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  • CHESS: An innovative concept for high-resolution, far-UV spectroscopy
    Exp. Astron. (IF 1.489) Pub Date : 2020-10-01
    Keri Hoadley, Kevin France, Nicholas Nell, Robert Kane, Brian Fleming, Allison Youngblood, Matthew Beasley

    The space ultraviolet (UV) is a critical astronomical observing window, where a multitude of atomic, ionic, and molecular signatures provide crucial insight into planetary, interstellar, stellar, intergalactic, and extragalactic objects. The next generation of large space telescopes require highly sensitive, moderate-to-high resolution UV spectrograph. However, sensitive observations in the UV are

  • First light of SOVAG, a spectrograph for visible and near-infrared observation of asteroids
    Exp. Astron. (IF 1.489) Pub Date : 2020-10-15
    M. Birlan, F. Colas, F. Cochard, D. Darson, B. Carry, P. Vernazza, A. Nedelcu, J. Dubois, S. Fornasier, D. Perna, P. Morfin

    Spectroscopy in the visible and near-infrared has been the main tool for characterising the surface properties of asteroids for decades. For a given target, the two wavelength regimes are usually acquired by different telescopes/instruments, separated by years. They are seldom obtained simultaneously. However, it is not straightforward to combine datasets from different sources because of the spectral

  • Scatter due to Ultraviolet (UV) photopolymerization of molecular contamination on optical surfaces
    Exp. Astron. (IF 1.489) Pub Date : 2020-10-13
    Venkata Suresh Narra, Raghavendra Prasad Budihal, Pawan Kumar Somasundaram, Kathiravan Sriraman, Natarajan Venkatasubramanian, Umesh Kamath Padavu, Vishnu Tulasi Mani, Suresha Basavaraja, Rajesh Naik

    Molecular contamination on optical surfaces is a serious issue for space payloads. For ultraviolet (UV) payloads, molecular contamination results in loss of throughput. Whereas, for visible (VIS) payloads loss of throughput due to molecular contamination is not very critical. However, UV photopolymerization of molecular contamination can create serious problems to VIS payloads with stringent scatter

  • ArielRad: the Ariel radiometric model
    Exp. Astron. (IF 1.489) Pub Date : 2020-10-13
    Lorenzo V. Mugnai, Enzo Pascale, Billy Edwards, Andreas Papageorgiou, Subhajit Sarkar

    ArielRad, the Ariel radiometric model, is a simulator developed to address the challenges in optimising the space mission science payload and to demonstrate its compliance with the performance requirements. Ariel, the Atmospheric Remote-Sensing Infrared Exoplanet Large-survey, has been selected by ESA as the M4 mission in the Cosmic Vision programme and, during its 4 years primary operation, will provide

  • CAPTURE: a continuum imaging pipeline for the uGMRT
    Exp. Astron. (IF 1.489) Pub Date : 2020-10-12
    Ruta Kale, C. H. Ishwara-Chandra

    We present the first fully automated pipeline for making images from the interferometric data obtained from the upgraded Giant Metrewave Radio Telescope (uGMRT) called CAsa Pipeline-cum-Toolkit for Upgraded Giant Metrewave Radio Telescope data REduction - CAPTURE. It is a python program that uses tasks from the NRAO Common Astronomy Software Applications (CASA) to perform the steps of flagging of bad

  • Design of Pocket-GMT: an optical emulation of the Giant Magellan Telescope
    Exp. Astron. (IF 1.489) Pub Date : 2020-10-06
    Josephine Munro, Marcus Lingham, Luke Gers, Nicholas Herrald, Tony Travouillon, Antonin Bouchez

    The concept design for a laboratory based telescope emulator for the Giant Magellan Telescope (GMT) is described here. The Giant Magellan Telescope has a primary mirror comprised of 7 segments, and a secondary mirror with matching segmentation. The phasing of the GMT is a complex problem; a phasing testbed, Pocket-GMT, has been designed by a group within the Research School of Astronomy and Astrophysics

  • End to end simulators: a flexible and scalable cloud-based architecture
    Exp. Astron. (IF 1.489) Pub Date : 2020-09-21
    M. Genoni, M. Landoni, G. Pariani, M. Riva, A. Bianco, G. Li Causi, T. Marquart, F. A. Pepe, A. Marconi, E. Oliva

    Simulations of frames from existing and upcoming high-resolution spectrographs, targeted for high accuracy radial velocity measurements, are computationally demanding (both in time and space). We present in this paper an innovative approach based on both parallelization and distribution of the workload. By using NVIDIA CUDA custom-made kernels and state-of-the-art cloud-computing architectures in a

  • Energy sensitivity of the GRAPES-3 EAS array for primary cosmic ray protons
    Exp. Astron. (IF 1.489) Pub Date : 2020-09-12
    B. Hariharan, S. Ahmad, M. Chakraborty, A. Chandra, S. R. Dugad, S. K. Gupta, Y. Hayashi, H. Kojima, S. S. R. Inbanathan, P. Jagadeesan, A. Jain, P. Jain, V. B. Jhansi, S. Kawakami, P. K. Mohanty, S. D. Morris, P. K. Nayak, A. Oshima, D. Pattanaik, P. S. Rakshe, K. Ramesh, B. S. Rao, L. V. Reddy, S. Shibata, F. Varsi, M. Zuberi

