Extrasolar Planets


Multi-orbital-phase And Multi-band Characterization Of Exoplanetary Atmospheres With Reflected Light Spectra

Multi-orbital-phase And Multi-band Characterization Of Exoplanetary Atmospheres With Reflected Light Spectra

Direct imaging of widely separated exoplanets from space will obtain their reflected light spectra and measure atmospheric properties.


Estimating the Ultraviolet Emission of M dwarfs with Exoplanets from Ca II and Hα

Estimating the Ultraviolet Emission of M dwarfs with Exoplanets from Ca II and Hα

M dwarf stars are excellent candidates around which to search for exoplanets, including temperate, Earth-sized planets. To evaluate the photochemistry of the planetary atmosphere, it is essential to characterize the UV spectral energy distribution of the planet's host star.


Utilizing a Database of Simulated Geometric Albedo Spectra for Photometric Characterization of Rocky Exoplanet Atmospheres

Utilizing a Database of Simulated Geometric Albedo Spectra for Photometric Characterization of Rocky Exoplanet Atmospheres

In anticipation of future flagship missions focused on the goal of achieving direct imaging of rocky exoplanets, we have developed a database of models to help the community examine the potential spectral characteristics of a broad range of rocky planet atmospheres.


The Effects Of Granulation And Supergranulation On Earth-mass Planet Detectability In The Habitable Zone Around F6-K4 Stars

The Effects Of Granulation And Supergranulation On Earth-mass Planet Detectability In The Habitable Zone Around F6-K4 Stars

The detectability of exoplanets and the determination of their projected mass in radial velocity are affected by stellar magnetic activity and photospheric dynamics.


Haze Formation in Warm H2-rich Exoplanet Atmospheres

Haze Formation in Warm H2-rich Exoplanet Atmospheres

New observing capabilities coming online over the next few years will provide opportunities for characterization of exoplanet atmospheres. However, clouds/hazes could be present in the atmospheres of many exoplanets, muting the amplitude of spectral features.


Isotopically Distinct Terrestrial Planets Via Local Accretion

Isotopically Distinct Terrestrial Planets Via Local Accretion

Combining isotopic constraints from meteorite data with dynamical models of planet formation proves to be advantageous in identifying the best model for terrestrial planet formation.


Detection Of Ten New Planets, Three Planet Candidates, And Confirmation Of Three Planets Around Eleven Nearby M Dwarfs

Detection Of Ten New Planets, Three Planet Candidates, And Confirmation Of Three Planets Around Eleven Nearby M Dwarfs

Earth-sized planets in the habitable zones of M dwarfs are good candidates for the study of habitability and detection of biosignatures.


Quantifying The Information Impact Of Future Searches For Exoplanetary Biosignatures

Quantifying The Information Impact Of Future Searches For Exoplanetary Biosignatures

One of the major goals for astronomy in the next decades is the remote search for biosignatures (i.e.\ the spectroscopic evidence of biological activity) in exoplanets.


Optical Transmission Spectroscopy of the Terrestrial Exoplanet LHS 3844b from 13 Ground-Based Transit Observations

Optical Transmission Spectroscopy of the Terrestrial Exoplanet LHS 3844b from 13 Ground-Based Transit Observations

Atmospheric studies of spectroscopically accessible terrestrial exoplanets lay the groundwork for comparative planetology between these worlds and the Solar System terrestrial planets.


Effects of Flux Variation on the Surface Temperatures of Earth-like Circumbinary Planets

Effects of Flux Variation on the Surface Temperatures of Earth-like Circumbinary Planets

The Kepler Space telescope has uncovered around thirteen circumbinary planets (CBPs) that orbit a pair of stars and experience two sources of stellar flux.


LOUPE: Observing Earth From The Moon To Prepare For Detecting life On Earth-like Exoplanets

LOUPE: Observing Earth From The Moon To Prepare For Detecting life On Earth-like Exoplanets

LOUPE, the Lunar Observatory for Unresolved Polarimetry of the Earth, is a small, robust spectro-polarimeter with a mission to observe the Earth as an exoplanet. Detecting Earth-like planets in stellar habitable zones is one of the key challenges of modern exoplanetary science.


Colors of an Earth-like Exoplanet - Temporal Flux And Polarization Signals Of The Earth

Colors of an Earth-like Exoplanet - Temporal Flux And Polarization Signals Of The Earth

Understanding the total flux and polarization signals of Earth-like planets and their spectral and temporal variability is essential for the future characterization of such exoplanets.


Bayesian Dynamic Mapping of an Exo-Earth from Photometric Variability

Bayesian Dynamic Mapping of an Exo-Earth from Photometric Variability

Photometric variability of a directly imaged exo-Earth conveys spatial information on its surface and can be used to retrieve a two-dimensional geography and axial tilt of the planet (spin-orbit tomography).


The Habitable-zone Planet Finder Reveals A High Mass and a Low Obliquity for the Young Neptune K2-25b

The Habitable-zone Planet Finder Reveals A High Mass and a Low Obliquity for the Young Neptune K2-25b

Using radial-velocity data from the Habitable-zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5-dwarf host star in the 600-800MYr Hyades cluster.


A Lost World's Rediscovery Is A Step Towards Finding Habitable Planets

A Lost World's Rediscovery Is A Step Towards Finding Habitable Planets

The rediscovery of a lost planet could pave the way for the detection of a world within the habitable 'Goldilocks zone' in a distant solar system.


Could Mini-Neptunes Be Irradiated Ocean Planets?

Could Mini-Neptunes Be Irradiated Ocean Planets?

Many exoplanets known today are "super-Earths", with a radius 1.3 times that of Earth, and "mini-Neptunes", with 2.4 Earth radii.


The Influence Of Bulk Composition On Long-term Interior-atmosphere Evolution of Terrestrial Exoplanets

The Influence Of Bulk Composition On Long-term Interior-atmosphere Evolution of Terrestrial Exoplanets

Aims: The secondary atmospheres of terrestrial planets form and evolve as a consequence of interaction with the interior over geological time. We aim to quantify the influence of planetary bulk composition on interior--atmosphere evolution to aid the interpretation of future observations of terrestrial exoplanet atmospheres.


The Role of Clouds on the Depletion of Methane and Water Dominance in the Transmission Spectra of Irradiated Exoplanets

The Role of Clouds on the Depletion of Methane and Water Dominance in the Transmission Spectra of Irradiated Exoplanets

Observations suggest an abundance of water and paucity of methane in the majority of observed exoplanetary atmospheres. We isolate the effect of atmospheric processes to investigate possible causes.


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.



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