Results 81 to 90 of about 1,293 (185)
Strength Ratios of Diffuse Interstellar Bands in Slightly Reddened Objects
UniverseThe disk of the Milky Way fills the interstellar medium in the form of discrete clouds, many (∼30) light-years across. The average density of this medium is 1 hydrogen atom per cm3 (Oort limit), in the clouds—several dozen atoms, and between the clouds ...
Jacek Krełowski, Arkadii Bondar
doaj +1 more source
Precovery Observations of 3I/ATLAS from TESS Suggest Possible Distant Activity
The Astrophysical Journal Letters3I/ATLAS is the third macroscopic interstellar object detected traversing the solar system. Since its initial discovery on UT 2025 July 1, hundreds of hours on a range of observational facilities have been dedicated to measuring the physical properties ...
Adina D. Feinstein +2 more
doaj +1 more source
The Implications of ‘Oumuamua on Panspermia
The Astrophysical JournalPanspermia is the hypothesis that life originated on Earth from the bombardment of foreign interstellar ejecta harboring polyextremophile microorganisms. Since the 2017 discovery of the interstellar body ‘Oumuamua (1I/2017 U1) by the Pan-STARRS telescope,
David Cao +2 more
doaj +1 more source
Capture of Interstellar Objects and Binaries
Interstellar objects (ISOs) can become gravitationally bound to the solar system, enabling multiple observations. If these bound ISOs exist, they provide valuable opportunities to generalize models of planetesimal formation, composition, and ejection beyond our solar system.
Marquardt-Demen, Rainer +2 more
openaire +2 more sources
Prospects for Backtracing 1I/‘Oumuamua and Future Interstellar Objects [PDF]
The Astrophysical Journal Letters, 2018 Abstract 1I/‘Oumuamua is the first of likely many small bodies of extrasolar origin to be found in the solar system. These interstellar objects (ISOs) are hypothesized to have formed in extrasolar planetary systems prior to being ejected into interstellar space and subsequently arriving at the solar system. This paper discusses necessary
openaire +3 more sources
Prediscovery TESS Observations of Interstellar Object 3I/ATLAS
The Astrophysical Journal LettersAbstract 3I/ATLAS, also known as C/2025 N1 (ATLAS), is the third known macroscopic interstellar object to pass through our solar system. We report serendipitous Transiting Exoplanet Survey Satellite (TESS) observations of 3I/ATLAS taken between 2025 May 7 and 2025 June 2, 55 days prior to the discovery date (2025 ...
Jorge Martinez-Palomera +5 more
openaire +2 more sources
Interstellar Comet 3I/ATLAS: Evidence for Galactic Cosmic-Ray Processing
The Astrophysical Journal LettersSpectral observations of 3I/ATLAS (C/2025 N1) with JWST/NIRSpec and SPHEREx reveal an extreme CO _2 enrichment (CO _2 /H _2 O = 7.6 ± 0.3) that is 4.5 σ above solar system comet trends and among the highest ever recorded.
Romain Maggiolo +4 more
doaj +1 more source
Bibechana, 2021 Interstellar dust properties using far-infrared bands analyze nature around asymptotic giant branch stars and stellar objects. Here, we present physical properties around the cavity region across an AGB star named IRAS 04427+4951 Sky View Observatory of ...
Devendra Raj Upadhyay, Trishna Subedi
doaj
A 6 cm Formaldehyde Line Survey toward WISE Point Sources
The Astrophysical Journal Supplement SeriesWe conducted a 6 cm formaldehyde (H _2 CO) line survey across the northern sky, targeting 3149 high-mass star-forming region candidates selected from the all-sky Wide-field Infrared Survey Explorer (WISE) point-source catalog using the Shanghai TianMa 65
Jun-Ting Liu +8 more
doaj +1 more source
Spectral Characteristics of Interstellar Object 3I/ATLAS from SOAR Observations
The Astrophysical Journal LettersInterstellar objects (ISOs) provide unique insights into the building blocks and conditions of extrasolar planetary systems. The newly discovered object, 3I/ATLAS (C/2025 N1), represents the third known ISO after 1I/’Oumuamua and 2I/Borisov.
Thomas H. Puzia +4 more
doaj +1 more source