Detail for Program: GS-2015B-Q-7

Program: GS-2015B-Q-7

Title:

DES Supernova Cosmology (South)

PI:

Ryan Foley

Co-I(s):

Matthew Smith, Rollin Thomas, Josh Frieman, Mark Sullivan, Michael Childress, Chris Lidman, Rick Kessler, Chris Smith, William Wester, Dan Scolnic, Ricardo Covarrubias, Tamara Davis, Luiz da Costa, Chris D'Andrea, Alex Kim, Masao Sako, Fang Yuan

Abstract

For measuring the nature of dark energy, Type Ia supernovae (SN Ia) are currently limited by the poorly constrained redshift evolution of SN Ia intrinsic colors. Current constraints allow for a large, 10% bias in the measurement of the equation-of-state parameter for dark energy. Luckily, a SN's ejecta velocity is highly correlated with its intrinsic color, but uncorrelated with other properties such as luminosity. With Gemini spectroscopy, we can measure the ejecta velocity for a sample of high-z SNe Ia and determine if SN Ia intrinsic color evolves, on average, with redshift. With these data, we can correct for any potential bias to a subdominant level. This program is critical for the success of both the SN component and the entirety of DES.

Publications using this program's data

[data] [ADS] DES15E2mlf: a spectroscopically confirmed superluminous supernova that exploded 3.5 Gyr after the big bang

[data] [ADS] First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant

[data] [ADS] Superluminous supernovae from the Dark Energy Survey

[data] [ADS] First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters

[data] [ADS] First cosmology results using Type IA supernovae from the dark energy survey: effects of chromatic corrections to supernova photometry on measurements of cosmological parameters

[data] [ADS] Weak lensing of Type Ia Supernovae from the Dark Energy Survey

[data] [ADS] First Cosmology Results using Supernovae Ia from the Dark Energy Survey: Survey Overview, Performance, and Supernova Spectroscopy