![In top panels transits of TOI1408 b (left) and c (right) are shown along with their best fitting models (computed for one of likelihood maxima). In panels below the corresponding binned residuals and their uncertainties are plotted. Notice that there are a few occurrences when planets b and c transits partly overlapped with each other; in such a case all transit curves are plotted in the same graph. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/TOI-1408.png?resize=1200%2C720&ssl=1)
[astro-ph.EP] We perform a self-consistent analysis of Doppler and photometric TESS and ground-based transit observations available for TOI-1408, known to host a system with two planets orbiting near 2:1 mean-motion […]
Exoplanets, -moons, -comets
Posted inExoplanets, -moons, -comets
Hybrid Worlds Are The Commonest Outcome Among The M-dwarf Sub-Neptunes Characterised With JWST
[astro-ph.EP] The sub-Neptunes orbiting M dwarfs are usually assigned to one of two classes: rocky cores beneath primordial hydrogen, or volatile-rich bodies formed beyond the water-ice line.
![Sky map of the Plato benchmark stars in Galactic coordinates. Different symbols indicate benchmark quality samples as defined in the text (Sect. 5.3). Symbol size increases with apparent brightness. -- [astro-ph.SR]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Plato-benchmark.png?resize=1200%2C719&ssl=1)
Posted inPLATO
Plato Benchmark Stars I. The Initial Benchmark Sample I
[astro-ph.SR] The ESA PLATO mission aims to detect and characterise Earth-size exoplanets orbiting bright, late-type stars using high-precision photometry and asteroseismology.
![Simulated climates and observables for CO2-rich planets near the outer edge of the habitable zone. The illustration on the right depicts a potentially habitable world orbiting a Sun-like star. The teal point in the lower left section of the panel marks the orbital location of such a planet within the OHZ, and the corresponding reflected light spectrum that could be observed via direct imaging is shown in teal in the middle, left section of the panel. The upper left section of the panel shows an illustration of the same planet in a globally frozen state located just beyond the habitable zone. Its orbital position (lower left) and reflected light spectrum (middle) are shown in white. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/High-CO2.png?resize=1200%2C721&ssl=1)
Posted inHabitable Zones
High-CO2 Climates And Observables In The Outer Habitable Zone
[astro-ph.EP] The habitable zone (HZ) is a fundamental concept used to guide our search for temperate exoplanets with stable surface liquid water that would sustain remotely detectable biosignatures.
Posted inExoplanets, -moons, -comets
Detecting Extragalactic Exoplanets With Fast Radio Burst Nanolensing
[astro-ph.EP] Fast Radio Bursts (FRBs) are spatially and temporally compact sources at cosmological distances. As background sources, they will be uniquely sensitive to the gravitational lensing of exoplanets outside of […]
![SpeX SXD spectrum of TOI-6981. The target spectrum (red) is shown alongside that of the M3.5V standard Luyten’s Star (grey), offset vertically for clarity. Regions of strong telluric absorption are shaded, and strong M-dwarf spectral features are indicated. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/TOI-6981.png?resize=1200%2C718&ssl=1)
Posted inExoplanets, -moons, -comets
TOI-6981 b: A Transiting Sub-Neptune At The Water Ice Line
[astro-ph.EP] We present TOI-6981 b, a cold (Teq= 170.0 +/-4.5 K, assuming an Earth-like albedo) sub-Neptune (Rb=2.40+/-0.10 R⊕) on a 60.8 day orbit around around its M4-type host star (R*=0.304 […]
![Final semi-major axes and masses for all objects produced in simulations with regular disks. The left panel shows objects produced in disks with low C/O ratios and the right one shows planets in high C/O ratio disks. The dash-dotted line shows the initial mass of planestesimals in our simulations while the dotted line shows the initial mass of planetary embryos. We consider planets to be anything at or above the initial embryo mass, fragments to be anything below the initial planetesimal mass, and planetesimals to be any object at or above the initial planetesimal mass but below the initial embryo mass. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Correlations.png?resize=1200%2C719&ssl=1)
Posted inExoplanets, -moons, -comets
Correlations Between The Carbon-to-Oxygen Ratio and the Orbital and Physical Properties of Exoplanets
[astro-ph.EP] Studies suggest that protoplanetary disks around stars with high carbon-to-oxygen (C/O) ratios can produce terrestrial planets with carbon-dominated compositions instead of silicon-dominated ones.
![Chemical clock relations for planet-hosting solar analogs, showing abundance ratios as a function of stellar age for [Y/Mg], [Y/Al], [Ba/Mg], [Ba/Al], [Sr/Mg], and [Y/(Mg+Al)/2]. Data points are color-coded by metallicity ([Fe/H]). Black lines show best-fit linear relations derived using Deming regression, accounting for uncertainties in both variables, and shaded regions indicate 1σ confidence intervals. All abundance ratios show statistically significant correlations with stellar age. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Planets-Around.png?resize=1200%2C720&ssl=1)
Posted inExoplanets, -moons, -comets
Planets Around Solar Twins/Analogs (PASTA) III: Chemical Clock Relations in Planet-Hosting Solar Analogs
[astro-ph.EP] Context. Abundance ratios between elements synthesized on different nucleosynthetic timescales provide empirical chemical clocks for estimating stellar ages, but robust calibrations require homogeneous samples with precise stellar parameters and […]
Posted inExoplanets, -moons, -comets
The IAC Presents The SELF Telescope In Italy, A Prototype To Advance The Search For Life On Exoplanets
[IAC] The Instituto de Astrofísica de Canarias (IAC) has presented the progress made on the SELF (Small ExoLife Finder) telescope at the international Charting the Future of Stellar and Exoplanet […]
Posted inExoplanets, -moons, -comets
Atmospheric Dynamics And Variability Of Periodically Irradiated Tidally Locked Planets
[astro-ph.EP] Time-variable stellar heating may create new climate states, such as permanently hot or cold hemispheres, on asynchronous planets. Planets on eccentric orbits, circumbinary planets and planets on polar orbits […]