Habitable Zones & Global Climate

Assessing the Interior Structure of Terrestrial Exoplanets with Implications for Habitability

Assessing the Interior Structure of Terrestrial Exoplanets with Implications for Habitability

Astrophysical observations reveal a large diversity of radii and masses of exoplanets. It is important to characterize the interiors of exoplanets to understand planetary diversity and further determine how unique, or not, Earth is.

Biosignatures & Paleobiology

OSIRIS-REx Vegetation Index of Earth with MapCam Color Image Overlaid

OSIRIS-REx Vegetation Index of Earth with MapCam Color Image Overlaid

This vegetation index, created using images taken by OSIRIS-REx's MapCam camera on Sept. 22, 2017, shows areas on Earth with abundant plant life.

Habitable Zones & Global Climate

Planetary Formation and Water Delivery in the Habitable Zone Around Solar-type Stars in Different Dynamical Environments

Planetary Formation and Water Delivery in the Habitable Zone Around Solar-type Stars in Different Dynamical Environments

Aims. We study the formation and water delivery of planets in the habitable zone (HZ) around solar-type stars. In particular, we study different dynamical environments that are defined by the most massive body in the system.

Habitable Zones & Global Climate

Circulation Regimes of Synchronously Rotating Terrestrial Planets Near The Inner Edge of the Habitable Zone

Circulation Regimes of Synchronously Rotating Terrestrial Planets Near The Inner Edge of the Habitable Zone

We investigate the atmospheric dynamics of terrestrial planets in synchronous rotation near the inner edge of the habitable zone of low-mass stars using the Community Atmosphere Model (CAM).

Biosignatures & Paleobiology

A Review of Exoplanetary Biosignatures

A Review of Exoplanetary Biosignatures

We review the field of exoplanetary biosignatures with a main focus upon atmospheric gas-phase species. Due to the paucity of data in Earth-like planetary atmospheres a common approach is to extrapolate knowledge from the Solar System and Early Earth to Earth-like exoplanets.

Extrasolar Planets

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.

Habitable Zones & Global Climate

Fitting Formulae and Constraints for the Existence of S-type and P-type Habitable Zones

Fitting Formulae and Constraints for the Existence of S-type and P-type Habitable Zones

We derive fitting formulae for the quick determination of the existence of S-type and P-type habitable zones in binary systems.

Habitable Zones & Global Climate

Exploring the Cosmic Evolution of Habitability with Galaxy Merger Trees

Exploring the Cosmic Evolution of Habitability with Galaxy Merger Trees

We combine inferred galaxy properties from a semi-analytic galaxy evolution model incorporating dark matter halo merger trees with new estimates of supernova and gamma ray burst rates as a function of metallicity from stellar population synthesis models incorporating binary interactions.

Mars

Evidence Of Ancient Sea-floor Hydrothermal Deposits On Mars

Evidence Of Ancient Sea-floor Hydrothermal Deposits On Mars

The discovery of evidence for ancient sea-floor hydrothermal deposits on Mars identifies an area on the planet that may offer clues about the origin of life on Earth

Extrasolar Planets

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.

Habitable Zones & Global Climate

Redox Evolution via Gravitational Differentiation on Low Mass Planets: Implications for Biosignatures, Water Loss and Habitability

Redox Evolution via Gravitational Differentiation on Low Mass Planets: Implications for Biosignatures, Water Loss and Habitability

The oxidation of rocky planet surfaces and atmospheres, which arises from the twin forces of stellar nucleosynthesis and gravitational differentiation, is a universal process of key importance to habitability and exoplanet biosignature detection.

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