Science Update: SN2011fe in M101 (Pinwheel Galaxy)
Peter Nugent (LBNL/UCB)
Major Points
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The integrated role of all 3 agencies in the discovery and follow-up of SN 2011fe.
The level of computing required to deliver such discoveries.
PTF (2009-2013)
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92 Mpixels, 1” resolution, 2.0” seeing, R/g=21 in 60s
2 cadences SN & Dynamic with g in dark time & R in bright time
PTF Science
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PTF Key Projects
Various SNe
Dwarf novae
Transients in nearby galaxies
Core collapse SNe
RR Lyrae
Solar system objects
CVs
AGN
AM CVn
Blazars
Galactic dynamics
LIGO & Neutrino transients
Flare stars
Hostless transients
Nearby star kinematics
Orphan GRB afterglows
Type Ia Supernovae
Eclipsing stars and planets
Tidal events
H-alpha ½ sky survey
The power of PTF resides in its diverse science goals
and follow-up.
PTF Pipeline
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128 MB/90s
50 GB/night
Real-time Pipeline
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NERSC GLOBAL FILESYSTEM
240TB
Data
Transfer
Nodes
Science
Gateway
Node 2
Science
Gateway
Node 1
Observatory
PTF
Collaboration
via Web
Processing/db
Carver
3200
core IBM
Subtractions
~1 hour turnaround
PTF: Real or Bogus
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PTF produces 1 million candidates during a typical night:
Most of these are not real
Image Artifacts
Misalignment of images due to poor sky conditions
Image saturation from bright stars
50k are asteroids
1-2k are variable stars
100 supernovae
1-2 new, young supernovae or other explosions
Help from Bloom et al. NSF-CDI project:
Real-time Classification of Massive Time-series Data Streams
Real or Bogus
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moon
4096 X 2048 CCD images - over 3000 per night
Real or Bogus
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230 bogus candidates, 2 variable stars, 4 asteroids and the youngest Type Ia supernovae observed to date….
PTF10ygu: Caught
2 days after explosion
Citizen Scientists…
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http:// supernova.galaxyzoo.org keeps chugging along (Smith et al., 2010)
Typically we have them scan ~200 candidates in 12 hrs after the night is finished. They get the list of the top 100 real-bogus, top 100 S/N, and top 100 via host-size of all new candidates.
SN 2011fe was caught within 11 hrs +/- 20 min. of explosion.
First spectra
~24 hr later.
Peaked @ mag 9.9, making it the 5th brightest SN in last 100 years.
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Peter Nugent
SYNAPPS spectrum synthesis fits on NERSC’s Hopper commenced 1 hour after first spectrum was reduced.
Finished analysis 30 hours after SN was first detected!
Ca II
Si II
S II
Mg II
Fe II
O I
Ca II
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Peter Nugent
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Peter Nugent
Rules out red giant companions and a lot of double degenerate models.
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Peter Nugent
HST Pre-imaging of the field where SN 2011fe was found.
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Peter Nugent
Constraints on the progenitor system.
Basically all we can have are a double degenerate system or a low mass main sequence companion.
Nature: Nugent et al. and Li et al.
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Peter Nugent
DOE/HEP: NERSC computing facilities, SCIentific Discovery through Advanced Computing program and staff and scientific leadership in the SN Ia experiment for PTF.
NSF: Direct support of PTF and support from the Cyber Enabled Discovery and Innovation Program - real-time classification.
NASA: Swift, Chandra and HST for both pre-explosion imaging (optical and x-ray) and follow-up after discovery in the ultra-violet.