Progress of LiJET and transit search with Lijiang 2.4m telescope

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Progress of LiJET and transit search with Lijiang 2.4m telescope. Jinming Bai ( 白金明 ) Yunnan Observatory 2009-10-7. LiJET: Lijiang Exoplanet Tracker using Doppler dispersed fix-delay interferometer technique. by: - PowerPoint PPT Presentation

Transcript of Progress of LiJET and transit search with Lijiang 2.4m telescope

  • Progress of LiJET and transit search with Lijiang 2.4m telescopeJinming Bai () Observatory


  • LiJET: Lijiang Exoplanet Trackerusing Doppler dispersed fix-delay interferometer techniqueby:Florida University (Jian Ge group), USAYunnan Observatory, CAS, ChinaNanjing University, Chinaat: the 2.4m telescope in Lijiang

  • In late 2006, got supports from China and USA (1:1): NFSC, NSF, W.M. Keck Foundation, UCF-UF SRI program and UFIn 2007, hardware and software design started, 4 young engineers from YNAO and USTC went to Florida University joining Jian Ges groupIn 2008, design finished, start producing The LiJET Project

  • Major Tasks and Schedule

  • Schematic Layout for an ET InstrumentHET FiberFringesDispersed FringesIodine Cell FibersTelescopeDetectorErskine & Ge (2000), Ge et al. (2002), Ge (2002)Medium resolution spectrograph R=5000-10,000

  • Optical Design of RV ModeFiber inputMonolithic InterferometerPrismEchelle4kx4k CCDCollimator-cameraSlitOutput 1Output 2 Spectral resolution R~18,000 in 0.39-0.70 m

  • Final Mechanical Layout of LiJETEchellePrismCollimator/camera4kx4k CCD cameraInterferometerInput fiber feed

  • A Monolithic Interferometer for LiJETField and thermal compensationRV thermal drift ~ 0.5m/s/mKAssembled interferometer

  • LiJET inside an Airtight Chamber in a Thermal EnclosureAir legsThermal enclosureVacuum chamber The thermal enclosure dimension: 69" x 45" x 39.9 Thermal stability, ~1 mK over a short time and ~3mK over a long time

  • Vacuum ChamberThermal enclosure Echelle spectrographPrismCollimatorAssembled instrument in UF lab

  • The LiJET Room in the dome of 2.4m

  • Pipeline and Analysis SoftwareFRANCIS FRinge Analysis Code for Interferometric SpectroscopyStatistical analysis PackageOptimal scheduling long-term velocity drifting correctionStar parameterextractionModifying existing developingMarkov Chain Monte Calo (MCMC )

  • LiJET Design Parameters NameRV Mode

    Fiber core diameter 72 m Fiber input focal ratiof/4 Image size on sky (arcsec)1.55 Fiber output focal ratiof/4 Collimator beam diameter80 mm Camera focal ratio f/4 Wavelength coverage390-700 nm Main disperser87 l/mm R2 echelle Cross-disperser 45 degree PBM2Y prism Resolution elements4.8 pixels Spectral resolution18,000 CCD detector4kx4k with 15 m pixels

  • LiJET design throughput

  • Photon limited RV precision of 15 min exposures with LiJET at Lijiang 2.4m telescopeMagnitude RV precisionV=60.4 m/sV=70.6 m/sV=81.0 m/sV=91.6 m/sV=102.5 m/s

  • Peng, Fleming et al. 2009RV precision for different type stars and with different rotation velocity

  • Transiting planet candidates follow-up with LiJETCandidates are from:MARVELS (Multi-object APO Radial-Velocity Exoplanet Large-area Survey) SuperWASP (Super Wide Angle Search for Planets)YFOSC and Mosaic CCD camera transits search in open clusters at 2.4m telescopeMain aim:To confirm planet detection and discover new planetsTo detect low mass (a few Earth masses) exoplanets around nearby planet-hosting bright stars with V
  • Detect super-earth planets around bright starsconstraining planet formation theoryhabitable planet search Signature of ice line and type I migration Schilaufman Ida & Lin 2009LiJET sensitivity for V
  • Detection of Earth-like short period planets with intensive LiJET observations 2 Earth mass planet, 2.2 day period around a solar type star, K= 1m/s= 1m/s, 60 measurements, clear detection with 0.1% FAP

  • SummaryThe designed precision of LiJET is sub m/s can discover earth-like planets and multi-planet system of bright starsPlanet Candidates of LiJET are from MARVELS and SuperWASP todetermine the orbit parameters of planetssearch multi-planet systemsearth-like planets in late type stars

  • Thank You!