The search for atmospheres on rocky exoplanets is a crucial step in understanding the processes driving atmosphere formation, retention, and loss.
We present confirmation of HD 143811 AB b, a substellar companion to spectroscopic binary HD 143811 AB through direct imaging with the Gemini Planet Imager (GPI) and Keck NIRC2.
3I/ATLAS, the third discovered interstellar object, has a heliocentric speed of 58 km/s and exhibits cometary activity.
Binding energy (BE) is a critical parameter in astrochemical modeling, governing the retention of species on interstellar dust grains and their subsequent chemical evolution.
![CN production versus heliocentric distance: Blue circles show VLT/X-shooter measurements of 3I/ATLAS (this work); the black solid and gray dashed curves are power–law fits to the 3I data only, giving Q(CN) ∝ r −9.38±1.2 h (weighted) and Q(CN) ∝ r −9.14±1.57 h (unweighted), respectively. Colored symbols compare with Solar–system comets compiled from the literature, grouped by dynamical class as in the legend; green squares mark measurements for 2I/Borisov. The left axis gives log10[Q(CN)/atoms s−1 ] and the bottom axis in log-scale the heliocentric distance rh (au). The right axis shows an approximate equilibrium surface temperature T(rh). Horizontal dashed lines indicate sublimation thresholds for CO, NH3, CO2, and H2O. Other comets references: Manfroid et al. (2021), Opitom et al. (2016), Opitom et al. (2017), Opitom et al. (2019), Fitzsimmons et al. (2019), Rauer et al. (2003) and S -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/08/VLT-Observations-Of-Interstellar.png?resize=1200%2C785&ssl=1)
We report VLT spectroscopy of the interstellar comet 3I/ATLAS (C/2025 N1) from rh≃4.4 to 2.85 au using X-shooter (300-550 nm, R≃3000) and UVES (optical, R≃35k−80k).
The search for large polycyclic aromatic hydrocarbons (PAHs) with over 100 carbon atoms is crucial to resolving the origin of unidentified infrared emission (UIE) bands.
We present new observations that densely sample the microwave (4-360 GHz) continuum spectra from eight young systems in the Taurus region.
Accurate surface rotation measurements are crucial to estimate stellar ages and improve our understanding of stellar rotational evolution.
The Decadal Survey on Astronomy and Astrophysics 2020 highlights the importance of advancing research focused on discovering and characterizing habitable worlds.
The orbital eccentricity-radius relation for small planets is indicative of the predominant dynamical sculpting processes during late-stage orbital evolution.
