![Stability map of the TOI-2211 system in the (Ωc , Ic) plane for the outer planet candidate TOI-2211.02. All other orbital parameters were fixed to the nominal solution from Table A.4. The colour scale shows the adopted stability indicator, with blue regions corresponding to stable configurations and red regions to unstable configurations. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Searching-for.png?resize=1200%2C719&ssl=1)
[astro-ph.EP] Small exoplanets on close-in orbits are exposed to high levels of stellar irradiation, which can effectively remove low-mass primordial H/He envelopes through atmospheric escape.
super-Earth
![D.2: Transit signals recovery analysis in the TESS light curve of TOI-210. TOI-210 b is shown in gold at its period of 9.01 days. Candidate planets at 2.15 and 3.76 days tentatively detected in the NIRPS RVs are indicated as lower limits, with arrows extending from minimum (iron density) to realistic (Earth density) radii based on their minimum masses. The expected transit depths fall within the TESS sensitivity, suggesting that if these RV signals are planets, they are unlikely to be transiting. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/A-temperate.png?resize=1200%2C713&ssl=1)
Posted inExoplanets, -moons, -comets
A Temperate Sub-Neptune Transiting The M4 Dwarf TOI-210 Identified By NIRPS And TESS — Uncovering Hidden M-dwarf Planetary Systems In The Near-infrared
[astro-ph.EP] Super-Earths and sub-Neptunes dominate the exoplanet population, yet their compositions, formation mechanisms, and capability of retaining atmospheres remain poorly understood. M-type stars offer a unique opportunity to investigate these […]
Posted inExoplanets, -moons, -comets
Mass Constraints For The K2-223 System Planets: An Ultra-short-period sub-Earth, A Short-period Super-Earth, And A Tentative Long-period Giant Planet
[astro-ph.EP] We present mass constraints of two short-period, terrestrial-sized planets transiting K2-223, based on high-precision radial velocity measurements from HARPS-N and ESPRESSO, as well as a tentative indication of an […]
Posted inExoplanets, -moons, -comets
Constraining The Lives And Times Of Exoplanets Through Evolutionary Bayesian Retrievals
[astro-ph.EP] Static retrieval frameworks are leading tools for interpreting exoplanet observations, yet time-independent modelling leaves them prone to degeneracy and unable to resolve exoplanets’ histories.
Posted inHabitable Zones
The Expected Yield Of Venus Zone Terrestrial Planets From PLATO
[astro-ph.EP] The characterization of terrestrial exoplanets and the conditions that lead to divergent climate outcomes is a primary goal of exoplanetary science.
![Reflation events (red) occur across a range of ages and with different magnitudes across the evolution of irradiated super-Earths. The plot shows the normalised bulk density evolution of individual simulations, versus the time elapsed since planet formation. The red lines indicate cases where a reflation event occurs, while blue lines indicate those where it does not occur. The evolution tracks that end with a dot indicate the planet has reached an airless state and complete atmospheric erosion by hydrodynamic escape has taken place. The evolution of the two select cases for Figure 1 are highlighted and denoted with a R and D. These cases illustrate in more detail a representative reflation (red) and deflation case (blue). -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Reflation.png?resize=1200%2C717&ssl=1)
Posted inAstrogeology
Reflation: Redox-driven Atmospheric Inflation As Tracer Of Super-Earth Geochemistry
[astro-ph.EP] We demonstrate that the redox-sensitivity of mantle outgassing can trigger transient episodes of atmospheric re-inflation in highly irradiated and geochemically-reduced super-Earths, a mechanism we term reflation.
![Detection map of our sample (excluding system with inner giant planets). Red dots represent the known planets, including the new candidates discussed in Section 6.3. [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/The-GAPS-Programme-.png?resize=1200%2C720&ssl=1)
Posted inExoplanets, -moons, -comets
The GAPS Programme with HARPS-N at TNG LXXVII. Occurrence Rates Of Small Close-in Planets In The Presence Of Cold Jupiters
[astro-ph.EP] Context. The architecture of our Solar System, with inner small planets (ISPs) and outer giants, may or may not be common. Understanding whether a correlation exists between ISPs and […]
![Geometry of the LTT 3780 planetary system at the time of our radio technosignature observations. The left panel shows the sky-plane (X–Y) view as seen from Earth, while the right panel shows the top-down (X–Z) view of the system. The orbits of planets b (blue) and c (green) are shown relative to the host star (yellow). Our observations from the ATA, mentioned in Table 1 on 5th November 2025, were timed to coincide with a planet–planet occultation (PPO), when planet b passes behind planet c along the line of sight, providing a unique configuration to search for radio technosignatures during mutual planetary alignment.-- [astro-ph.IM]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/A-Search-For.png?resize=1200%2C719&ssl=1)
Posted inSETI & Technosignatures
A Search For Narrowband Technosignatures From LTT 3780 With The Allen Telescope Array And The Karl G. Jansky Very Large Array
[astro-ph.IM] The LTT3780 system hosts two known exoplanets-LTT3780b, a rocky super-Earth, and LTT3780c, a temperate sub-Neptune-orbiting a nearby M dwarf on opposite sides of the radius valley. LTT3780c has been […]