Biosignatures & Paleobiology

Vegetation Of Planet Earth: Researchers Publish Unique Database As Open Access

Vegetation Of Planet Earth: Researchers Publish Unique Database As Open Access

It's a treasure trove of data: the global geodatabase of vegetation plots "sPlotOpen" is now freely accessible. It contains data on vegetation from 114 countries and from all climate zones on Earth.

Astrochemistry

Discovery Of Interstellar Glycine In The Hot Molecular Core G10.47+0.03

Discovery Of Interstellar Glycine In The Hot Molecular Core G10.47+0.03

Amino acids are the essential keys in chemistry that contribute to the study of the formation of life. The complex organic molecule glycine (NH2CH2COOH) is the simplest amino acid that has been investigated in the interstellar medium for a long period to search for a potential connection between the Universe and the origin of life.

Extrasolar Planets

Nightside Radio Could Help Reveal Exoplanet Details

Nightside Radio Could Help Reveal Exoplanet Details

We can't detect them yet, but radio signals from distant solar systems could provide valuable information about the characteristics of their planets.

TRAPPIST-1

Non-detection Of Helium In The Upper Atmospheres Of TRAPPIST-1b, e and f

Non-detection Of Helium In The Upper Atmospheres Of TRAPPIST-1b, e and f

We obtained high-resolution spectra of the ultra-cool M-dwarf TRAPPIST-1 during the transit of its planet `b' using two high dispersion near-infrared spectrographs, IRD instrument on the Subaru 8.2m telescope and HPF instrument on the 10m Hobby-Eberly Telescope.

Moons and Icy Worlds

The Geographic Distribution Of Dense-phase O2 On Ganymede

The Geographic Distribution Of Dense-phase O2 On Ganymede

Ground-based spectroscopy of Ganymede's surface has revealed the surprising presence of dense-phase molecular oxygen (O2) via weak absorptions at visible wavelengths. To date, the state and stability of this O2 at the temperatures and pressures of Ganymede's surface are not understood.

Moons and Icy Worlds

An Analytic Solution For Evaluating The Magnetic Field Induced From An Arbitrary, Asymmetric Ocean World

An Analytic Solution For Evaluating The Magnetic Field Induced From An Arbitrary, Asymmetric Ocean World

Magnetic investigations of icy moons have provided some of the most compelling evidence available confirming the presence of subsurface, liquid water oceans.

Extrasolar Planets

Detection of Aerosols at Microbar Pressures in an Exoplanet Atmosphere

Detection of Aerosols at Microbar Pressures in an Exoplanet Atmosphere

Formation of hazes at microbar pressures has been explored by theoretical models of exoplanet atmospheres to explain Rayleigh scattering and/or featureless transmission spectra, however observational evidence of aerosols in the low pressure formation environments has proved elusive.

Extrasolar Planets

Polarimetric Signature of Ocean as Detected by Near-Infrared Earthshine Observations

Polarimetric Signature of Ocean as Detected by Near-Infrared Earthshine Observations

Context. The discovery of an extrasolar planet with an ocean has crucial importance in the search for life beyond Earth.

Extrasolar Planets

The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution

The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution

Since planet occurrence and primordial atmospheric retention probability increase with period, the occurrence-weighted median planets discovered by transit surveys may bear little resemblance to the low-occurrence, short-period planets sculpted by atmospheric escape ordinarily used to calibrate mass--radius relations and planet formation models.

Extrasolar Planets

Generic Models for Disk-Resolved and Disk-Integrated Phase Dependent Linear Polarization of Light Reflected from Exoplanets

Generic Models for Disk-Resolved and Disk-Integrated Phase Dependent Linear Polarization of Light Reflected from Exoplanets

Similar to the case of solar system planets, reflected starlight from exoplanets is expected to be polarized due to atmospheric scattering and the net disk integrated polarization should be non-zero owing to the asymmetrical illumination of the planetary disk.

Titan

Optimisation of a Hydrodynamic SPH-FEM Model for a Bioinspired Aerial-aquatic Spacecraft on Titan

Optimisation of a Hydrodynamic SPH-FEM Model for a Bioinspired Aerial-aquatic Spacecraft on Titan

Titan, Saturn's largest moon, supports a dense atmosphere, numerous bodies of liquid on its surface, and as a richly organic world is a primary focus for understanding the processes that support the development of life.

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