Subaru FOCAS Spectroscopic Observations of High-Redshift Supernovae (2009)
Morokuma, Tomoki, Tokita, Kouichi, Lidman, Christopher, Doi, Mamoru, Yasuda, Naoki, Aldering, Greg, ...
We present spectra of high-redshift supernovae (SNe) that were taken with the Subaru low resolution optical spectrograph, FOCAS. These SNe were found in SN surveys with Suprime-Cam on Subaru, the...
Type II-P Supernovae from the SDSS-II Supernova Survey and the Standardized Candle Method (2009)
D'Andrea, Chris B., Sako, Masao, Dilday, Benjamin, Frieman, Joshua A., Holtzman, Jon, Kessler, Richard, ...
We apply the Standardized Candle Method (SCM) for Type II Plateau supernovae (SNe II-P), which relates the velocity of the ejecta of a SN to its luminosity during the plateau, to 15 SNe II-P...
Weighing dark matter haloes with gravitationally lensed supernovae (2009)
Jonsson, Jakob, Dahlen, Tomas, Hook, Isobel, Goobar, Ariel, Mortsell, Edvard
High redshift Type Ia supernovae (SNe Ia) are likely to be gravitationally lensed by dark matter haloes of galaxies in the foreground. Since SNe Ia have very small dispersion after light curve shape...
Type II Supernovae as Probes of Cosmology (2009)
Poznanski, Dovi, Baron, Eddie, Blondin, Stephane, Bloom, Joshua S., D'Andrea, Christopher B., Della Valle, Massimo, ...
- Constraining the cosmological parameters and understanding Dark Energy have tremendous implications for the nature of the Universe and its physical laws. - The pervasive limit of systematic...
Low R_v from circumstellar dust around supernovae (2008)
The effective extinction law for supernovae surrounded by circumstellar dust is examined by Monte-Carlo simulations. Grains with light scattering properties as for interstellar dust in the Milky-Way...
First-Year spectroscopy for the SDSS-II Supernova Survey (2008)
Zheng, Chen, Romani, Roger, Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
Also archived in: arXiv:0802.3220 v1 Feb 21 2008
First-Year Spectroscopy for the SDSS-II Supernova Survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band light curves of...
Quantifying systematic uncertainties in supernova cosmology (2008)
Nordin, Jakob, Goobar, Ariel, Jonsson, Jakob
Observations of Type Ia supernovae used to map the expansion history of the Universe suffer from systematic uncertainties that need to be propagated into the estimates of cosmological parameters. We...
The Sloan Digital Sky Survey-II Supernova Survey: technical summary (2008)
Frieman, Joshua, Bassett, Bruce, Becker, Andrew, Choi, Changsu, Cinabro, David, DeJongh, Fritz, ...
Also archived in: arXiv:0708.2749 v1 Aug 21 2007
The sloan digital sky survey-II supernova survey: technical summary (2008)
Frieman, Joshua A., Bassett, Bruce, Becker, Andrew, Choi, Changsu, Cinabro, David, DeJongh, Fritz, ...
First-year spectroscopy for the sloan digital sky survey - II. Supernova survey (2008)
Zheng, Chen, Romani, Roger W., Sako, Masao, Marriner, John, Bassett, Bruce, Becker, Andrew, ...
Improved cosmological constraints from new, old, and combined supernova data sets (2008)
Kowalski, M., Rubin, D., Aldering, G., Agostinho, R. J., Amadon, A., Amanullah, R., ...
We present a new compilation of Type Ia supernovae (SNe Ia), a new data set of low-redshift nearby-Hubble-flow SNe, and new analysis procedures to work with these heterogeneous compilations. This...
Improved cosmological constraints from new, old, and combined supernova data sets (2008)
Kowalski, M., Rubin, D., Aldering, G., Agostinho, R. J., Amadon, A., Amanullah, R., ...
We present a new compilation of Type Ia supernovae (SNe Ia), a new data set of low-redshift nearby-Hubble-flow SNe, and new analysis procedures to work with these heterogeneous compilations. This...
The colour-lightcurve shape relation of Type Ia supernovae and the reddening law (2007)
A study of the time sequence of optical colours of a large sample of nearby Type Ia supernovae (SNe Ia) is presented. We study the dependence of the colour time evolution with respect to the...
Extinction properties of lensing galaxies (2007)
Ostman, Linda, Goobar, Ariel, Mortsell, Edvard
Context. Observations of quasars shining through foreground galaxies, offer a way to probe the dust extinction curves of distant galaxies. Interesting objects for this study are found in strong...
Nearby Photometry, Alex Kim, Ariel Goobar, Saul Perlmutter
Photometric measurements show that, as a group, nearby Type Ia supernovae follow similar light curves and reach similar peak magnitudes (Branch & Tammann 1992). Thus, these supernovae may serve...
