Results 41 to 50 of about 18,730 (188)

Investigating the Origins of Hot Neptunes from Radial Velocity Data

The Astronomical Journal
Hot Neptunes are extrasolar planets that are similar in size to Neptune in our solar system but are much closer to their host stars, completing an orbit in 10 days or less. The origin of hot Neptunes is not fully understood.
Sophie Y. Zheng
doaj   +1 more source

The Prevalence of Resonance Among Young, Close-in Planets

The Astronomical Journal
Multiple planets undergoing disk migration may be captured into a chain of mean-motion resonances with the innermost planet parked near the disk’s inner edge.
Fei Dai, Max Goldberg, Konstantin Batygin, Jennifer van Saders, Eugene Chiang, Nick Choksi, Rixin Li, Erik A. Petigura, Gregory J. Gilbert, Sarah C. Millholland, Yuan-Zhe Dai, Luke Bouma, Lauren M. Weiss, Joshua N. Winn   +13 more
doaj   +1 more source

Condition for Capture into First-order Mean Motion Resonances and Application to Constraints on Origin of Resonant Systems [PDF]

, 2013
We investigate the condition for capture into first-order mean motion resonances using numerical simulations with a wide range of various parameters. In particular, we focus on deriving the critical migration timescale for capture into the 2:1 resonance; additional numerical experiments for closely spaced resonances (e.g., 3:2) are also performed.
arxiv   +1 more source

Additive Manufacturing Provides Infinite Possibilities for Self‐Sensing Technology

Advanced Science, Volume 11, Issue 28, July 24, 2024.
Proprioception embedded in biological bodies can be migrated to smart devices, depending on the right configuration of materials and structures in the right place. Additive manufacturing technology can meet this very well, which provides unlimited possibilities for the preparation of self‐sensing intelligent devices.
Daobing Chen, Zhiwu Han, Junqiu Zhang, Longjian Xue, Sheng Liu   +4 more
wiley   +1 more source

Photoevaporation Does Not Create a Pileup of Giant Planets at 1 AU [PDF]

, 2018
The semimajor axis distribution of giant exoplanets appears to have a pileup near 1 AU. Photoevaporation opens a gap in the inner few AU of gaseous disks before dissipating them. Here we investigate whether photoevaporation can significantly affect the final distribution of giant planets by modifying gas surface density and hence Type II migration ...
arxiv   +1 more source

Constraining stellar tidal quality factors from planet‐induced stellar spin‐up

Astronomische Nachrichten, Volume 345, Issue 5, June 2024.
Abstract The dynamical evolution of tight star‐planet systems is influenced by tidal interactions between the star and the planet, as was shown recently. The rate at which spins and orbits in such a system evolve depends on the stellar and planetary tidal dissipation efficiency. Here, we present a method to constrain the modified tidal quality factor Q*
Nikoleta Ilić, Katja Poppenhaeger, Anna Barbara Queiroz, Cristina Chiappini   +3 more
wiley   +1 more source

Signs of Similar Stellar Obliquity Distributions for Hot and Warm Jupiters Orbiting Cool Stars

The Astronomical Journal
Transiting giant planets provide a natural opportunity to examine stellar obliquities, which offer clues about the origin and dynamical histories of close-in planets.
Marvin Morgan, Brendan P. Bowler, Quang H. Tran, Erik Petigura, Vighnesh Nagpal, Sarah Blunt   +5 more
doaj   +1 more source

Orbital Decay of Hot Jupiters due to Weakly Nonlinear Tidal Dissipation

The Astrophysical Journal, 2023
We study tidal dissipation in hot Jupiter host stars due to the nonlinear damping of tidally driven g -modes, extending the calculations of Essick & Weinberg to a wide variety of stellar host types. This process causes the planet’s orbit to decay and has
Nevin N. Weinberg, Niyousha Davachi, Reed Essick, Hang Yu, Phil Arras, Brent Belland   +5 more
doaj   +1 more source

Three Pathways for Observed Resonant Chains [PDF]

, 2018
A question driving many studies is whether the thousands of exoplanets known today typically formed where we observe them or formed further out in the disk and migrated in. Early discoveries of giant exoplanets orbiting near their host stars and exoplanets in or near mean motion resonances were interpreted as evidence for migration and its crucial role
arxiv   +1 more source

Suppression of type I migration by disk winds [PDF]

A&A 584, L1 (2015), 2015
Planets less massive than Saturn tend to rapidly migrate inward in protoplanetary disks. This is the so-called type I migration. Simulations attempting to reproduce the observed properties of exoplanets show that type I migration needs to be significantly reduced over a wide region of the disk for a long time.
arxiv   +1 more source