Extrasolar Planets


Hubble Search for Transit of the Earth-mass Exoplanet Alpha Centauri Bb

Hubble Search for Transit of the Earth-mass Exoplanet Alpha Centauri Bb

Results from exoplanet surveys indicate that small planets (super-Earth size and below) are abundant in our Galaxy. However, little is known about their interiors and atmospheres.


Calculations Show Planets in the Habitable Zone Around Most Stars

Calculations Show Planets in the Habitable Zone Around Most Stars

Astronomers have discovered thousands of exoplanets in our galaxy, the Milky Way, using the Kepler satellite and many of them have multiple planets orbiting the host star.


Habitability of Water Worlds

Habitability of Water Worlds

There are four different stable climate states for pure water atmospheres, as might exist on so-called "waterworlds".


Fourier Spectra From Exoplanets With Polar Caps and Ocean Glint

Fourier Spectra From Exoplanets With Polar Caps and Ocean Glint

The weak orbital-phase dependent reflection signal of an exoplanet contains information on the planet surface, such as the distribution of continents and oceans on terrestrial planets.


Chemical Composition of tau Ceti and Possible Effects on Terrestrial Planets

Chemical Composition of tau Ceti and Possible Effects on Terrestrial Planets

tau Ceti (HD10700), a G8 dwarf with solar mass of 0.78, is a close (3.65 pc) sun-like star where 5 possibly terrestrial planet candidates (minimum masses of 2, 3.1, 3.5, 4.3, and 6.7 Earth masses) have recently been discovered.


Water, Methane and Carbon Monoxide in the Atmosphere of Exoplanet HR8799b

Water, Methane and Carbon Monoxide in the Atmosphere of Exoplanet HR8799b

Absorption lines from water, methane and carbon monoxide are detected in the atmosphere of exoplanet HR8799b.


Some Habitable Exoplanets Could Experience Wildly Unpredictable Climates

Some Habitable Exoplanets Could Experience Wildly Unpredictable Climates

As telescopes of ever-greater power scan the cosmos looking for life, knowing where to look and where not to waste time looking will be of great value.


Varying Cloud Coverage and Reflected-Light Exoplanet Phase Curves

Varying Cloud Coverage and Reflected-Light Exoplanet Phase Curves

We use a planetary albedo model to investigate variations in visible wavelength phase curves of exoplanets. The presence of clouds on these exoplanets significantly alters their planetary albedo spectra.


What Is The Mass of Alpha Cen B b?

What Is The Mass of Alpha Cen B b?

We investigate the possibility of constraining the sin i degeneracy of alpha Cen B b -- with orbital period P=3.24 d; a = 0.042 AU; msini = 1.1 M_earth -- to estimate the true mass of the newly reported terrestrial exoplanet in the nearest stellar system to our Sun.


UV Habitability of Possible Exomoons in Observed F-star Planetary Systems

UV Habitability of Possible Exomoons in Observed F-star Planetary Systems

In the present study we explore the astrobiological significance of F-type stars of spectral type between F5 V and F9.5 V, which possess Jupiter-type planets within or close to their climatological habitable zones.


A New Chemical Scheme to Study Carbon-rich Exoplanet Atmospheres

A New Chemical Scheme to Study Carbon-rich Exoplanet Atmospheres

Atmospheres with a high C/O ratio are expected to contain an important quantity of hydrocarbons, including heavy molecules (with more than 2 carbon atoms).


Determining Interior Structure of Rocky Exoplanets From Mass and Radius Measurements

Determining Interior Structure of Rocky Exoplanets From Mass and Radius Measurements

We present an inversion method based on Bayesian analysis to constrain the interior structure of terrestrial exoplanets, in the form of chemical composition of the mantle and core size.


Earth-like Planets More Likely to Orbit Sun-like stars - Not Lower-mass Stars

Earth-like Planets More Likely to Orbit Sun-like stars - Not Lower-mass Stars

Simulations by researchers at Tokyo Institute of Technology and Tsinghua University indicate that Earth-like planets are more likely to be found orbiting Sun-like stars rather than lower-mass stars that are currently targeted, in terms of water contents of planets.


Earth and Terrestrial Planet Formation

Earth and Terrestrial Planet Formation

The growth and composition of Earth is a direct consequence of planet formation throughout the Solar System.


Colliding Winds in Low-Mass Binary Star Systems: Implications for Habitable Planets

Colliding Winds in Low-Mass Binary Star Systems: Implications for Habitable Planets

In binary star systems, the winds from the two components impact each other, leading to strong shocks and regions of enhanced density and temperature.


Planetary Systems and the Formation of Habitable Planets

Planetary Systems and the Formation of Habitable Planets

As part of a national scientific network 'Pathways to Habitability' the formation of planets and the delivery of water onto these planets is a key question as water is essential for the development of life.


Twinkle on Fast-Track Mission to Unveil Exoplanet Atmospheres

Twinkle on Fast-Track Mission to Unveil Exoplanet Atmospheres

A team of UK scientists and engineers have announced plans for a small satellite, named "Twinkle," that will give radical new insights into the chemistry, formation and evolution of planets orbiting other stars.


Scientists Predict Earth-like Planets Around Most Stars

Scientists Predict Earth-like Planets Around Most Stars

Planetary scientists have calculated that there are hundreds of billions of Earth-like planets in our galaxy which might support life.


KOI-3158: The Oldest Known System of Terrestrial-size Planets

KOI-3158: The Oldest Known System of Terrestrial-size Planets

The first discoveries of exoplanets around Sun-like stars have fueled efforts to find ever smaller worlds evocative of Earth and other terrestrial planets in the Solar System.


Potentially Habitable Planets May Start As Neptune-like Worlds

Potentially Habitable Planets May Start As Neptune-like Worlds

Two phenomena known to inhibit the potential habitability of planets tidal forces and vigorous stellar activity might instead help chances for life on certain planets orbiting low-mass stars, University of Washington astronomers have found.



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