exoplanet transit observations at weihai observatory of shandong university chen cao...
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Exoplanet Transit Observations at Exoplanet Transit Observations at Weihai Observatory of Shandong UniversityWeihai Observatory of Shandong University
Chen CAOChen [email protected]
Weihai Observatory of Weihai Observatory of Shandong UniversityShandong University
Longitude: 122°03‘ 02“ ELatitude : 37°32‘ 12“ NAltitude : 110 m-- Observing nights: ~200/yr-- Average seeing: ~1.5”
Optics: classic Cassgerain design, 1000mm1000mm optical working diameter, Primary focal ratio:f/3, system focal ratio: f/8 FOVFOV: ~ 11’
Mount: equatorial fork mount
Maximum loading weight is 100kg at the focus flange
Maximum slew speed is 4 degrees per second in both RA and DEC axis
Pointing: 5.4 arc sec RMS for 20-90 deg altitude
Tracking: 0.54 arc sec RMS in 10 minutes blind guiding
TelescopeTelescope
Made by APM from Germany
• 2K * 2K 13.5m B.L.
• cooling with air ~ -65°
CCCCDD
PIXIS 2048BPIXIS 2048B
ACE Dual filter wheel
Photometry system—Filter system
UBVRIUBVRIuvbyuvby
MotivationMotivation• Goal AGoal A -- -- More Exoplanet transits’ data More Exoplanet transits’ data help to help to
derive higher accuracy planet parameters ; derive higher accuracy planet parameters ; discover the possible “third” object by transit discover the possible “third” object by transit timing. timing.
• Goal BGoal B -- -- Try to detect transits of those known Try to detect transits of those known exoplanets which were discovered by RV method exoplanets which were discovered by RV method but still without transit detections.but still without transit detections.
• Goal CGoal C -- -- Make follow-up photometry Make follow-up photometry observations of the new exoplanet systems observations of the new exoplanet systems discovered by our new high-res spectrograph (will discovered by our new high-res spectrograph (will be installed by the end of this year, by NIAOT).be installed by the end of this year, by NIAOT).
High-res Spectrograph High-res Spectrograph designdesign• R: 38,000~55,000 R: 38,000~55,000
• Operational Wavelength:3,800 Operational Wavelength:3,800 ÅÅ~8,800~8,800ÅÅ
• Wavelength Overlap in Echelle Wavelength Overlap in Echelle orders:3,800orders:3,800ÅÅ~7,700~7,700ÅÅ
• Echelle: Newport spectra physics R2.9 Echelle: Newport spectra physics R2.9
Lei Wang’s talk
Ephemeris – I. xls from AXAEphemeris – I. xls from AXA(for Goal A)(for Goal A)
Ephemeris – II.Ephemeris – II. (transitsearch.org)(transitsearch.org)
(for Goal B)(for Goal B)
ObservationObservationss
Instruments:Instruments:
• 1m1m reflecting telescope (by APM)
• PIPI CCD (PIXIS 2048B, 2K*2K)
Observations:Observations:
• 30 ~ 60 mins30 ~ 60 mins before and after the predicted transit time (if possible)
ObservingObserving
loglog
Total: ~3030 nights
1212 transit events
Data Data ReductionReduction• Data reduction (bias, flat subtraction etc.) with IRAFData reduction (bias, flat subtraction etc.) with IRAF
• Aperture photometryAperture photometry
using using IRAFIRAF & & MaxIM DL (by students)MaxIM DL (by students)
Send the results to:Send the results to: TRESCA TRESCA ProjectProject
http://var2.astro.cz/EN/tresca/transits.php?pozor=Chen%20CAO
TrES-3b (V=12.4, D=27.1mmag)
2009-04-16
2009-05-03
2009-06-10
2009-07-31
TrES-3b
2009-07-31
TrES-1b (V=11.8, D=25.1mmag)
XO-2b (V=11.2, D=14.2mmag)
2008-12-11
2009-04-21
2009-05-04
2009-08-30
WASP-1b (V=11.8, D=14.6mmag)
2009-08-30
WASP-2b (V=12.0, D=19.5mmag)
2009-08-01
WASP-3b (V=10.6, D=12.2mmag)
HAT-P-7b (V=10.5, D=7.07.0mmag)
2009-04-21
Research assistant: undergraduate
students
30cm refracting telescope
(with a SBIG ST-8E CCD)
F. F. WangWang
X. ZhangX. Zhang N. SongN. Song J. ZhangJ. Zhang
Next Step WorksNext Step Works
• Continuing the transit observations ;Continuing the transit observations ;
• Analyze the results in more details ;Analyze the results in more details ;
• Install our high-res. Spectrograph.Install our high-res. Spectrograph.
So we really need:So we really need:• Your good advice & suggestions !!!Your good advice & suggestions !!!
• Better exoplanet “target” !!Better exoplanet “target” !!
• Good collaborators !!! Good collaborators !!!
• More observing time !More observing time !
Welcome to Welcome to Weihai Weihai !!
Liugong Liugong IslandIsland
Contact:Contact: [email protected]@sdu.edu.cn 0631-5688881(O) 13686318965 (M)
Thank You !! 感 謝 !!