    Low energy ground-based cosmic ray air shower experiments generally have energy threshold in the range of a few tens to a few hundreds of TeV. The shower observables are measured indirectly with an array of detectors. The atmospheric absorption of low energy secondaries limits their detection frequencies at the Earth’s surface. However, due to selection effects, a tiny fraction of low energy showers

  • Mapper of Narrow Galaxy Lines (MaNGaL): new tunable filter imager for Caucasian telescopes
    Exp. Astron. (IF 1.489) Pub Date : 2020-09-03
    Alexei Moiseev, Aleksander Perepelitsyn, Dmitry Oparin

    We described the design and operation principles of a new tunable-filter photometer developed for the 1-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences and the 2.5-m telescope of the Sternberg Astronomical Institute of the Moscow State University. The instrument is mounted on the scanning Fabry-Perot interferometer operating in the tunable-filter mode in the

  • Photometry of exoplanetary transits at Osservatorio Polifunzionale del Chianti
    Exp. Astron. (IF 1.489) Pub Date : 2020-08-31
    L. Naponiello, L. Betti, A. Biagini, M. Focardi, E. Papini, R. Stanga, D. Trisciani, M. Agostini, V. Noce, L. Fini, E. Pace

    In this paper we report the observations of HD189733b, Kepler-41b, Kepler-42b, GJ 436b, WASP-77ab, HAT-P-32b and EPIC 211818569 as measured at the Osservatorio Polifunzionale del Chianti, a new astro-nomical site in Italy. Commissioning observing runs have been done in order to test capabilities, systematics and limits of the system and to improve its accuracy. For this purpose, a software algorithm

  • Baryon acoustic oscillations from Integrated Neutral Gas Observations: Broadband corrugated horn construction and testing
    Exp. Astron. (IF 1.489) Pub Date : 2020-07-24
    C. A. Wuensche; L. Reitano; M. W. Peel; I. W. A. Browne; B. Maffei; E. Abdalla; C. Radcliffe; F. Abdalla; L. Barosi; V. Liccardo; E. Mericia; G. Pisano; C. Strauss; F. Vieira; T. Villela; B. Wang

    The Baryon acoustic oscillations from Integrated Neutral Gas Observations (BINGO) telescope is a 40-m class radio telescope under construction that has been designed to measure the large-angular-scale intensity of Hi emission at 980–1260 MHz and hence to constrain dark energy parameters. A large focal plane array comprising of 1.7-metre diameter, 4.3-metre length corrugated feed horns is required in

  • Atmospheric Characterization via Broadband Color Filters on the PLAnetary Transits and Oscillations of stars (PLATO) Mission
    Exp. Astron. (IF 1.489) Pub Date : 2020-07-22
    John Lee Grenfell; Mareike Godolt; Juan Cabrera; Ludmila Carone; Antonio Garcίa Muñoz; Daniel Kitzmann; Alexis M. S. Smith; Heike Rauer

    We assess broadband color filters for the two fast cameras on the PLAnetary Transits and Oscillations of stars (PLATO) space mission with respect to exoplanetary atmospheric characterization. We focus on Ultra Hot Jupiters and Hot Jupiters placed 25pc and 100pc away from the Earth and warm Super-Earths placed 10pc and 25pc away. Our analysis takes as input literature values for the difference in transit

  • EREBUS: the EuRopean Extinction BUmp Survey
    Exp. Astron. (IF 1.489) Pub Date : 2020-07-21
    L. Capitanio; M. Bartylak; M. Cui; B. Engegaard; M. Gassner; S. G. Heinemann; G. Kargl; S. T. Latzko; P. G. Madonia; A. J. May; A. Postel; J. Rodriguez Munoz; G. J. Schwarzkopf; R. F. Shipman; R. Skalidis; V. Trivino Herrero; K. Wikman

    Dust in the Interstellar Medium (ISM) is intimately linked to the life cycle of stars. Despite being of such fundamental importance to galaxy evolution, the dynamic behaviour and composition of the ISM are not yet fully understood. Observations of reddened Milky Way OB stars have revealed a strong UV extinction feature around 2175 Å and a precipitous extinction rise to the far UV along the lines of

  • Design of a hybrid refractive-diffractive telescope for observations in UV
    Exp. Astron. (IF 1.489) Pub Date : 2020-07-19
    Grzegorz Fluder

    Telescopes are one of the common types of satellite payloads. They are used both for Earth and astronomical observations. By using space telescopes it is possible to eliminate the negative effect of the atmosphere on image quality. Additionally, observations in some spectral ranges can be performed only from space due to absorption of certain wavelengths in the atmosphere. One such range is UV below

  • Creating a large aspheric primary mirror using spherical segments
    Exp. Astron. (IF 1.489) Pub Date : 2020-07-06
    Annu Jacob; Padmakar Parihar; Melvin K. James

    The use of aspheric mirrors is a common practice to design astronomical telescopes with a few optical elements. In the most preferred optical design Ritchey Chretien (RC), both primary and secondary mirrors are hyperboloid. Nowadays large telescopes are being built using small mirror segments, however, making aspheric off-axis mirror segments is still a challenge. We have conducted a study in which

