Extrasolar Planets

Planets Of Binary Stars As Possible Homes For Alien Life

Planets Of Binary Stars As Possible Homes For Alien Life

Nearly half of Sun-size stars are binary. According to University of Copenhagen research, planetary systems around binary stars may be very different from those around single stars. This points to new targets in the search for extraterrestrial life forms.

Fossils

Discovery Of 'Ghost' Fossils Reveals Plankton Resilience To Past Global Warming Events

Discovery Of 'Ghost' Fossils Reveals Plankton Resilience To Past Global Warming Events

An international team of scientists from UCL (University College London), the Swedish Museum of Natural History, Natural History Museum (London) and the University of Florence have found a remarkable type of fossilisation that has remained almost entirely overlooked until now.

Enceladus

Particle Deposition On The Saturnian Satellites From Ephemeral Cryovolcanism On Enceladus

Particle Deposition On The Saturnian Satellites From Ephemeral Cryovolcanism On Enceladus

The geologically active south pole of Enceladus generates a plume of micron-sized particles, which likely form Saturn's tenuous E-ring extending from the orbit of Mimas to Titan.

Extrasolar Planets

The Need For A Public Forecast Of Stellar Activity To Optimise Exoplanet Radial Velocity Detections And Transmission Spectroscopy

The Need For A Public Forecast Of Stellar Activity To Optimise Exoplanet Radial Velocity Detections And Transmission Spectroscopy

Advances in high-precision spectrographs have paved the way for the search for an Earth analogue orbiting a Sun-like star within its habitable zone.

Venus

Venus As An Exoplanet: I. An Initial Exploration Of The 3-D Energy Balance For A CO2 Exoplanetary Atmosphere Around An M-Dwarf Star

Venus As An Exoplanet: I. An Initial Exploration Of The 3-D Energy Balance For A CO2 Exoplanetary Atmosphere Around An M-Dwarf Star

The chemical evolution of an exoplanetary Venus-like atmosphere is dependent upon the ultraviolet to near ultraviolet (FUV-NUV) radiation ratio from the parent star, the balance between CO2 photolysis and recombination via reactions that depend on the water abundance, and various catalytic chemical cycles.

Extrasolar Planets

Trends In Silicates In The β Pictoris Disk

Trends In Silicates In The β Pictoris Disk

While beta Pic is known to host silicates in ring-like structures, whether the properties of these silicate dust vary with stellocentric distance remains an open question.

Extrasolar Planets

Pandora: A Fast Open-source Exomoon Transit Detection Algorithm

Pandora: A Fast Open-source Exomoon Transit Detection Algorithm

We present Pandora, a new software to model, detect, and characterize transits of extrasolar planets with moons in stellar photometric time series.

Space Weather

Space Weather-driven Variations in Lyα Absorption Signatures of Exoplanet Atmospheric Escape: MHD Simulations and the Case of AU Mic b

Space Weather-driven Variations in Lyα Absorption Signatures of Exoplanet Atmospheric Escape: MHD Simulations and the Case of AU Mic b

We simulate the space environment around AU Microscopii b and the interaction between the magnetized stellar wind with a planetary atmospheric outflow for ambient stellar wind conditions and Coronal Mass Ejection (CME) conditions.

Microbiology

830 Million Year Old Microorganisms In Primary Fluid Inclusions In Halit

830 Million Year Old Microorganisms In Primary Fluid Inclusions In Halit

Primary fluid inclusions in bedded halite from the 830-m.y.-old Browne Formation of
central Australia contain organic solids and liquids, as documented with transmitted light and ultraviolet-visible (UV-vis) petrography.

Biosignatures & Paleobiology

The Futility of Exoplanet Biosignatures

The Futility of Exoplanet Biosignatures

The ultimate goal of astrobiology is to determine the distribution and diversity of life in the universe. But as the word "biosignature" suggests, what will be detected is not life itself, but an observation implicating a particular process associated with living systems.

Panspermia

Transfer Of Rocks Between Planetary Systems: Panspermia Revisited

Transfer Of Rocks Between Planetary Systems: Panspermia Revisited

Motivated by the recent discovery of interstellar objects passing through the solar system, and by recent developments in dynamical simulations, this paper reconsiders the likelihood for life bearing rocks to be transferred from one planetary system to another.

More top stories from May.