Results 21 to 30 of about 18,730 (188)

Migration of pairs of giant planets in low-viscosity discs [PDF]

A&A 672, A190 (2023), 2023
When considering the migration of Jupiter and Saturn, a classical result is to find the planets migrating outwards and locked in the 3:2 mean motion resonance (MMR). These results were obtained in the framework of viscously accreting discs, in which the observed stellar accretion rates constrained the viscosity values.
arxiv   +1 more source

Tailored negativity. Campaign consultants, candidate personality, and attack politics

Swiss Political Science Review, Volume 28, Issue 2, Page 338-360, June 2022., 2022
Abstract To what extent are negative election campaigns “tailored” to the personality of the candidates? And with what electoral consequences? In this article we tackle these questions by focusing on the 2019 Swiss federal election. We estimate the presence of negativity as a function of the personality profile of competing candidates (Big Five) and ...
Alessandro Nai, Anke Tresch, Jürgen Maier   +2 more
wiley   +1 more source

Effects of Planetesimal Scattering: Explaining the Observed Offsets from Period Ratios 3:2 and 2:1

The Astrophysical Journal, 2023
The observed deficit and excess of adjacent planet pairs with period ratios narrow and wide of 3:2 and 2:1, the nominal values for the corresponding mean-motion resonances (MMRs), have intrigued many. Previously, using a suite of simulations, Chatterjee &
Tuhin Ghosh, Sourav Chatterjee
doaj   +1 more source

The Orbit of Warm Jupiter WASP-106 b is Aligned with its Star

The Astronomical Journal, 2023
Understanding orbital obliquities, or the misalignment angles between a star’s rotation axis and the orbital axis of its planets, is crucial for unraveling the mechanisms of planetary formation and migration.
Jan-Vincent Harre, Alexis M. S. Smith, Teruyuki Hirano, Szilárd Csizmadia, Amaury H. M. J. Triaud, David R. Anderson   +5 more
doaj   +1 more source

Migration of Jupiter mass planets in discs with laminar accretion flows [PDF]

A&A 658, A32 (2022), 2021
Migration of giant planets in discs with low viscosity has been studied recently. The proportionality between migration speed and the disc's viscosity is broken by the presence of vortices that appear at the edges of the planet-induced gap. Our goal is to investigate vortex-driven migration in low-viscosity discs in the presence of radial advection of ...
arxiv   +1 more source

Oblique rings from migrating exomoons: A possible origin for long-period exoplanets with enlarged radii [PDF]

A&A 675, A174 (2023), 2023
Context. The extremely low density of several long-period exoplanets in mature systems is still unexplained -- with HIP 41378 f being archetypical of this category. It has been proposed that such planets could actually have normal densities but be surrounded by a ring observed approximately face on, mimicking the transit depth of a puffy planet.
arxiv   +1 more source

A High-Eccentricity Warm Jupiter Orbiting TOI-4127

The Astronomical Journal, 2023
We report the discovery of TOI-4127 b, which is a transiting, Jupiter-sized exoplanet on a long-period ( $P={56.39879}_{-0.00010}^{+0.00010}$ days) and a high-eccentricity orbit around a late F-type dwarf star.
Arvind F. Gupta, Jonathan M. Jackson, Guillaume Hébrard, Andrea S. J. Lin, Keivan G. Stassun, Jiayin Dong, Steven Villanueva Jr., Diana Dragomir, Suvrath Mahadevan, Jason T. Wright, Jose M. Almenara, Cullen H. Blake, Isabelle Boisse, Pía Cortés-Zuleta, Paul A. Dalba, Rodrigo F. Díaz, Eric B. Ford, Thierry Forveille, Robert Gagliano, Samuel Halverson, Neda Heidari, Shubham Kanodia, Flavien Kiefer, David w. Latham, Michael W. McElwain, Ismael Mireles, Claire Moutou, Joshua Pepper, George R. Ricker, Paul Robertson, Arpita Roy, Martin Schlecker, Christian Schwab, S. Seager, Avi Shporer, Guđmundur Stefánsson, Ryan C. Terrien, Eric B. Ting, Joshua N. Winn, Allison Youngblood   +39 more
doaj   +1 more source

The Aligned Orbit of the Eccentric Proto Hot Jupiter TOI-3362b

The Astrophysical Journal Letters, 2023
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.
Juan I. Espinoza-Retamal, Rafael Brahm, Cristobal Petrovich, Andrés Jordán, Guđmundur Stefánsson, Elyar Sedaghati, Melissa J. Hobson, Diego J. Muñoz, Gavin Boyle, Rodrigo Leiva, Vincent Suc   +10 more
doaj   +1 more source

Prospects from TESS and Gaia to Constrain the Flatness of Planetary Systems

The Astronomical Journal, 2023
The mutual inclination between planets orbiting the same star provides key information to understand the formation and evolution of multiplanet systems.
Juan I. Espinoza-Retamal, Wei Zhu, Cristobal Petrovich   +2 more
doaj   +1 more source

Orbital Alignment of the Eccentric Warm Jupiter TOI-677 b

The Astronomical Journal, 2023
Warm Jupiters lay out an excellent laboratory for testing models of planet formation and migration. Their separation from the host star makes tidal reprocessing of their orbits ineffective, which preserves the orbital architectures that result from the ...
Elyar Sedaghati, Andrés Jordán, Rafael Brahm, Diego J. Muñoz, Cristobal Petrovich, Melissa J. Hobson   +5 more
doaj   +1 more source