  • Ultra-Long Gamma-Ray Bursts detection with SVOM/ECLAIRs
    Exp. Astron. (IF 1.489) Pub Date : 2020-07-04
    Nicolas Dagoneau; Stéphane Schanne; Jean-Luc Atteia; Diego Götz; Bertrand Cordier

    Ultra-long Gamma-Ray Bursts (ulGRBs) are Gamma-Ray Bursts (GRBs) with an unusually long emission in X and gamma rays, reaching durations of thousands of seconds. They could form a specific class of high-energy transient events, whose origin is still under discussion. The current sample of known ulGRBs consists of a few tens of events which have been detected so far by the Burst Alert Telescope (BAT)

  • On the optimal calibration of VVV photometry
    Exp. Astron. (IF 1.489) Pub Date : 2020-06-19
    Gergely Hajdu; István Dékány; Márcio Catelan; Eva K. Grebel

    Prompted by some inconsistencies in the photometry of the VISTA Variables in the Vía Láctea (VVV) survey, we conduct a revision of the standard calibration procedure of VISTA data in the J, H, and KS passbands. Two independent sources of bias in the photometric zero-points are identified: First, high sky backgrounds severely affect the H-band measurements, but this can mostly be minimized by strict

  • Optimized cutting off transit algorithm to study stellar rotation from PLATO mission light curves
    Exp. Astron. (IF 1.489) Pub Date : 2020-06-16
    Leandro de Almeida; Francys Anthony; Ana Carolina Mattiuci; Matthieu Castro; Jefferson Soares da Costa; Réza Samadi; José Dias do Nascimento

    Measuring the stellar rotation of one of the components in eclipsing binaries (EBs) or planetary systems is a challenge task. The difficulty is mainly due to the complexity of analyzing, in the same light curve, the signal from the stellar rotation mixed with the transit signal of a stellar or substellar companion, like a brown dwarf or planet. There are many methods to correct the long-term trend

  • Estimating, monitoring and minimizing the travel footprint associated with the development of the Athena X-ray Integral Field Unit: An on-line travel footprint calculator released to the science community.
    Exp. Astron. (IF 1.489) Pub Date : 2020-06-14
    Didier Barret

    Global warming imposes us to reflect on the way we carry research, embarking on the obligation to minimize the environmental impact of our research programs, with the reduction of our travel footprint being one of the easiest actions to implement, thanks to the advance of digital technology. The X-ray Integral Field Unit (X-IFU), the cryogenic spectrometer of the Athena space X-ray observatory of the

  • Optical design of the multi-wavelength imaging coronagraph Metis for the solar orbiter mission
    Exp. Astron. (IF 1.489) Pub Date : 2020-05-20
    S. Fineschi; G. Naletto; M. Romoli; V. Da Deppo; E. Antonucci; D. Moses; A.M. Malvezzi; G. Nicolini; D. Spadaro; L. Teriaca; V. Andretta; G. Capobianco; G. Crescenzio; M. Focardi; F. Frassetto; F. Landini; G. Massone; R. Melich; P. Nicolosi; M. Pancrazzi; M.G. Pelizzo; L. Poletto; U. Schühle; M. Uslenghi; S. Vives; S.K. Solanki; P. Heinzel; A. Berlicki; S. Cesare; D. Morea; S. Mottini; P. Sandri; A

    This paper describes the innovative optical design of the Metis coronagraph for the Solar Orbiter ESA-NASA mission. Metis is a multi-wavelength, externally occulted telescope for the imaging of the solar corona in both the visible and ultraviolet wavelength ranges. Metis adopts a novel occultation scheme for the solar disk, that we named “inverse external occulter”, for reducing the extremely high

  • Methods for detection and analysis of weak radio sources with single-dish radio telescopes
    Exp. Astron. (IF 1.489) Pub Date : 2020-05-20
    M. Marongiu; A. Pellizzoni; E. Egron; T. Laskar; M. Giroletti; S. Loru; A. Melis; G. Carboni; C. Guidorzi; S. Kobayashi; N. Jordana-Mitjans; A. Rossi; C. G. Mundell; R. Concu; R. Martone; L. Nicastro

    The detection of mJy/sub-mJy point sources is a significant challenge for single-dish radio telescopes. Detection or upper limits on the faint afterglow from GRBs or other sources at cosmological distances are important means of constraining the source modeling. Using the Sardinia Radio Telescope (SRT), we compare the sensitivity and robustness of three methods applied to the detection of faint radio

  • Measurement of azimuthal dependent muon flux by 2 m × 2 m RPC stack at IICHEP-Madurai
    Exp. Astron. (IF 1.489) Pub Date : 2020-05-08
    S. Pethuraj; G. Majumder; V. M. Datar; N. K. Mondal; K. C. Ravindran; B. Satyanarayana

    The proposed 50 kton INO-ICAL experiment is an upcoming underground high energy physics experiment planned to be commissioned at Bodi hills near Theni, India *, ** to study various properties of neutrino oscillations using atmospheric neutrinos produced by extensive air shower phenomenon. The resistive plate chamber has been chosen as the active detector element for the proposed INO-ICAL. An experimental

  • Principal component analysis to correct data systematics. Case study: K2 light curves
    Exp. Astron. (IF 1.489) Pub Date : 2020-04-13
    A. Petralia; G. Micela

