A5011661060- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Copper-based nanomaterials and applications
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- High-pressure geophysics and materials
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Aerodynamics and Fluid Dynamics Research
- Fluid Dynamics and Turbulent Flows
- Neutrino Physics Research
- Laser-Plasma Interactions and Diagnostics
- Computational Fluid Dynamics and Aerodynamics
- Scientific Computing and Data Management
- X-ray Diffraction in Crystallography
- Fluid dynamics and aerodynamics studies
- Radio Astronomy Observations and Technology
- Diamond and Carbon-based Materials Research
- Plasma and Flow Control in Aerodynamics
- Health and Medical Education
Universidad Nacional Autónoma de México
2015-2024
Instituto de Geofísica y Astronomía
2023
Instituto de Catálisis y Petroleoquímica
2009-2019
North Central State College
2013-2015
North Carolina State University
2013-2015
Universidad Autónoma Monterrey
2015
Consejo Superior de Investigaciones Científicas
2013
Instituto Nacional de Investigaciones Nucleares
2010
Brookhaven National Laboratory
2009-2010
Universidad de Cádiz
2009
The binary neutron star (BNS) merger GW170817 was the first astrophysical source detected in gravitational waves and multiwavelength electromagnetic radiation. almost simultaneous observation of a pulse gamma rays proved that BNS mergers are associated with at least some short gamma-ray bursts (GRBs). However, faint, casting doubt on association luminous, highly relativistic outflows canonical GRBs. Here we show structured jets relativistic, energetic core surrounded by slower less wings...
A novel inverse CeO(2)/CuO catalyst for preferential oxidation of CO in H(2)-rich stream (CO-PROX) has been developed on the basis a hypothesis extracted from previous work group (JACS 2007, 129, 12064). Possible separation two competing reactions involved process (of and H(2), respectively) is key to modulation overall CO-PROX activity based involvement different sites as most active ones each reactions. Achievement large size CuO particles adequate CeO(2)-CuO interfacial configurations...
We present the results of numerical simulations prompt emission short-duration gamma-ray bursts. consider from relativistic jet, mildly cocoon, and non-relativistic shocked ambient material. find that cocoon material is confined between off-axis angles 15<theta<45 degrees gives origin to X-ray transients with a duration few ~10 seconds, delayed by seconds time merger. also discuss distance at which such can be detected, finding it depends sensitively on assumptions are made about radiation...
We consider the long term evolution of debris following tidal disruption compact stars in context short gamma ray bursts (SGRBs). The initial encounter impulsively creates a hot, dense, neutrino-cooled disk capable powering prompt emission. After delay, we find that powerful winds are launched from surface disk, driven by recombination free nucleons into alpha particles. associated energy release depletes mass supply and eventually shuts off activity central engine. As result, luminosity...
Recent advances in catalysis instrumentations include synchrotron-based facilities where time-resolved X-ray scattering and absorption techniques are combined the same situ or operando experiment to study catalysts at work. To evaluate limitations of this method, we performed a series experiments new XAFS/XRD instrument National Synchrotron Light Source. Nearly simultaneous diffraction (XRD) fine-structure (XAFS) measurements structure kinetics several under reducing oxidizing conditions...
We present the results of special relativistic, adaptive mesh refinement, 3D simulations gamma-ray burst jets expanding inside a realistic stellar progenitor. Our confirm that relativistic can propagate and break out progenitor star while remaining relativistic. This result is independent resolution, even though amount turbulence variability observed in greater at higher resolutions. find propagation jet head slightly faster compared to 2D ones same resolution. behavior seems be due fact...
The dynamics of GRB jets during the afterglow phase is most reliably and accurately modelled using hydrodynamic simulations. All published simulations, however, have considered only a uniform external medium, while stratified medium expected around long duration progenitors. Here we present simulations resulting emission for both media with $ρ\propto r^{-k}$ k = 0, 1, 2. are performed in 2D special relativistic version Mezcal code. broadly similar to those derived expansion into medium. jet...
The HAWC experiment reports the first ground-based measurement of all-particle cosmic-ray spectrum in 10-500 TeV energy range. This data overlaps with direct measurements made by balloon-borne detectors as well those other higher air-shower detectors. closes an important gap between these different experiments.
Jets launched from a compact object (CO) during common envelope (CE) may play key role in the evolution of system, and also be an efficient removal channel for its material. In this work we study, through large set three-dimensional hydrodynamic simulations, effects that jets either black hole (BH) or neutron star (NS) have CE phase. The jet is self-consistently powered by fraction ($η$) mass accretion rate reaches CO. For low efficiencies ($η$<0.1\%), not able to drill material accreting...
