RoboPol: a four-channel optical imaging polarimeter

  title={RoboPol: a four-channel optical imaging polarimeter},
  author={Anamparambu N. Ramaprakash and Chaitanya V. Rajarshi and Hillol K. Das and Pravin Khodade and Deepa Modi and Georgia V. Panopoulou and Siddharth Maharana and Dmitry Blinov and Emmanouil Angelakis and Carolina Casadio and Lars Fuhrmann and Talvikki Hovatta and Sebastian Kiehlmann and Oliver G. King and Nikolaos D. Kylafis and Alexandra Kougentakis and Andrzej J. Kus and Ashish A. Mahabal and A Marecki and Ioannis Myserlis and George Paterakis and E. Paleologou and Ioannis Liodakis and I. E. Papadakis and I. Papamastorakis and V. Pavlidou and Eugeniusz Pazderski and T. J. Pearson and Anthony C. S. Readhead and Pablo Reig and A Słowikowska and Konstantinos Tassis and J. Anton Zensus},
  journal={Monthly Notices of the Royal Astronomical Society},
We present the design and performance of RoboPol, a four-channel optical polarimeter operating at the Skinakas Observatory in Crete, Greece. RoboPol is capable of measuring both relative linear Stokes parameters q and u (and the total intensity I) in one sky exposure. Though primarily used to measure the polarization of point sources in the R band, the instrument features additional filters (B, V, and I), enabling multiwavelength imaging polarimetry over a large field of view (13.6′ × 13.6… 
WALOP-South: a four-camera one-shot imaging polarimeter for PASIPHAE survey. Paper I—optical design
Abstract. The Wide-Area Linear Optical Polarimeter (WALOP)-South instrument will be mounted on the 1-m South African Astronomical Observatory telescope in South Africa as part of the Polar-Areas
WALOP-South: A wide-field one-shot linear optical polarimeter for PASIPHAE survey
WALOP (Wide-Area Linear Optical Polarimeter)-South, to be mounted on the 1m SAAO telescope in South Africa, is first of the two WALOP instruments currently under development for carrying out the
The RoboPol Program: Optical Polarimetric Monitoring of Blazars
After three years of polarimetric monitoring of blazars, the RoboPol project has uncovered several key characteristics of polarimetric rotations in the optical for these most variable sources. The
Simulations of polarimetric observations of debris disks through the Roman Coronagraph Instrument
The Roman coronagraph instrument will demonstrate high-contrast imaging technology, enabling the imaging of faint debris disks, the discovery of inner dust belts, and planets. Polarization studies of
The time-dependent distribution of optical polarization angle changes in blazars
At optical wavelengths, blazar Electric Vector Position Angle (EVPA) rotations linked with gamma-ray activity have been the subject of intense interest and systematic investigation for over a
Multiwavelength Variability of BL Lacertae Measured with High Time Resolution
In an effort to locate the sites of emission at different frequencies and physical processes causing variability in blazar jets, we have obtained high time-resolution observations of BL Lacertae over
Mapping the Magnetic Interstellar Medium in Three Dimensions over the Full Sky with Neutral Hydrogen
Recent analyses of 21 cm neutral hydrogen (H i) emission have demonstrated that H i gas is organized into linear filamentary structures that are preferentially aligned with the local magnetic field,
Extreme starlight polarization in a region with highly polarized dust emission
Context. Galactic dust emission is polarized at unexpectedly high levels, as revealed by Planck. Aims. The origin of the observed ≃20% polarization fractions can be identified by characterizing the
Revisiting the Distance to Radio Loops I and IV Using Gaia and Radio/Optical Polarization Data
Galactic synchrotron emission exhibits large angular scale features known as radio spurs and loops. Determining the physical size of these structures is important for understanding the local
Evidence for line-of-sight frequency decorrelation of polarized dust emission in Planck data
If a single line of sight (LOS) intercepts multiple dust clouds with different spectral energy distributions and magnetic field orientations, then the frequency scaling of each of the Stokes Q and U


An imaging polarimeter (IMPOL) for multi-wavelength observations
Taking advantage of the advances in array detector technology, an imaging polarimeter (IMPOL) has been constructed for measuring linear polarization in the wavelength band from 400-800 nm. It makes
Device for optical linear polarization measurements with a single exposure
The use of CCDs as focal plane detectors has changed the design concept for the polarimetric mode in the visible and, actually, also in the near infrared spectral ranges. Providing astronomical
Wide-field one-shot optical polarimeter: HOWPol
For prompt optical polarimetry of gamma-ray burst (GRB) afterglow, we require wide-field imaging polarimeter which can produce both Stokes Q and U parameters from only a single exposure, as well as
Simultaneous Linear and Circular Optical Polarimetry of Asteroid (4) Vesta
From a single 3.8 hr observation of the asteroid (4) Vesta at 13.°7 phase angle with the POlarimeter at Lick for Inclination Studies of Hot jupiters 2 (POLISH2) at the Lick Observatory Shane 3 m
A novel quadruple beam imaging polarimeter and its application to Comet Tanaka-Machholz 1992 X
For observations of solar system objects an imaging polarimeter has been constructed as an auxiliary instrument for a f/15 focal reducer. With this instrument simultaneous measurement of theQ andU
DIPOL-2: a double image high precision polarimeter
We have built a new broad-band polarimeter (DIPOL-2), capable of measuring polarization with the precision at the 10-5 level. Two dichroic beam-splitters are used to split light into three passbands
The RoboPol optical polarization survey of gamma-ray-loud blazars
We present first results from RoboPol, a novel-design optical polarimeter operating at the Skinakas Observatory in Crete. The data, taken during the 2013 May–June commissioning of the instrument,
Optical polarization map of the Polaris Flare with RoboPol
The stages before the formation of stars in molecular clouds are poorly understood. Insights can be gained by studying the properties of quiescent clouds, such as their magnetic field structure. The
Wedged double Wollaston, a device for single shot polarimetric measurements
Simultaneous measurements of the polarized flux at angles 0, 45, 90 and 135 degrees can be per- formed by inserting a simple combination of two Wollaston prisms and two wedges (cf. Fig. 1) in the
RoboPol: optical polarization-plane rotations and flaring activity in blazars
We present measurements of rotations of the optical polarization of blazars during the second year of operation of RoboPol, a monitoring programme of an unbiased sample of gamma-ray bright blazars