Results 31 to 40 of about 18,730 (188)
Exoplanets Torqued by the Combined Tides of a Moon and Parent Star [PDF]
, 2018 In recent years, there has been interest in Earth-like exoplanets in the habitable zones of low mass stars ($\sim0.1-0.6\,M_\odot$). Furthermore, it has been argued that a large moon may be important for stabilizing conditions on a planet for life. If these two features are combined, then an exoplanet can feel a similar tidal influence from both its ...
arxiv +1 more source
An exoplanet in orbit around tau^1 Gruis [PDF]
Mon.Not.Roy.Astron.Soc.341:948,2003, 2002 We report the detection of a new candidate exoplanet around the metal-rich star tau^1 Gruis. With M sin $i$ = 1.23+/-0.18 M_JUP, a period of 1326+/-300 d and an orbit with an eccentricity of 0.14+/-0.14 it adds to the growing population of long period exoplanets with near-circular orbits. This population now comprises more than 20% of known exoplanets.
arxiv +1 more source
Dust Settling and Rapid Planetary Migration [PDF]
, 2010 Planetary migration is essential to explain the observed mass-period relation for exoplanets. Without some stopping mechanism, the tidal, resonant interaction between planets and their gaseous disc generally causes the planets to migrate inward so efficiently that they plunge into the host star within the gaseous disc lifetime ($\sim $ 1-3 Myrs).
arxiv +1 more source
Do Giant Planets Survive Type II Migration? [PDF]
, 2013 Planetary migration is one of the most serious problems to systematically understand the observations of exoplanets. We clarify that the theoretically predicted type II migration is too fast, as well as type I migration, by developing detailed analytical arguments in which the timescale of type II migration is compared with the disk lifetime.
arxiv +1 more source
Deserts and pile-ups in the distribution of exoplanets due to photoevaporative disc clearing [PDF]
Mon.Not.Roy.Astron.Soc. 422 (2012) L82-L86, 2012 We present models of giant planet migration in evolving protoplanetary discs. We show that disc clearing by EUV photoevaporation can have a strong effect on the distribution of giant planet semi-major axes. During disc clearing planet migration is slowed or accelerated in the region where photoevaporation opens a gap in the disc, resulting in "deserts"
arxiv +1 more source
Statistical Analysis of the Dearth of Super-eccentric Jupiters in the Kepler Sample
The Astronomical Journal, 2023 Hot Jupiters may have formed in situ, or been delivered to their observed short periods through one of two categories of migration mechanisms: disk migration or high-eccentricity migration.
Jonathan M. Jackson +3 more
doaj +1 more source
Initial Thermal States of Super‐Earth Exoplanets and Implications for Early Dynamos
Journal of Geophysical Research: Planets, Volume 130, Issue 2, February 2025.Abstract The accretion of Earth and the formation of a metallic core released a large amount of primordial heat and may have enabled its evolution into a habitable world. Metal‐silicate segregation likely occurs in super‐Earth exoplanets as well, but its influence on their initial thermal states has not been fully examined.
Nathaniel I. White, Jie Li
wiley +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-ray radiation (XEUV).
arxiv +1 more source
Implications of the TTV-Detection of Close-In Terrestrial Planets Around M Stars for Their Origin and Dynamical Evolution [PDF]
Detection and dynamics of transiting exoplanets, 11, id. 04004
(2011), 2010 It has been shown that an Earth-size planet or a super-Earth, in resonance with a transiting Jupiter-like body in a short-period orbit around an M star, can create detectable TTV signals (Kirste \& Haghighipour, 2011). Given the low masses of M stars and their circumstellar disks, it is expected that such a transiting giant planet to have formed at ...
arxiv +1 more source
Geodynamics of Super‐Earth GJ 486b
Journal of Geophysical Research: Planets, Volume 129, Issue 10, October 2024.Abstract Many super‐Earths are on very short orbits around their host star and, therefore, more likely to be tidally locked. Because this locking can lead to a strong contrast between the dayside and nightside surface temperatures, these super‐Earths could exhibit mantle convection patterns and tectonics that could differ significantly from those ...
Tobias G. Meier +10 more
wiley +1 more source