Space-based missions such as TESS are identifying a wealth of short-period (≲30 d) transiting planets. Despite the growing number of confirmed and candidate planets, the sample is still incomplete and […]
Stellar Cartography
Posted inExoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Insights Into The Exoplanet Radius Valley From Host-Star Ages, Activity, Chemistry, And Birth Radius
The radius valley, a bimodal feature in the size distribution of close-in small exoplanets, is widely interpreted as a signature of atmospheric loss and therefore provides a key constraint on […]
Posted inAstrogeology, Atmospheres, Climate, Weather, Brown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Ice Giant, Icy Worlds, Press Release, Stellar Cartography, Water/Hycean Worlds & Oceanography
A New Spin On Planet Formation
Astronomers using the W. M. Keck Observatory on Maunakea, Hawaiʻi Island, have confirmed a long-predicted relationship between planetary mass and rotation.
Posted inAstrogeology, Exoplanets, -moons, -comets, Space Weather & Heliophysics, Status Report, Stellar Cartography
Wind Accretion Onto Planets Orbiting An Evolving Solar-like Star And Their Detectability
As stars evolve, they undergo significant changes in their physical properties, which can have a profound impact on the planets orbiting them.
Posted inExoplanets, -moons, -comets, Habitable Zones, Science Fiction, Status Report, Stellar Cartography
The Impact Of Supermassive Black Holes On Exoplanet Habitability: I. Spanning The Natural Mass Range
While the influence of supermassive black hole (SMBH) activity on habitability has garnered attention, the specific effects of active galactic nuclei (AGN) winds, particularly ultrafast outflows (UFOs), on planetary atmospheres […]
Posted inAstronomy & Telescopes, Gaia Mission, Press Release, Stellar Cartography
Our Sun Escaped Together With Stellar Twins From Galaxy Center
Researchers have uncovered evidence for our Sun joining a mass migration of similar “twins” leaving the core regions of our galaxy, 4 to 6 billion years ago. The team created […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Status Report, Stellar Cartography
Solar Twins In Gaia DR3 GSP-Spec II. Age Distribution And Its Implications For The Sun’s Migration
Solar twins are among the most powerful tracers of Galactic disk evolution owing to their unique property of sharing nearly solar metallicities ([Fe/H] ~ 0) while spanning a wide range […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Long-period Magnetic Activity In The K Dwarf GJ 1137 And A New Super-Earth On A 9-day Orbit
Aims: We investigate long-term radial velocity (RV) variability in the K-dwarf star GJ 1137 (HD 93083, HIP52521), a known Saturn-mass exoplanet host, and assess the role of stellar activity in […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Space Weather & Heliophysics, Status Report, Stellar Cartography
Long-term Activity Cycles In Planetary M Stars Observed With SOPHIE
M dwarfs are prime targets for exoplanet searches due to their low masses and radii, which enable the detection of small planets in their habitable zones (HZs).
Posted inBrown Dwarfs, Exoplanets, -moons, -comets, Gas Giants, Status Report, Stellar Cartography
A Universal Brown Dwarf Desert Formed Between Planets And Star
Giant planets and brown dwarfs play a crucial role in star and planet formation, as they are situated at the boundary between planets and stars with uncertain formation mechanisms.