Testing the DGP model with ESSENCE (2007)
Rydbeck, Sara, Fairbairn, Malcolm, Goobar, Ariel
We use the recent supernova data set from the ESSENCE collaboration combined with data from the Supernova Legacy Survey and nearby supernovae to test the DGP brane world model and its...
Tentative detection of the gravitational magnification of type Ia supernovae (2006)
Jonsson, Jakob, Dahlen, Tomas, Goobar, Ariel, Mortsell, Edvard, Riess, Adam
The flux from distant type Ia supernovae (SN) is likely to be amplified or de-amplified by gravitational lensing due to matter distributions along the line-of-sight. A gravitationally lensed SN would...
Tuning Gravitationally Lensed Standard Sirens (2006)
Jonsson, Jakob, Goobar, Ariel, Mortsell, Edvard
Gravitational waves emitted by chirping supermassive black hole binaries could in principle be used to obtain very accurate distance determinations. Provided they have an electromagnetic counterpart...
Goobar, Ariel, Hannestad, Steen, Mortsell, Edvard, Tu, Huitzu
We have studied bounds on the neutrino mass using new data from the WMAP 3 year data, the Sloan Digital Sky Survey measurement of the baryon acoustic peak, the Type Ia supernovae from SNLS, and the...
Supernova limits on brane world cosmology (2005)
Fairbairn, Malcolm, Goobar, Ariel
By combining the first year data from the Supernova Legacy Survey (SN LS) and the recent detection of the baryon acoustic peak in the Sloan Digital Sky Survey data, we are able to place strong...
Trends in Space Astronomy and Cosmic Vision 2015-2025 (2005)
Turon, Catherine, Done, Chris, Quirrenbach, Andreas, Schneider, Peter, Aerts, Conny, Bazzano, Angela, ...
As a short introduction to the astronomy session, the response of the community to the Call for Themes issued by ESA and the specific themes selected by the Astronomy Working Group are briefly...
Trends in Space Astronomy and Cosmic Vision 2015-2025 (2005)
Turon, Catherine, Done, Chris, Quirrenbach, Andreas, Schneider, Peter, Aerts, Conny, Bazzano, Angela, ...
As a short introduction to the astronomy session, the response of the community to the Call for Themes issued by ESA and the specific themes selected by the Astronomy Working Group are briefly...
Trends in Space Astronomy and Cosmic Vision 2015-2025 (2005)
Turon, Catherine, Done, Chris, Quirrenbach, Andreas, Schneider, Peter, Aerts, Conny, Bazzano, Angela, ...
As a short introduction to the astronomy session, the response of the community to the Call for Themes issued by ESA and the specific themes selected by the Astronomy Working Group are briefly...
Trends in Space Astronomy and Cosmic Vision 2015-2025 (2005)
Turon, Catherine, Done, Chris, Quirrenbach, Andreas, Schneider, Peter, Aerts, Conny, Bazzano, Angela, ...
To be published in the proceedings of the 2005 ESLAB Symposium "Trends in Space Science and Cosmic Vision 2020", held at ESTEC, 19-21 April 2005, F. Favata (ed).
Corrections for gravitational lensing of supernovae: better than average? (2005)
Gunnarsson, Christofer, Dahlen, Tomas, Goobar, Ariel, Jonsson, Jakob, Mortsell, Edvard
We investigate the possibility of correcting for the magnification due to gravitational lensing of standard candle sources, such as Type Ia supernovae. Our method uses the observed properties of the...
Lensing magnification of supernovae in the GOODS-fields (2005)
Jonsson, Jakob, Dahlen, Tomas, Goobar, Ariel, Gunnarsson, Christofer, Mortsell, Edvard, Lee, Kyoungsoo
Gravitational lensing of high-redshift supernovae is potentially an important source of uncertainty when deriving cosmological parameters from the measured brightness of Type Ia supernovae,...
Trends in Space Astronomy and Cosmic Vision 2015-2025 (2005)
Turon, Catherine, Done, Chris, Quirrenbach, Andreas, Schneider, Peter, Aerts, Conny, Bazzano, Angela, ...
As a short introduction to the astronomy session, the response of the community to the Call for Themes issued by ESA and the specific themes selected by the Astronomy Working Group are briefly...
Trends in Space Astronomy and Cosmic Vision 2015-2025 (2005)
Turon, Catherine, Done, Chris, Quirrenbach, Andreas, Schneider, Peter, Aerts, Conny, Bazzano, Angela, ...
As a short introduction to the astronomy session, the response of the community to the Call for Themes issued by ESA and the specific themes selected by the Astronomy Working Group are briefly...
