1 Fermilab: J. Adelman-McCarthy, F. DeJongh, G. Miknaitis, H. Lin, J. Marriner, C. Stoughton, D. Tucker, D. Lamenti (SF State) U. Chicago: B. Dilday, R.

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Presentation transcript:

1 Fermilab: J. Adelman-McCarthy, F. DeJongh, G. Miknaitis, H. Lin, J. Marriner, C. Stoughton, D. Tucker, D. Lamenti (SF State) U. Chicago: B. Dilday, R. Kessler, D. Cinabro (Wayne State), M. SubbaRao U. Washington: A. Becker, C. Hogan, Z. Ivezic JINA: P. Garnavich Portsmouth: R. Nichol, M. Smith NMSU: J. Holtzman, T. Gueth APO: J. Barentine, H. Brewington, J. Dembicky, M. Harvanek, J. Krzesinski, B. Ketzeback, D. Long, O. & V. Malanushenko, R. McMillan, K. Pan, S. Snedden JPG: M. Doi, N. Yasuda, N. Takanashi, K. Konishi, K. Tokita Stanford: R. Romani, M. Sako, C. Zheng, R. Blandford, S. Kahn, J. Kaplan, S. Jha Ohio State: D. DePoy, J. L. Prieto, J. Marshall JHU/STScI: A. Riess, H. Lampeitl Penn State: D. Schneider External Collaborators: M. Richmond (RIT), E. Elson (SAAO), B. Bassett (SAAO), K. van den Heyden (SAAO), L. Wang (LBL), R. Foley (UCB), A. Filippenko (UCB) Additional collaborators on spectroscopic follow-up graduate student undergraduate SDSS II SN Development/Operations J. Frieman

Science Goals: Fill in `redshift desert w/ ~200 well-measured lightcurves at z~ Probe Dark Energy in z regime complementary to deeper surveys Study SN Ia systematics with excellent SDSS photometry Determine SN rates/properties Rest-frame u-band templates for z >1 surveys Database of Type II and rare SN light-curves (large survey volume) Method: Repeat imaging of stripe 82, Sept-Nov. alternate 82N and 82S On-mountain frame subtraction Follow-up spectroscopy (& imaging) elsewhere SDSS Astier etal 05

3 Development Highlights: Frame subtraction: improved diagnostics, remapping, masked pixels, PSF determination (from PHOTO), convolution, object finding; use co-added template images, added i band Database: improved veto & star catalogs `real-time efficiency tests with artificial SNe in data stream Multi-color SN target selection using multi-band light curve fitting with and without host photo-z or spectro-z: pre-typing Web interface for human scanning of SN candidates Public webserver & CBET circulars for confirmed candidates Hardware: 10 dual processors at APO: process gri in ~20 hrs Much more extensive follow-up program More experienced team w/ a few new faces Improvements for 2005 Run (from 2004 Test Run):

4 Scan Example z=0.045 : also followed by SNF and CSP search template difference g r i To appear on scan- page requires the difference image for at least two filters to have S/N >~ 3 and to be within 0.6.

Fall 2005: ~130 spectroscopically confirmed Type Ias 14 spectroscopically likely/possible Ia 11 confirmed SN II 6 confirmed Ib/c ~100s of unconfirmed Ias based on light curves

6 SN 2005 ff z = 0.07, confirmed at WHT Preliminary gri light curve and fit from low-z templates BeforeAfter Composite gri images

7 SN 2005 gb z = 0.086, confirmed at ARC 3.5m Preliminary gri light curve and fit from low-z templates BeforeAfter Composite gri images

Finding Supernovae Before Peak Light: important for good Peak Mag estimate

9 Monte Carlo prediction Confirmed Ias

… at least one opportunity to scan from software … at least one SN tag from human Efficiency Estimate Using Fake SNe Inserted into Data Stream

11 SDSS II SN Follow-up 2005 Spectroscopy: mainly SN typing, redshift NIR imaging: extinction/reddening and low-z light curves Optical imaging: follow high-z light curves beyond SDSS limit Spectroscopy: ARC 3.5m (31 half-nights), HET (~90 hrs), MDM 2.4m (~37 nights), Subaru (share 6 nights), WHT (6 nights), Keck (opportunity, 1 night) ~290 spectra taken NIR imaging: Carnegie Supernova Project (selected targets) Optical imaging: NMSU 1m, MDM, UH 88in (6.5 nights), VATT (7 nights), WIYN (3 nights shared), INT (1 night), Liverpool Telescope (4 hours), CSP low-z

12 Status and Plans First Analyses: Light curve fitting (several methods) + Hubble diagram Individual peculiar SNe (2005hk, 2005gj) SN Ia rate at z< Team meetings: Stanford, Santa Fe, Fermilab,… Aiming for first pubs by Jan AAS Special Session Plans for Fall 2006 Survey: Upgrade search algorithm to reduce human scan load Real time public alert webpage (and VOEvent) Increase multi-epoch, non-Ia, and mid-z follow-up spectroscopy Follow-up spectroscopy scheduled: ARC, MDM, HET, Subaru, NTT (similar amount to 2005)