1 / 21

Progress of LiJET and transit search with Lijiang 2.4m telescope

Progress of LiJET and transit search with Lijiang 2.4m telescope. Jinming Bai ( 白金明 ) baijinming@mail.ynao.ac.cn Yunnan Observatory 2009-10-7. LiJET: Lijiang Exoplanet Tracker using Doppler dispersed fix-delay interferometer technique. by:

gordy
Download Presentation

Progress of LiJET and transit search with Lijiang 2.4m telescope

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Progress of LiJET and transit search with Lijiang 2.4m telescope Jinming Bai (白金明) baijinming@mail.ynao.ac.cn Yunnan Observatory 2009-10-7

  2. LiJET:Lijiang Exoplanet TrackerusingDoppler dispersed fix-delay interferometer technique by: Florida University (Jian Ge’ group), USA Yunnan Observatory, CAS, China Nanjing University, China at: the 2.4m telescope in Lijiang

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

  4. Major Tasks and Schedule

  5. Schematic Layout for an ET Instrument Fringes Telescope Iodine Cell HET Fibers Fiber Dispersed Fringes Medium resolution spectrograph R=5000-10,000 Detector Erskine & Ge (2000), Ge et al. (2002), Ge (2002)

  6. Optical Design of RV Mode Prism Echelle 4kx4k CCD Slit Collimator-camera Output 1 Output 2 Fiber input Monolithic Interferometer Spectral resolution R~18,000 in 0.39-0.70 m

  7. Final Mechanical Layout of LiJET 4kx4k CCD camera Prism Echelle Input fiber feed Interferometer Collimator/camera

  8. A Monolithic Interferometer for LiJET Assembled interferometer • Field and thermal compensation • RV thermal drift ~ 0.5m/s/mK

  9. LiJET inside an Airtight Chamber in a Thermal Enclosure Vacuum chamber Thermal enclosure Air legs • The thermal enclosure dimension: 69" x 45" x 39.9“ • Thermal stability, ~1 mK over a short time and ~3mK over a long time

  10. Echelle spectrograph Assembled instrument in UF lab Collimator Prism Vacuum Chamber Thermal enclosure

  11. The LiJET Room in the dome of 2.4m

  12. Pipeline and Analysis Software FRANCIS FRinge Analysis Code for Interferometric Spectroscopy Modifying existing Statistical analysis Package Optimal scheduling long-term velocity drifting correction Star parameter extraction developing Markov Chain Monte Calo (MCMC)

  13. LiJET Design Parameters Name RV Mode Fiber core diameter 72 m Fiber input focal ratio f/4 Image size on sky (arcsec) 1.55 Fiber output focal ratio f/4 Collimator beam diameter 80 mm Camera focal ratio f/4 Wavelength coverage 390-700 nm Main disperser 87 l/mm R2 echelle Cross-disperser 45 degree PBM2Y prism Resolution elements 4.8 pixels Spectral resolution 18,000 CCD detector 4kx4k with 15 m pixels

  14. LiJET design throughput

  15. Photon limited RV precision of 15 min exposures with LiJET at Lijiang 2.4m telescope Magnitude RV precision V=6 0.4 m/s V=7 0.6 m/s V=8 1.0 m/s V=9 1.6 m/s V=10 2.5 m/s

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

  17. Transiting planet candidates follow-up with LiJET • Candidates 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 telescope • Main aim: • To confirm planet detection and discover new planets • To detect low mass (a few Earth masses) exoplanets around nearby planet-hosting bright stars with V<8 • To find systems with more than one giant planets • To determine planet parameters for planet candidates being ‘significantly’ detected in the MARVELS but not well determined orbit parameter

  18. Detect super-earth planets around bright stars constraining planet formation theory habitable planet search LiJET sensitivity for V<8 stars Signature of ice line and type I migration Schilaufman Ida & Lin 2009

  19. 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

  20. Summary • The designed precision of LiJET is sub m/s， can discover earth-like planets and multi-planet system of bright stars • Planet Candidates of LiJET are from MARVELS and SuperWASP to • determine the orbit parameters of planets • search multi-planet systems • earth-like planets in late type stars

  21. Thank You!

More Related