSION AND MILKY-WAY-LIKE REDDENING AMONG TYPE Ia SUPERNOVAE

Cited by 211 publications

References 35 publications

Photometric properties of intermediate-redshift Type Ia supernovae observed by the Sloan Digital Sky Survey-II Supernova Survey

Photometric properties of intermediate-redshift Type Ia supernovae observed by the Sloan Digital Sky Survey-II Supernova Survey

Rapidly Evolving and Luminous Transients From Pan-Starrs1

TYPE Ia SUPERNOVA RATE MEASUREMENTS TO REDSHIFT 2.5 FROM CANDELS: SEARCHING FOR PROMPT EXPLOSIONS IN THE EARLY UNIVERSE

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