Extrasolar Planets


Stellar Parameters and Chemical Abundances of 223 Evolved Stars With and Without Planets

Stellar Parameters and Chemical Abundances of 223 Evolved Stars With and Without Planets

We present fundamental stellar parameters and chemical abundances for a sample of 86 evolved stars with planets and for a control sample of 137 stars without planets.


From Sub-Neptunes to Super-Earths: The Search for Habitable Worlds

From Sub-Neptunes to Super-Earths: The Search for Habitable Worlds

During a live Google Hangout, three astrophysicists -- Zachory Berta-Thompson, Bruce Macintosh and Marie-Eve Naud -- discussed the huge variety of planets discovered so far, how close we are to being able to see other Earth-like planets, and all that remains unknown.


Accretion and Differentiation of the Terrestrial Planets

Accretion and Differentiation of the Terrestrial Planets

In order to test planetary accretion and differentiation scenarios, we integrated a multistage core-mantle differentiation model with N-body accretion simulations.


Hubble Maps Temperature and Water Vapor on an Exoplanet

Hubble Maps Temperature and Water Vapor on an Exoplanet Video in Story

A team of scientists using NASA's Hubble Space Telescope has made the most detailed global map yet of the glow from a planet orbiting another star, revealing secrets of air temperatures and water.


Formation of Close in Super-Earths and Mini-Neptunes

Formation of Close in Super-Earths and Mini-Neptunes

Recent observations by the Kepler space telescope have led to the discovery of more than 4000 exoplanet candidates consisting of many systems with Earth- to Neptune-sized objects that reside well inside the orbit of Mercury, around their respective host stars.


Geothermal Heating Enhances Atmospheric Asymmetries on Synchronously Rotating Planets

Geothermal Heating Enhances Atmospheric Asymmetries on Synchronously Rotating Planets

Earth-like planets within the liquid water habitable zone of M type stars may evolve into synchronous rotators.


Hubble Search for a Sub-Earth-Sized Exoplanet in the GJ 436 System

Hubble Search for a Sub-Earth-Sized Exoplanet in the GJ 436 System

The detection of small planets orbiting nearby stars is an important step towards the identification of Earth twins.


Transmission Spectral Properties of Clouds for Hot Jupiter Exoplanets

Transmission Spectral Properties of Clouds for Hot Jupiter Exoplanets

Clouds have an important role in the atmospheres of planetary bodies. It is expected that, like all the planetary bodies in our solar system, exoplanet atmospheres will also have substantial cloud coverage, and evidence is mounting for clouds in a number of hot Jupiters.


Highlights in the Study of Exoplanet Atmospheres

Highlights in the Study of Exoplanet Atmospheres

Exoplanets are now being discovered in profusion. However, to understand their character requires spectral models and data.


Discriminating Between Cloudy, Hazy and Clearsky Exoplanets Using Refraction

Discriminating Between Cloudy, Hazy and Clearsky Exoplanets Using Refraction

We propose a method to distinguish between cloudy, hazy and clearsky (free of clouds and hazes) exoplanet atmospheres that could be applicable to upcoming large aperture space and ground-based telescopes such as JWST and E-ELT.


Evolution of Exoplanets and their Parent Stars

Evolution of Exoplanets and their Parent Stars

Studying exoplanets with their parent stars is crucial to understand their population, formation and history. We review some of the key questions regarding their evolution with particular emphasis on giant gaseous exoplanets orbiting close to solar-type stars.


Clear Skies and Water Vapor on an Exoplanet

Clear Skies and Water Vapor on an Exoplanet

Astronomers using data from three of NASA's space telescopes -- Hubble, Spitzer and Kepler -- have discovered clear skies and steamy water vapor on a gaseous planet outside our solar system.


Characterizing Earth-like Planets Using Spectroscopy and High-Contrast Instruments

Characterizing Earth-like Planets Using Spectroscopy and High-Contrast Instruments

Future radial velocity, astrometric and direct imaging surveys will find nearby Earth-sized planets within the habitable zone (HZ) in the near future. How can we search for water and oxygen in those non-transiting planets?


Instrumentation for the Detection and Characterization of Exoplanets

Instrumentation for the Detection and Characterization of Exoplanets

In no other field of astrophysics has the impact of new instrumentation been as substantial as in the domain of exoplanets.


Maximizing the ExoEarth Candidate Yield from a Future Direct Imaging Mission

Maximizing the ExoEarth Candidate Yield from a Future Direct Imaging Mission

ExoEarth yield is a critical science metric for future exoplanet imaging missions. Here we estimate exoEarth candidate yield using single visit completeness for a variety of mission design and astrophysical parameters.


A Hot Super-Neptune With an Earth-sized Low-mass Companion

A Hot Super-Neptune With an Earth-sized Low-mass Companion

We report on the characterization of the Kepler-101 planetary system, thanks to a combined DE-MCMC analysis of Kepler data and forty radial velocities obtained with the HARPS-N spectrograph. This system was previously validated by Rowe et al. (2014) and is composed of a hot super-Neptune, Kepler-101b, and an Earth-sized planet, Kepler-101c.


Optimal Measures for Characterizing Water-rich Super-Earths

Optimal Measures for Characterizing Water-rich Super-Earths

The detection and atmospheric characterization of super-Earths is one of the major frontiers of exoplanetary science. Currently, extensive efforts are underway to detect molecules, particularly H2O, in super-Earth atmospheres.


Water Vapor in the Spectrum of Extrasolar Planet HD 189733b: 2. The eclipse

Water Vapor in the Spectrum of Extrasolar Planet HD 189733b: 2. The eclipse

Spectroscopic observations of exoplanets are crucial to infer the composition and properties of their atmospheres. HD 189733b is one of the most extensively studied exoplanets and is a corner stone for hot Jupiter models.


First Evidence for Water Ice Clouds Outside Our Solar System

First Evidence for Water Ice Clouds Outside Our Solar System Video in Story

A team of scientists led by Carnegie's Jacqueline Faherty has discovered the first evidence of water ice clouds on an object outside of our own Solar System.


Effects of XUV Radiation on Circumbinary Planets

Effects of XUV Radiation on Circumbinary Planets

Several circumbinary planets have recently been discovered. The orbit of a planet around a binary stellar system poses several dynamic constraints.



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