Fredrick Jenet

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Andrej Dujella

University of Zagreb

Hemin Koyi

Uppsala University

Jana Javornik

University of East London

Graham Martin

University of Leicester

Gwen Robbins Schug

University of North Carolina at Greensboro

Gabriel Gutierrez-Alonso

University of Salamanca

John Sutton

Macquarie University

Eros Carvalho

Universidade Federal do Rio Grande do Sul

Kevin Arbuckle

Swansea University

Jesper Hoffmeyer

University of Copenhagen

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Papers by Fredrick Jenet

Binary Super-Massive Black Holes, Gravitational Waves, and Pulsar Timing Arrays

AAS, May 1, 2012

Pulsar timing and gravitational wave detection

Pulsar timing and Gravitational Wave Detection: Building a galactic scale gravitational wave observatory

Bulletin of the American Physical Society, May 2, 2009

We are entering a new stage in astrophysics, the era of gravitational waves. The detection and st... more We are entering a new stage in astrophysics, the era of gravitational waves. The detection and study of such waves will allow us to see the universe in a way never before possible. It turns out that observations of a set of exotic stars known as radio pulsars will enable us to detect and characterize nano-Hz gravitational waves. This talk will give an overview of this detection technique as well as discuss the various astrophysical phenomenon we will be able to study using nano-Hz gravitational waves.

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A Prototype Radio Transient SurveyInstrumentforPiggyback Deep Space Network Tracking This paper describes NASA's Deep Space Network (DSN) as a tool for making radio transient observations; DSN's low-noise large aperture antennas are suitable for surveying transients

High time resolution observations of radio pulsars: The first detection of coherent emission

PhDT, Nov 1, 2001

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A method for calculating lateral surface area of bistatic radar beam overlap

Advances in Space Research

The Arecibo Remote Command Center Program

41st COSPAR Scientific Assembly, Jul 1, 2016

Constraining vacuum gap models of pulsar radio emission using the intensity modulation index

arXiv (Cornell University), Nov 1, 2003

Recent observations suggest that the level of pulse-to-pulse intensity modulation observed in a g... more Recent observations suggest that the level of pulse-to-pulse intensity modulation observed in a given radio pulsar may depend on its period and period derivative. Such a "modulation index relationship" (MIR) may be an important tool for determining the physical processes behind the radio emission. In the context of sparking gap models, the exact functional form of the MIR depends on the physical processes occurring on the surface of the neutron star in the region known as the "vacuum gap." Several possible vacuum gap models are studied here in order to determine the expected MIR for a given model. Current observations are consistent with two of the four models studied: the curvature radiation driven vacuum gap and the curvature radiation driven near threshold vacuum gap (CR-NTVG). It is shown that the inverse Compton scattering driven vacuum gap models are not supported by the current data. Given that the current data best supports the CR-NTVG model, its possible that all pulsars have strong (≈ 10 13 G) surface magnetic fields.

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Current Status of The Low Frequency All Sky Monitor

American Astronomical Society Meeting Abstracts #231, 2018

Detection Methods for Continuous Gravitational Waves using Pulsar Timing Data

AAS, 2012

The Arecibo Observatory as an Instrument for Investigating Orbital Debris: Legacy and Next Generation Performance

The Planetary Science Journal, 2022

In this paper, we investigate the ability of the Arecibo Observatory to characterize the orbital ... more In this paper, we investigate the ability of the Arecibo Observatory to characterize the orbital debris environment and compare it to the primary instrument used by NASA’s Orbital Debris Program Office, the Haystack Ultra-Wideband Satellite Imaging Radar (HUSIR). Arecibo’s location (18.°3 N) increases the percentage of observable orbits (relative to HUSIR) by 27%, which gives Arecibo access to a much larger and previously unmeasured portion of the environment. Due to the recent collapse of the Arecibo dish, in addition to exploring historic capabilities of the Legacy Arecibo Telescope, estimates of the performance of the proposed Next Generation Arecibo Telescope (NGAT) are explored. We show that the current NGAT design could have a sensitivity comparable to the Goldstone Orbital Debris Radar, currently NASA’s most sensitive orbital debris radar. Additionally, design suggestions are presented that would significantly improve the capabilities of the NGAT for orbital debris investigat...

