NOAO >   Observing Info >   Approved Programs >   2015A-0253

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Program Information for 2015A-0253


PI: Ryan Foley, U. of Illinois Urbana-Champaign, foley@ucsc.edu
Address: Astronomy Department, 1002 W Green St, Urbana, IL 61801 USA

CoI: Armin Rest, STScI
CoI: Daniel Scolnic, U. of Chicago
CoI: Gautham Narayan, NOAO
CoI: Yen-Chen Pan, U. of Illinois Urbana-Champaign

Title: The Next Generation Low-z Type Ia Supernova Sample for Cosmology

Abstract: Type~Ia supernovae (SNe~Ia) are one of the best probes to constrain the nature of dark energy. Recent surveys have observed such a large number of high-$z$ SNe~Ia that cosmological constraints are now limited by systematics and the relatively small number of low-$z$ SNe. We are conducting a survey to construct an unbiased, high-fidelity low-$z$ SN~Ia sample in the Pan-STARRS1 natural system to improve SN cosmology constraints. This sample will (1) double the number of cosmologically useful low-$z$ SNe~Ia, (2) be unique in its photometric calibration precision, and (3) be the only low-$z$ SN~Ia sample observed with the same system as a high-$z$ sample. This homogeneous low-$z$ sample will minimize the largest systematic error sources and with it, we will acquire a state-of-the-art constraint on the equation-of-state parameter of dark energy, $w$, to $\le$ 5\%. Here, we propose to obtain the necessary spectroscopy for this sample.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2015A):  KP-4m/KOSMOS -- 2n on Apr 20 2015, May 18 2015
Run 2 (2015A):  SOAR/Goodman -- 4n on Apr 09 2015, May 16 2015, Jun 15 2015, Jul 23 2015


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NOAO >   Observing Info >   Approved Programs >   2015A-0253

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