The LBNL Supernova Cosmology Program

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The LBNL Supernova Cosmology Program

• Supernova Cosmology Project (SCP)
• Supernova Factory (SNfactory)
• Support studies in common
• Director's
  Review of the Physics Division
• Lifan Wang
• Nov. 5, 2003

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The Supernova Cosmology Project

• LBNL G. Aldering, H. Agarval, A. Conley, E.
  Commins, V. Fadeyev, R. Gibbons,
  G. Goldhaber, D. E. Groom, A. G. Kim,
  B. C. Lee, P. E. Nugent, C. R. Pennypacker,
  S. Perlmutter (P. I.), M. Schezer,
  A. L. Spadafora, R. Thomas, R. Vogel,
  L. Wang, W. M. Wood-Vasey
• Other collaborators at
• Vanderbilt, IN2P3/Paris, Tokyo, Oxford, ESO,
  STScI, Stockholm, Barcelona

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SCP - an exceptional year

• Observing campaign No. 1
• Subaru Deep Search - 14 nights of Subaru 8.3
  meter
• Search campaign in Fall 2002 29 SNe found
• VLTFORS2, Keck IIESI, and Gemini spectroscopy
• Discovery of 13 SN Ia with redshifts 0.57 1.30
• 5 of these 29 SNe are followed by the HST

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SCP - an exceptional year

• Observing campaign No. 2
• Canadian France Hawaii Telescope /SuperNova
  Legacy Survey (SNLS)
• SNLS goal 600 well measured SNe at 0.3with multi-color light curves
• The SCP spectroscopic data are obtained at
  KeckDEIMOS in conjunction with the DEEP2 survey,
  and GEMINI
• SNLS has discovered a total of 29 confirmed Ia so
  far, 59 with spectroscopic data, over 150 SN
  candidates

i'-filter light curve of several SNLS discovered
SNe
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SCP - an exceptional year
A KeckDEIMOS run was successfully completed in
May 2003. Here is an example of an SN candidate
observed by KeckDEIMOS with a standard DEEP
mask, compared to that of the spectrum of a
nearby Type Ia SN 1999ee.
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SCP - an exceptional year
Observing campaign No.3 HST deep search

• We are granted a total of 120 HST
  orbits to search and follow up SNe at z
  1.2 - 1.6
• 60 orbits will be used for SN search,
  the other 60 will be used for multi-color
  light curve studies of 3 SNe.
• These observations add to the Subaru
  search in building up a sample of
  highest redshift SNe for studying the
  deceleration of the universe at higher
  redshift.

The entire northern GOODS field will be searched
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SCP - an exceptional year

• Scientific Results
• The Hubble diagram of Type Ia supernovae as a
  function of host galaxy morphology
• (Sullivan et al. MNRaS, 340, 1057, 2003)
• Multicolor light curves of Type Ia Supernovae on
  the color-magnitude diagram
• A novel step toward more precise
  distance and extinction estimates
• (Wang, Goldhaber, Aldering,
  Perlmutter ApJ, 590, 944, 2003)
• New constraints on ????M, and w from an
  independent set of 11 high-redshift
• supernovae observed with HST (Knop et al.
  ApJ, in press, 2003)
• Direct spectroscopic analysis of SN 1999aa
• Direct spectroscopic analysis of pre-maximum
  spectra of SN 1999ac
• A new set of spectral indicators for Type Ia
  supernovae
• Sensitivity to analysis technique in cosmological
  results from Type Ia supernovae
• Spectroscopic confirmation of high redshift
  supernovae from the ESO-VLT
• Wavelet analysis of SN Ia spectra
• CMAGIC with B vs B-I and B vs B-R

