Extrasolar Planets


UV Surface Environment of Earth-like Planets Orbiting FGKM Stars Through Geological Evolution

UV Surface Environment of Earth-like Planets Orbiting FGKM Stars Through Geological Evolution

The UV environment of a host star affects the photochemistry in the atmosphere, and ultimately the surface UV environment for terrestrial planets and therefore the conditions for the origin and evolution of life.


Giant Comet-like Tail Discovered on Small Exoplanet

Giant Comet-like Tail Discovered on Small Exoplanet

The prospect of finding ocean-bearing exoplanets has been boosted, thanks to a pioneering new study. An international team of scientists, including from the University of Exeter, has discovered an immense cloud of hydrogen escaping from a Neptune-sized exoplanet.


Effect of UV Radiation on the Spectral Fingerprints of Earth-like Planets Orbiting M dwarfs

Effect of UV Radiation on the Spectral Fingerprints of Earth-like Planets Orbiting M dwarfs

We model the atmospheres and spectra of Earth-like planets orbiting the entire grid of M dwarfs for active and inactive stellar models with Teff = 2300K to Teff = 3800K and for six observed MUSCLES M dwarfs with UV radiation data.


Photochemistry Generated by Stellar Cosmic Rays for Planets in the Habitable Zone of M-Dwarf Stars

Photochemistry Generated by Stellar Cosmic Rays for Planets in the Habitable Zone of M-Dwarf Stars

Understanding whether M-dwarf stars may host habitable planets with Earth-like atmospheres and biospheres is a major goal in exoplanet research.


Origin and Stability of Exomoon Atmospheres: Implications for Habitability

Origin and Stability of Exomoon Atmospheres: Implications for Habitability

We study the origin and escape of catastrophically outgassed volatiles (H2O, CO2) from exomoons with Earth-like densities and masses of 0.1M⊕, 0.5M⊕ and 1M⊕ orbiting an extra-solar gas giant inside the habitable zone of a young active solar-like star.


Astronomers Create An Array of Earth-like Planet Models

Astronomers Create An Array of Earth-like Planet Models

To sort out the biological intricacies of Earth-like planets, astronomers have developed computer models that examine how ultraviolet radiation from other planets' nearby suns may affect those worlds, according to new research published June 10 in Astrophysical Journal.


Impact flux of Asteroids and Water Transport to the Habitable Zone in Binary Star Systems

Impact flux of Asteroids and Water Transport to the Habitable Zone in Binary Star Systems

By now, observations of exoplanets have found more than 50 binary star systems hosting 71 planets.


Circular Orbits Identified for Small Exoplanets

Circular Orbits Identified for Small Exoplanets

Viewed from above, our solar system's planetary orbits around the sun resemble rings around a bulls-eye. Each planet, including Earth, keeps to a roughly circular path, always maintaining the same distance from the sun.


The Role of Dynamics on the Habitability of an Earth-like Planet

The Role of Dynamics on the Habitability of an Earth-like Planet

From the numerous detected planets outside the Solar system, no terrestrial planet comparable to our Earth has been discovered so far.


Rocky Planets in the Habitable Zone of Tight Binary Stars with a Known Gas Giant

Rocky Planets in the Habitable Zone of Tight Binary Stars with a Known Gas Giant

Locating planets in HabitableZones (HZs) around other stars is a growing field in contemporary astronomy.


Hydrodynamic Simulations of Captured Protoatmospheres Around Earth-like Planets

Hydrodynamic Simulations of Captured Protoatmospheres Around Earth-like Planets

Young terrestrial planets, when they are still embedded in a circumstellar disk, accumulate an atmosphere of nebula gas.


Magma Oceans with a Steam Atmosphere: Detectability by Future Direct Imaging

Magma Oceans with a Steam Atmosphere: Detectability by Future Direct Imaging

We present the thermal evolution and emergent spectra of solidifying terrestrial planets along with the formation of steam atmospheres.


The Snow Line - Water Delivery to Terrestrial Planets in the Habitable Zone

The Snow Line - Water Delivery to Terrestrial Planets in the Habitable Zone

The water ice or snow line is one of the key properties of protoplanetary disks that determines the water content of terrestrial planets in the habitable zone.


The Bulk Composition of Exo-planets

The Bulk Composition of Exo-planets

Priorities in exo-planet research are rapidly moving from finding planets to characterizing their physical properties. Of key importance is their chemical composition, which feeds back into our understanding of planet formation.


Characterizing Habitable Zones of Exoplanetary Systems with Large Ultraviolet/Visible/Near-IR Space Observatory

Characterizing Habitable Zones of Exoplanetary Systems with Large Ultraviolet/Visible/Near-IR Space Observatory

Understanding the surface and atmospheric conditions of Earth-size, rocky planets in the habitable zones (HZs) of low-mass stars is currently one of the greatest astronomical endeavors.


Variability in the Super-Earth 55 Cnc e

Variability in the Super-Earth 55 Cnc e

Considerable progress has been made in recent years in observations of atmospheric signatures of giant exoplanets, but processes in rocky exoplanets remain largely unknown due to major challenges in observing small planets.


Transient Sulfate Aerosols as a Signature of Exoplanet Volcanism

Transient Sulfate Aerosols as a Signature of Exoplanet Volcanism

Geological activity is thought to be important for the origin of life and for maintaining planetary habitability. We show that transient sulfate aerosols could be a signature of exoplanet volcanism, and therefore a geologically active world.


Using Near IR Spectroscopy For Characterization of Transiting Exoplanets

Using Near IR Spectroscopy For Characterization of Transiting Exoplanets

We propose a method for observing transiting exoplanets with near-infrared high-resolution spectrometers. We aim to create a robust data analysis method for recovering atmospheric transmission spectra from transiting exoplanets over a wide wavelength range in the near infrared.


Modeling The Surface Temperature of Earth-like Planets

Modeling The Surface Temperature of Earth-like Planets

We introduce a novel Earth-like planet surface temperature model (ESTM) for habitability studies based on the spatial-temporal distribution of planetary surface temperatures.


Robotically Discovering Earth's Nearest Neighbors

Robotically Discovering Earth's Nearest Neighbors

A team of astronomers using ground-based telescopes in Hawaii, California, and Arizona recently discovered a planetary system orbiting a nearby star that is only 54 light-years away. All three planets orbit their star at a distance closer than Mercury orbits the sun, completing their orbits in just 5, 15, and 24 days.



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