Results 11 to 20 of about 298 (156)

Planetary migration and the origin of the 2:1 and 3:2 (near)-resonant population of close-in exoplanets [PDF]

Astronomy & Astrophysics, 2017
We present an analytical and numerical study of the orbital migration and resonance capture of fictitious two-planet systems with masses in the super-Earth range undergoing Type-I migration. We find that, depending on the flare index and proximity to the central star, the average value of the period ratio, $P_2/P_1$, between both planets may show a ...
Ximena S. Ramos, Carolina Charalambous, Pablo Benítez-Llambay, C. Beaugé   +3 more
openalex   +5 more sources

Tidal Migration of Exoplanets around M Dwarfs: Frequency-dependent Tidal Dissipation [PDF]

The Astrophysical Journal
Abstract The orbital architectures of short-period exoplanet systems are shaped by tidal dissipation in their host stars. For low-mass M dwarfs whose dynamical tidal response comprises a dense spectrum of inertial modes at low frequencies, resolving the frequency dependence of tidal dissipation is crucial to capturing the effect of tides
Samantha Wu, Janosz W. Dewberry, Jim Fuller   +2 more
openalex   +5 more sources

Migration and Evolution of giant ExoPlanets (MEEP). II. Super-Jupiters and Lithium-rich host stars [PDF]

Monthly Notices of the Royal Astronomical Society
ABSTRACT Although hot Jupiters were the first exoplanets discovered orbiting main-sequence stars, the dominant mechanisms through which they form and evolve are not known. To address the questions surrounding their origins, the Migration and Evolution of giant ExoPlanets (MEEP) survey aims to create a complete, magnitude-limited ($G& ...
Jack Schulte, Joseph E. Rodriguez, David W. Latham, J. Shields, Noah Vowell, Melinda Soares-Furtado, Brooke Kotten, Xianyu Wang, Karen A. Collins, Allyson Bieryla, Samuel N. Quinn, Paul Benni, Catherine A. Clark, Matthew Craig, Mara L DeRung, Jason D. Eastman, Zahra Essack, Phil Evans, Rebecca Gore, Steve B. Howell, John F. Kielkopf, Colin Littlefield, Andrew W. Mann, G. Marino, Don J. Radford, Chris Stockdale, Ivan A. Strakhov, Thiam-Guan Tan, Michael Vezie, Songhu Wang, E. Bruce Watson, Samuel W. Yee, Carl Ziegler   +32 more
openalex   +3 more sources

Orbital Misalignment Of The Gj 436B Exoplanet. Constraints On The Kozai Migration Scenario

, 2018
Kozai-Lidov mechanism is a major source of dynamical evolution in multiple stellar systems and in young planetary systems with large mutual inclinations. It drives orbital eccentricities to very high values while keeping semi-major axes constant, thus reducing periastron distances.
H. Beust, V. Bourrier, C. Lovis, D. Ehrenreich   +3 more
openalex   +2 more sources

Outward Migration of Low-Mass Planets: A Key to Observed Exoplanet Demographics

The rapidly expanding catalog of exoplanets reveals a striking diversity in planetary system architectures, characterized by the prevalence of super-Earths and mini-Neptunes, and distinctive features such as the "radius valley." While inward migration has long been established as a dominant process, particularly for hot Jupiters, the role of outward ...
Revista, Zen, ASTRO, 10
  +4 more sources

exoMMR: A New Python Package to Confirm and Characterize Mean Motion Resonances

The Astronomical Journal, 2023
The study of orbital resonances allows for the constraint of planetary properties of compact systems. We can predict a system’s resonances by observing the orbital periods of the planets, as planets in or near mean motion resonance (MMR) have period ...
Mariah G. MacDonald, Michael S. Polania Vivas, Skylar D’Angiolillo, Ashley N. Fernandez, Tyler Quinn   +4 more
doaj   +1 more source

TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain

The Astronomical Journal, 2023
Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMRs). Dynamical evolution over time could disrupt the delicate resonant configuration. We present TOI-1136, a 700 ±
Fei Dai, Kento Masuda, Corey Beard, Paul Robertson, Max Goldberg, Konstantin Batygin, Luke Bouma, Jack J. Lissauer, Emil Knudstrup, Simon Albrecht, Andrew W. Howard, Heather A. Knutson, Erik A. Petigura, Lauren M. Weiss, Howard Isaacson, Martti Holst Kristiansen, Hugh Osborn, Songhu Wang, Xian-Yu Wang, Aida Behmard, Michael Greklek-McKeon, Shreyas Vissapragada, Natalie M. Batalha, Casey L. Brinkman, Ashley Chontos, Ian Crossfield, Courtney Dressing, Tara Fetherolf, Benjamin Fulton, Michelle L. Hill, Daniel Huber, Stephen R. Kane, Jack Lubin, Mason MacDougall, Andrew Mayo, Teo Močnik, Joseph M. Akana Murphy, Ryan A. Rubenzahl, Nicholas Scarsdale, Dakotah Tyler, Judah Van Zandt, Alex S. Polanski, Hans Martin Schwengeler, Ivan A. Terentev, Paul Benni, Allyson Bieryla, David Ciardi, Ben Falk, E. Furlan, Eric Girardin, Pere Guerra, Katharine M. Hesse, Steve B. Howell, J. Lillo-Box, Elisabeth C. Matthews, Joseph D. Twicken, Joel Villaseñor, David W. Latham, Jon M. Jenkins, George R. Ricker, Sara Seager, Roland Vanderspek, Joshua N. Winn   +62 more
doaj   +1 more source

The Apparent Tidal Decay of WASP-4 b Can Be Explained by the Rømer Effect

Universe, 2023
Tidal orbital decay plays a vital role in the evolution of hot Jupiter systems. As of now, this has only been observationally confirmed for the WASP-12 system.
Jan-Vincent Harre, Alexis M. S. Smith
doaj   +1 more source

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

Astronomy & Astrophysics, 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.
Saillenfest, Melaine, Sulis, Sophia, Charpentier, Paul, Santerne, Alexandre   +3 more
openaire   +3 more sources

Nuclear Processes in Dark Interstellar Matter of H(0) Decrease the Hope of Migrating to Exoplanets [PDF]

Space: Science & Technology, 2021
It is still generally assumed that interstellar travel will be possible after purely technical development and thus that mankind can move to some suitable exoplanet when needed. However, recent research indicates this not to be the case, since interstellar space is filled with enough ultradense hydrogen H(0) as stable condensed dark matter (Holmlid ...
openaire   +2 more sources