![[L] This plot shows the results for the clone_001-020, which assumes the same initial state of a gas giant and randomly generates planetesimals and embryos based on their distribution, as discussed in Section 2.2. We find that slight differences in the initial state of planetesimals and embryos significantly impact on the resulting planetary systems (indicated by blue dots). However, this influence can be reduced by considering the mean orbit of the planets (represented by gray dots). [R] In this plot, we show results in the absence of a giant planet, with the initial states of planetesimals and planetary embryos randomly generated based on their distribution. The findings depicted in the figure are consistent with the points made in Fig. 4, namely that the total mass and mean position of the formed planets is relatively constant despite the variation in the detailed planetary architectures. Moreover, this plot further underscores that including an outer gas giant leads to a more tightly confined orbit for terrestrial planets formed within its inner boundary, compared with Fig 3. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/05/How-The-Presence-Of-A-Giant.png?resize=1200%2C900&ssl=1)
The architecture and masses of planetary systems in the habitable zone could be strongly influenced by outer giant planets, if present.
terrestrial exoplanet
Posted inAstrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Mapping, Geodesy, Cartography, Bathymetry, Status Report, Water/Hycean Worlds & Oceanography
Potential Surface Ice Distribution On Close-in Terrestrial Exoplanets Around M dwarfs
Previous studies suggested that surface ice could be distributed on close-in terrestrial exoplanets around M-dwarfs if heat redistribution on the planets is very inefficient.
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biophysics, Habitable Zones, Status Report, Water/Hycean Worlds & Oceanography
Impact of Planetary Parameters on Water Clouds Microphysics
Potentially habitable exoplanets are targets of great interest for the James Webb Space Telescope and upcoming mission concepts such as the Habitable Worlds Observatory. Clouds strongly affect climate and habitability, […]
Posted inAstronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Status Report
Searching For Free-Floating Planets with TESS: I. Discovery of a First Terrestrial-Mass Candidate
Though free-floating planets (FFPs) that have been ejected from their natal star systems may outpopulate their bound counterparts in the terrestrial-mass range, they remain one of the least explored exoplanet […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, TRAPPIST-1
Biosignatures From Pre-oxygen Photosynthesising Life On TRAPPIST-1e
In order to assess observational evidence for potential atmospheric biosignatures on exoplanets, it will be essential to test whether spectral fingerprints from multiple gases can be explained by abiotic or […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
TESS Hunt For Young And Maturing Exoplanets (THYME) XI: An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400Myr Ursa Major Moving Group
Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution. We present the discovery of HD 63433d – a nearby (22pc), Earth-sized planet transiting […]
Posted inAstronomy & Telescopes, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Habitable Zones, Press Release, Venus
Hunting For Venus 2.0
With the first paper compiling all known information about planets like Venus beyond our solar system, scientists are the closest they’ve ever been to finding an analog of Earth’s “twin.”
Posted inBiosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
Polarized Signatures of a Habitable World: Comparing Models of an Exoplanet Earth with Visible and Near-infrared Earthshine Spectra
In the JWST, Extremely Large Telescopes, and LUVOIR era, we expect to characterize a number of potentially habitable Earth-like exoplanets.