The Spin-Orbit Evolution of GJ 667C System: The Effect of Composition and Other Planet's Perturbations

Potentially habitable planets within the habitable zone of M-dwarfs are affected by tidal interaction. We studied the tidal evolution in GJ 667C using a numerical code we call TIDEV. We reviewed the problem of the dynamical evolution focusing on the effects that a rheological treatment, different compositions and the inclusion of orbital perturbations, have on the spin-down time and the probability to be trapped in a low spin-orbit resonance. Composition have a strong effect on the spin-down time, changing, in some cases, by almost a factor of 2 with respect to the value estimated for a reference Earth-like model. We calculated the time to reach a low resonance value (3:2) for the configuration of 6 planets. Capture probabilities are affected when assuming different compositions and eccentricities variations. We chose planets b and c to evaluate the probabilities of capture in resonances below 5:2 for two compositions: Earth-like and Waterworld planets. We found that perturbations, although having a secular effect on eccentricities, have a low impact on capture probabilities and noth- ing on spin-down times. The implications of the eccentricity variations and actual habitability of the GJ 667C system are discussed.Comment: 15 pages, 9 figures, 4 tables. Accepted for publication in MNRAS - V

Mixed tête-à-tête twists as monodromies associated with holomorphic function germs

Tête-à-tête graphs were introduced by N. A’Campo in 2010 with the goal of modeling the monodromy of isolated plane curves. Mixed tête-à-tête graphs provide a generalization which define mixed tête-à-tête twists, which are pseudo-periodic automorphisms on surfaces. We characterize the mixed tête-à-tête twists as those pseudo-periodic automorphisms that have a power which is a product of right-handed Dehn twists around disjoint simple closed curves, including all boundary components. It follows that the class of tête-à-tête twists coincides with that of monodromies associated with reduced function germs on isolated complex surface singularities. Finally, using the language of plumbing calculus, we relate horizontal open book decompositions of graph manifolds with mixed tête-à-tête graphs via two algorithms

La región de líneas coronales en galaxias seyfert 1 y seyfert 2

Varias muestras de espectros de galaxias Seyfert fueron analizadas con el fin de estudiar la emisión de líneas coronales (LCs). La primera muestra estuvo conformada por 54 núcleos activos con espectros en el infrarrojo cercano (0.8-2.3 μm); la segunda es una selección de 265 galaxias en las que se detectó al menos una línea coronal en el rango óptico del espectro, obtenidos por la prospección del cielo Sloan (SDSS, por sus siglas en inglés). Una tercera muestra estuvo constituida por 34 galaxias emisoras de LCs (20 de las cuales fueron obtenidas del SDSS) y las restantes tomadas en el observatorio de Pico dos Dias en Brasil. Se encontraron fuertes correlaciones entre las luminosidades de las LCs (tanto en el IR cercano como en el óptico) y la luminosidad de rayos X, tanto suaves como duros, lo que favorece el mecanismo de fotoionización como principal responsable de la ionización. También se observó moderadas correlaciones entre la luminosidad de las LCs y la luminosidad en radio en 1.4 GHz, hasta valores de esta cercanos a 1041.5 erg. s-1 Hz-1, sugiriendo una interacción entre el chorro de radio y la emisión coronal. Así mismo se estudió el comportamiento del ancho completo a mitad de la altura (FWHM) de las LCs presentes en el NIR en función del potencial de ionización encontrándose que en algunos objetos puede existir un gradiente de densidad que desexcite las LCs de más alta ionización. Igualmente, basados en una muestra de galaxias emisoras de LCs bastante amplia, se verificó la anisotropía de la emisión de LCs en función del tipo de AGN lo que a su vez sugiere un escenario de formación de LCs el cual puede ubicarse de forma preferencial al interior del toroide oscurecedor que postulan los modelos de unificación. Adicionalmente, con una muestra de espectros especialmente seleccionados, se realizó un estudio de determinación de condiciones físicas de la zona de emisión coronal. También se estudiaron perfiles de líneas y desplazamientos del pico de emisión de algunas LCs en el óptico de espectros de buena resolución y de buena relación señal/ruido, señalando que pueden existir dos zonas principales de emisión coronal, una al interior del toroide y otra, minoritaria, en la zona más interna de la región de líneas delgadas. / Abstract. Several samples of spectra of Seyfert galaxies were analyzed with the purpose of study the emission of coronal lines (CLs). The first sample was constituted by 54 active galactic nuclei with near infrared spectra (0.8-2.3 μm); the second sample is a selection of 265 galaxies (coming from the Sloan Digital Sky Survey, SDSS) in whose spectra at least one CL was detected. The final sample was composed by 34 spectra of galaxies emitting CLs (20 obtained from the SDSS) and the remaining obtained from Pico dos Dias observatory (Brazil). It was found strong correlations between the luminosities of CLs (both in the near IR as well as in the optical) and the X-rays luminosities (hard and soft) which favors the photoionization mechanism as the main responsible of the ionization. It was observed moderate correlations between the luminosities of CLs and the radio luminosity at 1.4 GHz (up to a value of 1041.5 erg. s-1 Hz-1) suggesting a possible interaction of the radio jet with the intensity of the coronal emission. On the another hand, it was studied the behavior of the Full Width at the Half the Maximum (FWHM) of the near IR CLs with respect the ionization potential finding that in some galaxies there exists a gradient of density that de-excite those CLs with higher ionization potentials. Additionally, based on a robust sample of galaxies, it was confirmed an anisotropy in the emission of CLs with respect to the type of galaxy which indicates that the interior of the torus is the main site of coronal emission. Futhermore, with spectra showing high coronal emission, a study was carried out to determine physical conditions of the coronal emission zone. Finally, a study of the profiles and shift of the peak emission of some emission lines suggest the existence of two emission zones: the inner face of the obscuring torus and the most interior zone of the narrow line region.Doctorad

