Dim interstellar asteroids typically reach detectable brightness only when moving fast across the sky, while bright or cometary objects are detectable at slower speeds, implying surveys may miss a large fraction of the dim population.
Spectroscopy and thermal modelling of the first interstellar object 1I/2017 U1 'Oumuamua
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abstract
During the formation and evolution of the Solar System, significant numbers of cometary and asteroidal bodies were ejected into interstellar space$^{1,2}$. It can be reasonably expected that the same happened for planetary systems other than our own. Detection of such Inter- stellar Objects (ISOs) would allow us to probe the planetesimal formation processes around other stars, possibly together with the effects of long-term exposure to the interstellar medium. 1I/2017 U1 'Oumuamua is the first known ISO, discovered by the Pan-STARRS1 telescope in October 2017$^3$.The discovery epoch photometry implies a highly elongated body with radii of $\sim 200 \times 20$ m when a comet-like geometric albedo of 0.04 is assumed. Here we report spectroscopic characterisation of 'Oumuamua, finding it to be variable with time but similar to organically rich surfaces found in the outer Solar System. The observable ISO population is expected to be dominated by comet-like bodies in agreement with our spectra, yet the reported inactivity implies a lack of surface ice. We show this is consistent with predictions of an insulating mantle produced by long-term cosmic ray exposure. An internal icy composition cannot therefore be ruled out by the lack of activity, even though 'Oumuamua passed within 0.25 au of the Sun.
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A minimal extension of the Standard Model with three heavy Majorana neutrinos simultaneously realizes fermionic dark matter, a strong first-order electroweak phase transition, and low-scale resonant leptogenesis consistent with neutrino data.
3I/ATLAS lost roughly 1–7 meters of its surface and ~10^9–10^10 kg of mass during its Solar System passage, based on fits to observed gas production rates.
A review finds all available observations of 'Oumuamua consistent with natural processes from Solar System minor bodies and planetary evolution.
citing papers explorer
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Sky-Plane Velocity Distributions of Interstellar Objects and Implications for Their Detection
Dim interstellar asteroids typically reach detectable brightness only when moving fast across the sky, while bright or cometary objects are detectable at slower speeds, implying surveys may miss a large fraction of the dim population.
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Solving Cosmological Puzzles using Finite Temperature $\nu$SMEFT
A minimal extension of the Standard Model with three heavy Majorana neutrinos simultaneously realizes fermionic dark matter, a strong first-order electroweak phase transition, and low-scale resonant leptogenesis consistent with neutrino data.
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Assessment of the Mass Loss and Radius Change of 3I/ATLAS Based on Observed Production Rates
3I/ATLAS lost roughly 1–7 meters of its surface and ~10^9–10^10 kg of mass during its Solar System passage, based on fits to observed gas production rates.
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The Natural History of 'Oumuamua
A review finds all available observations of 'Oumuamua consistent with natural processes from Solar System minor bodies and planetary evolution.