Presentation on theme: "India’s Perspective on Exoplanet Research"— Presentation transcript:
1 India’s Perspective on Exoplanet Research Suvrath Mahadevanon behalf ofAbhijit Chakraborty,Physical Research Laboratory (PRL), Department of Space, India
2 India’s PerspectiveIndia is a relative newcomer to modern exoplanet researchOn going strategyNear Term (within next 1yr)Highly stable fiber fed spectrograph, PARAS, being commissioned at the Mt Abu 1.2m telescope in Jan 2010Long Term (next 5-10 years) possibilitiesDedicated m robotic telescope with PARAS for precision RV followupPossibilities of Space Missions in very preliminary discussion stage
3 ChandraYaan-1 Spacecraft, India’s Moon Mission Polar Satellites Launch Vehicle (PSLV). Payload consists of instuments built by ISRO, ESA, NASA, and some other organizations.ChandraYaan-1 Spacecraft, India’s Moon Mission
4 PRL Advanced Radial Velocity All Sky Search PARASPRL Advanced Radial Velocity All Sky SearchFiber-Fed SpectrographBuilt to be very stableFiber fedTemperature stabilized, and in a vacuum enclosureStar and Th-Ar on different fibers, so simultaneous calibration of Instrument DriftTh-ArStarPARAS, India’s First high efficiency stable echelle spectrograph will be coupled to the Mt Abu 1.2 telescopePARAS Team includes Abhijit Chakraborty (PI), F.M Pathan, Venkatramani, S Mahadevan (PSU), Harvey Richardson (UBC), Arpita Rao, SAC & PRL Engineers
5 PARAS: A stable Fiber Fed Echelle Spectrograph 80 nights per year guaranteed to planet search program with PARASMedian site seeing is 1arcsec. PARAS fiber on sky is 2.35 arcsec- so VERY efficient instrument.150n/yr photometric, ~250 clear nightPARAS coupled to the Mt Abu 1.2 m telescopeInstrument Commissioning on site Jan 2010
6 PARAS: A stable Fiber Fed Echelle Spectrograph PARAS is a R=70k resolution Echelle spectrographComissioning Jan 2010Mt Abu 1.2 Telescope in Indianm simultaneous coverageTh-Ar CalibrationFiber FedWhite Pupil DesignPrism Cross-Diperser100 mm BeamR4 GratingChakraborty, Richardson & Mahadevan, SPIE 2008
7 PARAS: A stable Fiber Fed Echelle Spectrograph 370 nm850nmWide 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 10 -6) minimizing temperature shifts
8 PARAS: A stable Fiber Fed Echelle Spectrograph PARAS will be enclosed in a vacuum vessel and operated at 10-2 mbar for instrument stability.Fully double scrambled fibers for high RV accuracyAcknowledge very useful discussons/input from F. Pepe, S. Udry Geneva Obs.
9 PARAS: A stable Fiber Fed Echelle Spectrograph The main Optics are expected to arrive from SESO (France) in late Nov 09.Vacuum ChamberInside viewPrism
10 PARAS: A stable Fiber Fed Echelle Spectrograph Prism31.6g/mm R4 echelle grating in its storage cellCamera systems from IR labs with a vibration damping system to reduce cryotiger vibration amplitude to 10nm
11 PARAS: A stable Fiber Fed Echelle Spectrograph Dedicated Insulated Room has been constructed in the Mt Abu observatory to house the PARAS instrumentInsulation and active temperature control of room will maintain the instrument temperature at 0.01 deg C around the set point of 25CPrism
12 PARAS: A stable Fiber Fed Echelle Spectrograph IncludeTelescope F/13 to Fiber F/4 transfer opticsTelescope Focus& Pinhole position50micron Fiber TipJacketed Fiber tipF/4 DoubletF/13 DoubletJacketed Fiber tipCustom 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.F/4 Doublet
13 Dedicated 50cm Photometric Telescope IncludeDedicated 50 cm Photometric telescope will be available at the Mt Abu site by December 2009Equipped with a 4k x 4k front illuminated CCD (QE=60% in V)FOV is 37 x 37 arcminWill be useful for photometric monitoring of PARAS candidates, known transits, and wide field searchesPRL Exoplanet Programs are Supported by the Govt. of India, Department of Space, and the PRL director (J.N. Goswami)
14 PARAS + Dedicated 50cm Photometric Telescope IncludeRefining 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
15 Science with ongoing Programs IncludeComplementary 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 MARVELSLong term monitoring of bright stars to discover low mass exoplanets.Stellar astrophysics studies will also be enabled.
16 Future PlansPARAS has been built to be very efficient and can be coupled to a future m telescope with very little additional slit lossesGoal 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 candidatesLonger term ideas for possible space missions in very preliminary discussion stage
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