LHS 1140 b is the second-closest temperate transiting planet to the Earth with an equilibrium temperature low enough to support surface liquid water.
The search for habitable conditions and signs of life on exoplanets is a major frontier in modern astronomy. Detecting atmospheric signatures of Earth-like exoplanets is challenging due to their small […]
![Fiducial model generated (synthetic) reflected light spectrum of an Earth-like planet at quadrature (i.e., at a planetary phase angle α = 90°; see Table 1 for fiducial input values). The colored areas indicate the spectral impact of the gas species by showing the difference between the baseline spectrum (black line) and the spectrum obtained if they were absent from the atmosphere. The top of the figure shows the two wavelength ranges considered and their spectral resolving power: red bandpass (λ = [0.87, 1.05] µm, res = 140; see Appendix B) and visible (λ = [0.45, 1] µm, res = 140) + NIR (λ = [1, 1.80] µm, res = 70). The error bars show the nonrandomized, wavelength-independent noise corresponding to specific signal-to-noise ratios (SNR) at the reference wavelengths λ = 0.45 µm for the vNIR range, and λ = 0.88 µm for the red bandpass. --astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/06/Influence-of-Orbit-and-Mass.png?resize=1200%2C720&ssl=1)
Survey strategies for upcoming exoplanet direct imaging missions have considered varying assumptions of prior knowledge. Precursor radial velocity surveys could have detected nearby exo-Earths and provided prior orbit and mass […]
The European Southern Observatory (ESO) has signed an agreement with an international consortium of institutions to develop and build ANDES, the ArmazoNes High Dispersion Echelle Spectrograph. The ANDES instrument will […]
We update the PlanetS catalog of transiting planets with precise and robust mass and radius measurements and use this comprehensive catalog to explore Mass-Radius (M-R) diagrams.
![The [Fe/H] versus C/O distribution for this work sample, as well as other M dwarfs studied by Souto et al. (2017), Souto et al. (2018), Souto et al. (2020). The orange circles represent the results for the four JWST targets studied here; Results for M dwarfs from our previous studies (all based on the same methodology as here) are also shown: orange triangles are M dwarfs with exoplanets detected, while the gray squares are M dwarfs without exoplanets detected so far. We also present results for FGK dwarfs from Nissen (2013) (green triangles; all with detected exoplanets), Teske et al. (2014) with (light blue diamonds) detected exoplanets, and Delgado Mena et al. (2021) with (pink circles), and without detected exoplanets (yellow cross). Additionally, four curves represent the linear regressions of the [Fe/H] vs. C/O distribution for M dwarfs with planet detected (solid orange line), M dwarfs without planet detected (solid gray line), FGK dwarfs with detected planets (dashed orange line), and FGK dwarfs without detected planets (dashed gray line). -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/06/Stellar-Characterization-and.png?resize=1200%2C719&ssl=1)
Exoplanets hosting M dwarfs are the best targets to characterize Earth-like or super-Earth planetary atmospheres with the James Webb Space Telescope (JWST). We determine detailed stellar parameters (Teff, logg, and […]
The habitability of exoplanets hosted by M-dwarf stars dramatically depends on their space weather. We present 3D magneto-hydrodynamic simulations to characterise the magneto-plasma environment and thus the habitability of the […]
Many novel methods have been proposed to mitigate stellar activity for exoplanet detection as the presence of stellar activity in radial velocity (RV) measurements is the current major limitation.
Astronomers have made the rare and tantalising discovery of an Earth-like exoplanet 40 light-years away that may be just a little warmer than our own world.
A technology demo on the Nancy Grace Roman Space Telescope will help increase the variety of distant planets scientists can directly image.
