Results 131 to 140 of about 3,196,959 (228)

Architecture Classification for Extrasolar Planetary Systems

The Astronomical Journal
This paper presents a classification framework for the architectures of planetary systems based on a complete survey of the confirmed exoplanet population. With nearly 6000 confirmed exoplanets discovered, including more than 300 multiplanet systems with
Alex R. Howe, Juliette C. Becker, Christopher C. Stark, Fred C. Adams   +3 more
doaj   +1 more source

Results of the astrometry and direct imaging testbed for exoplanet detection

, 2017
Measuring masses of long-period planets around F, G, and K stars is necessary to characterize exoplanets and assess their habitability. Imaging stellar astrometry offers a unique opportunity to solve radial velocity system inclination ambiguity and ...
Rodack, Alexander, Pluzhnik, Eugene A., Olivier Guyon, Milster, Thomas, Finan, Emily, Eugene A. Pluzhnik, Alexander Rodack, Eduardo A. Bendek, Belikov, Ruslan, Thomas Milster, Emily Finan, Justin Knight, Ruslan Belikov, Knight, Justin, Lee Johnson, Guyon, Olivier, Johnson, Lee, Bendek, Eduardo A.   +17 more
core   +1 more source

Hydrogen Airglow from an Escaping Ultrahot Jupiter Atmosphere

The Astrophysical Journal Letters
Intense high-energy irradiation of close-in gaseous exoplanets drives the rapid escape of their atmospheres, fundamentally shaping planetary demographics. While atmospheric loss is routinely observed via transit absorption in atomic hydrogen, helium, and
Yapeng Zhang, Chenliang Huang, Aaron Householder, James E. Owen, Fei Dai, Aurora Y. Kesseli, Andrew W. Howard, Julie Inglis, Howard Isaacson, Heather A. Knutson, Dimitri Mawet, Nicole Wallack, Jerry W. Xuan, Michael Zhang, Theron W. Carmichael, Daniel Huber, Rena A. Lee, Nicholas Saunders, Lauren M. Weiss, Jingwen Zhang   +19 more
doaj   +1 more source

General Dynamics Corporation Report GA-471

, 1958
From foreword: The TRIGA is a novel and unusually safe training, research, and isotope-production reactor that contains solid homogeneous uranium-zirconium-hydride-moderator fuel elements and operates at power levels in the range of from 10 kw to 250 ...
General Dynamics Corporation. General Atomic Division
core  

Ocean Circulation on Tide-locked Lava Worlds: 3D Modeling with a Simple Boundary Iteration Method

The Astrophysical Journal Letters
Tide-locked lava worlds are surface-melted rocky planets under a 1:1 tidally locked orbit (i.e., synchronously rotating) with orbital period being equal to rotation period and with permanent hot dayside and cold nightside.
Jun Yang, Chengyao Tang, Zimu Wang, Yanhong Lai, Wanying Kang   +4 more
doaj   +1 more source

Exoplanet imaging data challenge

, 2019
<p>Datasets for the Exoplanet imaging data challenge (<a href="https://exoplanet-imaging-challenge.github.io/">https://exoplanet-imaging-challenge.github.io</a>). </p ...
Carlos Alberto Gomez Gonzalez (7144439), Carlos Alberto Gomez Gonzalez   +1 more
core   +1 more source

Architectures of Planetary Systems. III. Excitation of Eccentricities and Inclinations

The Astronomical Journal
The current census of planetary systems displays a wide range of architectures. Extending earlier work, this paper investigates the correlation between our classification framework for these architectures and the distribution of eccentricities and ...
Alex R. Howe, Juliette C. Becker, Fred C. Adams   +2 more
doaj   +1 more source

Resonant and Ultra-short-period Planet Systems Are at Opposite Ends of the Exoplanet Age Distribution

The Astronomical Journal
Exoplanet systems are thought to evolve on secular timescales over billions of years. This evolution is impossible to directly observe on human timescales in most individual systems.
Stephen P. Schmidt, Kevin C. Schlaufman, Jacob H. Hamer   +2 more
doaj   +1 more source

Coupled Planetary Interior and Tidal Evolution

The Astrophysical Journal
We present a new planetary structure/thermal evolution model, designed for use in problems that couple orbital dynamics with planetary structure. We first benchmark our structural/thermal evolution calculations against the MESA stellar evolution code ...
Tim Hallatt, Sarah Millholland
doaj   +1 more source

Architectures of Exoplanetary Systems. IV. A Multiplanet Model for Reproducing the Radius Valley and Intrasystem Size Similarity of Planets around Kepler’s FGK Dwarfs

The Astrophysical Journal
The Kepler-observed distribution of planet sizes has revealed two distinct patterns: (1) a radius valley separating super-Earths and sub-Neptunes and (2) a preference for intrasystem size similarity.
Matthias Y. He, Eric B. Ford
doaj   +1 more source