Browsing by Author "Giuppone, Cristian A."

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    Dust trapping around Lagrangian points in protoplanetary disks
    (2020) Montesinos, Matias; Garrido-Deutelmoser, Juan; Olofsson, Johan; Giuppone, Cristian A.; Cuadra, Jorge; Bayo, Amelia; Sucerquia, Mario; Cuello, Nicolas
    Aims. Trojans are defined as objects that share the orbit of a planet at the stable Lagrangian points L-4 and L-5. In the Solar System, these bodies show a broad size distribution ranging from micrometer (mu m) to centimeter (cm) particles (Trojan dust) and up to kilometer (km) rocks (Trojan asteroids). It has also been theorized that earth-like Trojans may be formed in extra-solar systems. The Trojan formation mechanism is still under debate, especially theories involving the effects of dissipative forces from a viscous gaseous environment.
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    How Jupiters Save or Destroy Inner Neptunes around Evolved Stars
    (2020) Paula Ronco, Maria; Schreiber, Matthias R.; Giuppone, Cristian A.; Veras, Dimitri; Cuadra, Jorge; Guilera, Octavio M.
    In about 6 Gyr our Sun will evolve into a red giant and finally end its life as a white dwarf. This stellar metamorphosis will occur to virtually all known host stars of exoplanetary systems and is therefore crucial for their final fate. It is clear that the innermost planets will be engulfed and evaporated during the giant phase and that planets located farther out will survive. However, the destiny of planets in-between, at similar to 1 and 10 au, has not yet been investigated with a multiplanet tidal treatment. We here combine for the first time multiplanet interactions, stellar evolution, and tidal effects in anN-body code to study the evolution of a Neptune-Jupiter planetary system. We report that the fate of the Neptune-mass planet, located closer to the star than the Jupiter-mass planet, can be very different from the fate of a single Neptune. The simultaneous effects of gravitational interactions, mass loss, and tides can drive the planetary system toward mean motion resonances. Crossing these resonances affects particularly the eccentricity of the Neptune and thereby also its fate, which can be engulfment, collision with the Jupiter-mass planet, ejection from the system, or survival at a larger separation.
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    Planet formation and stability in polar circumbinary discs
    (2019) Cuello, Nicolas; Giuppone, Cristian A.
    Context. Dynamical studies suggest that most circumbinary discs (CBDs) should be coplanar (i.e. the rotation vectors of the binary and the disc should be aligned). However, some theoretical works show that under certain conditions a CBD can become polar, which means that its rotation vector is orthogonal with respect to the binary orbital plane. Interestingly, very recent observations show that polar CBDs exist in nature (e.g. HD 98800).