Results 121 to 130 of about 2,894 (208)

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 time dependence of hot Jupiters' orbital inclinations

, 2011
Via the Rossiter-McLaughlin effect, it is possible to measure the sky-projected angle between the stellar spin and a planet's orbital spin. Observed orbital inclinations have been found to range over all possible angles.
Triaud, A.~H.~M.~J.; id_orcid, A. H. M. J. Triaud   +1 more
core   +1 more source

Two-dimensional Models of Microphysical Clouds on Hot Jupiters. I. Cloud Properties

The Astrophysical Journal
We present a new two-dimensional, bin-scheme microphysical model of cloud formation in the atmospheres of hot Jupiters that includes the effects of longitudinal gas and cloud transport.
Diana Powell, Xi Zhang
doaj   +1 more source

Exploring Warm Jupiter Migration Pathways with Eccentricities. II. Correlations with Host Star Properties and Orbital Separation

The Astronomical Journal
Warm Jupiters with orbital periods of ≈10–365 days represent a population of giant planets located well within the water ice line but beyond the region of tidal influence of their host star relevant for high-eccentricity tidal migration.
Marvin Morgan, Brendan P. Bowler, Quang H. Tran   +2 more
doaj   +1 more source

Planet population synthesis: the role of stellar encounters. [PDF]

Mon Not R Astron Soc, 2022
Ndugu N, Abedigamba OP, Andama G.
europepmc   +1 more source

Exoplanet Ephemerides Change Observations (ExoEcho). I. Transit Timing Analysis of 37 Exoplanets Using HST/WFC3 Data

The Astronomical Journal
The ExoEcho project is designed to study the photodynamics of exoplanets by leveraging high-precision transit timing data from ground- and space-based telescopes.
Xinyue Ma, Wenqin Wang, Zixin Zhang, Cong Yu, Dichang Chen, Jiwei Xie, Shangfei Liu, Li Zhou, Bo Ma   +8 more
doaj   +1 more source

Exterior Companions to Hot Jupiters Orbiting Cool Stars Are Coplanar [PDF]

, 2017
The existence of hot Jupiters has challenged theories of planetary formation since the first extrasolar planets were detected. Giant planets are generally believed to form far from their host stars, where volatile materials like water exist in their ...
Bryan, Marta, Vanderburg, Andrew, Becker, Juliette C., Adams, Fred C., Khain, Tali   +4 more
core  

Hot Jupiters and stellar magnetic activity

, 2008
Context. Recent observations suggest that stellar magnetic activity may be influenced by the presence of a close-by giant planet. Specifically, chromospheric hot spots rotating in phase with the planet orbital motion have been observed during some ...
A. F. Lanza
core   +1 more source

Stability of Multiplanet Systems through Hot Jupiter Destruction

The Astrophysical Journal Letters
Recent observational and theoretical work suggests that the sub-Jovian desert (periods ≲3 days, masses ∼10–100 M _⊕ ) hosts the remains of destroyed hot Jupiters (“desert dwellers”).
Donald Liveoak, Tim Hallatt, Sarah Millholland   +2 more
doaj   +1 more source

“Popcorn Planets” Are Not Actively Inflated by Eccentricity Tides

The Astrophysical Journal Letters
Recent discoveries have revealed a population of “popcorn planets” that have masses similar to that of Neptune but radii comparable to Jupiter, leading to exceptionally low bulk densities ρ _p  ≲ 0.3 g cm ^−3 .
Samuel W. Yee, Shreyas Vissapragada
doaj   +1 more source