74 citations · 320 across the 9 of their papers we have counts for
9 papers
Biofluorescent Worlds I: Global Biological Fluorescence as a Biosignature
J. T. O'Malley-James, L. Kaltenegger
In this paper, we analyze a new possible biological surface feature for habitable worlds orbiting other stars: biofluorescence. High ultraviolet (UV) and blue radiation fluxes driv…
Expanding the Timeline for Earth's Photosynthetic Red Edge Biosignature
Jack T. O'Malley-James, Lisa Kaltenegger
When Carl Sagan observed the Earth during a Gallileo fly-by in 1993, he found a widely distributed surface pigment with a sharp reflection edge in the red part of the spectrum, whi…
Lessons from early Earth: UV surface radiation should not limit the habitability of active M star systems
Jack T. O'Malley-James, Lisa Kaltenegger
The closest potentially habitable worlds outside our Solar system orbit a different kind of star than our Sun: smaller red dwarf stars. Such stars can flare frequently, bombarding…
The Vegetation Red Edge Biosignature Through Time on Earth and Exoplanets
Jack T. O'Malley-James, Lisa Kaltenegger
The high reflection of land vegetation in the near-infrared, the vegetation red edge (VRE), is often cited as a spectral biosignature for surface vegetation on exoplanets. The VRE…
Biofluorescent Worlds II. Biological fluorescence induced by stellar UV flares, a new temporal biosignature
Jack T. O'Malley-James, Lisa Kaltenegger
Our first targets in the search for signs of life are orbiting nearby M stars, such as the planets in the Proxima Centauri, Ross-128, LHS-1140, and TRAPPIST-1 systems. Future groun…
In Search of Future Earths: Assessing the possibility of finding Earth analogues in the later stages of their habitable lifetimes
J. T. O'Malley-James, J. S. Greaves, J. A. Raven +1
Earth will become uninhabitable within 2-3 Gyr as a result of the moving boundaries of the habitable zone caused by the increasing luminosity of the Sun. Predictions about the futu…
Swansong Biospheres II: The final signs of life on terrestrial planets near the end of their habitable lifetimes
Jack T. O'Malley-James, Charles S. Cockell, Jane S. Greaves +1
The biosignatures of life on Earth do not remain static, but change considerably over the planet's habitable lifetime. Earth's future biosphere, much like that of the early Earth,…
Swansong Biospheres: Refuges for life and novel microbial biospheres on terrestrial planets near the end of their habitable lifetimes
J. T. O'Malley-James, J. S. Greaves, J. A. Raven +1
The future biosphere on Earth (as with its past) will be made up predominantly of unicellular microorganisms. Unicellular life was probably present for at least 2.5 Gyr before mult…
Light and Life: Exotic Photosynthesis in Binary Star Systems
J. T. O'Malley-James, J. A. Raven, C. S. Cockell +1
The potential for hosting photosynthetic life on Earth-like planets within binary/multiple stellar systems was evaluated by modelling the levels of photosynthetically active radiat…