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Robert P. Kirshner, Peter Challis, Tom Matheson, Malcom Hicken (CfA)
Saurabh Jha (UC Berkeley)
Peter Garnavich (Notre Dame)
Supernovae at the CfA Current Samples and Applications
Spectroscopy at Mount Hopkins
FLWO 1.5-m Tillinghast reflector
FAST spectrograph
●3700–7500Å
●Recent upgrade to optics
Three or four spectra per night, ~300 spectra per year
Reliable service observers on site
Classification of Supernovae
560 nearby (low-z) SNe discoveredin last three years
495 have spectroscopic classifications
Mt. Hopkins program responsible for 195 (39%!)
Spectra available on CfA web page
Email alerts to immediately disseminate information
http://cfa-www.harvard.edu/cfa/oir/Research/supernova/RecentSN.html
Spectroscopic Database
● 387 Type Ia Spectra for SNe with calibrated light curves
● Epoch of spectra ranges from –14 days to several months past maximum
● 201 spectra from day –14 to day +14
● Δm15
range 0.85 ― 1.93
● All galaxy types
● Once photometry complete, spectroscopic sample will double
● All spectra from same instrument/telescope combination
● All spectra reduced in same manner
● Systematics for comparison are reduced
Photometry at Mount Hopkins
FLWO 1.2-m reflector
4shooter camera
11' X 11' per chip
One SN per night in UBVRI
One night per dark run for photometric calibration, templates,etc.
Service observing during scheduled programs
IR Photometry at Mt. Hopkins
FLWO 1.2-m Reflector with Stelircam
One SN per night in JHK
Service observing during scheduled programs
Jha et al. 1999
2Mass Camera and Telescope coming soon: Josh Bloom
Hubble-Flow SNe Ia80 SNe Ia with cz ≥ 2500 km/s in CMB frame
one parameter fit: aV = log cz - 0.2mV0
aV = 0.6838 ± 0.0045 (random) ± 0.0120 (systematic)
Cepheid-Calibrated SNe Ia80 SNe Ia with cz ≥ 2500 km/s in CMB frame
same supernova data! same Cepheid data!
Claudio Aguilera --- CTIO/NOAO
Brian Barris --- Univ of Hawaii
Andy Becker --- Bell Labs/Univ. of Washington
Peter Challis --- Harvard-Smithsonian CfA
Ryan Chornock --- UC Berkeley
Alejandro Clocchiatti --- Univ Catolica de Chile
Ricardo Covarrubias --- Univ of Washington
Alex V. Filippenko --- UC Berkeley
Peter M. Garnavich --- Notre Dame University
Malcom Hicken--Harvard-Smithsonian CfA
Stephen Holland --- Notre Dame University
Saurabh Jha --- UC Berkeley
Robert Kirshner --- Harvard-Smithsonian CfA
Kevin Krisciunas --- CTIO/NOAO
Bruno Leibundgut --- European Southern Observatory
Weidong D. Li --- UC Berkeley
Thomas Matheson --- Harvard-Smithsonian CfA
Anthony Miceli --- Univ of Washington
Gajus Miknaitis --- Univ of Washington
Armin Rest --- Univ of Washington/CTIO
Adam G. Riess --- Space Telescope Science Institute
Brian P. Schmidt --- Mt. Stromlo Siding Springs Observatories
Chris Smith --- CTIO/NOAO
Jesper Sollerman --- Stockholm Observatory
Jason Spyromilio --- European Southern Observatory
Christopher Stubbs --- Harvard-Smithsonian CfA
Nicholas B. Suntzeff --- CTIO/NOAO
John L. Tonry --- Univ of Hawaii
ESSENCE Survey Team
ESSENCEEquation of State: SupErNovae Trace Cosmic
Expansion
● NOAO Survey on CTIO 4m, MOSAIC for 5 years
● Shares frame subtraction pipeline with SuperMacho project, scheduled in “other” halves of SuperMacho nights
● Expect ~ 200 supernovae with 0.1 < z < 0.8
● 3 band photometry: V,R,I (observer frame)
● 2 sets of fields, so t=4 days
● Goal is to determine the distance to each redshift bin (z = 0.1) to 2%
● ~3% photometry at peak SN brightness
Supernovae, CMB, and large scale structurewill determine w to 10%
This cannot fail to be interesting! or something else.
The GOODs ACS Treasury Program &
The Higher-Z Supernova Search Team
Sees farther than others:1.2< z < 1.8supernovae
Riess (STScI)Strolger (STScI)Tonry (UH)Filippenko (UCB)Kirshner (CfA)Challis (CfA)Casertano, (STScI)Dickinson (STScI)Giavalisco (STScI)Ferguson (STScI)
Adam Riess
Our first higher-z SN Ia, Aphrodite
Aphrodite (1<z<1.5)
ACS grism spectrum
NICMOS F110W
ACS F850lp
viz