[astro-ph.EP] Aims: Our goal is to test and compare transit search methodologies, and provide recommendations as to the best practices to be implemented by the upcoming ESA PLATO mission, in […]
transit photometry
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Precise Mass And Radius Determination For Two New And One Known Neptune-sized Planets Around G Dwarf Hosts
As part of the KESPRINT collaboration, we present the discovery and characterization of three exoplanets in the sub-Neptune to super-Neptune regime, spanning key regions of the exo-Neptunian landscape.
Posted inAriel Mission, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
De-jittering Ariel: An Optimized Algorithm
The European Space Agency’s Ariel mission, scheduled for launch in 2029, aims to conduct the first large-scale survey of atmospheric spectra of transiting exoplanets.
![First image of the AO prototype ‘COME–ON’ system taken at 1.52 m telescope of the Observatoire de Haute Provence. γ2 And (a binary star with a 0.5′′ separation) was observed in K band [50]. -- astro-ph.IM](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/01/High-Contrast-Imaging.png?resize=1200%2C719&ssl=1)
Posted inAstronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Status Report
High-Contrast Imaging: Hide and Seek with Exoplanets
So far, most of the about 5,700 exoplanets have been discovered mainly with radial velocity and transit methods. These techniques are sensitive to planets in close orbits, not being able […]
Posted inAstrogeology, Exoplanets, -moons, -comets, Icy Worlds, Imaging & Spectroscopy, Status Report
OrCAS: Origins, Compositions, and Atmospheres of Sub-neptunes. I. Survey Definition
Sub-Neptunes – volatile-rich exoplanets smaller than Neptune – are intrinsically the most common type of planet known.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
TOI-757 b: An Eccentric Transiting Mini-Neptune On Aa 17.5-d Orbit
We report the spectroscopic confirmation and fundamental properties of TOI-757 b, a mini-Neptune on a 17.5-day orbit transiting a bright star (V=9.7 mag) discovered by the TESS mission. We acquired […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc
We report the discovery of the transiting planet GJ 238 b, with a radius of 0.566±0.014 R⊕ (1.064±0.026 times the radius of Mars) and an orbital period of 1.74 day.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The Open-source Sunbather Code: Modeling Escaping Planetary Atmospheres And Their Transit Spectra
Atmospheric escape is thought to significantly influence the evolution of exoplanets, especially for sub-Jupiter planets on short orbital periods. Theoretical models predict that hydrodynamic escape could erode the atmospheres of […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Singular Spectrum Analysis of Exoplanetary Transits
Transit photometry is currently the most efficient and sensitive method for detecting extrasolar planets (exoplanets) and a large majority of confirmed exoplanets have been detected with this method.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Precise Characterisation Of HD 15337 With CHEOPS: A Laboratory For Planet Formation And Evolution
We aim to constrain the internal structure and composition of HD 15337 b and c, two short-period planets situated on opposite sides of the radius valley, using new transit photometry […]