1. Hunting youngest Type Ia SNe 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 SNe Ia library – Looking for peculiar Type Ia SNe Conclusion 9/24/13 LeidenYi Cao1

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. 9/24/13 LeidenYi Cao2

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 9/24/13 LeidenYi Cao3

5. Young Type Ia SN physics Distribution of 56 Ni Unburned material Interaction with companion (Piro & Nakar 2013) (Kasen 2010) 9/24/13 LeidenYi Cao4

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 9/24/13 LeidenYi Cao5

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 9/24/13 LeidenYi Cao6

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 9/24/13 LeidenYi Cao7

9. Goals Peculiar SNe Ia 9/24/13 LeidenYi Cao8

10. (Cao et al. in prep.) 9/24/13 LeidenYi Cao9

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 Ia SNe. Peculiarity of SNe Ia 9/24/13 LeidenYi Cao10