The habitability of a planet is influenced by both its parent star and the properties of its local stellar neighborhood. Potential threats to habitability from the local stellar environment mainly […]
The continuing exploration of neighboring planetary systems is providing deeper insights into the relative prevalence of various system architectures, particularly with respect to the solar system.
We present an analysis of adaptive optics (AO) images from the Keck-I telescope of the microlensing event MOA-2011-BLG-262. The original discovery paper by Bennett et al. 2014 reports two distinct […]
![[C/Fe], [N/Fe], and [O/Fe] abundances and C/O and N/O ratios as functions of [Fe/H] for observed dwarfs (left panel) and giants (right panel). Thin disc planet-hosting stars are represented by green circles, while pink circles indicate stars from the thick disc. Circles filled with both colours represent "in between stars" to thin and thick discs. The (coloured) diamond symbols represent the planets-hosts from Tautvaišiene et al. ˙ (2022). The comparison sample results are taken from Stonkute et al. (2020); Tautvaišien ˙ e et al. (2022) and indicated by empty grey squares (thin ˙ disc) and triangles (thick disc). -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/10/Chemical-Composition-of-Planetary-Hosts.png?resize=1200%2C720&ssl=1)
Accurate atmospheric parameters and chemical composition of planet-hosting stars are crucial for characterising exoplanets and understanding their formation and evolution.
NASA’s Hubble Space Telescope and New Horizons spacecraft simultaneously set their sights on Uranus recently, allowing scientists to make a direct comparison of the planet from two very different viewpoints. […]
Modeling based on differentiable programming holds great promise for astronomy, as it can employ techniques such as Hamiltonian Monte Carlo, gradient-based optimization, and other machine learning techniques.
When it is solicited, D.19 Habitable Worlds Observatory System Technology Demonstrations and Mission Architecture Studies (HWOTAS) will seek industry-led proposals to carry out (1) system-level critical technology demonstrations for ultra-stable […]
The Milky way Galaxy is brimming with free-floating objects, including stars, planets and planetesimals. For the purpose of this chapter, we define a free-floating object as a solid body that […]
Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear […]
The planetary population synthesis method aims at comprehensively testing planet formation theories against observational evidence and providing theoretical sets of planets to help interpret observations and inform instrument development.