High time resolution observations of radio pulsars : the first detection of coherent emission

Recent advances in recording technology and computational power have made possible the developmen... more Recent advances in recording technology and computational power have made possible the development of a wide bandwidth digital recording system for radio astronomy. A prototype 50 MHz bandwidth system along with two production systems with 10-50 MHz bandwidth have been designed and built at Caltech. Signal processing techniques have been developed in order to remove various artifacts introduced into the signal by the digitization process. These techniques along with various pulsar signal processing algorithms have been successfully implemented in a suite of highly portable analysis programs designed to run on multi-purpose parallel supercomputers, networked workstations, and stand-alone workstations. The single pulse radio emission properties of the bright millisecond pulsar PSR J0437-4715 have been studied using standard analysis methods. New techniques have been developed in order to study the single pulse properties of "weak" or low-intensity pulsars. These techniques h...

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First Light for Station V of the Low-Frequency All-Sky Monitor Radio Telescope

2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium), 2020

The Low-Frequency All-Sky Monitor is a radio telescope network consisting of five stations, each ... more The Low-Frequency All-Sky Monitor is a radio telescope network consisting of five stations, each with 13 Long-Wavelength Array (LWA) antennas, distributed around the North American continent. The LWA antennas are arranged so as to form a wide-angle drift scan beam, sensitive to bright radio transients, astrophysical and ionospheric, at 10-88 MHz. The multiple stations can reliably verify astrophysical events by simultaneous detection. Adding the fifth station at Hillsdale College in Hillsdale, MI, provides a wider range of declination coverage for the project. Station V, like the previous four stations, was constructed by undergraduate researchers, who continue to operate and manage the telescope. Here we report on Station V's "first light", and discuss future prospects.

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The Long Wavelength Array (LWA): A Large HF/VHF Array for Solar Physics, Ionospheric Science, and Solar Radar A Ground-Based Instrument Paper for the 2010 NRC Decadal Survey of Solar and Space Physics

and the LWA ConsortiumExecutive Summary The Long Wavelength Array (LWA), currently under construc... more and the LWA ConsortiumExecutive Summary The Long Wavelength Array (LWA), currently under construction in New Mexico, will be an imaging HF/VHF interferometer providing a new approach for studying the Sun-Earth environment from the surface of the sun through the Earth’s ionosphere [1]. The LWA will be a powerful tool for solar physics and space weather investigations, through its ability to characterize a diverse range of lowfrequency, solar-related emissions, thereby increasing our understanding of particle acceleration and shocks in the solar atmosphere along with their impact on the Sun-Earth environment. As a passive receiver the LWA will directly detect Coronal Mass Ejections (CMEs) in emission, and indirectly through the scattering of cosmic background sources. If coupled with a suitable transmitter, the LWA would be an excellent receiver for solar radar, potentially demonstrating accurate geomagnetic storm prediction from the Earth’s surface. Both radar and passive receiving t...

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The Green Bank North Celestial Cap Pulsar Survey: New Pulsars and Future Prospects

Procede de determination de la composition chimique de fluides de reservoirs

L'invention concerne des procedes permettant d'analyser les fluides de formation dans un ... more L'invention concerne des procedes permettant d'analyser les fluides de formation dans un environnement de champ petrolifere par spectroscopie d'absorption a proche infrarouge. Des indications d'absorption a proche infrarouge sont analysees afin de determiner la teneur des composes dans un echantillon de fluide de formation.

Radio Pulse Properties the Millisecond Pulsar PSR J0437-4715 at 20 CM

VizieR Online Data Catalog: Arecibo Pulsar-ALFA (PALFA) survey. IV. (Lazarus+, 2015)

LoFASM: A Low Frequency All Sky Monitor for Radio Transients and Student Training

: The Low-Frequency All-Sky Monitor (LoFASM) is an innovative new radio astronomy observatory. De... more : The Low-Frequency All-Sky Monitor (LoFASM) is an innovative new radio astronomy observatory. Designed and built by faculty and by graduate, undergraduate, and high-school students, it is the first instrument specifically designed for the detection of low-frequency (10 to 88 MHz) astrophysical radio transients. It consists of four geographically-separated stations, each comprising 12 phased array dipole antennas. All four stations have now started taking data. The observatory has also been a vital recruiting and training tool for physics students from the South Texas region. LoFASM was instrumental in establishing the Spacecraft Tracking and Astronomical Research into Gigahertz Astrophysical Transient Emission (STARGATE) project, a public-private partnership between UTB's Center for Advanced Radio Astronomy and SpaceX, focused on RF technology innovation and commercialization. Where this DoD grant funded the deployment and commissioning of LoFASM, an NSF grant has recently been...

NANOGrav and the Astrophysics of Galaxies

Binary Super-Massive Black Holes, Gravitational Waves, and Pulsar Timing Arrays

AAS, May 1, 2012

Pulsar timing and gravitational wave detection

Pulsar timing and Gravitational Wave Detection: Building a galactic scale gravitational wave observatory

Bulletin of the American Physical Society, May 2, 2009

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