Albert van Duin

Ambient L-band receiver for high-cadence monitoring of fast radio bursts at Westerbork

Mark Ruiter, Paulus Kruger, Jason Hessels, Geert Vastenhoud et autres

To pioneer enabling technologies in radio astronomy and to perform high-cadence monitoring of repeating fast radio burst (FRB) sources, a novel L-band receiver for the Westerbork Synthesis Radio Telescope (WSRT) is currently being developed and tested.This uncooled receiver outperforms the previous-generation, cryogenically …

nl, sk (code pays fourni par la source)

Architecture Design and Ground Performance of Netherlands‐China Low‐Frequency Explorer

Sukanth Karapakula, Christiaan D. Brinkerink, A. Vecchio, Hamid Reza Pourshaghaghi et autres

Abstract The Netherlands‐China Low‐Frequency Explorer (NCLE) (Boonstra et al., 2017, https://www.ursi.org/proceedings/procGA17/papers/Paper_J19‐2(1603).pdf ; Chen et al., 2020, https://ui.adsabs.harvard.edu/abs/2020AAS…23610203C/abstract ) is a radio instrument for astrophysical studies in the low‐frequency range (80 kHz–80 MHz). As a technology demonstrator, NCLE shall inform the design of …

nl, fr, cn (code pays fourni par la source)

MATISSE, the VLTI mid-infrared imaging spectro-interferometer

B. López, S. Lagarde, R. Petrov, W. Jaffe et autres

Context. Optical interferometry is at a key development stage. The Very Large Telescope Interferometer (VLTI) has established a stable, robust infrastructure for long-baseline interferometry that is usable by general astronomical observers. The present second-generation instruments offer a wide wavelength coverage and improved …

fr, nl, de, cl, hu, us, pl, at (code pays fourni par la source)

MATISSE, the VLTI mid-infrared imaging spectro-interferometer

R. Petrov, Fatmé Allouche, P. Berio, A. Matter et autres

Context:Optical interferometry is at a key development stage. ESO's VLTI has established a stable, robust infrastructure for long-baseline interferometry for general astronomical observers. The present second-generation instruments offer a wide wavelength coverage and improved performance. Their sensitivity and measurement accuracy lead to …

Mid-infrared circumstellar emission of the long-period Cepheid l Carinae resolved with VLTI/MATISSE

V. Hocdé, N. Nardetto, A. Matter, A. Mérand et autres

The nature of circumstellar envelopes (CSE) around Cepheids is still a matter of debate. The physical origin of their infrared (IR) excess could be either a shell of ionized gas, or a dust envelope, or both. This study aims at constraining the …

fr, de, nl, cl, pl, hu, us, at (code pays fourni par la source)

The asymmetric inner disk of the Herbig Ae star HD 163296 in the eyes of VLTI/MATISSE: evidence for a vortex?

J. Varga, M. R. Hogerheijde, Roy van Boekel, L. Klarmann et autres

Context. A complex environment exists in the inner few astronomical units of planet-forming disks. High-angular-resolution observations play a key role in our understanding of the disk structure and the dynamical processes at work. Aims. In this study we aim to characterize the …

nl, hu, de, fr, cl, us, pl, at (code pays fourni par la source)

SPHERE / ZIMPOL high resolution polarimetric imager. I. System overview, PSF parameters, coronagraphy, and polarimetry

Hans Martin Schmid, R. Roelfsema, J. Milli, F. Ménard et autres

We describe the Zurich Imaging Polarimeter (ZIMPOL), the visual focal plane subsystem of the SPHERE "VLT planet finder", which pushes the limits of current AO systems to shorter wavelengths, higher spatial resolution, and much improved polarimetric performance. We provide new benchmarks for …

ch, nl, fr, de, it, cl (code pays fourni par la source)

SPHERE/ZIMPOL high resolution polarimetric imager

Hans Martin Schmid, A. Bazzon, R. Roelfsema, D. Mouillet et autres

Context. The SPHERE “planet finder” is an extreme adaptive optics (AO) instrument for high resolution and high contrast observations at the Very Large Telescope (VLT). We describe the Zurich Imaging Polarimeter (ZIMPOL), the visual focal plane subsystem of SPHERE, which pushes the …

ch, nl, fr, cl, de, it (code pays fourni par la source)

An overview of the mid-infrared spectro-interferometer MATISSE: science, concept, and current status

A. Matter, B. López, Michael Lehmitz, Felix C. M. Bettonvil et autres

MATISSE is the second-generation mid-infrared spectrograph and imager for the Very Large Telescope Interferometer (VLTI) at Paranal. This new interferometric instrument will allow significant advances by opening new avenues in various fundamental research fields: studying the planet-forming region of disks around young …

fr, de, nl, us, hu (code pays fourni par la source)

Calibrating high-precision Faraday rotation measurements for LOFAR and the next generation of low-frequency radio telescopes (Corrigendum)

Carlos Sotomayor-Beltran, C. Sobey, Jason W. T. Hessels, Gianni De Bruyn et autres

This erratum corrects Figs. 2 and 3 of our original paper (Sotomayor-Beltran et al. 2013).Due to a simple error in plotting the input data, these maps of ionospheric total electron content (TEC) were inverted north-south and improperly stretched to match the underlying …

de, nl, us, fr, au, gb, ru (code pays fourni par la source)

LOFAR discovery of a quiet emission mode in PSR B0823+26

C. Sobey, Neil J. Young, Jason W. T. Hessels, P. Weltevrede et autres

PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomena over time-scales of seconds to (at least) hours, including nulling, subpulse drifting, and mode-changing. Studying pulsars like PSR B0823+26 provides further insight into the relationship between these various emission phenomena …

de, nl, Afrique du Sud, gb, ru, au, fr, us, in, fi (code pays fourni par la source)

LOFAR discovery of a quiet emission mode in PSR B0823+26

C. Sobey, Neil J. Young, Jason W. T. Hessels, P. Weltevrede et autres

PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomena over timescales of seconds to (at least) hours, including nulling, subpulse drifting, and mode-changing. Studying pulsars like PSR B0823+26 provides further insight into the relationship between these various emission phenomena …

de, us, nl, gb, au, fr, Afrique du Sud, fi (code pays fourni par la source)