    Instrumental data are affected by systematic effects that dominate the errors and can be relevant when searching for small signals. This is the case of the K2 mission, a follow up of the Kepler mission, that, after a failure on two reaction wheels, has lost its stability properties rising strongly the systematics in the light curves and reducing its photometric precision. In this work, we have developed

  • Soft proton scattering at grazing incidence from X-ray mirrors: analysis of experimental data in the framework of the non-elastic approximation
    Exp. Astron. (IF 1.489) Pub Date : 2020-04-04
    Roberta Amato; Teresa Mineo; Antonino D’Aì; Sebastian Diebold; Valentina Fioretti; Alejandro Guzman; Simone Lotti; Claudio Macculi; Silvano Molendi; Emanuele Perinati; Chris Tenzer; Andrea Santangelo

    Astronomical X-ray observatories with grazing incidence optics face the problem of pseudo-focusing of low energy protons from the mirrors towards the focal plane. Those protons constitute a variable, unpredictable component of the non X-ray background that strongly affects astronomical observations and a correct estimation of their flux at the focal plane is then essential. For this reason, we investigate

  • Simulation of atmospheric pressure dependence on GRAPES-3 particle density
    Exp. Astron. (IF 1.489) Pub Date : 2020-03-04
    M. Zuberi; S. Ahmad; M. Chakraborty; A. Chandra; S. R. Dugad; S. K. Gupta; B. Hariharan; Y. Hayashi; P. Jagadeesan; A. Jain; P. Jain; V. B. Jhansi; S. Kawakami; S. Mahapatra; P. K. Mohanty; S. D. Morris; P. K. Nayak; A. Oshima; D. Pattanaik; P. S. Rakshe; K. Ramesh; B. S. Rao; L. V. Reddy; F. Varsi

    The high density extensive air shower array along with large area (560 m2) muon telescope of GRAPES-3 at Ooty is used to make precise measurements of cosmic ray properties by using the secondaries produced through cascades in the Earth’s atmosphere. The observed particle density at detector level is affected by atmospheric effects primarily due to variations in the pressure and temperature. Here, an

  • Algorithm for calculating anastigmatic three-mirror telescopes
    Exp. Astron. (IF 1.489) Pub Date : 2020-03-04
    V. Yu. Terebizh

    A simple algorithm for calculating three-mirror telescopes with all conic surfaces free of spherical aberration, coma, astigmatism, and field curvature is proposed. The algorithm is based on the theory of aberrations of the third order. The initial parameters are the effective focal length, mirror diameters, and system length. The result is a design with a flat field of view with a diameter of more

  • Stellar masks and bisector’s shape for M-type stars observed in the GAPS programme with HARPS-N at TNG
    Exp. Astron. (IF 1.489) Pub Date : 2020-03-02
    Monica Rainer; Francesco Borsa; Laura Affer

    The HARPS/HARPS-N Data Reduction Software (DRS) relies on the cross-correlation between the observed spectra and a suitable stellar mask to compute a cross-correlation function (CCF) to be used both for the radial velocity (RV) computation and as an indicator of stellar lines asymmetry, induced for example by the stellar activity. Unfortunately the M2 mask currently used by the HARPS/HARPS-N DRS for

  • A method of ground target positioning by observing radio pulsars
    Exp. Astron. (IF 1.489) Pub Date : 2020-02-29
    Wei Han; Jingbo Wang; Na Wang; Gaowen Sun; Dalin He

    We use radio millisecond pulsars (MSPs) to determine the position of the Parkes telescope to explore the feasibility of pulsar navigation for terrestrial application, as well to investigate the relations between pulsar observations and the positional errors for potential X-ray pulsar navigation (XNAV). Different from the analytical algorithm (Han et al. Astrophys. Space Sci. 364, 3, 2018) which derives

  • SURA: Semnan University Radio Array
    Exp. Astron. (IF 1.489) Pub Date : 2020-02-18
    G. Rastegarzadeh; M. Sabouhi

    The first phase of the Semnan University Radio Array has started its operation. As the first radio experiment in the Middle East which aims to investigate the radio signal properties of cosmic rays, SURA presently consists of 5 radio stations including 4 log periodic and one Inverted-V dipole antennas. In its current format, the experiment acts as a self-trigger radio array. SURA operates in the relatively

  • Induced X-ray fluorescence background for high-voltage space based detectors
    Exp. Astron. (IF 1.489) Pub Date : 2020-01-11
    T. Rogers; R. McEntaffer; J. McCoy; D. M. Miles; T. Schultz; J. Tutt

    A sounding rocket utilizing Gaseous Electron Multiplier detectors experienced a strong source of unexpected signal during flight which prevented the acquisition of usable science data. We find that the flight data is well-matched with a simple fluorescence model corresponding to K- and L-emission lines of the materials present inside the payload. Illuminating the payload with a laboratory electron

  • Inflight performance of the PILOT balloon-borne experiment
    Exp. Astron. (IF 1.489) Pub Date : 2019-12-27
    A. Mangilli; G. Foënard; J. Aumont; A. Hughes; B. Mot; J-Ph. Bernard; A. Lacourt; I. Ristorcelli; L. Montier; Y. Longval; P. Ade; Y. André; L. Bautista; P. deBernardis; O. Boulade; F. Bousqet; M. Bouzit; N. Bray; V. Buttice; M. Charra; M. Chaigneau; B. Crane; E. Doumayrou; J. P. Dubois; X. Dupac; C. Engel; P. Etcheto; Ph. Gelot; M. Griffin; S. Grabarnik; P. Hargrave; Y. Lepennec; R. Laureijs; B. Leriche;

    The Polarized Instrument for Long-wavelength Observation of the Tenuous interstellar medium (PILOT) is a balloon-borne experiment that aims to measure the polarized emission of thermal dust at a wavelength of 240 µm (1.2 THz). A first PILOT flight of the experiment took place from Timmins, Ontario, Canada, in September 2015 and a second flight took place from Alice Springs, Australia in April 2017

  • The AGILE Gamma-Ray observatory: software and pipelines
    Exp. Astron. (IF 1.489) Pub Date : 2019-12-18
    Andrea Bulgarelli

    In this paper is described the approach used to develop the software system of the AGILE γ-ray Observatory, from the definition phase to construction, verification and calibration activities of the satellite, until operations for scientific observations. Flexible software architectures, effective software management workflow, new algorithms (from payload simulators to reconstruction algorithms, from

  • An artificial intelligence based approach for constraining the redshift of blazars using γ –ray observations
    Exp. Astron. (IF 1.489) Pub Date : 2019-12-05
    K. K. Singh; V. K. Dhar; P. J. Meintjes

    In this paper, we discuss an artificial intelligence based approach to constrain the redshift of blazars using combined γ–ray observations from the Fermi Large Area Telescope (LAT) and ground based atmospheric Cherenkov telescopes (ACTs) in GeV and sub TeV energy regimes respectively. The spectral measurements in GeV and TeV energy bands show a redshift dependent spectral break in the γ–ray spectra

  • On-ground calibration of the ART-XC/SRG mirror system and detector unit at IKI. Part III
    Exp. Astron. (IF 1.489) Pub Date : 2019-12-02
    M. Pavlinsky; A. Tkachenko; V. Levin; A. Krivchenko; A. Rotin; M. Kuznetsova; I. Lapshov; R. Krivonos; A. Semena; N. Semena; D. Serbinov; A. Shtykovsky; A. Yaskovich; V. Oleinikov; A. Glushenko; I. Mereminskiy; S. Molkov; S. Sazonov; V. Arefiev

    We have performed tests of the SRG project’s ART-XC telescope’s flight spare units of the mirror system (MS) and the URD focal plane X-ray detector. During the tests, the MS was illuminated by a quasi-parallel X-ray beam from a microfocus tube. By changing the angle between the MS optical axis and the incoming beam we obtained data on vignetting of the effective area of the MS–URD pair at the energies

  • Performance of the EUSO-Balloon optics
    Exp. Astron. (IF 1.489) Pub Date : 2019-12-02
    A. Díaz Damian; C. Catalano; P. Von Ballmoos; N. Sakaki; Y. Takizawa; C. Smith; G. Durando; B. Bouvet

    EUSO-Balloon is the first balloon pathfinder of the JEM-EUSO (Joint Experiment Missions - Extreme Universe Space Observatory) framework. It is an ultraviolet (UV) telescope designed to test the key technologies and methods necessary for the indirect detection of Ultra High Energy Cosmic Rays (UHECR) by observing from above the fluorescence emission produced by Extensive Air Showers (EAS) in the 290-430

  • Simulations of the SVOM/ECLAIRs dynamic background: a fast, accurate and general approach for wide-field hard X-ray instruments
    Exp. Astron. (IF 1.489) Pub Date : 2019-11-23
    Sujay Mate; Laurent Bouchet; Jean-Luc Atteia; Arnaud Claret; Bertrand Cordier; Nicolas Dagoneau; Olivier Godet; Aleksandra Gros; Stéphane Schanne; Henri Triou

    The Space Variable Object Monitor (SVOM) is a forthcoming Chinese - French astrophysics space mission dedicated to the study of Gamma-ray bursts and high-energy transients. ECLAIRs, a wide-field hard X-ray coded mask imager, is the leading instrument for the transient detection and their first localisation. The sensitivity of such instruments is usually limited by the background, either of instrumental

  • TARdYS: Design and prototype of an exoplanet hunter for TAO using a R6 Echelle grating
    Exp. Astron. (IF 1.489) Pub Date : 2019-11-21
    S. Rukdee; L. Vanzi; C. Schwab; M. Flores; A. Valenzuela; J. Pember; A. Zapata; K. Motohara; Y. Yoshii; M. Tala Pinto

    One limitation in characterizing exoplanet candidates is the availability of infrared, high-resolution spectrographs. An important factor in the scarcity of high precision IR spectrographs is the high cost of these instruments. We present a new optical design, which leads to a cost-effective solution. Our instrument is a high-resolution (R = 60,000) infrared spectrograph with a R6 Echelle grating and

  • 125 - 211 GHz low noise MMIC amplifier design for radio astronomy
    Exp. Astron. (IF 1.489) Pub Date : 2019-08-31
    Daniel White; William McGenn; Danielle George; Gary A. Fuller; Kieran Cleary; Anthony Readhead; Richard Lai; Gerry Mei

    To achieve the low noise and wide bandwidth required for millimeter wavelength astronomy applications, superconductor-insulator-superconductor (SIS) mixer based receiver systems have typically been used. This paper investigates the performance of high electron mobility transistor (HEMT) based low noise amplifiers (LNAs) as an alternative approach for systems operating in the 125 — 211 GHz frequency

  • TAROT Reunion a telescope based on the Rapido design for reliable optical observations of fast transients
    Exp. Astron. (IF 1.489) Pub Date : 2019-08-27
    Alain Klotz; Pierre Thierry

    Rapido is a robotic telescope designed to be duplicated in order to build a network that answers specific requirements of fast transients. The challenge of Rapido is to be a low cost, very fast pointing telescope, with high reliability and a little maintenance cost. Mechanics is based on a coil winding winch. Optics and electronics are commercials. Mount of Rapido is home made and is described in details

  • Modeling of rigidity dependent CORSIKA simulations for GRAPES-3
    Exp. Astron. (IF 1.489) Pub Date : 2019-08-16
    B. Hariharan; S. R. Dugad; S. K. Gupta; Y. Hayashi; S. S. R. Inbanathan; P. Jagadeesan; A. Jain; S. Kawakami; P. K. Mohanty; B. S. Rao

    The GRAPES-3 muon telescope located in Ooty, India records 4 × 109 muons daily. These muons are produced by interaction of primary cosmic rays (PCRs) in the atmosphere. The high statistics of muons enables GRAPES-3 to make precise measurement of various sun-induced phenomenon including coronal mass ejections (CME), Forbush decreases, geomagnetic storms (GMS) and atmosphere acceleration during the overhead

  • GRID: a student project to monitor the transient gamma-ray sky in the multi-messenger astronomy era
    Exp. Astron. (IF 1.489) Pub Date : 2019-08-08
    Jiaxing Wen; Xiangyun Long; Xutao Zheng; Yu An; Zhengyang Cai; Jirong Cang; Yuepeng Che; Changyu Chen; Liangjun Chen; Qianjun Chen; Ziyun Chen; Yingjie Cheng; Litao Deng; Wei Deng; Wenqing Ding; Hangci Du; Lian Duan; Quan Gan; Tai Gao; Zhiying Gao; Wenbin Han; Yiying Han; Xinbo He; Xinhao He; Long Hou; Fan Hu; Junling Hu; Bo Huang; Dongyang Huang; Xuefeng Huang; Shihai Jia; Yuchen Jiang; Yifei Jin;

    The Gamma-Ray Integrated Detectors (GRID) is a space mission concept dedicated to monitoring the transient gamma-ray sky in the energy range from 10 keV to 2 MeV using scintillation detectors onboard CubeSats in low Earth orbits. The primary targets of GRID are the gamma-ray bursts (GRBs) in the local universe. The scientific goal of GRID is, in synergy with ground-based gravitational wave (GW) detectors

  • Future gamma-ray missions’ polarimetric prospects
    Exp. Astron. (IF 1.489) Pub Date : 2019-08-03
    A. F. V. Cortez; R. M. Curado da Silva; G. Rodriguez; P. Cumani; A. Morselli; M. Hernanz; V. Tatischeff; M. Moita; J. M. Maia; P. Von Ballmoos; A. Zoglauer

    High-energy astrophysics polarimetry may significantly benefit from e-ASTROGAM and from AMEGO mission proposals, since to date limited polarimetric measurements were performed in this domain, exclusively under 1 MeV. The polarimetric potential of both missions was analyzed in the Compton regime by Monte Carlo mass model simulations with MEGAlib toolkit. The performance of e-ASTROGAM was analyzed by

  • An automated approach for photometer and dust mass calculation of the Crab nebula
    Exp. Astron. (IF 1.489) Pub Date : 2019-07-30
    Cyrine Nehmé; Sarkis Kassounian; Marc Sauvage

    Ample evidence exists regarding supernovae being a major contributor to interstellar dust. In this work, the deepest far-infrared observations of the Crab Nebula are used to revisit the estimation of the dust mass present in this supernova remnant. Images in filters between 70 and 500 μ m taken by the PACS and SPIRE instruments on-board of the Herschel Space Observatory are used. With a novel and automated

  • Improvement of the pointing precision of the Tianma radio telescope with an inclinometer measurement system
    Exp. Astron. (IF 1.489) Pub Date : 2019-07-25
    Li Fu; Jinqing Wang; Yongbin Jiang; Linfeng Yu; Rongbing Zhao; Quanbao Ling; Bingen Yang; Qinghui Liu; Zhiqiang Shen

    To assure high pointing precision of the Tianma radio telescope (TMRT), new models based on a inclinometer measurement system are added to the classical pointing model. This involves four main tasks. Firstly, the inclinometer measurement system is set up and its precision is evaluated. Secondly, a feedback control strategy for pointing error for the turbulences of uneven azimuth track and thermal deformations

  • A robotic pipeline for fast GRB followup with the Las Cumbrés observatory network
    Exp. Astron. (IF 1.489) Pub Date : 2019-07-11
    R. Martone; C. Guidorzi; C. G. Mundell; S. Kobayashi; A. Cucchiara; A. Gomboc; N. Jordana; T. Laskar; M. Marongiu; D. C. Morris; R. J. Smith; I. A. Steele

    In the era of multi-messenger astronomy the exploration of the early emission from transients is key for understanding the encoded physics. At the same time, current generation networks of fully-robotic telescopes provide new opportunities in terms of fast followup and sky coverage. This work describes our pipeline designed for robotic optical followup of gamma-ray bursts with the Las Cumbrés Observatory

