Extrasolar Planets


Dust and Polycyclic Aromatic Hydrocarbon in the Pre-Transitional Disk around HD 169142

Dust and Polycyclic Aromatic Hydrocarbon in the Pre-Transitional Disk around HD 169142

The pre-transitional disk around the Herbig Ae star HD 169142 shows a complex structure of possible ongoing planet formation in dust thermal emission from the near infrared (IR) to millimeter wavelength range.


Evolved Stars and the Origin of Abundance Trends in Planet Hosts

Evolved Stars and the Origin of Abundance Trends in Planet Hosts

Tentative evidence that the properties of evolved stars with planets may be different from what we know for MS hosts has been recently reported.


Terrestrial Planets Across Space and Time

Terrestrial Planets Across Space and Time

The study of cosmology, galaxy formation and exoplanetary systems has now advanced to a stage where a cosmic inventory of terrestrial planets may be attempted.


Evolution of Stellar Rotation and Hydrogen Atmospheres of Habitable-zone Terrestrial Planets

Evolution of Stellar Rotation and Hydrogen Atmospheres of Habitable-zone Terrestrial Planets

Terrestrial planets formed within gaseous protoplanetary disks can accumulate significant hydrogen envelopes.


Detailed Chemical Composition of Terrestrial Planet Host Kepler-10

Detailed Chemical Composition of Terrestrial Planet Host Kepler-10

Chemical abundance studies of the Sun and solar twins have demonstrated that the solar composition of refractory elements is depleted when compared to volatile elements, which could be due to the formation of terrestrial planets.


Habitability of Terrestrial-Mass Planets in the HZ of M Dwarfs: H/He-Dominated Atmospheres

Habitability of Terrestrial-Mass Planets in the HZ of M Dwarfs: H/He-Dominated Atmospheres

The ubiquity of M dwarfs, combined with the relative ease of detecting terrestrial-mass planets around them, has made them prime targets for finding and characterising planets in the "Habitable Zone" (HZ).


Asteroid Flux Towards Circumprimary Habitable Zones in Binary Star Systems: Dynamics

Asteroid Flux Towards Circumprimary Habitable Zones in Binary Star Systems: Dynamics

Secular and mean motion resonances (hearafter MMR) are effective perturbations to shape planetary systems.


Effects of Dynamical Evolution of Giant Planets on the Delivery of Atmophile Elements During Terrestrial Planet Formation

Effects of Dynamical Evolution of Giant Planets on the Delivery of Atmophile Elements During Terrestrial Planet Formation

In this paper, we explore how the compositions of terrestrial planets are affected by dynamical evolution of giant planets.


Super-Earth Atmospheres: Self-Consistent Gas Accretion and Retention

Super-Earth Atmospheres: Self-Consistent Gas Accretion and Retention

Some recently discovered short-period Earth to Neptune sized exoplanets (super Earths) have low observed mean densities which can only be explained by voluminous gaseous atmospheres.


Measurements of Water Surface Snow Lines in Classical Protoplanetary Disks

Measurements of Water Surface Snow Lines in Classical Protoplanetary Disks

We present deep Herschel-PACS spectroscopy of far-infrared water lines from a sample of four protoplanetary disks around solar-mass stars, selected to have strong water emission at mid-infrared wavelengths.


Nearby Star Hosts Planet in its Habitable Zone

Nearby Star Hosts Planet in its Habitable Zone Video in Story

The planet, more than four times the mass of the Earth, is one of three that the team detected around a red dwarf star called Wolf 1061.


Life on Other Planets? Perhaps with a Little Help

Life on Other Planets? Perhaps with a Little Help

Life on other planets? A recent study by UNLV astrophysicist Jason Steffen is shedding new light on this persistently challenging question.


Dynamical Considerations for Life in Multihabitable Planetary Systems

Dynamical Considerations for Life in Multihabitable Planetary Systems

Inspired by the close-proximity pair of planets in the Kepler-36 system, we consider two effects that may have important ramifications for the development of life in similar systems where a pair of planets may reside entirely in the habitable zone of the hosting star.


Exploring the Inner Edge of the Habitable Zone with Fully Coupled Oceans

Exploring the Inner Edge of the Habitable Zone with Fully Coupled Oceans

Rotation in planetary atmospheres plays an important role in regulating atmospheric and oceanic heat flow, cloud formation and precipitation.


A Proposal for Climate Stability on H2-greenhouse Planets

A Proposal for Climate Stability on H2-greenhouse Planets

A terrestrial planet in an orbit far outside of the standard habitable zone could maintain surface liquid water as a result of H2-H2 collision-induced absorption by a thick H2 atmosphere.


Radiation Blasts Leave Most Earth-like Planet Uninhabitable

Radiation Blasts Leave Most Earth-like Planet Uninhabitable

The most Earth-like planet could have been made uninhabitable by vast quantities of radiation, new research led by the University of Warwick research has found.


Water On - and In - Terrestrial Planets

Water On - and In - Terrestrial Planets

Earth has a unique surface character among Solar System worlds. Not only does it harbor liquid water, but also large continents.


Atmospheric Effects of Stellar Cosmic Rays on Earth-like Exoplanets Orbiting M-dwarfs

Atmospheric Effects of Stellar Cosmic Rays on Earth-like Exoplanets Orbiting M-dwarfs

M-dwarf stars are generally considered favourable for rocky planet detection. However, such planets may be subject to extreme conditions due to possible high stellar activity.


A Quantitative Criterion for Defining Planets

A Quantitative Criterion for Defining Planets

A simple metric can be used to determine whether a planet or exoplanet can clear its orbital zone during a characteristic time scale, such as the lifetime of the host star on the main sequence.


Physical and Chemical Properties of the Planets Around HR8799

Physical and Chemical Properties of the Planets Around HR8799

The system of four planets around HR8799 offers a unique opportunity to probe the physics and chemistry at play in the atmospheres of self-luminous young (~30 Myr) planets.



Top stories from February.