X-SHOOTER Spectrum of Comet 3I/ATLAS: Insights into a Distant Interstellar Visitor
arXiv:2507.07312 · doi:10.1051/0004-6361/202556338
Abstract
Comets are primitive remnants of the early Solar System whose composition offers fundamental clues to their formation and evolution. High-resolution, broad-wavelength spectroscopy is crucial for identifying volatile species and constraining the physical conditions within the coma. We aim to characterize the gas composition and physical environment of the newly discovered comet C/2025 N1 through optical and near-infrared spectroscopy. We used a medium-resolution spectrum of comet C/2025 N1 with X-shooter at the ESO Very Large Telescope (VLT), covering the 300-2500 nm wavelength range. Standard data reduction and flux calibration were applied. Although the object clearly shows activity, only upper limits to the production rates of OH and CN can be estimated: s and s, respectively. We obtained red spectral slopes consistent with those of typical D-type asteroids and outer Solar System objects.
4 pages, two figures, submitted as a Letter to the Editor in A&A
References in corpus (9)
- Interstellar Interloper 1I/2017 U1: Observations from the NOT and WIYN Telescopes
- Initial characterization of interstellar comet 2I/Borisov
- Initial Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)
- 2I/Borisov: A C depleted interstellar comet
- 1I/2017 U1 (`Oumuamua) is Hot: Imaging, Spectroscopy and Search of Meteor Activity
- Detection of CN gas in Interstellar Object 2I/Borisov
- Detection of a Water Tracer in Interstellar Comet 2I/Borisov
- Interstellar comet 3I/ATLAS: discovery and physical description
- Assessing interstellar comet 3I/ATLAS with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope