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Event: 'The Nearby Supernova Factory - Improving SNe Ia As Dark Energy Probes'

CENTRA Seminars
Date: Thursday, December 10, 2009 At 02:30 PM
Duration: 1 Hour
Contact Info:
Vallery Stansiehv
Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Rui Pereira (Institut de Physique Nucléaire de Lyon)
During the 2004-2008 period the Nearby Supernova Factory discovered  ~1000 supernovae, 
and obtained detailed spectrophotometric time  series of ~190 SNe Ia with the SuperNova 
Integral Field  Spectrograph. These supernovae are located in the nearby Hubble flow  (0.03 < z < 0.08),
allowing relative distance measurements with  minimal uncertainties from peculiar velocities and 
bulk flows. Each  supernova was spectrophotometrically observed over a period of ~50  days, with a median 
number of 15 observations per target. The first  spectrum is typically obtained at -4 days, and in some 
instances as  early as -14 days before maximum light. Each spectrum (3200A - 10000A) is photometrically 
calibrated, with simultaneous observations of field stars used to correct for atmospheric  extinction variability.

In this talk I will present the SNfactory project and dataset, as well as recent results impacting the use of
SNe Ia as dark energy  probes, notably a new spectral indicator able to standardize SNe Ia  with a better 
accuracy than light curve width and colour. 
Sala de Vídeo-conferência, Centro de Congressos do IST, Pavilhão de Civil, Piso 01 (-1)

IST, Campus da Alameda

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