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

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Presentation transcript:

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 – Looking for peculiar Type Ia SNe Conclusion 9/24/13 LeidenYi Cao1

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

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

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

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

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

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

Goals Peculiar SNe Ia 9/24/13 LeidenYi Cao8

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

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