  • Implementation of MUAV as reference source for GLAO systems
    Exp. Astron. (IF 1.489) Pub Date : 2019-07-05
    Raúl Rodríguez García; Salvador Cuevas

    We propose an alternative method to generate an artificial reference source for a Ground Layer Adaptive Optics system airborne on a Multirotor Unmanned Aerial Vehicle. Turbulence profiles from the Ground Layer at the National Astronomical Observatory in San Pedro Martir were analyzed to establish the requirements in luminosity, altitude, and flight stability of an artificial source. We found the source

  • Astronomical data fusion: recent progress and future prospects — a survey
    Exp. Astron. (IF 1.489) Pub Date : 2019-06-25
    Ce Yu; Bingyao Li; Jian Xiao; Chao Sun; Shanjiang Tang; Chongke Bi; Chenzhou Cui; Dongwei Fan

    Over the past year, the discovery of the first electromagnetic counterparts to sources of gravitational waves and high-energy neutrinos has brought us to the new era of ”multi-messenger” astrophysics (MMA). These new events provide deep insights into astrophysics, meanwhile, lead to the development of astronomical data fusion techniques. Each messenger carries information from different observation

  • Detection of Crab radiation with a meteorological balloon borne phoswich detector
    Exp. Astron. (IF 1.489) Pub Date : 2019-06-19
    Ritabrata Sarkar; Sandip K. Chakrabarti; Debashis Bhowmick; Arnab Bhattacharya; Abhijit Roy

    We use existing light weight balloon facility of Indian Centre for Space Physics to detect the X-ray radiation from Crab pulsar with a phoswich detector. We present the design considerations and characterization of the detector used for this purpose. We model the background radiation in the detector environment at various altitudes and use this in spectral analysis. The background radiation level and

  • New optimized ASIC multiplier in 28 nm CMOS for processing the X-part of FX correlator in radio interferometry
    Exp. Astron. (IF 1.489) Pub Date : 2019-05-29
    Vignesh Raja Balu; S. M. Rezaul Hasan

    The choice of multiplier and accumulation unit determines the performance of digital signal processors, particularly in Big-Data correlators employed in radio interferometers. This work is targeted towards reducing the multiplier-size and delay in order to achieve low-power and compact-area for interferometer correlators such as in SKA and VLBI. For this purpose different fast and hardware efficient

  • A hybrid SDR-GPU receiver for a low-frequency array in radio astronomy
    Exp. Astron. (IF 1.489) Pub Date : 2019-05-10
    Nitish Ragoomundun; Girish Kumar Beeharry

    The Mauritius Deuterium Telescope (MDT) is an upcoming low-frequency array being built in Mauritius to observe the Deuterium hyperfine line at 327.4 MHz. This project is an opportunity to develop new techniques in radio astronomy considering the advent of the Square Kilometre Array in a few years time. The design of the MDT array targets a low-cost hybrid system consisting of Software Defined Radios

  • Environmental characterisation and stabilisation of a 2×200-meter outdoor fibre interferometer at the CHARA Array
    Exp. Astron. (IF 1.489) Pub Date : 2019-05-01
    Lucien Lehmann; Laurent Delage; Ludovic Grossard; Francois Reynaud; Steve Golden; Craig Woods; Larry Webster; Judit Sturmann; Theo ten Brummelaar

    In the framework of the ALOHA project (Astronomical Light Optical Hybrid Analysis), devoted to high resolution imaging in the L band, we investigate in this paper the possibility to deploy fibre links between the telescopes of the CHARA Array. As a first step, we set up an outdoor hectometric fibre interferometer to measure the vibration environment at the Mount Wilson Observatory. The optical path

  • Designing large pixelated CdTe detection planes for hard X-ray transients detection
    Exp. Astron. (IF 1.489) Pub Date : 2019-04-10
    Karine Lacombe; Carine Amoros; Jean-Luc Atteia; Armelle Bajat; Laurent Bouchet; Jean-Pascal Dezalay; Philippe Guillemot; Baptiste Houret; François Lebrun; Sujay Mate; Roger Pons; Henri Triou; Vincent Waegebaert

    In this paper, we discuss the need for very large detection planes for the detection of hard X-ray transients in the multi-messenger era, started with the quasi-simultaneous detection of GRB 170817A by Fermi/GBM and INTEGRAL/SPI and the gravitational waves event GW 170817, detected by the LVC collaboration. After pointing that current and future instruments gain in the number of GRBs thanks to their

  • PolarLight: a CubeSat X-ray polarimeter based on the gas pixel detector
    Exp. Astron. (IF 1.489) Pub Date : 2019-03-28
    Hua Feng; Weichun Jiang; Massimo Minuti; Qiong Wu; Aera Jung; Dongxin Yang; Saverio Citraro; Hikmat Nasimi; Jiandong Yu; Ge Jin; Jiahui Huang; Ming Zeng; Peng An; Luca Baldini; Ronaldo Bellazzini; Alessandro Brez; Luca Latronico; Carmelo Sgrò; Gloria Spandre; Michele Pinchera; Fabio Muleri; Paolo Soffitta; Enrico Costa

