Science Update: Science Update: SN2011fe in M101 SN2011fe in M101 (Pinwheel Galaxy)(Pinwheel Galaxy)

Peter Nugent (LBNL/UCB)Peter Nugent (LBNL/UCB)

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Major PointsMajor Points

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.

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PTF (2009-2013)PTF (2009-2013)

92 Mpixels, 1” resolution, 2.0” seeing, R/g=21 in 60s2 cadences SN & Dynamic with g in dark time & R in bright time

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PTF SciencePTF SciencePTF Key ProjectsPTF Key Projects

Various SNeVarious SNe Dwarf novaeDwarf novae

Transients in nearby Transients in nearby galaxiesgalaxies

Core collapse SNeCore collapse SNe

RR LyraeRR Lyrae Solar system objectsSolar system objects

CVsCVs AGNAGN

AM CVnAM CVn BlazarsBlazars

Galactic dynamicsGalactic dynamics LIGO & Neutrino LIGO & Neutrino transientstransients

Flare starsFlare stars Hostless transientsHostless transients

Nearby star kinematicsNearby star kinematics Orphan GRB afterglowsOrphan GRB afterglows

Type Ia SupernovaeType Ia Supernovae Eclipsing stars and Eclipsing stars and planetsplanets

Tidal eventsTidal events H-alpha ½ sky surveyH-alpha ½ sky surveyThe power of PTF resides in its diverse science goals and follow-up.

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PTF PipelinePTF Pipeline

128 MB/90s50 GB/night

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Real-time PipelineReal-time Pipeline

NERSC GLOBAL FILESYSTEM240TB

DataTransferNodes

ScienceGatewayNode 2

ScienceGatewayNode 1

Observatory PTF Collaboration

via Web

Processing/db Carver3200

core IBM

Subtractions

~1 hour turnaround

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PTF: Real or BogusPTF: Real or BogusPTF 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

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Real or BogusReal or Bogusm

oon

4096 X 2048 CCD images - over 3000 per night

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Real or BogusReal or Bogus

230 bogus candidates, 2 variable stars, 4 asteroids and the youngest Type Ia supernovae observed to

date….

PTF10ygu: Caught 2 days after explosion

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Citizen Scientists…Citizen Scientists…

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.

PTF11gdm

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PTF Sky CoveragePTF Sky Coverage

1000

100

100

0

To date:• 1301 Spectroscopically typed supernovae• 105 Galactic Transients• 104 Transients in M31• 2.5 years, over 1 million images taken. • 35 refereed publications.

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SN 2011fe (PTF11kly)SN 2011fe (PTF11kly)

180k views on YouTube, 50+ newspaper articles, PBS Newshour, BBC, NPR…

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Swift HST

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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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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Rules out red giant companions and a lot of double degenerate models.

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HST Pre-imaging of the field where SN 2011fe was found.

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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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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.

AgenciesAgencies