Recent Studies on Type Ia Supernovae



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Science Update: SN2011fe in M101 (Pinwheel Galaxy)

  • Peter Nugent (LBNL/UCB)

Major Points

  • AAAC Meeting
  • 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)

  • AAAC Meeting
  • 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

  • AAAC Meeting
  • PTF Key Projects
  • Various SNe
  • Dwarf novae
  • Transients in nearby galaxies
  • Core collapse SNe
  • RR Lyrae
  • CVs
  • AGN
  • AM CVn
  • Blazars
  • Galactic dynamics
  • LIGO & Neutrino transients
  • Flare stars
  • Hostless transients
  • Nearby star kinematics
  • Orphan GRB afterglows
  • Type Ia Supernovae
  • Tidal events
  • H-alpha ½ sky survey
  • The power of PTF resides in its diverse science goals
  • and follow-up.

PTF Pipeline

  • AAAC Meeting
  • 128 MB/90s
  • 50 GB/night

Real-time Pipeline

  • AAAC Meeting
  • 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

  • AAAC Meeting
  • PTF produces 1 million candidates during a typical night:
    • Most of these are not real
    • 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

  • AAAC Meeting
  • moon
  • 4096 X 2048 CCD images - over 3000 per night

Real or Bogus

  • AAAC Meeting
  • 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…

  • AAAC Meeting
  • 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

PTF Sky Coverage

  • AAAC Meeting
  • 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.

SN 2011fe (PTF11kly)

  • AAAC Meeting
  • Peter Nugent
  • 180k views on YouTube, 50+ newspaper articles, PBS Newshour, BBC, NPR…
  • AAAC Meeting
  • Peter Nugent
  • 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.
  • AAAC Meeting
  • 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
  • AAAC Meeting
  • Peter Nugent
  • AAAC Meeting
  • Peter Nugent
  • Rules out red giant companions and a lot of double degenerate models.
  • AAAC Meeting
  • Peter Nugent
  • HST Pre-imaging of the field where SN 2011fe was found.
  • AAAC Meeting
  • 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.
  • AAAC Meeting
  • 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.
  • Agencies

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