Extrasolar Planets


How Many Earth-like Planets Are Around Sun-like Stars?

How Many Earth-like Planets Are Around Sun-like Stars?

A new study provides the most accurate estimate of the frequency that planets that are similar to Earth in size and in distance from their host star occur around stars similar to our Sun.


Red Dots: A Temperate 1.5 Earth-mass Planet In A Compact Multi-terrestrial Planet System Around GJ1061

Red Dots: A Temperate 1.5 Earth-mass Planet In A Compact Multi-terrestrial Planet System Around GJ1061

Small low-mass stars are favourable targets for the detection of rocky habitable planets. In particular, planetary systems in the solar neighbourhood are interesting and suitable for precise characterisation. The Red Dots campaigns seek to discover rocky planets orbiting nearby low-mass stars.


Identifying Atmospheres on Rocky Exoplanets Through Inferred High Albedo

Identifying Atmospheres on Rocky Exoplanets Through Inferred High Albedo

The upcoming launch of the James Webb Space Telescope (JWST) means that we will soon have the capability to characterize the atmospheres of rocky exoplanets.


A Scaling Theory for Atmospheric Heat Redistribution on Rocky Exoplanets

A Scaling Theory for Atmospheric Heat Redistribution on Rocky Exoplanets

Atmospheric heat redistribution shapes the remote appearance of rocky exoplanets but there is currently no easy way to predict a planet's heat redistribution from its physical properties.


Two Earth-like Planets Discovered Near Teegarden's Star

Two Earth-like Planets Discovered Near Teegarden's Star

An international research team led by the University of Göttingen has discovered two new Earth-like planets near one of our closest neighboring stars.


Frequency of Planets Orbiting M dwarfs in the Solar Neighbourhood

Frequency of Planets Orbiting M dwarfs in the Solar Neighbourhood

The most abundant stars in the Galaxy, M dwarfs, are very commonly hosts to diverse systems of low-mass planets. Their abundancy implies that the general occurrence rate of planets is dominated by their occurrence rate around such M dwarfs.


Signatures of a Planet-planet Impacts Phase in Exoplanetary Systems Hosting Giant Planets

Signatures of a Planet-planet Impacts Phase in Exoplanetary Systems Hosting Giant Planets

Exoplanetary systems host giant planets on substantially non-circular, close-in orbits.


Exomoons May Be Home To Extraterrestrial Life

Exomoons May Be Home To Extraterrestrial Life

Moons orbiting planets outside our solar system could offer another clue about the pool of worlds that may be home to extra-terrestrial life, according to an astrophysicist at the University of Lincoln.


Characterization of the L 98-59 multi-planetary System with HARPS

Characterization of the L 98-59 multi-planetary System with HARPS

L 98-59 (TIC 307210830, TOI-175) is a nearby M3 dwarf around which TESS revealed three terrestrial-sized transiting planets (0.80, 1.35, 1.57 Earth radii) in a compact configuration with orbital periods shorter than 7.5 days.


Discovery and Characterization of Kepler-36b

Discovery and Characterization of Kepler-36b

We describe the circumstances that led to the discovery of Kepler-36b, and the subsequent characterization of its host planetary system.


Validation of a Temperate Fourth Planet in the K2-133 Multi-planet System

Validation of a Temperate Fourth Planet in the K2-133 Multi-planet System

We present follow-up observations of the K2-133 multi-planet system. Previously, we announced that K2-133 contained three super-Earths orbiting an M1.5V host star - with tentative evidence of a fourth outer-planet orbiting at the edge of the temperate zone.


How to Find a Planet from Transit Variations

How to Find a Planet from Transit Variations

Here we describe a story behind the discovery of Kepler-46, which was the first exoplanetary system detected and characterized from a method known as the transit timing variations (TTVs).


Unexpectedly Strong Effect of Supergranulation on the Detectability of Earth Twins Orbiting Sun-like Stars With Radial Velocities

Unexpectedly Strong Effect of Supergranulation on the Detectability of Earth Twins Orbiting Sun-like Stars With Radial Velocities

Magnetic activity and surface flows at different scales pertub radial velocity measurements.


Life Could Be Evolving Right Now on Nearest Exoplanets

Life Could Be Evolving Right Now on Nearest Exoplanets

Rocky, Earth-like planets orbiting our closest stars could host life, according to a new study that raises the excitement about exoplanets.


Exoplanetary Atmospheres: Key Insights, Challenges and Prospects

Exoplanetary Atmospheres: Key Insights, Challenges and Prospects

Exoplanetary science is on the verge of an unprecedented revolution. The thousands of exoplanets discovered over the past decade have most recently been supplemented by discoveries of potentially habitable planets around nearby low-mass stars.


Towards a More Complex Description of Chemical Profiles in Exoplanets Retrievals: A 2-layer Parameterisation

Towards a More Complex Description of Chemical Profiles in Exoplanets Retrievals: A 2-layer Parameterisation

State of the art spectral retrieval models of exoplanet atmospheres assume constant chemical profiles with altitude.


Searching for Exosatellites Orbiting L and T Dwarfs: Connecting Planet Formation to Moon Formation and Finding New Temperate Worlds

Searching for Exosatellites Orbiting L and T Dwarfs: Connecting Planet Formation to Moon Formation and Finding New Temperate Worlds

L-type and T-type dwarfs span the boundaries between main-sequence stars, brown dwarfs, and planetary-mass objects.


The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf

The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf

We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-sized planets transiting L 98-59 (TOI-175, TIC 307210830) -- a bright M dwarf at a distance of 10.6 pc.


Lightning And Charge Processes In Brown Dwarf and Exoplanet Atmospheres

Lightning And Charge Processes In Brown Dwarf and Exoplanet Atmospheres

The study of the composition of brown dwarf atmospheres helped to understand their formation and evolution. Similarly, the study of exoplanet atmospheres is expected to constrain their formation and evolutionary states.


Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth's Atmosphere and Oceans

Thermo-compositional Diabatic Convection in the Atmospheres of Brown Dwarfs and in Earth's Atmosphere and Oceans

By generalizing the theory of convection to any type of thermal and compositional source terms (diabatic processes), we show that thermohaline convection in Earth oceans, fingering convection in stellar atmospheres, and moist convection in Earth atmosphere are deriving from the same general diabatic convective instability.



Top stories from August.