Investigations on the Genus Rhizoecus (Hemiptera: Rhizoecidae) with Description of Two New Species from South America

Neotropical species of the scale insect genus Rhizoecus Kunckel d'Herculais (Hemiptera: Coccomorpha: Rhizoecidae) found in soil sample material of the Hungarian Natural History Museum were studied. Two new Rhizoecus species, Rhizoecus kontschani Kaydan and Konczne Benedicty sp. n., and Rhizoecus granaradewillinkae Kaydan and Szita sp. n., are described and illustrated based on the adult females. Also, the adult females of Rhizoecus keysensis Hambleton and Rhizoecus pseudocacticans Hambleton are illustrated. An identification key and new additional locality records for the currently known Rhizoecus species are provided

Una aplicación de las series de lie en el estudio del problema de los dos cuerpos clásico

The classical two-body problem is analyzed by Lie series through a common regularization. It is showed that by an appropriate change of the independent variable (introducing a pseudo-time) is possible to obtain six differential equations which, integrated by Lie series, give short expressions for the components of the position and velocity vectors. In principle, the expressions are valid for the conics and the rectilinear motion.El clásico problema de dos cuerpos es analizado por series de Lie a través de una regularización común. Se muestra que por un cambio adecuado de la variable independiente (la introducción de un pseudo-tiempo) es posible obtener seis ecuaciones diferenciales que, integradas por series de Lie, dan expresiones cortas para los componentes de los vectores posición y velocidad. En principio, las expresiones son válidas para las cónicas y el movimiento rectilíneo

A GPU-accelerated real-time NLMeans algorithm for denoising color video sequences

Abstract. The NLMeans filter, originally proposed by Buades et al., is a very popular filter for the removal of white Gaussian noise, due to its simplicity and excellent performance. The strength of this filter lies in exploiting the repetitive character of structures in images. However, to fully take advantage of the repetitivity a computationally extensive search for similar candidate blocks is indispensable. In previous work, we presented a number of algorithmic acceleration techniques for the NLMeans filter for still grayscale images. In this paper, we go one step further and incorporate both temporal information and color information into the NLMeans algorithm, in order to restore video sequences. Starting from our algorithmic acceleration techniques, we investigate how the NLMeans algorithm can be easily mapped onto recent parallel computing architectures. In particular, we consider the graphical processing unit (GPU), which is available on most recent computers. Our developments lead to a high-quality denoising filter that can process DVD-resolution video sequences in real-time on a mid-range GPU

The Spin-Orbit Evolution of GJ 667C System: The Effect of Composition and Other Planet’s Perturbations

