Transcript Document

The Carnegie Supernova
Program
Zwicky Symposium Saturday,
January 17, 2004
Carnegie Observatories
Type Ia Supernovae for
Cosmology
Advantages:
• small dispersion
• single objects (simpler than galaxies)
• can be observed over wide z range
Challenges:
• dust (grey dust)
• chemical composition
• evolution
• photometric calibration
• environmental differences
Carnegie Supernova Project
• Infrared observations of Type Ia & II supernovae
• High and low z (0 < z < 0.8)
• I-band Hubble diagram : improved constraints on w
CSP coI’s:
Gaston Folatelli
Wendy Freedman
Mario Hamuy
Barry Madore
Nidia Morell
Eric Persson
Mark Phillips
Nick Suntzeff
Pamela Wyatt
Ray Carlberg (CFHT Legacy)
Alex Filippenko, Weidong Li (KAIT)
Nick Suntzeff (ESSENCE)
Carnegie Supernova Project
Why an I-band Hubble diagram?
• Advantages:
- dust
- chemical composition
- low dispersion
=> reduce systematics
Barris et al. (2003)
unbinned
binned (median)
Overview of Carnegie Supernova Project
Low z:
Swope 1-meter (C40)
u’BVr’i’ CCD photometry
•YJH IR array
•RAPID SWITCHING (< 15min)
•C40 9 month campaigns over 5 years
• densely sampled (every 2nd night) photometry
• SNIa and SNII
Overview of Carnegie Supernova Project
Dupont 2.5-meter
•u’BVr’i’ CCD photometry
•YJH IR array
•spectroscopy
• densely sampled photometry
and spectroscopy 0 < z < 0.2
• well-determined k-corrections
• SNIa and SNII
Overview of Carnegie Supernova Project
High z:
Magellan 6.5-meter
• RIYJ
photometry
• Magellan spectroscopy
• ~200 nights over 5 years
• ~200 SNIa
• 0.2 < z < 0.8
Overview of Carnegie Supernova Project
Swope 1-meter (C40)
Low z:
Dupont 2.5-meter
Magellan 6.5-meter
High z:
•u’BVr’I’YJH photometry
• Dupont spectroscopy
• r’i’YJ photometry
• Magellan spectroscopy
• C40 9 month campaigns
over 5 years
• densely sampled photometry
and spectroscopy 0 < z < 0.2
• SNIa and SNII
• ~200 nights over 5 years
• ~200 SNIa
• 0.2 < z < 0.8
Carnegie Supernova Project
Goals:
• minimize systematics
• accurate reddenings,
K-corrections
• H0 (H-band observations
for Cepheids + SNIa)
• WL
• peculiar flows
• physics of SNI and II
Magellan
Carnegie Supernova Project
Nearby supernovae:
• ~30 observed to date
• UBVRIJHK light curves
• excellent sampling
Krisciunas et al. (2002)
SN2001el
Carnegie Supernova Project
• decline rate versus magnitude
• BVIH
• H-band promising as
distance indicator
Mark Phillips et al.
Carnegie Supernova Project
Log velocity (km/sec)
H-band Hubble diagram
Distance Modulus (mag)
Krisciunas et al.
Ongoing Supernova Searches
High z:
CFHT Legacy Survey :
• ugriz light curves
• CFHT MegaCam
• 2000 SN over 5 years
• 0.1 < z < 1
ESSENCE :
• VRI light curves
• CTIO 4m Mosaic Imager
• 200 SN over 5 years
• 0.15 < z < 0.75
Low z:
LOTOSS (KAIT) :
•UBVRI light curves
• Lick
• 0 < z < ~0.15
SN Factory:
• spectophotometry, UH
• 3200 – 10000 Ao
• NEAT, Palomar
•***E.g., redshifts posted on web within 2 days!!!!!
CFHT Legacy Survey : Success!
CFHT Legacy candidates: September 03
• finding ~ 15 SN1a
per month
• generally finding
~ 2 mag before
peak
• collaboration with
Carlberg et al.
• followup SN1a
0.2 < z < 0.8
at RIYJ
CFHT Legacy Survey : Success!
CFHT Legacy candidates: September 03
REFERENCE
DIFFERENCE
• Try to catch supernovae on
the rise for followup.
• IAB ~ 22 – 25 mag
Followup Spectroscopy: ESSENCE & CFHTLS
•VLT
•Gemini
•Magellan
e.g.:
SNIa
• SN Ia spectrum
• z = 0.54
• t = 20 min
• VLT FORSI
PANIC: Magellan 6.5-meter IR Imager
Antennae
• 1024 x 1024 array
• 1 – 2.5 micron imager
• 2’ x 2’ FOV
• 0.125 “/pixel
PANIC: Eric Persson
PANIC: Magellan IR Imager
• 35 nights of
Magellan time
• November 03
through March 04
• optical r’I’ imaging
• near-IR YJ imaging
• optical spectroscopy
IMACS: Inamori Magellan Areal
Camera and Spectrograph
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Alan Dressler, Bruce Bigelow
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2 cameras
f/4 : 15’ FOV
f/2 : 30’ FOV
8192 x 8192 CCD array
installed August, 2003
Followup spectroscopy
RI photometry
Magellan SNIa Observations
z
0.20
0.30
0.30
0.55
0.69
ID
e132.wcc1_7
d149.wcc4_11
e108.wdd8_4
c031022-02
c031217_23
I-mag
Discovery
21.3
19.5
21.8
23.0
23.9
Essence
Essence
Essence
Legacy
Legacy
First Magellan PANIC Images
November 3, 2003
J-band
Y-band
ESSENCE SNIa : z = 0.33 (d149) 36-minute dithered exposures
First Magellan PANIC Images
November 3, 2003
J-band
CFHT SNIa : z = 0.55 (1022) 36-minute dithered exposures
(total exposures 2 hours per filter)
Y-band
Stay tuned…