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Hunting youngest Type Ia SNe in the intermediate Palomar Transient Factory

Hunting youngest Type Ia SNe in the intermediate Palomar Transient Factory. Yi Cao (Caltech) On behalf of the intermediate Palomar Transient Factory collaboration. Outline. Motivation the intermediate Palomar Transient Factory Building young SNe Ia library

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Hunting youngest Type Ia SNe in the intermediate Palomar Transient Factory

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  1. Hunting youngest Type IaSNe in the intermediate Palomar Transient Factory Yi Cao (Caltech) On behalf of the intermediate Palomar Transient Factory collaboration

  2. Outline • Motivation • the intermediate Palomar Transient Factory • Building young SNeIalibrary • Looking for peculiar Type IaSNe • Conclusion Yi Cao

  3. PTF summary • Discovery machine: Palomar 48-inch telescope • Exposure time: 60 sec • Depth: R~21.0, g~21.5 • FoV: 7.2 sq. deg. Yi Cao

  4. Summary of PTF • 2009 – 2012 • Survey cadence: 3-day, 5-day, 1-day (very limited time) • Have spectroscopically classified 1818 SNe • 2/3 are Ia’s • Redshift distribution Yi Cao

  5. Young Type Ia SN physics • Distribution of 56Ni • Unburned material • Interaction with companion (Piro & Nakar 2013) Yi Cao (Kasen 2010)

  6. iPTF • Cadence: 3 epochs per night, separated by 45 min • Survey area: 400 – 700 sq. deg., selected to maximize event rates in nearby galaxies • Depth: R~21 (single epoch), R~21.5 (nightly stacking) • Real-time process turnaround time: <= 30min • Machine-learning classifier • Alert system for “best” optical transient candidates Yi Cao

  7. Goals • Building young Ia library • Automated same-night photometry follow-up with Palomar 60-inch telescope in Bgriz bands • (coming soon) automated same-night spectroscopic classification: SEDM • Extensive optical follow-up with resources all over the world • Follow-up in other energy bands: X-ray/UV, IR, submm, radio Yi Cao

  8. What is happening in iPTF • iPTF13dge (Sept 4, 2013) • [04:05:42]: first P48 epoch • [04:56:31]: first candidate loaded into our DB • [04:59:50]: second P48 epoch • [05:50:08]: second candidate loaded into our DB • [05:51:09]: automated saved • [07:24:31]: LRIS spectrum -> Ia at -15 days • [09:54:07]: Swift started to observe • [15:00:00]: CARMA triggered, VLA DDT proposal submitted We also triggered our LCOGT program for optical photometric follow-up and informed friends to get IR data with RATIR Yi Cao

  9. Goals • Peculiar SNeIa Yi Cao

  10. (Cao et al. in prep.) Yi Cao

  11. To sum up • iPTF has demonstrated its ability of rapid response to discover and follow up youngest SNe • In the next two years, iPTF will build a comprehensive light curve and spectrum library of very young Type IaSNe. • Peculiarity of SNeIa Yi Cao

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