[astro-ph.IM] Nulling interferometry is one of the most promising techniques that is envisioned for the imaging and characterization of exoplanets in the mid-infrared for ground-based and space-based observatories. On the […]
Exoplanets, -moons, -comets
Posted inExoplanets, -moons, -comets
Atmospheric Retrieval Evidence For Water Isotopologue HDO On Exoplanet WASP-39b
[astro-ph.EP] Hydrogen-isotopologues are commonly used to trace the chemical processing and origin of hydrogen-bearing species throughout the Universe, however, their abundance remains unconstrained for extrasolar planets.
Posted inExoplanets, -moons, -comets
Dynamically Selected Mass-Radius Relationship For Low Mass Exoplanets
[astro-ph.EP] We study the mass-radius relationship of planets in multiplanet systems as a function of their dynamical architecture.
![Assuming the presence of two companions, the orbital evolution of the HD 216595 system for 500 years from the best-fit orbit: (a) orbits of the system, (b) the evolution of the semi-major axes, and (c) the evolution of the eccentricities. Blue color indicates the inner companion and black color is the outer companion. -- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/A-Search-for.png?resize=1200%2C652&ssl=1)
Posted inExoplanets, -moons, -comets
A Search For Exoplanets Around Northern Circumpolar Stars X. The Origin Of Radial Velocity Variations In The Evolved Star HD 216595
[astro-ph.SR] Detecting planetary companions around evolved stars, particularly asymptotic giant branch (AGB) stars, is challenging due to intrinsic stellar variability such as surface convection, pulsations, and mass loss, which can […]
Posted inExoplanets, -moons, -comets
New Exomoon Detection Challenges Cosmic Labels
[ESO] Observations made with the European Southern Observatory’s Very Large Telescope (ESO’s VLT) have revealed evidence for a moon-like object in the CD-35 2722 system. Unlike moons in our Solar […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry
Mapping Alien Continents: Achieving Optical VLBI For Exoplanet Imaging
[NIAC / NASA] The scientific goal of the proposed work will be reconstructing the image, i.e. resolving surface features, of an Earth-like exoplanet around a nearby star as seen in […]
![Orbital trajectories of two example scattering experiments. Left: An interaction that results in a free-floating planet-moon pair. Right: An interaction that results in a free-floating planet and a separate free-floating moon. The starting points of the bodies are indicated by the black dots. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Planet-moon.png?resize=1200%2C720&ssl=1)
Posted inStellar Cartography
Planet-moon Ejections In Close Stellar Encounters
[astro-ph.EP] Free-floating planet-moon pairs (FFPMs) may form when planetary systems experience close stellar encounters.
![Numerical computations corresponding to the candidate pattern in the H–alpha filter (λ0 = 656 nm), for the total flux (left) and the polarized flux (right). The background polarization signal has been subtracted from the latter. The decrease in spatial resolution due to the Earth’s atmosphere is not included. The planetary atmosphere is assumed to be horizontally homogeneous except for the gas density variations. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Planet-wide.png?resize=1200%2C711&ssl=1)
Posted inVenus
Planet-wide, Concentric Density Waves in Venus’s Upper Atmosphere Revealed through Polarimetry?
[astro-ph.EP] We report observations of faint (10−6), concentric, planet-wide rings in the polarized flux of sunlight that is reflected by Venus, obtained during a serendipitous, 36-minute run in 2010, with […]
Posted inStellar Cartography
TESS Photometry and Radial Velocity Analysis of the sub-Neptune Exoplanet π Mensae c and the Wider π Mensae Planetary System
[astro-ph.EP] Exoplanet characterization relies on precise measurements of planetary orbital and physical parameters. This is particularly important for planetary dynamics and atmospheric evolution, as orbital parameters help constrain system evolution, […]
Posted inExoplanets, -moons, -comets
Growing Planets Produce Extreme Dust Signatures
[astro-ph.EP] Collisions between planetary bodies are essential to the assembly of rocky planets like the Earth, but they are extremely difficult to observe. We therefore rely on indirect signatures of […]