Constraints on intergalactic dust from quasar colours (2003)
Mortsell, Edvard, Goobar, Ariel
Colour measurements of quasars are used to constrain the abundance and properties of intergalactic dust and the related extinction effects on high-z sources. For Type Ia supernovae at z = 1, we...
Constraining photon-axion oscillations using quasar spectra (2003)
Mortsell, Edvard, Goobar, Ariel
Using quasar spectra from the SDSS survey, we constrain the possibility of photon-axion oscillations as a source of dimming of high redshift objects. Such a process has been suggested as an...
Massive galaxy clusters as gravitational telescopes for distant supernovae (2002)
Gunnarsson, Christofer, Goobar, Ariel
We investigate the potential of using massive clusters as gravitational telescopes for searches and studies of supernovae of Type Ia and Type II in optical and near-infrared bands at central...
Photon-axion oscillations and Type Ia supernovae (2002)
Mortsell, Edvard, Bergstrom, Lars, Goobar, Ariel
We compute the probability of photon-axion oscillations in the presence of both intergalactic magnetic fields and an electron plasma and investigate the effect on Type Ia supernovae observations. The...
Selection of high-z supernovae candidates (2002)
Deep, ground based, optical wide-field supernova searches are capable of detecting a large number of supernovae over a broad redshift range up to z~1.5. While it is practically unfeasible to obtain...
Measuring the properties of extragalactic dust and implications for the Hubble diagram (2002)
Goobar, Ariel, Bergstrom, Lars, Mortsell, Edvard
Scattering and absorption of light by a homogeneous distribution of intergalactic large dust grains has been proposed as an alternative, non-cosmological explanation for the faintness of Type Ia...
Gravitational lensing of the farthest known supernova SN1997ff (2001)
Moertsell, Edvard, Gunnarsson, Christofer, Goobar, Ariel
We investigate the effects of gravitational lensing due to intervening galaxies on the recently discovered Type Ia supernova at z=1.7, SN1997ff, in the Hubble Deep Field North. We find that it is...
Lensing effects in an inhomogeneous universe (1999)
Bergstrom, Lars, Goliath, Martin, Goobar, Ariel, Moertsell, Edvard
Recently, Holz & Wald have presented a new method for determining gravitational lensing effects on, e.g., supernova luminosity versus redshift measurements in inhomogeneous universes. In this paper,...
Perlmutter, Saul, Gabi, S., Goldhaber, G., Goobar, Ariel, Groom, Donald E., Hook, Isobel, ...
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...
Kim, Alex G., Gabi, S., Goldhaber, G., Groom, Donald E., Hook, Isobel, Kim, Min Kook, ...
The Supernova Cosmology Project has discovered over 28 supernovae (SNs) at 0.35 < z < 0.65 in an ongoing program that uses Type Ia SNs (SN Ia's) as high-redshift distance indicators. Here we...
Perlmutter, Saul, Gabi, S., Goldhaber, G., Goobar, Ariel, Groom, Donald E., Hook, Isobel, ...
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...
Kim, Alex G., Gabi, S., Goldhaber, G., Groom, Donald E., Hook, Isobel, Kim, Min Kook, ...
The Supernova Cosmology Project has discovered over 28 supernovae (SNs) at 0.35 < z < 0.65 in an ongoing program that uses Type Ia SNs (SN Ia's) as high-redshift distance indicators. Here we...
The type Ia supernova rate at z similar to 0.4 (1996)
Pain, Reynald, Hook, Isobel, Deustua, Susana E., Gabi, S., Goldhaber, G., Groom, Donald E., ...
We present the first measurement of the rate of Type la supernovae at high redshift. The result is derived by using a large subset of data from the Supernova Cosmology Project. Three supernovae were...
The type Ia supernova rate at z similar to 0.4 (1996)
Pain, Reynald, Hook, Isobel, Deustua, Susana E., Gabi, S., Goldhaber, G., Groom, Donald E., ...
We present the first measurement of the rate of Type la supernovae at high redshift. The result is derived by using a large subset of data from the Supernova Cosmology Project. Three supernovae were...
Goobar, Ariel, Perlmutter, Saul
We explore the feasibility of resurrecting the apparent magnitude-redshift relation for a ``standard candle'' to measure the cosmological constant and mass density. We show that type Ia supernovae,...
Kim, Alex, Goobar, Ariel, Perlmutter, Saul
Photometric measurements show that as a group nearby type Ia supernovae follow similar lightcurves and reach similar peak magnitudes Thus, these supernovae can serve as standard candles or calibrated...
We explore the feasibility of resurrecting the apparent magnitude-redshift relation for a "standard candle" to measure the cosmological constant and mass density. We show that type Ia...