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Very Large Telescope observations of interstellar comet 3I/ATLAS III: High-resolution monitoring of CN and forbidden oxygen emission across the perihelion passage with ESPRESSO
Baltasar Luco, Thomas H. Puzia, Rohan Rahatgaonkar +2
We characterize in 3I/ATLAS the heliocentric evolution of the CN production rate and the forbidden [OI] emission, describe the broader emission line inventory, and release the anal…
Pre-perihelion evolution of the NiI/FeI abundance ratio in the coma of the interstellar comet 3I/ATLAS. From extreme to normal
Damien Hutsemékers, Jean Manfroid, Emmanuël Jehin +9
Emission lines of FeI and NiI are commonly found in the coma of Solar System comets, even at large heliocentric distances. These atoms are most likely released from the surface of…
Spectral Characteristics of Interstellar Object 3I/ATLAS from SOAR Observations
Thomas H. Puzia, Rohan Rahatgaonkar, Juan Pablo Carvajal +2
Interstellar objects (ISOs) provide unique insights into the building blocks and conditions of extrasolar planetary systems. The newly discovered object, 3I/ATLAS (C/2025 N1), repr…
Hunting for Hydrated Minerals on Trans-Neptunian Objects
Tom Seccull, Wesley C. Fraser, Dominik A. Kiersz +1
We present new optical reflectance spectra of three potentially silicate-rich trans-Neptunian Objects (TNOs). These spectra were obtained with the aim of confirming past hints and…
Near-UV Reddening Observed in the Reflectance Spectrum of High Inclination Centaur 2012 DR30
Tom Seccull, Wesley C. Fraser, Thomas Puzia
Centaurs with high orbital inclinations and perihelia (i > 60 degrees; q >= 15 au) are a small group of poorly understood minor planets that are predicted to enter the giant planet…
The Reflectance of Cold Classical Trans-Neptunian Objects in the Nearest Infrared
Tom Seccull, Wesley C. Fraser, Thomas H. Puzia
Recent photometric surveys of Trans-Neptunian Objects (TNOs) have revealed that the cold classical TNOs have distinct z-band color characteristics, and occupy their own distinct su…