Context. Earth-like planets orbiting in the habitable zone of K- to G-type stars create an RV effect in amplitude of less than 1 m s−1 and have orbital periods of […]
Sun-like star
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
Precise Physical Parameters, Habitability, and Orbital Stability of Sun-like SB2 Systems: HD 130669, HD 184467, HD 191854, and HD 214222
This work analyzes four Sun-like double-lined spectroscopic binary (SB2) systems by combining visual and spectroscopic observational data with Al-Wardat’s atmospheric modeling method to accurately determine their fundamental parameters.
Posted inExoplanets, -moons, -comets, Habitable Zones, Status Report, Venus
Exoplanets Synchronization: Learning From Venus’ Retrograde Rotation
Context: Planets in the HZ can have dense atmospheres affecting their rotations. Over time, the rotation tends to stationary solutions that can be synchronous or asynchronous.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
Are We There Yet? Challenges In Quantifying The Frequency Of Earth Analogs In The Habitable Zone
Searching for life elsewhere in the universe is one of the most highly prioritized pursuits in astronomy today.
Posted inHabitable Zones, Origin & Evolution of Life, Press Release, Radiation, Space Weather & Heliophysics
Coronal Mass Ejections At The Dawn Of The Solar System
Down here on Earth we don’t usually notice, but the Sun is frequently ejecting huge masses of plasma into space. These are called coronal mass ejections (CMEs).
![[LEFT] A.1: WISPIT 1b, 1c, and background sources highlighted in the H-band median-combined image of epoch 2022-11-19. [RIGHT] WISPIT 1b, 1c, and background sources highlighted in the Ks-band median-combined image of epoch 2024-11-30. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/08/WIde-Separation-Planets-In-Time.png?resize=1200%2C721&ssl=1)
Posted inExoplanets, -moons, -comets, Status Report
WIde Separation Planets In Time (WISPIT): Two Directly Imaged Exoplanets Around The Sun-like Stellar Binary WISPIT 1
Wide separation gas giant planets present a challenge to current planet formation theories, and the detection and characterisation of these systems enables us to constrain their formation pathways.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Discovery Of A Multi-planetary System Orbiting The Aged Sun-like Star HD 224018
In 2016, Kepler/K2 detected a system of two sub-Neptunes transiting the star HD 224018, one of them showing a mono-transit event.
Posted inAstrochemistry, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report
Earth-mass Planets With He Atmospheres In The Habitable Zone Of Sun-like Stars
The discovery of many low-mass exoplanets, including several planets within the habitable zone of their host stars, has led to the question of which kind of atmosphere surrounds them.
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Impacts of Atmospheric Carbon Species and Stellar Type on Climates of Terrestrial Planets
The climates of terrestrial planets are largely determined by the composition of their atmospheres and spectral types of their host stars. Previous studies suggest a wide range of carbon species […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Press Release
Super-Earth Discovered In The Habitable Zone Of A Sun-Like Star Via TTV Technique
“Are we alone?” This ancient question has occupied humanity’s mind for a long time. In 1995, the discovery of the first exoplanet orbiting a Sun-like star opened the door to […]