Browsing by Author "Espinoza Retamal, Juan"

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    Prospects from TESS and Gaia to constrain the flatness of planetary systems
    (2023) Espinoza Retamal, Juan; Zhu, Wei; Petrovich, Cristobal
    The mutual inclination between planets orbiting the same star provides key information to understand the formation and evolution of multi-planet systems. In this work, we investigate the potential of Gaia astrometry in detecting and characterizing cold Jupiters in orbits exterior to the currently known TESS planet candidates. According to our simulations, out of the $\sim 3350$ systems expected to have cold Jupiter companions, Gaia, by its nominal 5-year mission, should be able to detect $\sim 200$ cold Jupiters and measure the orbital inclinations with a precision of $\sigma_{\cos i}
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    The Aligned Orbit of the Eccentric Proto Hot Jupiter TOI-3362b
    (2023) Espinoza Retamal, Juan; Brahm, Rafael; Petrovich, Cristobal; Jordán, Andrés; Stefánsson, Guðmundur; Sedaghati, Elyar; Hobson, Melissa J.; Muñoz, Diego J.; Boyle, Gavin; Leiva, Rodrigo; Suc, Vincent
    High-eccentricity tidal migration predicts the existence of highly eccentric proto-hot Jupiters on the "tidal circularization track," meaning that they might eventually become hot Jupiters, but that their migratory journey remains incomplete. Having experienced moderate amounts of the tidal reprocessing of their orbital elements, proto-hot Jupiters systems can be powerful test-beds for the underlying mechanisms of eccentricity growth. Notably, they may be used for discriminating between variants of high-eccentricity migration, each predicting a distinct evolution of misalignment between the star and the planet's orbit. We constrain the spin-orbit misalignment of the proto-hot Jupiter TOI-3362b with high-precision radial velocity observations using ESPRESSO at VLT. The observations reveal a sky-projected obliquity $\lambda = 1.2_{-2.7}^{+2.8}$ deg and constrain the orbital eccentricity to $e=0.720 \pm 0.016$, making it one of the most eccentric gas giants for which the obliquity has been measured. The large eccentricity and the striking orbit alignment of the planet suggest that ongoing coplanar high-eccentricity migration driven by a distant companion is a likely explanation for the system's architecture. This distant companion would need to reside beyond 5 au at 95% confidence to be compatible with the available radial velocity observations....
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    The Parking Lot Planet
    (2022) Best Reyes, Sergio André; Correa Horta, Fernanda; Espinoza Retamal, Juan
    We give conditions for an exoplanetary system to function as an ideal amusement park/vacation resort (with its separate parking lot, of course); in case of massive human interplanetary colonization. Our considerations stem from the fact that an amusement park needs a parking lot of roughly the same surface area, thus the best option for its construction would be a system with at least 2 planets close to each other for easy tourist transportation. We also discuss the likelihood of finding such a system out there to cut down on construction costs.