scholarly journals Supernova Legacy Survey: using spectral signatures to improve Type Ia supernovae as distance indicators

2010 ◽  
Vol 410 (2) ◽  
pp. 1262-1282 ◽  
Author(s):  
E. S. Walker ◽  
I. M. Hook ◽  
M. Sullivan ◽  
D. A. Howell ◽  
P. Astier ◽  
...  
Keyword(s):  
Type Ia Supernovae ◽  
Spectral Signatures ◽  
Type Ia ◽  
Ia Supernovae ◽  
Distance Indicators

scholarly journals Theoretical Light Curves for Type Ia Supernovae and Determination of the Hubble Constant

1999 ◽  
Vol 183 ◽  
pp. 68-68
Author(s):  
Koichi Iwamoto ◽  
Ken'Ichi Nomoto
Keyword(s):  
Hubble Constant ◽  
Light Curves ◽  
Type Ia Supernovae ◽  
Maximum Brightness ◽  
Decline Rate ◽  
Type Ia ◽  
Error Bars ◽  
Ia Supernovae ◽  
Distance Indicators

The large luminosity (MV ≈ −19 ∼ −20) and the homogeneity in light curves and spectra of Type Ia supernovae(SNe Ia) have led to their use as distance indicators ultimately to determine the Hubble constant (H0). However, an increasing number of the observed samples from intermediate- and high-z (z ∼ 0.1 − 1) SN Ia survey projects(Hamuy et al. 1996, Perlmutter et al. 1997) have shown that there is a significant dispersion in the maximum brightness (∼ 0.4 mag) and the brighter-slower correlation between the brightness and the postmaximum decline rate, which was first pointed out by Phillips(1993). By taking the correlation into account, Hamuy et al.(1996) gave an estimate of H0 within the error bars half as much as previous ones.

scholarly journals SALT2: using distant supernovae to improve the use of type Ia supernovae as distance indicators

2007 ◽  
Vol 466 (1) ◽  
pp. 11-21 ◽  
Author(s):  
J. Guy ◽  
P. Astier ◽  
S. Baumont ◽  
D. Hardin ◽  
R. Pain ◽  
...  
Keyword(s):  
Type Ia Supernovae ◽  
Type Ia ◽  
Ia Supernovae ◽  
Distance Indicators

scholarly journals Lick Observatory Supernova Search follow-up program: photometry data release of 93 Type Ia supernovae

2019 ◽  
Vol 490 (3) ◽  
pp. 3882-3907 ◽  
Author(s):  
Benjamin E Stahl ◽  
WeiKang Zheng ◽  
Thomas de Jaeger ◽  
Alexei V Filippenko ◽  
Andrew Bigley ◽  
...  
Keyword(s):  
Light Curves ◽  
Type Ia Supernovae ◽  
Data Set ◽  
Future Studies ◽  
Processing Pipeline ◽  
Type Ia ◽  
Template Fitting ◽  
Ia Supernovae ◽  
Distance Indicators

ABSTRACT We present BVRI and unfiltered light curves of 93 Type Ia supernovae (SNe Ia) from the Lick Observatory Supernova Search (LOSS) follow-up program conducted between 2005 and 2018. Our sample consists of 78 spectroscopically normal SNe Ia, with the remainder divided between distinct subclasses (3 SN 1991bg-like, 3 SN 1991T-like, 4 SNe Iax, 2 peculiar, and 3 super-Chandrasekhar events), and has a median redshift of 0.0192. The SNe in our sample have a median coverage of 16 photometric epochs at a cadence of 5.4 d, and the median first observed epoch is ∼4.6 d before maximum B-band light. We describe how the SNe in our sample are discovered, observed, and processed, and we compare the results from our newly developed automated photometry pipeline to those from the previous processing pipeline used by LOSS. After investigating potential biases, we derive a final systematic uncertainty of 0.03 mag in BVRI for our data set. We perform an analysis of our light curves with particular focus on using template fitting to measure the parameters that are useful in standardizing SNe Ia as distance indicators. All of the data are available to the community, and we encourage future studies to incorporate our light curves in their analyses.

scholarly journals Calibrating Hydrogen-Rich Core-Collapse Supernovae for their Use as Distance Indicators Independent of Type Ia Supernovae

2011 ◽  
Vol 7 (S281) ◽  
pp. 32-33
Author(s):  
M. L. Pumo ◽  
L. Zampieri
Keyword(s):  
Light Curve ◽  
Photometric Data ◽  
Type Ia Supernovae ◽  
Radiation Hydrodynamics ◽  
Core Collapse ◽  
Type Ia ◽  
General Relativistic ◽  
Ia Supernovae ◽  
Distance Indicators

AbstractUsing our new general-relativistic, radiation hydrodynamics, Lagrangian code, we computed a rather extended grid of hydrogen-rich core-collapse supernovae (CC-SNe) models and explored the potentials of their “standardization” as distance indicators. We discuss the properties of some calibrations previously reported in the literature, and present new correlations based on the behavior of the light curve that can be employed for calibrating hydrogen-rich CC-SNe using only photometric data.

scholarly journals Type Ia supernovae as extragalactic distance indicators

2012 ◽  
Vol 8 (S289) ◽  
pp. 327-327
Author(s):  
Brian P. Schmidt
Keyword(s):  
State Of The Art ◽  
High Redshift ◽  
Type Ia Supernovae ◽  
Unique Combination ◽  
Cosmic Expansion ◽  
Current State ◽  
Type Ia ◽  
Ia Supernovae ◽  
High Redshift Universe ◽  
Distance Indicators

