Results 111 to 120 of about 8,932,640 (210)

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

System study of EPICS: the exoplanets imager for the E-ELT

SPIE Proceedings, 2010
ESO and a large European consortium completed the phase-A study of EPICS, an instrument dedicated to exoplanets direct imaging for the EELT. The very ambitious science goals of EPICS, the imaging of reflected light of mature gas giant exoplanets around bright stars, sets extremely strong requirements in terms of instrumental contrast achievable. The
Vérinaud, Christophe, Kasper, Markus E., Beuzit, Jean-Luc, Gratton, R. G., Mesa, Dino, Aller-Carpentier, Emmanuel, Fedrigo, Enrico, Abe, Lyu, Baudoz, Pierre, Boccaletti, Anthony, Bonavita, Mariangela, Dohlen, Kjetil, Hubin, Norbert N., Kerber, Florian, Korkiakoski, Visa, Antichi, Jacopo, Martinez, Patrice, Rabou, Patrick, Roelfsema, P. R., Schmid, Hans-Martin, Thatte, Niranjan A., Salter, Graeme, Tecza, Matthias, Venema, Lars, Hanenburg, Hiddo H., Jager, Rieks, Yaitskova, Natalia, Preis, Olivier, Orecchia, Mélanie, Stadler, Eric   +29 more
openaire   +2 more sources

Peas-in-a-pod across the Radius Valley: Rocky Systems Are Less Uniform in Mass but More Uniform in Size and Spacing

The Astrophysical Journal Letters
The ubiquity of “peas-in-a-pod” architectural patterns and the existence of the radius valley each presents a striking population-level trend for planets with R _p ≤ 4 R _⊕ that serves to place powerful constraints on the formation and evolution of these
Armaan V. Goyal, Songhu Wang
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

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

White dwarf systems: The composition of exoplanets

Preprint of a chapter for the 'Encyclopedia of Astrophysics' (Editor-in-Chief Ilya Mandel, Section Editor Dimitri Veras) to be published by Elsevier as a Reference ...
openaire   +2 more sources

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

Saturns, but Not Super-Jupiters, Occur More Frequently in the Presence of Inner Super-Earths

The Astrophysical Journal
Studies from recent years have reached different conclusions regarding how frequently super-Earths are accompanied by long-period giant planets and vice versa. This relation has been predicted to be mass dependent by planet-formation models.
Etienne Lefèvre-Forján, Gijs D. Mulders   +1 more
doaj   +1 more source

Pulsating stars harbouring planets

EPJ Web of Conferences, 2013
Why bother with asteroseismology while studying exoplanets? There are several answers to this question. Asteroseismology and exoplanetary sciences have much in common and the synergy between the two opens up new aspects in both fields.
Moya A.
doaj   +1 more source

Terrestrial Exoplanet Internal Structure Constraints Enabled by Comprehensive Host Star Characterization Reveal That Terrestrial Planets in Mean Motion Resonances Are Water Rich

The Astrophysical Journal
Exoplanet mass and radius inferences fundamentally rely on host star mass and radius inferences. Despite the importance of host star mass, radius, and elemental abundance inferences for the derivation of exoplanet internal structure constraints ...
Alejandra Ross, Henrique Reggiani, Kevin C. Schlaufman, Mykhaylo Plotnykov, Diana Valencia   +4 more
doaj   +1 more source