Extrasolar Planets


The Dynamic Proto-atmospheres Around Low-Mass Planets With Eccentric Orbits

The Dynamic Proto-atmospheres Around Low-Mass Planets With Eccentric Orbits

Protoplanets are able to accrete primordial atmospheres when embedded in the gaseous protoplanetary disk. The formation and structure of the proto-atmosphere are subject to the planet--disk environment and orbital effects.


Arid or Cloudy: Characterizing the Atmosphere of the Super-Earth 55 Cancri e Using High-Resolution Spectroscopy

Arid or Cloudy: Characterizing the Atmosphere of the Super-Earth 55 Cancri e Using High-Resolution Spectroscopy

The nearby super-Earth 55 Cnc e orbits a bright (V = 5.95 mag) star with a period of ~ 18 hours and a mass of ~ 8 Earth masses. Its atmosphere may be water-rich and have a large scale-height, though attempts to characterize it have yielded ambiguous results.


A Systematic Study of CO2 Planetary Atmospheres And Their Link To The Stellar Environment

A Systematic Study of CO2 Planetary Atmospheres And Their Link To The Stellar Environment

The Milky Way Galaxy is literally teeming with exoplanets; thousands of planets have been discovered, with thousands more planet candidates identified. Terrestrial-like planets are quite common around other stars, and are expected to be detected in large numbers in the future.


Obliquity Of An Earth-like Planet From Frequency Modulation Of Its Direct Imaged Lightcurve: Mock Analysis From General Circulation Model Simulation

Obliquity Of An Earth-like Planet From Frequency Modulation Of Its Direct Imaged Lightcurve: Mock Analysis From General Circulation Model Simulation

Direct-imaging techniques of exoplanets have made significant progress recently, and will eventually enable to monitor photometric and spectroscopic signals of earth-like habitable planets in the future.


A Mini-Neptune and a Venus-Zone Planet in the Radius Valley Orbiting the Nearby M2-dwarf TOI-1266: Validation with the Habitable-zone Planet Finder

A Mini-Neptune and a Venus-Zone Planet in the Radius Valley Orbiting the Nearby M2-dwarf TOI-1266: Validation with the Habitable-zone Planet Finder

We report on the validation of two planets orbiting the nearby (36pc) M2 dwarf TOI-1266 observed by the TESS mission.


Influence Of The Sun-like Magnetic Cycle On Exoplanetary Atmospheric Escape

Influence Of The Sun-like Magnetic Cycle On Exoplanetary Atmospheric Escape

Stellar high-energy radiation (X-ray and extreme ultraviolet, XUV) drives atmospheric escape in close-in exoplanets.


Retrieving Scattering Clouds And Disequilibrium Chemistry In The Atmosphere Of HR 8799e

Retrieving Scattering Clouds And Disequilibrium Chemistry In The Atmosphere Of HR 8799e

Clouds are ubiquitous in exoplanet atmospheres and represent a challenge for the model interpretation of their spectra. Complex cloud models are too numerically costly for generating a large number of spectra, while more efficient models may be too strongly simplified.


As Many As Six Billion Earth-like Planets In Our Galaxy, According To New Estimates

As Many As Six Billion Earth-like Planets In Our Galaxy, According To New Estimates

To be considered Earth-like, a planet must be rocky, roughly Earth-sized and orbiting Sun-like (G-type) stars. It also has to orbit in the habitable zones of its star--the range of distances from a star in which a rocky planet could host liquid water, and potentially life, on its surface.


Directly Imaged Exoplanets In Reflected Starlight. The Importance Of Knowing The Planet Radius

Directly Imaged Exoplanets In Reflected Starlight. The Importance Of Knowing The Planet Radius

We have investigated the information content in reflected-starlight spectra of exoplanets. We specify our analysis to Barnard's Star b candidate super-Earth, for which we assume a radius 0.6 times that of Neptune, an atmosphere dominated by H2-He, and a CH4 volume mixing ratio of 5⋅10−3.


Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-Size Exoplanet HD 106315 c

Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-Size Exoplanet HD 106315 c

We present a transmission spectrum for the Neptune-size exoplanet HD 106315 c from optical to infrared wavelengths based on transit observations from the Hubble Space Telescope/Wide Field Camera 3, K2, and Spitzer.


A 1.9R⊕ Transit Candidate In The Habitable Zone Of Kepler-160

A 1.9R⊕ Transit Candidate In The Habitable Zone Of Kepler-160

The Sun-like star Kepler-160 (KOI-456) has been known to host two transiting planets, Kepler-160 b and c, of which planet c shows substantial transit-timing variations (TTVs).


Oxidation of the Interiors of Carbide Exoplanets

Oxidation of the Interiors of Carbide Exoplanets

Astrophysical measurements have shown that some stars have sufficiently high carbon-to-oxygen ratios such that the planets they host would be mainly composed of carbides instead of silicates.


Alkaline Exospheres of Exoplanet Systems: Evaporative Transmission Spectra

Alkaline Exospheres of Exoplanet Systems: Evaporative Transmission Spectra

Hydrostatic equilibrium is an excellent approximation for the dense layers of planetary atmospheres where it has been canonically used to interpret transmission spectra of exoplanets.


The Occurrence Rate Of Exoplanets Orbiting Ultracool Dwarfs As Probed By K2

The Occurrence Rate Of Exoplanets Orbiting Ultracool Dwarfs As Probed By K2

With the discovery of a planetary system around TRAPPIST-1, there has been a surge of interest in ultracool dwarfs as potential planet hosts. Planetary systems around ultracool dwarfs represent our best chance of characterising temperate rocky-planet atmospheres with JWST.


Toward Complete Characterization: Prospects for Directly Imaging Transiting Exoplanets

Toward Complete Characterization: Prospects for Directly Imaging Transiting Exoplanets

High contrast direct imaging of exoplanets can provide many important observables, including measurements of the orbit, spectra that probe the lower layers of the atmosphere, and phase variations of the planet, but cannot directly measure planet radius or mass.


Ions in the Thermosphere of Exoplanets: Observable Constraints Revealed by Innovative Laboratory Experiments

Ions in the Thermosphere of Exoplanets: Observable Constraints Revealed by Innovative Laboratory Experiments

With the upcoming launch of space telescopes dedicated to the study of exoplanets, the Atmospheric Remote-Sensing Infrared Exoplanet Large-survey (ARIEL) and the James Webb Space Telescope (JWST), a new era is opening in the exoplanetary atmospheric explorations.


Radial-velocity Variations Due To Meridional Flows In The Sun And Solar-type Stars: Impact On Exoplanet Detectability

Radial-velocity Variations Due To Meridional Flows In The Sun And Solar-type Stars: Impact On Exoplanet Detectability

Stellar variability due to magnetic activity and flows at different spatial scales strongly impacts radial velocities. This variability is seen as oscillations, granulation, supergranulation, and meridional flows.


TOI-1338: TESS' First Transiting Circumbinary Planet

TOI-1338: TESS' First Transiting Circumbinary Planet

We report the detection of the first circumbinary planet found by TESS. The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30-minute cadence and in sectors 4 through 12 at two-minute cadence.


Earth-Size, Habitable Zone Planet Found Hidden in Early NASA Kepler Data

Earth-Size, Habitable Zone Planet Found Hidden in Early NASA Kepler Data

A team of transatlantic scientists, using reanalyzed data from NASA's Kepler space telescope, has discovered an Earth-size exoplanet orbiting in its star's habitable zone, the area around a star where a rocky planet could support liquid water.


Sulfur-driven Haze Formation in Warm CO2-rich Exoplanet Atmospheres

Sulfur-driven Haze Formation in Warm CO2-rich Exoplanet Atmospheres

Sulfur gases significantly affect the photochemistry of planetary atmospheres in our Solar System, and are expected to be important components in exoplanet atmospheres.



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