Extrasolar Planets


New Indexing and Surface Temperature Analysis of Exoplanets

New Indexing and Surface Temperature Analysis of Exoplanets

Study of exoplanets is the holy grail of present research in planetary sciences and astrobiology. Analysis of huge planetary data from space missions such as CoRoT and Kepler is directed ultimately at finding a planet similar to Earth\-the Earth's twin, and answering the question of potential exo-habitability.


Biological Fluorescence as a Temporal Biosignature for Flare Star Worlds

Biological Fluorescence as a Temporal Biosignature for Flare Star Worlds

Habitability for planets orbiting active stars has been questioned. Especially, planets in the Habitable Zone (HZ) of M-stars, like our closest star Proxima Centauri, experience temporal high-ultraviolet (UV) radiation.


The Habitability of Proxima Centauri b I: Evolutionary Scenarios

The Habitability of Proxima Centauri b I: Evolutionary Scenarios

We analyze the evolution of the potentially habitable planet Proxima Centauri b to identify environmental factors that affect its long-term habitability. We consider physical processes acting on size scales ranging between the galactic scale, the scale of the stellar system, and the scale of the planet's core.


Rocky Planet Found in Habitable Zone of Proxima Centauri

Rocky Planet Found in Habitable Zone of Proxima Centauri

An international team of astronomers including Carnegie's Paul Butler has found clear evidence of a planet orbiting Proxima Centauri, the closest star to our solar system.


Proxima Centauri as a Benchmark for Stellar Activity Indicators in the Near Infrared

Proxima Centauri as a Benchmark for Stellar Activity Indicators in the Near Infrared

A new generation of dedicated Doppler spectrographs will attempt to detect low-mass exoplanets around mid-late M stars at near infrared (NIR) wavelengths, where those stars are brightest and have the most Doppler information content.


Being In The Habitable Zone Is Not Enough

Being In The Habitable Zone Is Not Enough

The search for habitable, alien worlds needs to make room for a second "Goldilocks," according to a Yale University researcher.


Rocky Planet Formation: Quick and Neat

Rocky Planet Formation: Quick and Neat

We reconsider the commonly held assumption that warm debris disks are tracers of terrestrial planet formation. The high occurrence rate inferred for Earth-mass planets around mature solar-type stars based on exoplanet surveys (roughly 20%) stands in stark contrast to the low incidence rate (less than 2-3%) of warm dusty debris around solar-type stars during the expected epoch of terrestrial planet assembly (roughly 10 Myr).


Milankovitch Cycles of Terrestrial Planets in Binary Star Systems

Milankovitch Cycles of Terrestrial Planets in Binary Star Systems

The habitability of planets in binary star systems depends not only on the radiation environment created by the two stars, but also on the perturbations to planetary orbits and rotation produced by the gravitational field of the binary and neighbouring planets.


Venus-like Exoplanet Might Have Oxygen Atmosphere, But Not Life

Venus-like Exoplanet Might Have Oxygen Atmosphere, But Not Life

The distant planet GJ 1132b intrigued astronomers when it was discovered last year. Located just 39 light-years from Earth, it might have an atmosphere despite being baked to a temperature of around 450 degrees Fahrenheit. But would that atmosphere be thick and soupy or thin and wispy? New research suggests the latter is much more likely.


Tidal Heating of Young Super-Earth Atmospheres

Tidal Heating of Young Super-Earth Atmospheres

Short-period Earth to Neptune size exoplanets (super-Earths) with voluminous gas envelopes seem to be very common. These gas atmospheres are thought to have originated from the protoplanetary disk in which the planets were embedded during their first few Myr.


Revised Properties of Kepler M Dwarf Stars and Their Planets

Revised Properties of Kepler M Dwarf Stars and Their Planets

We classified the reddest (r-J> 2.2) stars observed by the NASA Kepler mission into main sequence dwarf or evolved giant stars and determined the properties of 4216 M dwarfs based on a comparison of available photometry with that of nearby calibrator stars, as well as available proper motions and spectra.


Identifying Planetary Biosignature Impostors

Identifying Planetary Biosignature Impostors

O2 and O3 have been long considered the most robust individual biosignature gases in a planetary atmosphere, yet multiple mechanisms that may produce them in the absence of life have been described.


Phase Changes in the Climate Dynamics of Tidally Locked Terrestrial Exoplanets

Phase Changes in the Climate Dynamics of Tidally Locked Terrestrial Exoplanets

We investigate 3D atmosphere dynamics for tidally locked terrestrial planets with an Earth-like atmosphere and irradiation for different rotation periods (Prot=1100 days) and planet sizes (RP=12REarth) with unprecedented fine detail.


HD 80606: Searching the Chemical Signature of Planet Formation

HD 80606: Searching the Chemical Signature of Planet Formation

Binary systems with similar components are ideal laboratories which allow several physical processes to be tested, such as the possible chemical pattern imprinted by the planet formation process.


Habitable Planet Catalog

Habitable Planet Catalog

Looking for another Earth? An international team of researchers has pinpointed which of the more than 4,000 exoplanets discovered by NASA's Kepler mission are most likely to be similar to our rocky home.


Lightning Climatology of Exoplanets and Brown Dwarfs Guided by Solar System Data

Lightning Climatology of Exoplanets and Brown Dwarfs Guided by Solar System Data

Clouds form on extrasolar planets and brown dwarfs where lightning could occur. Lightning is a tracer of atmospheric convection, cloud formation and ionization processes as known from the Solar System, and may be significant for the formation of prebiotic molecules.


Polarized Scattering and Biosignatures in Exoplanetary Atmospheres

Polarized Scattering and Biosignatures in Exoplanetary Atmospheres

Polarized scattering in planetary atmospheres is computed in the context of exoplanets. The problem of polarized radiative transfer is solved for a general case of absorption and scattering, while Rayleigh and Mie polarized scattering are considered as most relevant examples.


Exoplanet Atmospheric Chemistry on Paper

Exoplanet Atmospheric Chemistry on Paper

Normally computers speed up calculations. But with his new pen-and-paper formula Kevin Heng of the University of Bern gets his results thousands of times faster than using conventional computer codes.


Temperate Earth-sized Planets Transiting a Nearby Ultracool Dwarf Star

Temperate Earth-sized Planets Transiting a Nearby Ultracool Dwarf Star

Star-like objects with effective temperatures of less than 2,700 kelvin are referred to as ultracool dwarfs.


Night Side Cooling and Surface Friction Affect Climates of Tidally Locked Terrestrial Planets

Night Side Cooling and Surface Friction Affect Climates of Tidally Locked Terrestrial Planets

We investigate how night side cooling and surface friction impact surface temperatures and large scale circulation for tidally locked Earth-like planets.



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