Results 11 to 20 of about 5,562 (188)
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 +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
Quantifying Orbital Migration from Exoplanet Statistics and Host Metallicities
The Astrophysical Journal, 2005 We investigate how the statistical distribution of extrasolar planets may be combined with knowledge of the host stars' metallicity to yield constraints on the migration histories of gas giant planets. At any radius, planets that barely manage to form around the lowest metallicity stars accrete their envelopes just as the gas disk is being dissipated ...
Rice, W. K. M., Armitage, Philip J.
openaire +2 more sources
The Exoplanet Population Observation Simulator. II -- Population Synthesis in the Era of Kepler [PDF]
, 2019 The collection of planetary system properties derived from large surveys such as Kepler provides critical constraints on planet formation and evolution.
Apai, Daniel +5 more
core +3 more sources
Evidence for Low-level Dynamical Excitation in Near-resonant Exoplanet Systems
The Astronomical Journal, 2023 The geometries of near-resonant planetary systems offer a relatively pristine window into the initial conditions of exoplanet systems. Given that near-resonant systems have likely experienced minimal dynamical disruptions, the spin–orbit orientations of ...
Malena Rice +20 more
doaj +1 more source
Hot Jupiters Have Giant Companions: Evidence for Coplanar High-eccentricity Migration
The Astrophysical Journal Letters, 2023 This study considers the characteristics of planetary systems with giant planets based on a population-level analysis of the California Legacy Survey planet catalog. We identified three characteristics common to hot Jupiters (HJs).
Jon K. Zink, Andrew W. Howard
doaj +1 more source
The link between disc dispersal by photoevaporation and the semi-major axis distribution of exoplanets [PDF]
, 2015 We investigate the influence of photoevaporation of protoplanetary discs on the final distribution of exoplanets semi-major axis distances. We model giant planet migration in viscous discs affected by photoevaporation driven by either pure EUV or soft X ...
Ercolano, Barbara, Rosotti, Giovanni
core +2 more sources
The Astrophysical Journal, 2023 Protoplanets formed in a marginally gravitationally unstable (MGU) disk by either core accretion or disk instability will be subject to dynamical interactions with massive spiral arms, possibly resulting in inward or outward orbital migration, mergers ...
Alan P. Boss
doaj +1 more source
Rotation periods of exoplanet host stars [PDF]
, 2010 The stellar rotation periods of ten exoplanet host stars have been determined using newly analysed Ca II H & K flux records from Mount Wilson Observatory and Stromgren b, y photometric measurements from Tennessee State University's automatic photometric ...
Baliunas +67 more
core +3 more sources
THE SIGNATURE OF THE ICE LINE AND MODEST TYPE I MIGRATION IN THE OBSERVED EXOPLANET MASS-SEMIMAJOR AXIS DISTRIBUTION [PDF]
The Astrophysical Journal, 2009 15 pages, 6 figures, and 1 table in preprint format; accepted for publication in ...
Schlaufman, Kevin C. +2 more
openaire +2 more sources