Nautilus Array Proposed to Track Missing Exoplanet Atmospheres
Summary
A US/UK research team has posted an arXiv white paper proposing the Nautilus Space Observatory (Nautilus Deep Space Observatory, NDSO), a constellation of 35 lens-based (not mirror-based) space telescopes led by the University of Arizona and first proposed in the late 2010s. The white paper focuses Nautilus’s science case on exoplanet atmosphere formation and evolution — specifically the timescales over which planets evolve into sub-Neptunes and super-Earths (the two most common exoplanet types, found around 30-50% of sun-like stars), atmospheric mass loss, carbon-oxygen ratio evolution, and the emergence of helium-dominated atmospheres, across timescales from protoplanetary-disk youth (0-10 Myr) to full maturity (4.6 Gyr). Each of the 35 units carries an 8.5 m lens, instrument package, solar panel, and Mylar balloon; combined light-collecting power is claimed to exceed JWST by more than double, Hubble by more than 10×, and ESA’s proposed Ariel telescope by nearly 100×. The paper frames Nautilus as directly supporting NASA’s Cosmic Origins and Exoplanet Exploration Programs. As with most white papers, next steps require scaling current small prototypes toward the full 8.5 m lens design.
Key Claims
- Nautilus/NDSO would consist of 35 space telescopes, each with an 8.5 m (28 ft) lens (14 m/46 ft including full assembly), using refractive lens optics rather than mirrors.
- Combined light-collecting power exceeds JWST by >2×, Hubble by >10×, and ESA’s proposed Ariel telescope by ~100×.
- Scientific objectives include timescales for sub-Neptune/super-Earth atmospheric evolution, atmospheric mass-loss rates, carbon-oxygen ratio evolution, and onset of helium-dominated atmospheres, across 0-10 Myr (protoplanetary disk) to 4.6 Gyr (mature planet) timescales.
- Super-Earths and sub-Neptunes are estimated to orbit 30-50% of sun-like stars.
- As of the article, NASA has confirmed just under 6,300 exoplanets, of which ~2,200 are sub-Neptune-like and ~1,800 are super-Earths.
- Nautilus is explicitly positioned as supporting both NASA’s Cosmic Origins Program and its Exoplanet Exploration Program.
- Current Nautilus prototypes are much smaller than the proposed 8.5 m operational lens; the concept remains at the white-paper/proposal stage.
Notable Quotes
“Answering these questions requires the high spatial resolution, broad-wavelength coverage, large effective area, and parallelized multiple units that Nautilus provides. By isolating the physical processes that govern the evolution of planets and their atmospheres, these science objectives directly support NASA’s Cosmic Origins and Exoplanet Exploration Programs.” — Nautilus white paper