Extrasolar Planets


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.


Cloud Atlas: High-Contrast Time-Resolved Observations of Planetary-Mass Companions

Cloud Atlas: High-Contrast Time-Resolved Observations of Planetary-Mass Companions

Directly-imaged planetary-mass companions offer unique opportunities in atmospheric studies of exoplanets. They share characteristics of both brown dwarfs and transiting exoplanets, therefore, are critical for connecting atmospheric characterizations for these objects.


Topography of (exo)planets

Topography of (exo)planets

Current technology is not able to map the topography of rocky exoplanets, simply because the objects are too faint and far away to resolve them. Nevertheless, indirect effect of topography should be soon observable thanks to photometry techniques, and the possibility of detecting specular reflections.


The CARMENES Search For Exoplanets Around M Dwarfs

The CARMENES Search For Exoplanets Around M Dwarfs

We use spectra from CARMENES, the Calar Alto high-Resolution search for M dwarfs with Exo-earths with Near-infrared and optical Echelle Spectrographs, to search for periods in chromospheric indices in 16 M0 to M2 dwarfs.


Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs

Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs

We perform a study of stellar flares for the 24,809 stars observed with 2 minute cadence during the first two months of the TESS mission.


Breezing Through The Space Environment of Barnard's Star b

Breezing Through The Space Environment of Barnard's Star b

A physically realistic stellar wind model based on Alfvén wave dissipation has been used to simulate the wind from Barnard's Star and to calculate the conditions at the location of its recently discovered planetary companion.


Kepler-730: A Hot Jupiter System with a Close-in, Transiting, Earth-sized Planet

Kepler-730: A Hot Jupiter System with a Close-in, Transiting, Earth-sized Planet

Kepler-730 is a planetary system hosting a statistically validated hot Jupiter in a 6.49-day orbit and an additional transiting candidate in a 2.85-day orbit.


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.



Top stories from February.