AbstractType Ia supernovae (SNe Ia) are among cosmology's most useful tools for measuring extragalactic distances. Their intrinsic brightness, MV=−19.2 mag, and precision, σ=0.12 mag, make for a unique combination to precisely probe cosmic expansion from the nearby to the high-redshift Universe. I describe the current state of the art for measuring distances to SNe Ia—focusing on the current challenges which ultimately limit their precision—as well as prospects for further refinement. I also highlight cosmological applications where they have been especially valuable, and briefly review some future projects which plan to exploit SNe Ia.

scholarly journals Type Ia Supernovae as Extragalactic Distance Indicators

1997 ◽  
pp. 715-734 ◽  
Author(s):  
David Branch ◽  
Peter Nugent ◽  
Adam Fisher
Keyword(s):  
Type Ia Supernovae ◽  
Type Ia ◽  
Ia Supernovae ◽  
Distance Indicators

scholarly journals NEW MASS LIMIT OF WHITE DWARFS

2013 ◽  
Vol 22 (12) ◽  
pp. 1342004 ◽  
Author(s):  
UPASANA DAS ◽  
BANIBRATA MUKHOPADHYAY
Keyword(s):  
Paradigm Shift ◽  
White Dwarfs ◽  
Type Ia Supernovae ◽  
Mass Limit ◽  
Type Ia ◽  
Ia Supernovae ◽  
Distance Indicators ◽  
The Way

Is the Chandrasekhar mass limit for white dwarfs (WDs) set in stone? Not anymore, recent observations of over-luminous, peculiar type Ia supernovae can be explained if significantly super-Chandrasekhar WDs exist as their progenitors, thus barring them to be used as cosmic distance indicators. However, there is no estimate of a mass limit for these super-Chandrasekhar WD candidates yet. Can they be arbitrarily large? In fact, the answer is no! We arrive at this revelation by exploiting the flux freezing theorem in observed, accreting, magnetized WDs, which brings in Landau quantization of the underlying electron degenerate gas. This essay presents the calculations which pave the way for the ultimate (significantly super-Chandrasekhar) mass limit of WDs, heralding a paradigm shift 80 years after Chandrasekhar's discovery.

Are Type Ia Supernovae Reliable Distance Indicators?

2007 ◽  
Vol 7 (5) ◽  
pp. 649-656
Author(s):  
Lian-Zhong Lü ◽  
Yi-Ping Qin ◽  
Fu-Wen Zhang
Keyword(s):  
Type Ia Supernovae ◽  
Type Ia ◽  
Ia Supernovae ◽  
Distance Indicators

scholarly journals Exploring the global properties of Type Ia supernovae

2006 ◽  
Vol 2 (14) ◽  
pp. 312-312
Author(s):  
Paolo Mazzali
Keyword(s):  
Research Training ◽  
Quality Data ◽  
Type Ia Supernovae ◽  
High Quality Data ◽  
Type Ia ◽  
Heated Debate ◽  
Supernova Explosions ◽  
The Subject ◽  
Ia Supernovae ◽  
Distance Indicators

AbstractWhile Type Ia supernovae are widely used as distance indicators, the reasons for the correlation between luminosity and light curve width that allows SNe Ia to be calibratable standard candles is not yet fully understood, and in particular the details of the explosion mechanism are still the subject of heated debate. We present the results of a systematic approach that uses the high-quality data collected by the European Research Training Network “The Physics of Type Ia Supernova Explosions” to map the supernova ejecta and to infer the properties of the explosion.

scholarly journals Berkeley supernova Ia program: data release of 637 spectra from 247 Type Ia supernovae

2020 ◽  
Vol 492 (3) ◽  
pp. 4325-4343 ◽  
Author(s):  
Benjamin E Stahl ◽  
WeiKang Zheng ◽  
Thomas de Jaeger ◽  
Thomas G Brink ◽  
Alexei V Filippenko ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Early Time ◽  
Type Ia Supernovae ◽  
Late Time ◽  
Data Set ◽  
Spectral Signatures ◽  
Quantitative Measurements ◽  
Type Ia ◽  
Ia Supernovae ◽  
Program Data

ABSTRACT We present 637 low-redshift optical spectra collected by the Berkeley Supernova Ia Program (BSNIP) between 2009 and 2018, almost entirely with the Kast double spectrograph on the Shane 3 m telescope at Lick Observatory. We describe our automated spectral classification scheme and arrive at a final set of 626 spectra (of 242 objects) that are unambiguously classified as belonging to Type Ia supernovae (SNe Ia). Of these, 70 spectra of 30 objects are classified as spectroscopically peculiar (i.e. not matching the spectral signatures of ‘normal’ SNe Ia) and 79 SNe Ia (covered by 328 spectra) have complementary photometric coverage. The median SN in our final set has one epoch of spectroscopy, has a redshift of 0.0208 (with a low of 0.0007 and high of 0.1921), and is first observed spectroscopically 1.1 d after maximum light. The constituent spectra are of high quality, with a median signal-to-noise ratio of 31.8 pixel−1, and have broad wavelength coverage, with $\sim\! 95{{\ \rm per\ cent}}$ covering at least 3700–9800 Å. We analyse our data set, focusing on quantitative measurements (e.g. velocities, pseudo-equivalent widths) of the evolution of prominent spectral features in the available early-time and late-time spectra. The data are available to the community, and we encourage future studies to incorporate our spectra in their analyses.

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