Potentially habitable planets within the habitable zone of M dwarfs are affected by tidal interaction. We studied tidal evolution in GJ 667C using a numerical code we call TIDEV. We reviewed the problem of dynamical evolution, focusing on the effects of a rheological treatment, different compositions and the inclusion of orbital perturbations on the spin-down time and the probability of becoming trapped in a low spin-orbit resonance. The composition has a noticeable effect on the spin-down time, which changes, in some cases, by almost a factor of 2 with respect to the value estimated for a reference Earth-like model. We calculated the time required to reach a low resonance value (3:2) for a configuration of six planets. Capture probabilities are affected when assuming different compositions and eccentricity variations. We chose planets b and c to evaluate the probabilities of capture in resonances below 5:2 for two compositions: Earth-like and Waterworld planets. We found that perturbations, although having a secular effect on eccentricities, have a low impact on capture probabilities and no effect on spin-down times. The implications of the eccentricity variations and actual habitability of the GJ 667C system are discussed.Facultad de Ciencias Astronómicas y Geofísica

First records of the iceryine scale insects \u3ci\u3eCrypticerya brasiliensis\u3c/i\u3e (Hempel) and \u3ci\u3eCrypticerya genistae\u3c/i\u3e (Hempel) (Hemiptera: Monophlebidae) for Colombia

Abstract. Crypticerya brasiliensis (Hempel) and Crypticerya genistae (Hempel) (Hemiptera: Monophlebidae: Iceryini) are herein reported for the fi rst time in Colombia. The above two species and Crypticerya multicicatrices Kondo and Unruh and Crypticerya zeteki (Cockerell) are briefl y diagnosed based on the adult females. The presence of C. zeteki in Colombia is confi rmed and a key to the adult females of species of the tribe Iceryini reported in Colombia is provided. Resumen. Se reportan por primera vez a Crypticerya brasiliensis (Hempel) y Crypticerya genistae (Hempel) (Hemiptera: Monophlebidae: Iceryini) en Colombia. Las dos especies arriba mencionadas junto con Crypticerya multicicatrices Kondo y Unruh y Crypticerya zeteki (Cockerell) se diagnostican brevemente con base en morfología de las hembras adultas. Se confi rma la presencia de C. zeteki en Colombia y se provee una clave para las hembras adultas de las especies de la tribu Iceryini registradas en Colombia

Self-consistent modelling of the dust component in protoplanetary and circumplanetary disks: the case of PDS 70

Direct observations of young stellar objects are important to test established theories of planet formation. PDS 70 is one of the few cases where robust evidence favours the presence of two planetary mass companions inside the gap of the transition disk. Those planets are believed to be going through the last stages of accretion from the protoplanetary disk, a process likely mediated by a circumplanetary disk (CPD). We aim to develop a three dimensional radiative transfer model for the dust component of the PDS 70 system which reproduces the system's global features observed at two different wavelengths: 855 $\mu\, \mathrm{m}$ with ALMA and 1.25 $\mu\, \mathrm{m}$ with VLT/SPHERE. We use this model to investigate the physical properties of the planetary companion PDS 70 c and its potential circumplanetary disk. We select initial values for the physical properties of the planet and CPD through appropriate assumptions about the nature and evolutionary stage of the object. We modify iteratively the properties of the protoplanetary disk until the predictions retrieved from the model are consistent with both data sets. We provide a model that jointly explains the global features of the PDS 70 system seen in submillimeter and polarised-scattered light. Our model suggests that spatial segregation of dust grains is present in the protoplanetary disk. The submillimeter modelling of the PDS 70 c source favours the presence of an optically thick CPD and places an upper limit to its dust mass of 0.7 $M_\oplus$. Furthermore, analysis of the thermal structure of the CPD demonstrates that the planet luminosity is the dominant heating mechanism of dust grains inside 0.6 au from the planet while heating by stellar photons dominates at larger planetocentric distances.Comment: accepted for publication in A&

Evaluación de la reacción de nueve genotipos de papa (solanum tuberosumsubsp. andigena) al ataque de phytophthora infestans (mont) de bary

El presente trabajo se realizó en el municipio de Pasto, departamento de Nariño, Colombia, a 2.710 msnm. El objetivo fue evaluar la reacción de los clones de papa Blanca, Pintada, Rosada tipo Capiro, Roja Guata, Roja Redonda y Roja Loca y tres variedades mejoradas: Parda Suprema, Roja Nariño y Betina, al ataque de la gota (Phytophthora infestans). Se utilizó un diseño de bloques al azar con cuatro repeticiones y nueve tratamientos. Para la variable severidad los mejores genotipos fueron Blanca, Pintada, Parda Suprema y Betina con un promedio de 19,72; 21,99; 23,15 y 23,62%, respectivamente. El mejor rendimiento fue obtenido por los genotipos Blanca, Pintada, Parda Suprema, Betina y Roja Loca con 29,61; 24,66; 25,71; 27,12 y 28,05 t•ha-1, en su orden