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The advent of x-ray free-electron lasers (XFELs) has enabled a range of new experimental investigations into the properties of matter driven to extreme conditions via intense x-ray-matter interactions. The femtosecond timescales of these…

Nearly 30 years after the discovery of the first exoplanet around a main sequence star, thousands of planets have now been confirmed. These discoveries have completely revolutionized our understanding of planetary systems, revealing types…

Earth and Planetary Astrophysics · Physics 2024-04-25 Bradford J. Foley

Gas clumps formed within massive gravitationally unstable circumstellar discs are potential seeds of gas giant planets, brown dwarfs and companion stars. Simulations show that competition between three processes -- migration, gas accretion…

Earth and Planetary Astrophysics · Physics 2019-05-01 Mark Fletcher , Sergei Nayakshin , Dimitris Stamatellos , Walter Dehnen , Farzana Meru , Lucio Mayer , Hongping Deng , Ken Rice

In this chapter we summarize current knowledge of the internal structure of giant planets. We concentrate on the importance of heavy elements and their role in determining the planetary composition and internal structure, in planet…

Earth and Planetary Astrophysics · Physics 2019-02-06 Ravit Helled , Tristan Guillot

In this paper we report on PD-SPH the new tree-sph code developed in Padua. The main features of the code are described and the results of a new and independent series of 1-D and 3-D tests are shown. The paper is mainly dedicated to the…

Astrophysics · Physics 2009-10-30 Giovanni Carraro , Cesario Lia , Cesare Chiosi

Physical conditions deep within planets and exoplanets have yet to be measured directly, but indirect methods can calculate them. The polytropic models are one possible solution to this problem. In the present paper, we assume that the…

Earth and Planetary Astrophysics · Physics 2022-08-15 Essam Elkholy , Mohamed I. Nouh

This article reviews the emerging field of exo-geoscience, focusing on the geological and geophysical processes thought to influence the evolution and (eu)habitability of rocky exoplanets. We examine the possible roles of planetary…

Earth and Planetary Astrophysics · Physics 2026-01-21 Tilman Spohn , Akli Roberge , M. J. Way , João C. Duarte , Francesca Miozzi , Philipp Baumeister , Paul Byrne , Charles Lineweaver

Recent strides have been made developing dust evolution models for galaxy formation simulations but these approaches vary in their assumptions and degree of complexity. Here we introduce and compare two separate dust evolution models…

The composition of an atmosphere has integrated the geological history of the entire planetary body. However, the long-term evolutions of the atmospheres of the terrestrial planets are not well documented. For Earth, there were until…

Earth and Planetary Astrophysics · Physics 2020-03-26 Guillaume Avice , Bernard Marty

Eclipse mapping is a powerful tool for measuring 3D profiles of exoplanet atmospheres. To date, only JWST has been capable of widely applying this technique, but as a general observatory, it is too time-limited to conduct population-level…

Giant planets have key role in shaping planetary systems. Their composition reveals information on the conditions at which planets form, and their interiors serve as natural laboratories to explore the behavior of materials at extreme…

Earth and Planetary Astrophysics · Physics 2026-05-05 Ravit Helled

Models of thermal evolution, crustal production, and CO$_2$ cycling are used to constrain the prospects for habitability of rocky planets, with Earth-like size and composition, in the stagnant lid regime. Specifically, we determine the…

Earth and Planetary Astrophysics · Physics 2018-07-25 Bradford J. Foley , Andrew J. Smye

Future direct-imaging exoplanet missions such as WFIRST/AFTA, Exo-C, and Exo-S will measure the reflectivity of exoplanets at visible wavelengths. The exoplanets to be observed will be located further away from their parent stars than is…

Earth and Planetary Astrophysics · Physics 2014-12-25 Renyu Hu

Understanding when global glaciations occur on Earth-like planets is a major challenge in climate evolution research. Most models of how greenhouse gases like CO2 evolve with time on terrestrial planets are deterministic, but the complex,…

Earth and Planetary Astrophysics · Physics 2021-05-12 R. Wordsworth

Phase separation between hydrogen and helium at high pressures and temperatures leads to the rainout of helium in the deep interiors of Jupiter and Saturn. This process, also known as "helium rain", affects their long-term evolution.…

Earth and Planetary Astrophysics · Physics 2024-08-28 Saburo Howard , Simon Müller , Ravit Helled

Quantum electrodynamics and electroweak corrections are important ingredients for many theoretical predictions at the LHC. This paper documents APFEL, a new PDF evolution package that allows for the first time to perform DGLAP evolution up…

High Energy Physics - Phenomenology · Physics 2015-06-17 Valerio Bertone , Stefano Carrazza , Juan Rojo

Current searches for extrasolar planets have concentrated on observing the reflex Doppler shift of solar-type stars. Little is known, however, about planetary systems around non-solar-type stars. We suggest a new method to extend planetary…

Astrophysics · Physics 2009-10-31 Y. -H. Chu , B. C. Dunne , R. A. Gruendl , W. Brandner

We review several aspects of the calculation of exoplanet model atmospheres in the current era, with a focus on understanding the temperature-pressure profiles of atmospheres and their emitted spectra. Most of the focus is on gas giant…

Earth and Planetary Astrophysics · Physics 2018-04-24 Jonathan J. Fortney

The hundreds of exoplanets that have been discovered in the past two decades offer a new perspective on planetary structure. Instead of being the archetypal examples of planets, those of our Solar System are merely possible outcomes of…

Earth and Planetary Astrophysics · Physics 2015-06-18 David S. Spiegel , Jonathan J. Fortney , Christophe Sotin

Chemical modeling and synthetic observations are powerful methods to interpret observations, both requiring a knowledge of the physical conditions. In this paper, we present the Analytical Protostellar Environment (APE) code, which aims at…