Extrasolar Planets


Modons On Tidally Synchronised Extrasolar Planets

Modons On Tidally Synchronised Extrasolar Planets

We investigate modons on tidally synchronised extrasolar planets. Modons are highly dynamic, coherent flow structures composed of a pair of storms with opposite signs of vorticity.


Postulating Exoplanetary Habitability via a Novel Anomaly Detection Method

Postulating Exoplanetary Habitability via a Novel Anomaly Detection Method

A profound shift in the study of cosmology came with the discovery of thousands of exoplanets and the possibility of the existence of billions of them in our Galaxy. The biggest goal in these searches is whether there are other life-harbouring planets.


CARMENES Search For Exoplanets Around M Dwarfs

CARMENES Search For Exoplanets Around M Dwarfs

(Abridged) We characterize a series of neutral vanadium atomic absorption lines in the 800--910nm wavelength region of high signal-to-noise, high-resolution, telluric-corrected M-dwarf spectra from the CARMENES survey. Many of these lines are prominent and exhibit a distinctive broad and flat-bottom shape, which is a result of hyperfine structure (HFS).


A Multispecies Pseudoadiabat For Simulating Condensable-rich Exoplanet Atmospheres

A Multispecies Pseudoadiabat For Simulating Condensable-rich Exoplanet Atmospheres

Central stages in the evolution of rocky, potentially habitable planets may play out under atmospheric conditions with a large inventory of non-dilute condensable components. Variations in condensate retention and accompanying changes in local lapse rate may substantially affect planetary climate and surface conditions, but there is currently no general theory to effectively describe such atmospheres.


Leveraging Models to Constrain the Climates of Rocky Exoplanets

Leveraging Models to Constrain the Climates of Rocky Exoplanets

In recent years, numerical models that were developed for Earth have been adapted to study exoplanetary climates to understand how the broad range of possible exoplanetary properties affects their climate state.


On the Detection Of Exomoons Transiting Isolated Planetary-Mass Objects

On the Detection Of Exomoons Transiting Isolated Planetary-Mass Objects

All-sky imaging surveys have identified several dozen isolated planetary-mass objects (IPMOs), far away from any star. Here, we examine the prospects for detecting transiting moons around these objects.


The Pandora SmallSat: Multiwavelength Characterization of Exoplanets and their Host Stars

The Pandora SmallSat: Multiwavelength Characterization of Exoplanets and their Host Stars

Pandora is a SmallSat mission designed to study the atmospheres of exoplanets, and was selected as part of NASA's Astrophysics Pioneers Program.


Warm Terrestrial Planet With Half The Mass Of Venus Transiting A Nearby Star

Warm Terrestrial Planet With Half The Mass Of Venus Transiting A Nearby Star

The advent of a new generation of radial velocity instruments has allowed us to break the one Earth-mass barrier. We report a new milestone in this context with the detection of the lowest-mass planet measured so far using radial velocities: L 98-59 b, a rocky planet with half the mass of Venus.


A Rocky Exoplanet Has Just Half The Mass Of Venus

A Rocky Exoplanet Has Just Half The Mass Of Venus

A team of astronomers have used the European Southern Observatory's Very Large Telescope (ESO's VLT) in Chile to shed new light on planets around a nearby star, L 98-59, that resemble those in the inner Solar System. Amongst the findings are a planet with half the mass of Venus -- the lightest exoplanet ever to be measured using the radial velocity technique -- an ocean world, and a possible planet in the habitable zone.


Asymmetry and Variability in the Transmission Spectra of Tidally Locked Habitable Planets

Asymmetry and Variability in the Transmission Spectra of Tidally Locked Habitable Planets

Spatial heterogeneity and temporal variability are general features in planetary weather and climate, due to the effects of planetary rotation, uneven stellar flux distribution, fluid motion instability, etc.


The Keck Planet Imager and Characterizer: A Dedicated Single-mode Fiber Injection Unit For High Resolution Exoplanet Spectroscopy

The Keck Planet Imager and Characterizer: A Dedicated Single-mode Fiber Injection Unit For High Resolution Exoplanet Spectroscopy

The Keck Planet Imager and Characterizer (KPIC) is a purpose-built instrument to demonstrate new technological and instrumental concepts initially developed for the exoplanet direct imaging field.


ExoPlaSim: Extending the Planet Simulator for Exoplanets

ExoPlaSim: Extending the Planet Simulator for Exoplanets

The discovery of a large number of terrestrial exoplanets in the habitable zones of their stars, many of which are qualitatively different from Earth, has led to a growing need for fast and flexible 3D climate models, which could model such planets and explore multiple possible climate states and surface conditions.


Past, Present And Future Stars That Can See Earth As A Transiting Exoplanet

Past, Present And Future Stars That Can See Earth As A Transiting Exoplanet

In the search for life in the cosmos, transiting exoplanets are currently our best targets. In the search for life in the cosmos, transiting exoplanets are currently our best targets. With thousands already detected, our search is entering a new era of discovery with upcoming large telescopes that will look for signs of life in the atmospheres of transiting worlds.


Haziness Of Exoplanet Atmospheres Depends On Properties Of Aerosol Particles

Haziness Of Exoplanet Atmospheres Depends On Properties Of Aerosol Particles

Many exoplanets have opaque atmospheres, obscured by clouds or hazes that make it hard for astronomers to characterize their chemical compositions. A new study shows that haze particles produced under different conditions have a wide range of properties that can determine how clear or hazy a planet's atmosphere is likely to be.


Speckle Observations of TESS Exoplanet Host Stars. II. Stellar Companions at 1-1000 AU and Implications for Small Planet Detection

Speckle Observations of TESS Exoplanet Host Stars. II. Stellar Companions at 1-1000 AU and Implications for Small Planet Detection

We present high angular resolution imaging observations of 517 host stars of TESS exoplanet candidates using the `Alopeke and Zorro speckle cameras at Gemini North and South. The sample consists mainly of bright F, G, K stars at distances of less than 500 pc.


Radiative Rayleigh-Taylor Instability and the Structure of Clouds in Planetary Atmospheres

Radiative Rayleigh-Taylor Instability and the Structure of Clouds in Planetary Atmospheres

Clouds are expected to form in a wide range of conditions in the atmosphere of exoplanets given the large range of possible condensible species.


Nightside Radio Could Help Reveal Exoplanet Details

Nightside Radio Could Help Reveal Exoplanet Details

We can't detect them yet, but radio signals from distant solar systems could provide valuable information about the characteristics of their planets.


Detection of Aerosols at Microbar Pressures in an Exoplanet Atmosphere

Detection of Aerosols at Microbar Pressures in an Exoplanet Atmosphere

Formation of hazes at microbar pressures has been explored by theoretical models of exoplanet atmospheres to explain Rayleigh scattering and/or featureless transmission spectra, however observational evidence of aerosols in the low pressure formation environments has proved elusive.


Polarimetric Signature of Ocean as Detected by Near-Infrared Earthshine Observations

Polarimetric Signature of Ocean as Detected by Near-Infrared Earthshine Observations

Context. The discovery of an extrasolar planet with an ocean has crucial importance in the search for life beyond Earth.


The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution

The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution

Since planet occurrence and primordial atmospheric retention probability increase with period, the occurrence-weighted median planets discovered by transit surveys may bear little resemblance to the low-occurrence, short-period planets sculpted by atmospheric escape ordinarily used to calibrate mass--radius relations and planet formation models.



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