Extrasolar Planets


Exoplanetary Atmosphere Target Selection in the Era of Comparative Planetology

Exoplanetary Atmosphere Target Selection in the Era of Comparative Planetology

Large-scale transit surveys such as NGTS, TESS and PLATO promise to deliver a wealth of potential targets for follow-up transmission spectroscopy study.


Water And The Interior Structure Of Terrestrial Planets And Icy Bodies

Water And The Interior Structure Of Terrestrial Planets And Icy Bodies

Water content and the internal evolution of terrestrial planets and icy bodies are closely linked. The distribution of water in planetary systems is controlled by the temperature structure in the protoplanetary disk and dynamics and migration of planetesimals and planetary embryos.


Carbon Cycling and Habitability of Earth-size Stagnant Lid Planets

Carbon Cycling and Habitability of Earth-size Stagnant Lid Planets

Models of thermal evolution, crustal production, and CO2 cycling are used to constrain the prospects for habitability of rocky planets, with Earth-like size and composition, in the stagnant lid regime.


Two Super-Earths Orbit Star K2-18

Two Super-Earths Orbit Star K2-18

New research using data collected by the European Southern Observatory (ESO) has revealed that a little-known exoplanet called K2-18b could well be a scaled-up version of Earth. Just as exciting, the same researchers also discovered for the first time that the planet has a neighbor.


Secondary Atmospheres On HD 219134 b and c

Secondary Atmospheres On HD 219134 b and c

We analyze the interiors of HD~219134~b and c, which are among the coolest super Earths detected thus far. Without using spectroscopic measurements, we aim at constraining if the possible atmospheres are hydrogen-rich or hydrogen-poor.


Influence of XUV Irradiation from Sgr A* on Planetary Habitability and Occurrence of Panspermia near the Galactic Center

Influence of XUV Irradiation from Sgr A* on Planetary Habitability and Occurrence of Panspermia near the Galactic Center

Black holes growing via the accretion of gas emit radiation that can photoevaporate the atmospheres of nearby planets.


Whole Planet Coupling Between Climate, Mantle, and Core: Implications for Evolution of Rocky Planets

Whole Planet Coupling Between Climate, Mantle, and Core: Implications for Evolution of Rocky Planets

Earth's climate, mantle, and core interact over geologic timescales.


Planet Detectability in the Alpha Centauri System

Planet Detectability in the Alpha Centauri System

We use more than a decade of radial velocity measurements for α Cen A, B, and Proxima Centauri from HARPS, CHIRON, and UVES to identify the Msini and orbital periods of planets that could have been detected if they existed.


Planet-Planet Occultations in TRAPPIST-1 and Other Exoplanet Systems

Planet-Planet Occultations in TRAPPIST-1 and Other Exoplanet Systems

We explore the occurrence and detectability of planet-planet occultations (PPOs) in exoplanet systems. These are events during which a planet occults the disk of another planet in the same system, imparting a small photometric signal as its thermal or reflected light is blocked.


Closest Temperate World Orbiting A Quiet Star Discovered

Closest Temperate World Orbiting A Quiet Star Discovered

A team working with ESO's High Accuracy Radial velocity Planet Searcher (HARPS) at the La Silla Observatory in Chile has found that the red dwarf star Ross 128 is orbited by a low-mass exoplanet every 9.9 days.


Validation of Small Kepler Transiting Planet Candidates In Or Near The Habitable Zone

Validation of Small Kepler Transiting Planet Candidates In Or Near The Habitable Zone

A main goal of NASA's Kepler Mission is to establish the frequency of potentially habitable Earth-size planets (eta Earth).


A Case for an Atmosphere on Super-Earth 55 Cancri e

A Case for an Atmosphere on Super-Earth 55 Cancri e

One of the primary questions when characterizing Earth-sized and super-Earth-sized exoplanets is whether they have a substantial atmosphere like Earth and Venus or a bare-rock surface like Mercury.


Effects of Eccentricity on Climates and Habitability of Terrestrial Exoplanets Around M dwarfs

Effects of Eccentricity on Climates and Habitability of Terrestrial Exoplanets Around M dwarfs

Eccentricity is an important orbital parameter. Understanding its effect on planetary climate and habitability is critical for us to search for a habitable world beyond our solar system.


Atmospheric Tides and Their Consequences on the Rotational Dynamics of Terrestrial Planets

Atmospheric Tides and Their Consequences on the Rotational Dynamics of Terrestrial Planets

Atmospheric tides can have a strong impact on the rotational dynamics of planets. They are of most importance for terrestrial planets located in the habitable zone of their host star, where their competition with solid tides is likely to drive the body towards non-synchronized rotation states of equilibrium, as observed in the case of Venus.


Obliquity and Eccentricity Constraints For Terrestrial Exoplanets

Obliquity and Eccentricity Constraints For Terrestrial Exoplanets

Exoplanet discoveries over recent years have shown that terrestrial planets are exceptionally common. Many of these planets are in compact systems that result in complex orbital dynamics.


Space Technology for Directly Imaging and Characterizing Exo-Earths

Space Technology for Directly Imaging and Characterizing Exo-Earths

The detection of Earth-like exoplanets in the habitable zone of their stars, and their spectroscopic characterization in a search for biosignatures, requires starlight suppression that exceeds the current best ground-based performance by orders of magnitude.


Photosynthesis Under Light Conditions Different from Earth's

Photosynthesis Under Light Conditions Different from Earth's

M-dwarfs or red dwarfs are small (0.5-0.1 solar-mass) and cool ( ~3,000 kelvin) stars and are abundant in the universe.


X-Rays Reveal Temperament of Possible Planet-Hosting Stars

X-Rays Reveal Temperament of Possible Planet-Hosting Stars

A new X-ray study has revealed that stars like the Sun and their less massive cousins calm down surprisingly quickly after a turbulent youth.


Using Polarimetry to Retrieve the Cloud Coverage of Earth-like Exoplanets

Using Polarimetry to Retrieve the Cloud Coverage of Earth-like Exoplanets

Context. Clouds have already been detected in exoplanetary atmospheres. They play crucial roles in a planet's atmosphere and climate and can also create ambiguities in the determination of atmospheric parameters such as trace gas mixing ratios.


Future Astrometric Space Missions for Exoplanet Science

Future Astrometric Space Missions for Exoplanet Science

High-precision astrometry at the sub-microarcsecond level opens up a window to study Earth-like planets in the habitable zones of Sun-like stars, and to determine their masses.



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