Upload
lacy
View
41
Download
0
Tags:
Embed Size (px)
DESCRIPTION
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 - PowerPoint PPT Presentation
Citation preview
Hunting youngest Type Ia SNe in the intermediate Palomar Transient Factory
Yi Cao (Caltech)On behalf of
the intermediate Palomar Transient Factory collaboration
Yi Cao 2
Outline
• Motivation
• the intermediate Palomar Transient Factory– Building young SNe Ia library– Looking for peculiar Type Ia SNe
• Conclusion
9/24/13 Leiden
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.
9/24/13 Leiden
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
9/24/13 Leiden
Yi Cao 5
Young Type Ia SN physics
• Distribution of 56Ni• Unburned material• Interaction with companion
(Piro & Nakar 2013) (Kasen 2010)9/24/13 Leiden
Yi Cao 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 Leiden
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
9/24/13 Leiden
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 submittedWe also triggered our LCOGT program for optical photometric follow-up and informed friends to get IR data with RATIR
9/24/13 Leiden
Yi Cao 9
Goals
• Peculiar SNe Ia
9/24/13 Leiden
Yi Cao 10(Cao et al. in prep.)9/24/13 Leiden
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 Ia SNe.
• Peculiarity of SNe Ia
9/24/13 Leiden