    The gas pixel detector (GPD) is designed and developed for high-sensitivity astronomical X-ray polarimetry, which is a new window about to open in a few years. Due to the small mass, low power, and compact geometry of the GPD, we propose a CubeSat mission Polarimeter Light (PolarLight) to demonstrate and test the technology directly in space. There is no optics but a collimator to constrain the field

  • The soft X-ray spectrometer polarimeter SolpeX
    Exp. Astron. (IF 1.489) Pub Date : 2019-03-16
    J. Sylwester; M. Stȩślicki; J. Bąkała; S. Płocieniak; Ż. Szaforz; M. Kowaliński; D. Ścisłowski; P. Podgórski; T. Mrozek; J. Barylak; A. Makowski; M. Siarkowski; Z. Kordylewski; B. Sylwester; S. Kuzin; A. Kirichenko; A. Pertsov; S. Bogachev

    We present a novel X-ray assembly of functionally related instrument blocks intended to measure solar flare and active region (AR) spectra from within the Russian instrument complex KORTES, to be mounted aboard the International Space Station (ISS). SolpeX consists of three blocks: fast-rotating multiple flat crystal Bragg spectrometer, pin-hole X-ray spectral imager and Bragg polarimeter. This combination

  • Background for a gamma-ray satellite on a low-Earth orbit
    Exp. Astron. (IF 1.489) Pub Date : 2019-03-08
    P. Cumani; M. Hernanz; J. Kiener; V. Tatischeff; A. Zoglauer

    The different background components in a low-Earth orbit have been modeled in the 10 keV to 100 GeV energy range. The model is based on data from previous instruments and it considers both primary and secondary particles, charged particles, neutrons and photons. The necessary corrections to consider the geomagnetic cutoff are applied to calculate the flux at different inclinations and altitudes for

  • VHE gamma-ray observation of Crab Nebula with HAGAR telescope array
    Exp. Astron. (IF 1.489) Pub Date : 2019-03-01
    B. B. Singh; R. J. Britto; V. R. Chitnis; A. Shukla; L. Saha; A. Sinha; B. S. Acharya; P. R. Vishwanath; G. C. Anupama; P. Bhattacharjee; K. S. Gothe; B. K. Nagesh; T. P. Prabhu; S. K. Rao; R. Srinivasan; S. S. Upadhya

    HAGAR is a system of seven Non-imaging Atmospheric Cherenkov Telescopes located at Hanle in the Ladakh region of the Indian Himalayas at an altitude of 4270 meters amsl. Since 2008, we have observed the Crab Nebula to assess the performance of the HAGAR telescopes. We describe the analysis technique for the estimation of γ-ray signal amidst cosmic ray background. The consolidated results spanning nine

  • Effective collecting area of lobster eye optics and optimal value of effective angle
    Exp. Astron. (IF 1.489) Pub Date : 2019-02-14
    V. Tichý; M. Barbera; R. Hudec; R. Willingale

    Effective collecting area represents one of principal parameters of optical systems. The common requirement is to obtain as large effective collecting area as it is possible. The paper presents an analytical method of calculating effective collecting length and its maximization for lobster eye optics. The results are applicable for a Schmidt as well as for an Angel lobster eye geometry used in an astronomical

  • Iranian national observatory project: seeing measurements at mount Gargash
    Exp. Astron. (IF 1.489) Pub Date : 2019-02-12
    Arash Danesh; Habib G. Khosroshahi; Behnam Javanmardi; Alireza Molaeinezhad; Yousefali Abedini; Hamed Altafi; Mahyar Taghavinamin; Sohrab Sheikhani

    The site selection for the Iranian National Observatory (INO) was concluded in 2007. As a result of a 7-year campaign, Mount Gargash was identified to host the INO observing facilities. To measure the atmospheric seeing, an Automated Differential Image Motion Monitoring (automatic DIMM) system has been installed few 100 meters to the mainpeak. Together with a weather station, this automatic DIMM system

  • Machine learning on compton event identification for a nano-satellite mission
    Exp. Astron. (IF 1.489) Pub Date : 2019-01-25
    Haitao Cao; Denis Bastieri; Riccardo Rando; Giorgio Urso; Gaoyong Luo; Alessandro Paccagnella

    Nano-satellite MeV telescope is becoming attractive nowadays. The dominant interaction mechanism of the electromagnetic spectrum around 1MeV is Compton scattering. However, the gamma-rays generated by primary particles hitting the atmosphere and the pair production events are the two significant background events when the satellite is operating in Low Earth Orbit. In this paper, we applied Machine

  • In-flight measurement of Planck telescope emissivity
    Exp. Astron. (IF 1.489) Pub Date : 2018-12-18
    F. Cuttaia; L. Terenzi; G. Morgante; M. Sandri; F. Villa; A. De Rosa; E. Franceschi; M. Frailis; S. Galeotta; A. Gregorio; P. Delannoy; S. Foley; B. Gandolfo; A. Neto; C. Watson; F. Pajot; M. Bersanelli; R. C. Butler; N. Mandolesi; A. Mennella; J. Tauber; A. Zacchei

    The Planck satellite in orbit mission ended in October 2013. Between the end of Low Frequency Instrument (LFI) routine mission operations and the satellite decommissioning, a dedicated test was also performed to measure the Planck telescope emissivity. The scope of the test was twofold: i) to provide, for the first time in flight, a direct measure of the telescope emissivity; and ii) to evaluate the

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