1. KDUST Supernova Cosmology
Lifan Wang
CCAA

2. Key Problems Absolute photometric precision to 1%?
Relative photometric precision to ???
K-correction
Extinction
Intrinsic evolution
Nearby Cepheid calibration

3. Survey Field SDSS calibration – is it good enough? SPT field
DES calibration – need to communicate with DES on their calibration precision and wavelength
LSST overlap
IR photometry to 1%? How?

4. Survey Cadence
LSST simulation pipeline
Deep field?
Shallow field?

5. New Sciences with SNIa Strong lensing, Hubble constant
Weak lensing of SNIa
Mass sheet degeneracy
Dark matter halo around clusters
Dark matter halo around galaxies
Metallicity evolution
Star formation

6. Pre-KDUST AST3+KPT KDUST
About 1000 Nearby SN with nightly spectroscopy
KDUST
Narrow field - Over a 10 sq degrees of complete SN mapping
Wide field – Over 100 square degrees of less dense coverage

7. For Mission Updates http://aag.bao.ac.cn/ - updates at NAOC
latest on KDUST

8. The Collaborating Institutes
The project will be coordinated by CCAA, whose member institutes include: PMO, NAOC, NIAOT, IHEP, PRIC, and more …
International partners interested in the project: LBNL, Texas A&M University, Johns Hopkins University, and JPL.

9. Project Goals Engineering pathfinder to cope with technical challenges
Site verification telescope to derive important data on seeing, sky background, and the overall stability of the site
Forefront astronomical study in dark energy, dark matter, black holes, stellar structures, and extrasolar planets

10. Basic Characteristics
1 meter aperture
Fully steerable, with pointing accuracy to within one arc second
Routine high quality imaging at seeing of ~0.3 arc seconds
Optical spectroscopy
Near infrared imaging from nm.

11. Project Schedule Conceptional Design 2009-2011
Telescope construction
Integration and testing
First light at Dome A

12. Technical and Scientific Projects
Telescope: built by NIAOT
First generation instruments: IFU and NIR Camera
Second generation instruments: PI instruments
PI sciences

13. PI Instruments and PI Sciences
Supernova Cosmology
Asteroseismology
Extrasolar Planets
Black holes
Time domain astronomy – GRBs, supernovae, novae, etc.
Strong lensing
The PIs will be in charge of successful execution of relevant science projects.
CCAA will form review panels to evaluate the feasibility of PI instruments and related science projects.

14. Supernova Cosmology
Observations of 800 Type Ia supernovae at red shift between
There are less than 100 well observed SNIa today, most of them with poor spectral coverage
KPT will improve the situation by at least a factor of 10. This paves the road for future dark energy programs such as JDEM, LSST, and KDUST
KPT is the necessary first step in building up the distance ladder for cosmological probes

15. AST3
Kim et al. 2010

16. AST3
Kim et al. 2010

17. AST3
Kim et al. 2010

18. KPT-IFU
Kim et al. 2010

19. KPT-IFU
Kim et al. 2010

20. KPT-SLITLESS
Kim et al. 2010

21. KPT-SLITLESS
Kim et al. 2010

22. KPT-NIRCAM
Kim et al. 2010

23. KDUST Dense field Porous field Dark energy constraints
Rates of various events
Observational simulation – cadence etc
Porous field
What’s for?
Dark energy constraints
Dark matter constraints

24. KDUST Over 10,000 SNIa a day Many many more SNII, SNIbc, … Orphan GRBs
Exposure time calculator:
More updates in the future:

25. KDUST(8m)
Multiply the exposure time by a factor of 4 to get the exposure time for a 4 meter KDUST
Kim et al. 2010

26. KDUST(8m)
Kim et al. 2010

29. Summary
1. A self-contained search and survey over five years can yield a spectrophotometric time series of 1000 z < 0.08 supernovae. 2. These can serve to anchor the Hubble diagram and quantify the relationship between luminosities and heterogeneities within the Type Ia supernova class,reducing systematics. 3. Larger aperture (&4-m) telescopes are capable of discovering supernovae shortly after explosion out to z~3. 4. These can be fed to space telescopes, and can isolate systematics and extend the redshift range over which we measure the expansion history of the universe.
Kim et al. 2010