We report on the development of Mezcal-SRHD, a new adaptive mesh refinement, special relativistic hydrodynamics (SRHD) code, developed with aim studying highly flows in Gamma-Ray Burst sources. The SRHD equations are solved using finite volume conservative solvers. correct implementation algorithms is verified by one-dimensional (1D) shock tube and multidimensional tests. code then applied to study propagation 1D spherical impulsive blast waves expanding stratified medium $\rho \propto...
Common envelope (CE) is an important phase in the evolution of many binary systems. Giant star / compact object interaction binaries plays role high-energy phenomena as well their environment. Material accreted onto may form a disk and power jet. We study analytically through numerical simulations between jet CE. determine conditions under which accreting material quenches or allows it to propagate successfully, case even be ejected. Close stellar core companion accretes at larger rate. A...
The evolution and physics of the common envelope (CE) phase are still not well understood. Jets launched from a compact object during this stage may define evolutionary outcome binary system. We focus on case in which jets neutron star (NS) engulfed outer layers red giant (RG). run set three-dimensional hydrodynamical simulations with different luminosities inclinations. luminosity jet is self-regulated by mass accretion rate an efficiency $\eta$. Depending value $\eta$ can break out BHL...
We present small-scale three-dimensional hydrodynamical simulations of the evolution a 0.3Msun main sequence star which launches two perpendicular jets within envelope 0.88Msun red giant. Based on previous large-scale simulations, we study dynamics either when secondary is grazing, it has plunged-in, or well-within giant (in each stage for ~11 days). The through common (CE) depend conditions environment as well their powering. In grazing and commencement plunge self-regulated need higher...
Before a binary system enters into common envelope (CE) phase, accretion from the primary star onto companion through Roche Lobe overflow (RLOF) will lead to formation of an disk, which may generate jets. Accretion before and during CE alter outcome interaction. Previous studies have considered different aspects this physical mechanism. Here we study properties disk formed via 3D hydrodynamic simulations RLOF mass transfer between 7 M$_\odot$, red supergiant 1.4 neutron companion. We...
We present the results of a set numerical simulations long-duration gamma-ray burst jets aimed at studying effect variable engine on peak frequency photospheric emission. Our follow propagation jet inside progenitor star, its break-out, and subsequent expansion in environment out to radius. A constant two-step-function models are considered for luminosity. show that our synthetic light curves luminosity-peak correlation analogous Golenetskii found observations. Within parameter space...
Gamma-ray burst light curves are characterized by marked variability, each showing unique properties. The origin of such at least for a fraction long GRBs, may be the result an unsteady central engine. It is thus important to study effects that episodic engine has on jet propagation and, eventually, prompt emission within collapsar scenario. Thus, in this we follow interaction pulsed outflows with their progenitor stars hydrodynamic numerical simulations both two and three dimensions. We...
An inverse CeO2/CuO catalyst in which the CuO component has been doped with Zn is examined comparison analogous Zn-free aim of enhancing performance this type systems for preferential oxidation CO H2-rich stream (CO-PROX). The catalysts are characterized by XRD, Raman spectroscopy, XANES-EXAFS, XPS, and HRTEM. Their catalytic properties explored conjunction redox studied XANES, DRIFTS under reaction conditions MS detection. It shown that presence zinc enhances CO-PROX system through...
Abstract By coupling radiation transfer calculations to hydrodynamic simulations, there have been major advancements in understanding the long gamma-ray burst (LGRB) prompt emission. Building upon these achievements, we present an analysis of photospheric emission acquired by using Monte Carlo Radiation Transfer (MCRaT) code on simulations with variable jet profiles. MCRaT propagates and Compton-scatters individual photons that injected into collimated outflow order produce synthetic light...
Abstract After two years of operation, the High-Altitude Water Cherenkov (HAWC) Observatory has analyzed TeV cosmic-ray sky over an energy range between 2.0 and 72.8 TeV. Like other detectors in northern southern hemispheres, HAWC observes energy-dependent anisotropy arrival direction distribution cosmic rays. This is dominated by a dipole moment with phase R.A. α ≈ 40° amplitude that slowly rises relative intensity from 8 × 10 −4 at 2 to 14 around 30 TeV, above which decreases strength. A...
The association of GRB170817A with GW170817 has confirmed the long-standing hypothesis that binary neutron star (BNS) mergers are progenitors at least some short gamma-ray bursts (SGRBs). This connection ushered in an era which broadband observations SGRBs, together measurements time delay between gravitational waves and electromagnetic radiation, allow to probe properties emitting outflow its engine unprecedented detail. Since structure radiating is molded by interaction a relativistic jet...
After the detection of GRB 170817A, first unambiguous off-axis gamma-ray burst (GRB), several studies tried to understand structure jets. The initial jet (directly produced by central engine) can be partially preserved, or completely modified interaction with environment. In this study, we perform three-dimensional, special relativistic hydrodynamics simulations long jets evolving through a massive progenitor star. Different scenarios were considered: Top-hat, Gaussian dominated pressure...