Scott Dynes
A5004614868- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Hearing Loss and Rehabilitation
- Antenna Design and Optimization
- Superconducting and THz Device Technology
- Astronomical Observations and Instrumentation
- Electromagnetic Compatibility and Measurements
- Neural dynamics and brain function
- Gyrotron and Vacuum Electronics Research
- Radio Wave Propagation Studies
- Multimedia Communication and Technology
- Mechanical and Optical Resonators
- Particle Accelerators and Free-Electron Lasers
- Pulsed Power Technology Applications
- Microwave Engineering and Waveguides
- Hearing, Cochlea, Tinnitus, Genetics
- Complex Network Analysis Techniques
- Innovative Teaching and Learning Methods
- Neural Networks and Applications
- Neuroscience and Neural Engineering
- Advanced Wireless Communication Techniques
Massachusetts Institute of Technology
1992-2024
University of Manchester
2024
Kavli Institute for Particle Astrophysics and Cosmology
2018
Massachusetts Eye and Ear Infirmary
1992-1999
We report the detection of a transiting Earth-size planet around GJ 357, nearby M2.5 V star, using data from Transiting Exoplanet Survey Satellite (TESS). 357 b (TOI-562.01) is transiting, hot, Earth-sized ( T eq = 525 ± 11 K) with radius R 1.217 0.084 ⊕ and an orbital period P 3.93 d. Precise stellar radial velocities CARMENES PFS, as well archival HIRES, UVES, HARPS also display 3.93-day periodicity, confirming planetary nature leading to mass M 1.84 0.31 . In addition velocity signal for...
Abstract This paper presents the design and deployment of Hydrogen Epoch Reionization Array (HERA) phase II system. HERA is designed as a staged experiment targeting 21 cm emission measurements Reionization. First results from I array are published early 2022, system nearing completion. We describe discuss progress on commissioning future upgrades. As designated Square Kilometre pathfinder instrument, we also show number “case studies” that investigate systematics seen while system, which...
Collaborative Innovation Networks (COINs) are groups of self-motivated individuals from various parts an organization or multiple organizations, empowered by the Internet, who work together on a new idea, driven common vision. In this paper we report first results project that examines innovation networks analyzing e-mail archives some W3C (WWW consortium) working groups. These exhibit ideal characteristics for our purpose, as they form truly global over Internet to develop next generation...
Most models of neural response to electrical stimulation, such as the Hodgkin-Huxley equations, are deterministic, despite significant physiological evidence for existence stochastic activity. For instance, range discharge probabilities measured in single pulses cannot be explained at all by deterministic models. Furthermore, there is growing that component auditory nerve stimulation may fundamental functionally and psychophysical phenomena. In this paper authors present a simple...
Abstract Transiting Exoplanet Survey Satellite ( TESS ) observations have revealed a compact multiplanet system around the sixth-magnitude star HR 858 (TIC 178155732, TOI 396), located 32 pc away. Three planets, each about twice size of Earth, transit this slightly evolved, late F-type star, which is also member visual binary. Two planets may be in mean motion resonance. We analyze observations, using novel methods to model and remove instrumental systematic errors, combine these data with...
The single-pulse model of the companion paper [see ibid., vol. 46, no. 6, p. 617-29, 1999] is extended to describe responses pulse trains by introducing a phenomenological refractory mechanism. Comparisons with physiological data from cat auditory nerve fibers are made for rates between 100 and 800 pulses/s. First, it shown that both shape slope mean discharge rate curves better predicted stochastic than deterministic model. Second, while interpulse effects such as do indeed increase dynamic...
Abstract We report the discovery of TOI-172 b from Transiting Exoplanet Survey Satellite ( TESS ) mission, a massive hot Jupiter transiting slightly evolved G star with 9.48-day orbital period. This is first planet to be confirmed analysis only full frame images, because host was not chosen as two-minute cadence target. From global photometry and follow-up observations carried out by Follow-up Observing Program Working Group, (TIC 29857954) an effective temperature T eff = 5645 ± 50 K, mass...
Warm, large exoplanets with 10-100 day orbital periods pose a major challenge to our understanding of how planetary systems form and evolve. Although high eccentricity tidal migration has been invoked explain their proximity host stars, handful reside in or near resonance nearby planets, suggesting gentler history situ formation disk migration. Here we confirm characterize pair warm, discovered by the TESS Mission orbiting K-dwarf TOI-216. Our analysis includes additional transits transit...
