Extrasolar Planets


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.


A Glimpse of Habitability When The Ozone Layer first Formed on Earth

A Glimpse of Habitability When The Ozone Layer first Formed on Earth

Kepler-96 is an active solar-type star harbouring a Super-Earth planet in close orbit. Its age of 2.3 Gyr is the same as the Sun when there was a considerable increase of oxygen in Earth's atmosphere due to micro-organisms living under the sea.


Rotational Spectral Unmixing of Exoplanets: Degeneracies between Surface Colors and Geography

Rotational Spectral Unmixing of Exoplanets: Degeneracies between Surface Colors and Geography

Unmixing the disk-integrated spectra of exoplanets provides a clue to heterogeneous surfaces that we cannot directly resolve in the foreseeable future.


Astrophysicists Predict Earth-like Planet in Star System 16 Light Years Away

Astrophysicists Predict Earth-like Planet in Star System 16 Light Years Away

Astrophysicists at the University of Texas at Arlington have predicted that an Earth-like planet may be lurking in a star system just 16 light years away.


Four Earth-sized Planets Detected Orbiting tau Ceti

Four Earth-sized Planets Detected Orbiting tau Ceti

A new study by an international team of astronomers reveals that four Earth-sized planets orbit the nearest sun-like star, tau Ceti, which is about 12 light years away and visible to the naked eye.


TRAPPIST-1 is Older Than Our Solar System

TRAPPIST-1 is Older Than Our Solar System

If we want to know more about whether life could survive on a planet outside our solar system, it's important to know the age of its star.



Top stories from November.