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SN Ia from different host types
Sullivan et al. 2003
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Knop et al. (2003)
Light Curves of the 11 SNe Observed with the HST
I
R
R
I
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Knop et al. 2003
HST observations of 11 SNe
91T-like, omitted
No Extinction correction
With Extinction Correction
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Another major result
Color MAGnitude Intercept Calibrations of SN Ia
(CMAGIC)
Wang, Goldhaber, Aldering, Perlmutter ApJ, 590,
944 (2003)
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A comprehensive study of nearby well observed SNe
?????????mag
CMAGIC
Mag. At Max
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Nearby campaign in 1999 as a pre-cursor to SN
Factory
SCP 1999 low redshift search
SN Factory will do both much better
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Nearby Supernova Factory
LBNL G. Aldering (P.I.), C. Day, B. Lee, S.
Loken, P. E. Nugent, S. Perlmutter, J. L.
Siegrist, L. Wang, M. Wood-Vasey Other
Collaborators at LPNHE (Laboratoire de Physique
Nucleaire et de Haute Energies de Paris) CRAL
(Center de Recherche Astronomique de Lyon) IPNL
(Institude de Physique Nucleaire de
Lyon) University of Chicago -Center for
cosmological physics

• Large nearby SN Ia sample needed
• Dramatic statistical improvement of w estimate
• Anchor zero-point of the Hubble diagram
• Improve understandings of SN Ia as standard
  candles
• More accurate K-corrections
• Precise determinations of host galaxy dust
  properties
• Detailed study of SN Ia intrinsic properties

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Project Overview

• Search
• Images from two 1.2 m telescopes operated by Near
  Earth Asteroid Team
• Data are transferred to LBNL and processed using
  NERSC PDSF cluster
• Pilot search began in the fall of
  2002 and continued through April 2003 when the 3
• square degree camera was replaced
  with a 9 square degree field of view camera
• Follow up at Hawaii 2.2 meter telescopeSNIFS
• Simultaneous spectrophotometric coverage of
  both the SN and the host galaxy
• using the SuperNova Integral Field
  Spectrograph (SNIFS).

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SN Factory Schedule Summer 1999 Project
inception Spring 2001 SNIFS
construction begins Fall 2002
Search pipeline running Feb. 2003
French laboratory director's project
review Jun. 2003 Software
review in Lyon, France Spring 2004 SN
Factory operation begins Spring 2007
SN discovering stage completed Spring 2008
Observing operations completed Spring 2009
Data analysis operations completed
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SN Factory is running
Best first year results for any SN search
group 83 SNe found in pilot searches of 2002/2003
(6 months)

New Camera has 3X field of view, 2X sensitivity
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SNIFS Spectrograph
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Mounting the imager CCD
SNIFS will be shipped next month
The blue cameras
The imager camera
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Scientific results
SN 2002ic - A milestone in understanding SN Ia
Hamuy et al. 2003
Wood-Vasey et al. 2003
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Common Supporting Studies

• New light curve fitting tools for SN Ia
• Better spectral classification tools
• K-correction tools
• Spectropolarimetry studies of supernova shapes

G. Aldering, G. Goldhaber, D. E. Groom, A.G. Kim,
G. Lynch, D. Madgwick, S. Perlmutter, N. A. Roe,
J. L. Siegrist, A. L. Spadafora, M. W. Strovink,
R. Thomas, L. Wang
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Light curve tools multi-color stretch method
A new light curve fitting method
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Better spectroscopic tools
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Shapes of SN Ia - spectropolarimetry studies
The detection of polarization strengthen the use
of SN Ia as standard candles
Wang et al. 2003
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Conclusions

• Supernova Cosmology Project
• Successful observing campaigns
• Discoveries of 29 high redshift SNe with Subaru
• HST ACS follow ups of 5 SNe
• Beginning of CFHT/SNLS survey
• HST campaign that will add to the Subaru results

• Analysis of 11 high quality HST SNe
• Direct estimate of dust extinction of high
  redshift SNe
• Improved confidence contours of ??
• Best measurement of w

• CMAGIC
• A novel approach for dust extinction estimates
• Smaller statistical dispersion

• Supernova Factory
• SN Search has already discovered 83 SNe in 6
  months
• Follow up instrument SNIFS is ready to ship
• SN factory will be in full operation in Spring
  2004

• Common supporting studies
• Comprehensive effort on classifications and
  quantifications of SN Ia