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Citations since 2017
Publications
Publications (25)
A very long term variability (VLPP), with period of 875 days, was observed in the long-term light curve of FS Aurigae in 2011. This periodicity was calculated on 6 cycles. We re-examine the periodicity with new observations over of the past 5 yrs. A total of 18 yrs of observations confirm the hypothesis of a third body perturbing in a secular way t...
Some Cataclysmic Variables (CVs) exhibits a very long photometric period (VLPP). We calculate the properties of a hypothetical third body, initially assumed on circular--planar orbit, by matching the modelled VLPP to the observed one of four CVs studied here: {\sl LU Camelopardalis} (LU Cam), QZ Serpentis (QZ Ser), V1007 Herculis (V1007 Her) and BK...
Some cataclysmic variables (CVs) exhibit a very long photometric period (VLPP). We calculate the properties of a hypothetical third body, initially assumed to be on a circular–planar orbit, by matching the modelled VLPP to the observed one of four CVs studied here: LU Camelopardalis, QZ Serpentis, V1007 Herculis and BK Lyncis. The eccentric and low...
A very long term variability (VLPP), with period of 875 days, was observed in the long-term light curve of FS Aurigae (FS Aur) in 2011. This periodicity was calculated over 6 cycles. We re-examined the periodicity with new observations over the past 5 yrs. A total of 18 years of observations confirm the hypothesis of a third body perturbing in a se...
To date, 17 circumbinary planets have been discovered. In this paper, we focus our attention on the stability of the Kepler
circumbinary planetary systems with only one planet, i.e. Kepler-16, Kepler-34, Kepler-35, Kepler-38, Kepler-64 and Kepler-413.
In addition to their intrinsic interest, the study of such systems is an opportunity to test our u...
We study the effect of a massive planetesimal disk on the dynamical stability
of the outer planets assuming, as has been suggested recently, that these were
initially locked in a compact and multiresonant configuration as a result of
gas-driven migration in a protoplanetary disk. The gravitational interaction
among all bodies in our simulations is...
Currently, a number of circumbinary planets have been discovered. In
this paper, we focus our attention on the long term stability (1Gyr) of
the Kepler circumbinary planetary systems with only one planet, i.e.
Kepler-16, Kepler-34, Kepler-35, Kepler-38 and Kepler 64. The
investigation is done by means of numerical simulations. By using two
differen...
The latter stages of the formation of the solar system are believed to
involve the migration of planets as a result of the gravitational
interaction between these and a massive, remnant, outer planetesimal
disc. In this paper we present a series of numerical simulations aimed
at understanding the effect of a transition, gaseous, protoplanetary
disk...
It has been suggested that the ejection of terrestrial crustal material to interplanetary space, accelerated in a large impact, may result in the interchange of biological material between Earth and other Solar System bodies. In this paper, we analyze the fate of debris ejected from Earth by means of direct numerical simulations of the dynamics of...
Aims: FS Aur is an unusual cataclysmic variable, which in
addition to its spectroscopically determined orbital period of 85.7 min
exhibits spectroscopic and photometric periods of 147 and 205 min,
correspondingly, which are attributed to the period of the fast rotating
and freely precessing magnetic white dwarf. We aim to study the origin
of a very...
In this article we focus in the study of the dynamics of the 3:1 Mean
Motion Resonance between upsilon And- d and the recently discovered upsilon
And-e. We observe the previously reported apsidal resonance between upsilon
And-c and upsilon And-d. We observe that upsilon And-d and upsilon And-e
are in an apsidal resonance too. The solution reporte...
We study some of the effects that magnetic turbulent fluctuations have on the
dynamics of pickup O+ ions in the magnetic polar regions of the Mars
ionosheath. In particular we study their effect on the bulk velocity profiles
of ions as a function of altitude over the magnetic poles, in order to compare
them with recent Mars Express data; that indic...
We study the dynamics of the upsilon-Andromedae planetary system proposed by
Curiel et al. (2011). We focus on the study of the 3:1 Mean Motion Resonance
between upsilon-Andromedae-d and the recently discovered upsilon-Andromedae-e
(hereafter upsilon-And-d and upsilon-And-e). Numerical simulations of the
dynamics of the four planet system are condu...
We present a 4-planet Keplerian fit for the radial velocity curve of the
F8V star υ Andromeda, indicating the presence of a fourth planet in
the system. We detect an additional fifth coherent signal in the radial
velocity curve which we attribute to stellar activity. The discovery of
a new planet around υ Andromedae makes this system the fifth to
c...
Here we revisited the article published by Gladman et al. 2005 in which is assumed that asteroidal and cometary impacts onto Earth can liberate material containing viable microorganisms, we studied the subsequent distribution of the escaping impact ejecta throughout the inner Solar System on time scales of 30,000 years. We reproduce their results a...
We present here results of numerical calculations demonstrating that the very long periodic variability detected in the Cataclysmic Variable FS Aur can be the result of eccentricity modulation of a close binary (CB) orbit induced by the presence of a third body on a circumbinary orbit. A third component with a substellar mass on a circular, relativ...
FS Aurigae is a unusual cataclysmic variable (CV) that has two different periods, the spectroscopically determined orbital period of 85.7min (Thorstensen et al. 1996) and a photometric modulation of 205.5 min (Tovmassian et al. 2003), attributed to the freely precessing period of a magnetized dwarf. There is finally a new very long period first rep...
The study of planetary ring systems is a key component of planetary
science for several reasons: 1) The evolution and current states of
planets and their satellites are affected in many ways by rings, while
2) conversely, properties of planets and moons and other solar system
populations are revealed by their effects on rings; 3) highly structured...
In this article we explore the aspect of the F ring with respect to the anti-alignment configuration between the ring and Prometheus. We focus our attention on the shape of the F ring's azimuthal channels which were first reported by Porco et al. (2005) and numerically explored by Murray et al. (2005), who found excellent agreement between Cassini'...
How Prometheus creates azimuthal structure in the F ring has been puzzling the scientists since these features were first observed during the Saturn Orbital Insertion (hereafter SOI) in July 2004. The SOI configuration is studied numerically with updated orbits, the plots obtained are in excellent agreement with the observed structures by Cassini s...
Here in this research we develop a very simple model to fit the edges of the Azimuthal Channels observed in Saturn's F ring. This model has been used first to fit the Saturn Orbital Insertion configuration and then for the antialignment configuration. Then, since we noticed that width of the channels depend strongly in the mass of Prometheus used,...
Los anillos planetarios delgados se cree que son estabilizados por peque as lunas a las cuales se les llaman pastoras que orbitan dentro o cerca de los anillos y ayudan a estabilizarlos por sus in uencias gravitacionales. El anillo F de Saturno (el cual se encuentra justo afuera del sistema principal de anillos) tiene como pastoras a dos lunas. Pro...
Images of Saturn's narrow and contorted F ring returned by the Cassini spacecraft have revealed phenomena not previously detected in any planetary ring system. The perturbing effect of the inner shepherding satellite, Prometheus, seems to introduce channels through the F ring and a 'streamer'--a line of particles that link the ring to the satellite...
Images of Saturn's F ring region obtained by the Cassini ISS cameras have shown periodic structures ("gores") in azimuth. Some images also show a "streamer" connecting the inner part of the F-Ring with Prometheus, the inner shepherding satellite. The origin and short-term evolution of these features have been explored using a numerical model that i...
