Extrasolar Planets


Stellar Activity Analysis of Barnard's Star

Stellar Activity Analysis of Barnard's Star

The search for Earth-like planets around late-type stars using ultra-stable spectrographs requires a very precise characterization of the stellar activity and the magnetic cycle of the star, since these phenomena induce radial velocity (RV) signals that can be misinterpreted as planetary signals.


Observability of Hydrogen-rich Exospheres in Earth-like Exoplanets

Observability of Hydrogen-rich Exospheres in Earth-like Exoplanets

Context. The existence of an extended neutral hydrogen exosphere around small planets can be used as an evidence for the presence of water in their lower atmosphere but, to date, such feature has not been securely detected in rocky exoplanets.


What Magnetic Fields Can Tell Us About Life on Other Planets

What Magnetic Fields Can Tell Us About Life on Other Planets

Every school kid knows that Earth has a magnetic field -- it's what makes compasses align north-south and lets us navigate the oceans. It also protects the atmosphere, and thus life, from the Sun's powerful wind.


Revised Estimates of the Frequency of Earth-like Planets in the Kepler Field

Revised Estimates of the Frequency of Earth-like Planets in the Kepler Field

The search for Earth-like planets around Sun-like stars and the evaluation of their occurrence rate is a major topic of research for the exoplanetary community.


Two Terrestrial Planet Families With Different Origins

Two Terrestrial Planet Families With Different Origins

The important role of stellar irradiation in envelope removal for planets with diameters of <2 R⊕ has been inferred both through theoretical work and the observed bimodal distribution of small planet occurrence as a function of radius.


Prospects For Detecting The Astrometric Signature of Barnard's Star b

Prospects For Detecting The Astrometric Signature of Barnard's Star b

A low-amplitude periodic signal in the radial-velocity (RV) time-series of Barnard's Star was recently attributed to a planetary companion with a minimum mass of ∼3.2 M⊕ at an orbital period of ∼233 days.


A Super-Earth Planet Candidate Orbiting at the Snow-line of Barnard's Star

A Super-Earth Planet Candidate Orbiting at the Snow-line of Barnard's Star

At a distance of 1.8 parsecs, Barnard's star (Gl 699) is a red dwarf with the largest apparent motion of any known stellar object.


A Super-Earth Has Been Discovered Orbiting Barnard's Star

A Super-Earth Has Been Discovered Orbiting Barnard's Star

The nearest single star to the Sun hosts an exoplanet at least 3.2 times as massive as Earth -- a so-called super-Earth.


Bayesian Deep Learning for Exoplanet Atmospheric Retrieval

Bayesian Deep Learning for Exoplanet Atmospheric Retrieval

Over the past decade, the study of exoplanets has shifted from their detection to the characterization of their atmospheres.


Warm super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779) and LP 819-052 (GJ 1265)

Warm super-Earths in twin orbits around the mid-type M dwarfs Ross 1020 (GJ 3779) and LP 819-052 (GJ 1265)

We announce the discovery of two planetary companions orbiting around the low mass stars Ross 1020 (GJ 3779, M4.0V) and LP 819-052 (GJ 1265, M4.5V).


Enhanced Constraints on the Interior Composition and Structure of Terrestrial Exoplanets

Enhanced Constraints on the Interior Composition and Structure of Terrestrial Exoplanets

Exoplanet interior modelling usually makes the assumption that the elemental abundances of a planet are identical to those of its host star. Host stellar abundances are good proxies of planetary abundances, but only for refractory elements.


Evidence of A Moon Outside Our Solar System Within A Stellar Habitable Zone

Evidence of A Moon Outside Our Solar System Within A Stellar Habitable Zone

Using NASA's Hubble and Kepler space telescopes, astronomers have uncovered tantalizing evidence of what could be the first discovery of a moon orbiting a planet outside our solar system.


Atmospheric Characterization of Directly Imaged Exoplanets With JWST/MIRI

Atmospheric Characterization of Directly Imaged Exoplanets With JWST/MIRI

The Mid-Infrared instrument (MIRI) on board the James Webb Space Telescope will perform the first ever characterization of young giant exoplanets observed by direct imaging in the 5-28 microns spectral range.


Water Worlds Are Common

Water Worlds Are Common

Scientists have shown that water is likely to be a major component of those exoplanets (planets orbiting other stars) which are between two to four times the size of Earth.


Atmospheric Retrieval of Exoplanets

Atmospheric Retrieval of Exoplanets

Exoplanetary atmospheric retrieval refers to the inference of atmospheric properties of an exoplanet given an observed spectrum.


A Second Planet with an Earth-like Composition Orbiting The Nearby M dwarf LHS 1140

A Second Planet with an Earth-like Composition Orbiting The Nearby M dwarf LHS 1140

LHS 1140 is a nearby mid-M dwarf known to host a temperate rocky super-Earth (LHS 1140 b) on a 24.737-day orbit.


Traces of Exomoons in Computed Flux and Polarization Phase curves of Starlight Reflected by Exoplanets

Traces of Exomoons in Computed Flux and Polarization Phase curves of Starlight Reflected by Exoplanets

Moons are suspected to influence rocky exoplanet habitability, and gaseous exoplanets in stellar habitable zones could harbour abundant and diverse moons to target in the search for extraterrestrial habitats.


Atmospheric Circulation and Thermal Phase-Curve Offset of Tidally and Non-Tidally Locked Terrestrial Exoplanets

Atmospheric Circulation and Thermal Phase-Curve Offset of Tidally and Non-Tidally Locked Terrestrial Exoplanets

Using an idealised general circulation model, we investigate the atmospheric circulation of Earth-like terrestrial planets in a variety of orbital configurations.


Exoplanet Atmosphere Measurements From Direct Imaging

Exoplanet Atmosphere Measurements From Direct Imaging

In the last decade, about a dozen giant exoplanets have been directly imaged in the IR as companions to young stars.


Rocky Planet Ross 128 b Is Not Earth's Twin

Rocky Planet Ross 128 b Is Not Earth's Twin

Last autumn, the world was excited by the discovery of an exoplanet called Ross 128 b, which is just 11 light-years away from Earth.



Top stories from December.