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ARIES Recruitment 2020 @ www.aries.res.in

ARIES Scientist-B Recruitment 2020

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Aryabhatta Research Institute of Observational Sciences(ARIES Recruitment 2020)

The Institute has extended its horizon to theoretical and numerical studies in Relativistic Astrophysics. The unique position of ARIES (79° East), places it at almost in the middle of 180° wide longitude band, between Canary Island (20° West) and Eastern Australia (157° East), and therefore complements observations which might not be possible from either of these two places. ARIES has made a unique contribution from time to time. To quote examples from the past the first successful Indian optical observations of the afterglow of the gamma-ray burst were carried out from ARIES on January 23, 1999, a few micro-lensing events and quasar variability, new ring systems around Saturn, Uranus, and Neptune were also discovered.

The Institute hosts three telescopes of apertures 104-cm, 130-cm and 3.6-mDOT. There is a 15-cm telescopes dedicated for solar observations. The 104-cm optical telescope is being used as a main observing facility by the ARIES scientists since 1972. It is equipped with 2k x 2k, and 1k x 1k liquid N cooled CCD cameras, fast photometer, spectrophotometer, and standard astronomical 2 filters. The telescope uses a SBIG ST-4 camera for auto-guiding through an auxiliary 20-cm telescope.

In order to carry out observations in the frontier areas of astronomy, the Institute has installed 130-cm and 360-cm optical telescopes at a site called ‘Devasthal’ at a distance of ~ 60-Km from ARIES, which has the advantages of having dark skies and excellent observing conditions.

The Scientists from the Solar group of ARIES are also participating in the national projects like space coronagraph and National Large Solar Telescope (NLST). There are different instruments for observation of the physical and optical properties of aerosols and trace gas. An 84-cm micro-pulse LIDAR system for high altitude studies of aerosols and an ST Radar (Stratosphere Troposphere Radar) to measure winds speed up to an altitude of around 20 km is also being set up.

Projects

Scientific Objectives

India has already developed a world class observing facilities at radio wavelengths (GMRT) and currently developing space based observing facilities at X-ray and ultra-violet wavelengths ( ASTROSAT and TAUVEX ). However, we still lack of a world class observing facilities for ground - based optical astronomy. It felt that the time for the Indian astronomical community has come to set up a ground based modern optical observing facility of at least 3 - 4 m class in near future and plan for a larger telescope.

In near future, the installation of a 3.6 m optical telescope will be advantageous for many scientific programmes, some of the science drivers are as follows:

• Studying the magnetic field structure of stars
• Studying chemical evolution of Milky -Way via stellar ISM abundance
• The search for extrasolar planets
• Kinematics of stars in the outer region and the halo of the Milky-Way
• Polarization properties of BL-Lac and other galactic nuclei
• NIR spectroscopy and narrow-band imaging of the galactic HII regions and star clusters to understand the formation of stars and their evolution in a different environment
• Optical spectroscopy and deep time-resolved imaging of galactic X-Ray binaries to understand the kinematics of accretion disk
• NIR spectroscopy of debris around stars to understand planet formation

Current Status

The proposed 3.6 m telescope will be optimized for the spectroscopic observations. ARIES made serious efforts to involve international community for technical and financial support in this project. The success came as Russian Academy of Sciences and Belgium astronomers decided to participate in this project. National Institutes like IIA, TIFR are also participating in this project. It is also proposed that (I) A high resolution (~ 50,000 ) stellar spectro-polarimeter (II) Faint object spectrograph camera and (iii) Near IR camera are to be developed as the first generation instruments.

A contract for design, manufacture, integration, testing, supply and installation of the telescope has been entered between ARIES and AMOS, Belgium on 29th March 2007. The optical subsystem specifications are as follows :

1. Size of primary mirror : 3.6m ( Clear aperture)
2. Material of the primary mirror : SCHOTT Zerodur
3. Material of the secondary mirror : Sitall- Co - 115m
4. Primary focal ratio : f/2
5. Configuration: Ritchey-Chretien (RC) with Cassegrain focus
6. Effective focal ratio: f/9
7. Operational waveband: 350 to 5000 nm
8. Science field of view: 10 arc min without corrector and 30 arc min unvignetted field for axial port and 10 arc min for side ports
9. Optical image quality: 50% energy in < 0.3 arc sec diameter, 80% energy in < 0.45 arc sec diameter and 90% energy in < 0.6 arc sec diameter ( for 10 arc min field without corrector)
10. Location of Cassegrain focus: 1. 50 cm (approx.) behind the instrument flange

Mechanical Specifications

1. Mounting: Alt-Azimuth
2. Zenith blind spot: Less than two degree conical diameter
3. Instrument envelope: Cylindrical space of minimum 2.5 meter below the focal plane for axial port and approximately 3.0 meter diameter around optical axis
4. Pointing accuracy: < 2 arc sec RMS for any point in the sky with elevation > 10 degree, < 0.1 arc sec RMS for 10 arc min off set
5. Tracking accuracy: < 0.1 arc sec RMS for < one minute in open loop, < 0.1 arc sec RMS for < one hour in closed loop (with auto guider) and < 0.5 arc sec peak for < 15 min in open loop
6. Max slow speed: 20 per sec
7. Retargeting time: < 30 sec for 20 move
8. The rotation freedom: In Azimuth ± 270 0 and in Altitude 100 to 900
9. Acquisition and guiding unit will be provided
10. Five axis motion of secondary mirror will be provided

Control Systems

1. Suitable modern computer based control system for operating and controlling the telescope under all possible observing situations
2. Complete computer control of the telescope with network operational capability

To achieve the above specifications, AMOS plans to implement active optics on this telescope. The active optics concept is

1. The primary mirror will have its out-of-plane shape actively driven by a set of force-controlled axial actuators. The lateral supports will be passive.
2. The secondary mirror will have passive axial and lateral supports but will be positioned in 5 axes (focus, centering, and tilts) by a hexapod to compensate misalignment with primary.
3. Both active subsystems will receive their setpoints online from a wavefront sensor.

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#FAQ Time For ARIES Recruitment 2020