Presentation on theme: "Indias Perspective on Exoplanet Research Suvrath Mahadevan on behalf of Abhijit Chakraborty, Physical Research Laboratory (PRL), Department of Space, India."— Presentation transcript:
Indias Perspective on Exoplanet Research Suvrath Mahadevan on behalf of Abhijit Chakraborty, Physical Research Laboratory (PRL), Department of Space, India
Indias Perspective India is a relative newcomer to modern exoplanet research On going strategy Near Term (within next 1yr) Highly stable fiber fed spectrograph, PARAS, being commissioned at the Mt Abu 1.2m telescope in Jan 2010 Long Term (next 5-10 years) possibilities Dedicated m robotic telescope with PARAS for precision RV followup Possibilities of Space Missions in very preliminary discussion stage
ChandraYaan-1 Spacecraft, Indias Moon Mission Polar Satellites Launch Vehicle (PSLV). Payload consists of instuments built by ISRO, ESA, NASA, and some other organizations.
PARAS PRL Advanced Radial Velocity All Sky Search Fiber-Fed Spectrograph Built to be very stable Fiber fed Temperature stabilized, and in a vacuum enclosure Star and Th-Ar on different fibers, so simultaneous calibration of Instrument Drift Star Th-Ar PARAS, Indias First high efficiency stable echelle spectrograph will be coupled to the Mt Abu 1.2 telescope PARAS Team includes Abhijit Chakraborty (PI), F.M Pathan, Venkatramani, S Mahadevan (PSU), Harvey Richardson (UBC), Arpita Rao, SAC & PRL Engineers
80 nights per year guaranteed to planet search program with PARAS Median site seeing is 1arcsec. PARAS fiber on sky is 2.35 arcsec- so VERY efficient instrument. 150n/yr photometric, ~250 clear night PARAS coupled to the Mt Abu 1.2 m telescope Instrument Commissioning on site Jan 2010 PARAS: A stable Fiber Fed Echelle Spectrograph
PARAS is a R=70k resolution Echelle spectrograph Comissioning Jan 2010 Mt Abu 1.2 Telescope in India nm simultaneous coverage Th-Ar Calibration Fiber Fed White Pupil Design Prism Cross-Diperser Chakraborty, Richardson & Mahadevan, SPIE mm Beam R4 Grating
PARAS: A stable Fiber Fed Echelle Spectrograph 370 nm 850nm Wide Simultaneous Wavelength Coverage with a 4k x 4k deep depletion e2v CCD. CaII HK-Ca NIR Triplet coverage in one shot. PBM8Y prism has low dn/dT (3 X ) minimizing temperature shifts
PARAS: A stable Fiber Fed Echelle Spectrograph PARAS will be enclosed in a vacuum vessel and operated at mbar for instrument stability. Fully double scrambled fibers for high RV accuracy Acknowledge very useful discussons/input from F. Pepe, S. Udry Geneva Obs.
The main Optics are expected to arrive from SESO (France) in late Nov 09. Inside view Prism Vacuum Chamber PARAS: A stable Fiber Fed Echelle Spectrograph
Prism PARAS: A stable Fiber Fed Echelle Spectrograph 31.6g/mm R4 echelle grating in its storage cell Camera systems from IR labs with a vibration damping system to reduce cryotiger vibration amplitude to 10nm
Prism PARAS: A stable Fiber Fed Echelle Spectrograph Dedicated Insulated Room has been constructed in the Mt Abu observatory to house the PARAS instrument Insulation and active temperature control of room will maintain the instrument temperature at 0.01 deg C around the set point of 25C
IncludeInclude Telescope Focus & Pinhole position 50micron Fiber Tip Telescope F/13 to Fiber F/4 transfer optics F/13 Doublet F/4 Doublet Jacketed Fiber tip PARAS: A stable Fiber Fed Echelle Spectrograph Custom made fiber assembly by Polymicro has both fibers in the same epoxy with a 180um space between them. Monolithic assembly minimized drifts between the star and calib fibers.
IncludeInclude Dedicated 50cm Photometric Telescope Dedicated 50 cm Photometric telescope will be available at the Mt Abu site by December 2009 Equipped with a 4k x 4k front illuminated CCD (QE=60% in V) FOV is 37 x 37 arcmin Will be useful for photometric monitoring of PARAS candidates, known transits, and wide field searches PRL Exoplanet Programs are Supported by the Govt. of India, Department of Space, and the PRL director (J.N. Goswami)
IncludeInclude PARAS + Dedicated 50cm Photometric Telescope Refining Ephemerids with RV and then searching transit windows to find long period TRANSITING planets around BRIGHT stars with KNOWN RV planets – see TERMS poster by Stephen Kane
Complementary photometric capability along with PARAS enables scientific programs like the search for transits around long period exoplanets by refining their transit windows with RV and then observing with the 50cm telescope, and with PARAS to detect the transit with photometry and Rossiter McLaughlin. Also a good suite to confirm candidate exoplanets around giant stars detected with ongoing surveys like that at the HET. PARAS red wavelengths useful to test concepts of radial velocity extraction in presence of telluric features. Essential test for future NIR spectrographs. Possible follow-up and confirmation of candidates from ongoing multi-object RV surveys like SDSSIII MARVELS Long term monitoring of bright stars to discover low mass exoplanets. Stellar astrophysics studies will also be enabled. Science with ongoing Programs IncludeInclude
Future Plans PARAS has been built to be very efficient and can be coupled to a future m telescope with very little additional slit losses Goal is to have a dedicated 2.5m robotic telescope for PARAS and for RV searches by Long term monitoring of bright stars ar high RV precision, followup and confirmation of long period candidates Longer term ideas for possible space missions in very preliminary discussion stage