STARE Operations Experience and its Data Quality Control IAC Roi Alonso Hans Deeg Juan A. Belmonte...
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Transcript of STARE Operations Experience and its Data Quality Control IAC Roi Alonso Hans Deeg Juan A. Belmonte...
![Page 1: STARE Operations Experience and its Data Quality Control IAC Roi Alonso Hans Deeg Juan A. Belmonte HAO Boulder Tim Brown David Charbonneau.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d195503460f949eed2b/html5/thumbnails/1.jpg)
STARE Operations Experience and its Data Quality Control
IAC
Roi Alonso
Hans Deeg
Juan A. Belmonte
HAO BoulderTim Brown
David Charbonneau
![Page 2: STARE Operations Experience and its Data Quality Control IAC Roi Alonso Hans Deeg Juan A. Belmonte HAO Boulder Tim Brown David Charbonneau.](https://reader035.fdocuments.net/reader035/viewer/2022062714/56649d195503460f949eed2b/html5/thumbnails/2.jpg)
STARE Operations Experience and its Data Quality Control
Potsdam, July04 #2
STARE telescope• Stellar Astrophysics and Research on Exoplanets.• HAO, NASA funding; IAC logistics and personnel.• Detection of first planet transit in 1999, during commision at
HAO• Located at Teide Observatory, Tenerife since July 2001• Schmidt optics, 10.1 cm Ø,
f=286mm. • CCD: 2k x 2k Loral, 15m pix• 6.1x6.1 deg2 FOV, 10.8 arcsec/pix • R, V, B manual filters.
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #3
Transit Detection Observations
STARE observation strategy:• One (two) field observed all night, typ. declination 30°-40°.• Observation of a field for 2 - 3 months ( 150-400 hrs)• R band exposures of 100 sec, 13 sec readout• typical field: few 1000 stars rms < 1%
Requirements :
•precision F/F better than 0.5%
•observational coverage O(103-4) hrs
•data points every few minutes
•surveying thousands of stars
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #4
In collaboration with similar projects
• PSST: Lowell Obsv., Arizona. T. Dunham, G. Mandushev
• SLEUTH: Mt. Palomar, California. D. Charbonneau, F. O’Donovan
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #5
Instrument control
• Hardware: 2 PCs: {Dome, Mount},{CCD,guiding}• Optical fiber interfaces computers telescope dome• Control software
– Unified user interface withVisual C++ (Windows98)
– Telescope: Orchestrate Scripting Software (Software Bisque):
– Dome: AutomaDome (Software Bisque):
– CCD: Pixel View (Pixel Vision)
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #6DLT, DVD
Operations schemeoperator opens dome, starts scriptAfternoon
Nightfall; if fieldhigh enough
End of night/fieldtoo low
Morning
script starts observations
PC butch (script) PC sundance
Mount+dome CCD+autoguide
script return telesc. to home pos
operator closes dome, saves data (2Gb/night)
Observingperiod
operator watchesweather;
closes if needed
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #7
Data reduction schemeraw data saved on DLT, now DVDTeide Obsv
IDL programs: quality control, image processing, photometry, classification, transit search
IAC, La Laguna
PSST Lowell, Sleuth Palomar
Confirmation of events in other’s data.
Combination of data from 3 sites and transit search in combined data
Future
HAO, BoulderCoordination of follow-up obsv.
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #8
STARE statusField
Observing
dateObserving
nights (Teide)Stars with
rms<1%
Observing time (h) (Teide)
Coll. Telesc.
Status
Jul-Oct 01 38 of 91 ~7300 195 1 Reduced
Boo1 Abr-Jul 02 39 of 118 ~1500 238 2 Reduced Teide and
Lowell
Cyg1 Jul-Oct 02 16 of 78 ~7300 67 2 Reduced Teide
Per2 Oct-Nov 02 30 of 58 ~6300 193 2 Reduced Teide
Cnc0 Feb-May 03 16 of 89 ? 127 2 Reduced Reduced Lowell
Her0 May-Jun 03 44 of 54 ~1600 291 3 Reduced All
Lyr0 Jul-Sep 03 ~50 of 68 ? 367 3 Red. Teide Lowell
Cyg0
42 And Sep03-Jan04 56 of 121 ~3000 397 3 Not reduced
27 Lyn Jan-Mar04 29 of 61 ? 103 3 Not reduced
Since March: Technical problems (110V supply, UPS)
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Instrumental & atmospheric sources of false alarms
Sources : instrumental:•guiding errors (moving psf over zones with varying flat-field correct.)•temperature/focus variations
Sources : atmospheric:•unrecognized extinction variations (cirrus, dust)•simple high-sigma events in photon noise (star, sky), scintillation
“Transits are rare events in hugh data sets which compete with other rare events to become detected”
False alarm: any event that appears to be a transit, but isn’t
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #10
Astron. source of false alarms(Brown 2003)
Confusion from:• grazing eclisping binaries
• diluted eclising binaries (by foreground star)
• diluted eclising binaries (triple sys)
• Planetary transits
We look for:
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #12
Data quality control Photometric, moon rise
extinction sky bright.
guiding alignment
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #13
Data quality control Cirrus in early night
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #14
Data quality control Dusty night
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #15
Data quality control guiding unstable, moon setting
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #17
Follow-up tecniques for transit candidates
• Careful interpretation of the lightcurve:– non-transit-like shape, search for primary/secondary eclipses– verify that transit is compatible with planet (Seager & Mallén-Ornelas, 2003)
• Multicolor transit photometry (incidentially with higher spatial resolution)– detects many cases of Ecl. binaries.
• Imaging with very high resolution (adapt. optics)– indicates if there are nearby stars, potentially Ecl. Binaries
• Radial velocity measures– low res: may detect Ecl. binaries (false alarm rejection)
– high res: independent verification of planet
Reject astronomical sources of false alarms by a sequence of tests, from simple (light) to sophisticated (resource-intensive) ones:
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STARE Operations Experience and its Data Quality Control
Potsdam, July04 #27
Summary and future• Routine transit search operation since 2001
• Operations will continue for at least 3 years
• Well-coordinated collaboration is in place for follow-up observations. Sequence of methods to reject false alarms.
• Some interesting planet candidates which need final verifications.