Interferometric experiments designed to detect the highly redshifted 21-cm signal from neutral hydrogen are producing increasingly stringent constraints on power spectrum, but some k-modes remain systematics-dominated. Mutual coupling is a major systematic that must be overcome in order signal, and simulations reproduce effects seen data can guide strategies for mitigating mutual coupling. In this paper, we analyse 12 nights of Hydrogen Epoch Reionization Array compare against include...
The 21 cm transition from neutral Hydrogen promises to be the best observational probe of Epoch Reionisation (EoR). This has led construction low-frequency radio interferometric arrays, such as Reionization Array (HERA), aimed at systematically mapping this emission for first time. Precision calibration, however, is a requirement in observations. Due spatial compactness HERA, array prone effects mutual coupling, which inevitably lead non-smooth calibration errors that contaminate data. When...
We present the discovery of TYC9191-519-1b (TOI-150b, TIC 271893367) and HD271181b (TOI-163b, 179317684), two hot Jupiters initially detected using 30-minute cadence Transiting Exoplanet Survey Satellite TESS photometry from Sector 1 thoroughly characterized through follow-up (CHAT, Hazelwood, LCO/CTIO, El Sauce, TRAPPIST-S), high-resolution spectroscopy (FEROS, CORALIE) speckle imaging (Gemini/DSSI), confirming planetary nature signals. A simultaneous joint fit radial velocity a new fitting...
Abstract One key challenge in detecting a 21 cm cosmological signal at z > 6 is to separate the from foreground emission. This can be studied power spectrum space where confined low delay (or, equivalently, k ∥ ) modes, whereas spread out high modes. When there calibration error, however, chromaticity of gain errors propagates estimate and contaminates modes for detection. The Hydrogen Epoch Reionization Array (HERA) employs high-precision scheme using redundancy measurements. In this...
Abstract Detecting cosmological signals from the Epoch of Reionization (EoR) requires high-precision calibration to isolate foreground emission. In radio interferometry, perturbed primary beams antenna elements can disrupt precise calibration, which results in contamination foreground-free region, or EoR window, cylindrically averaged power spectrum. For Hydrogen Array (HERA), we simulate and characterize that are induced by feed motions, such as axial, lateral, tilting above 14 m dish. To...
This paper presents the design and deployment of Hydrogen Epoch Reionization Array (HERA) phase II system. HERA is designed as a staged experiment targeting 21 cm emission measurements Reionization. First results from I array are published early 2022, system nearing completion. We describe discuss progress on commissioning future upgrades. As designated Square Kilometer (SKA) pathfinder instrument, we also show number "case studies" that investigate systematics seen while system, which may...
Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different timescales. These can be isolated by designing appropriate Fourier filters in fringe-rate (FR) space, pair local sidereal time (LST). Applications FR filtering include separating correlated with rotating sky vs. those relative ground, down-weighting emission primary beam sidelobes, and suppressing noise. causes noise...
ABSTRACT Radio interferometers targeting the 21cm brightness temperature fluctuations at high redshift are subject to systematic effects that operate over a range of different time-scales. These can be isolated by designing appropriate Fourier filters in fringe-rate (FR) space, pair local sidereal time. Applications FR filtering include separating correlated with rotating sky versus those relative ground, down-weighting emission primary beam sidelobes, and suppressing noise. causes noise...
Collaborative Innovation Networks (COINs) are groups of self-motivated individuals from various parts an organization or multiple organizations, empowered by the Internet, who work together on a new idea, driven common vision. In this paper we report first results project that examines innovation networks analyzing e-mail archives some W3C (WWW consortium) working groups. These exhibit ideal characteristics for our purpose, as they form truly global over Internet to develop next generation...
Detection of the faint 21 cm line emission from Cosmic Dawn and Epoch Reionisation will require not only exquisite control over instrumental calibration systematics to achieve necessary dynamic range observations but also validation analysis techniques demonstrate their statistical properties signal loss characteristics. A key ingredient in achieving this is ability perform high-fidelity simulations kinds data that are produced by large, many-element, radio interferometric arrays have been...
We report the discovery and confirmation of two new hot Jupiters discovered by Transiting Exoplanet Survey Satellite (TESS): TOI 564 b 905 b. The transits these planets were initially observed TESS with orbital periods 1.651 d 3.739 d, respectively. conducted follow-up observations each system from ground, including photometry in multiple filters, speckle interferometry, radial velocity measurements. For b, our global fitting revealed a classical Jupiter mass $1.463^{+0.10}_{-0.096}\ M_J$...