Gaia Data Release 3 Archives - Astrobiology

Gaia BP minus RP color vs. absolute magnitude diagram of Gaia DR3 Catalog of Nearby Sources. The 7414 final candidates reported by ExoDNN after filtering are displayed in green. Prediction for a few reference objects, Proxima Centauri, LHS1610, BD+05 5128, HD164604, Gaia-3b, Gaia-4b and Gaia-5b, etc., is also shown. Sources with known companions detected by ExoDNN are marked by the green boxes, while red-crosses refer to reference objects for which model predicted probability ˆp < p0, that is, undetected. ExoDNN closest new candidates are highlighted to the left of the main sequence with blue circles. -- astro-ph.EP

AI - Data - Apps - Cybernetics, Astronomy & Telescopes, Exoplanets, -moons, -comets, Status Report, Stellar Cartography

ExoDNN: Boosting Exoplanet Detection With Artificial Intelligence. Application to Gaia Data Release 3

by Keith CowingFebruary 5, 2026February 5, 2026

We combine Gaia Data Release 3 and artificial intelligence to enhance the current statistics of substellar companions, particularly within regions of the orbital period vs. mass parameter space that remain […]

Average sensitivity of HGCA astrometric acceleration method to companions across mass and separation space, calculated from non-significant accelerations. 90%, 50%, and 10% contours are shown. All known companions of HWO targets in the HGCA are plotted. Red circles and stars represent planets and stars, respectively, that account for their host star’s acceleration; white circles and stars represent planets and stars that do not account for the acceleration. -- astro-ph.SR

Astrogeology, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gaia Mission, Habitable Zones, Imaging & Spectroscopy, Press Release, Water/Hycean Worlds & Oceanography

Astrometric Accelerations of Provisional Targets for the Habitable Worlds Observatory

by Keith CowingJuly 1, 2025July 1, 2025

NASA’s Habitable Worlds Observatory (HWO) will be the first space telescope capable of directly imaging Earth-like planets in the habitable zones of Sun-like stars to probe their atmospheres for signs […]

The LSST throughput curves across the ugrizybands (colored lines) represent the combined effects of the Rubin Observatory system4, including mirrors, lenses, filters, detectors, and a fiducial atmosphere at 1.2 airmasses (black dash-dotted line). Overlaid is a scaled spectrum of a 2R⊕ exoplanet atmosphere (solid blue line), orbiting a 1R⊙ star, modeled using ExoTransmit(Kempton et al., 2017). The Vegetation Red Edge (thick maroon line), from RapidEye Multi-Spectral Imager data 5, shows the reflectance increase near 700 nm. If an Earth-like exoplanet orbiting a Sun-like star harbored vegetation with similar photosynthetic properties, a comparable red edge feature could manifest in the exoplanet’s phase curve, detectable as brightness variations in LSST’s iband. LSST’s repeated observations over 10 years could enable statistical reconstruction of such phase curves. Vertical dotted lines mark biosignature wavelengths. -- Frontiers

Astrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Multiscale Astrobiology With The Vera C. Rubin Observatory Legacy Survey Of Space and Time

by Keith CowingMay 24, 2025May 24, 2025

The Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST) presents an unprecedented opportunity to advance the search for astrobiologically relevant data across diverse astronomical environments.

Artist impression of exoplanet Gaia-4b -- ESA

Astronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Gaia Mission, Imaging & Spectroscopy, Press Release, Stellar Cartography

Wobbling Stars Reveal Hidden Companions In Gaia Data

by Keith CowingFebruary 4, 2025

New research, published today, uses data collected by ESA’s Gaia spacecraft to confirm the existence of two mysterious celestial objects. Gaia-4b is a ‘Super-Jupiter’ exoplanet, and Gaia-5b a brown dwarf. […]