“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 […]
Sun-like star
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
HD 35843: A Sun-like Star Hosting A Long Period Sub-Neptune And Inner Super-Earth
We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star, HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Habitable Zones, Space Weather & Heliophysics, Status Report, Stellar Cartography
Comparing The Sun To Sun-like Stars. On The Importance Of Addressing Faculae/spot Domination
Whether the Sun is an ordinary G-type star is still an open scientific question.
Posted inAstronomy & Telescopes, Brown Dwarfs, Exoplanets, -moons, -comets, Exploration Gear & Tech, Gas Giants, Status Report, Stellar Cartography
The TESS-Keck Survey XXIV: Outer Giants May be More Prevalent in the Presence of Inner Small Planets
We present the results of the Distant Giants Survey, a three-year radial velocity (RV) campaign to search for wide-separation giant planets orbiting Sun-like stars known to host an inner transiting […]
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Status Report, Water/Hycean Worlds & Oceanography
The Fate of Oceans on First-Generation Planets Orbiting White Dwarfs
Several groups have recently suggested that small planets orbiting very closely around white dwarf stars could be promising locations for life to arise, even after stellar death. There are still […]
Posted inExoplanets, -moons, -comets, Press Release
Ultra-dense Super-Earth With An Outer Companion Offers Clues About Its Formation
An international team led by researchers in Japan and Europe has discovered a new multi-planet system around a Sun-like star, including an ultra-short period planet with one of the highest […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Stellar Cartography: Small And Close-In Planets Are Uncommon Around A-type Stars
The Kepler and K2 missions enabled robust calculations of planet occurrence rates around FGKM-type stars. However, these missions observed too few stars with earlier spectral types to tightly constrain the […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
A Fourth Planet In The Kepler-51 System Revealed By Transit Timing Variations
Kepler-51 is a ≲1 Gyr-old Sun-like star hosting three transiting planets with radii ≈6-9R⊕ and orbital periods ≈45-130 days. Transit timing variations (TTVs) measured with past Kepler and Hubble Space […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Press Release, Radiation, Space Weather & Heliophysics, Stellar Cartography
Sun-like Stars Have Been Found Orbiting Hidden Companions
Most stars in our universe come in pairs. While our own Sun is a loner, many stars like our Sun orbit similar stars, while a host of other exotic pairings […]
![The [Mg/Si]-[C/O] diagram for the M dwarf sample (overlying orange dots) and GK dwarf sample (underlying colourful dots in density). An ODR fit is applied to the M dwarf sample, with the best fit shown in the solid line and 1σ and 2σ error intervals shown in dash and dot lines (in brown), respectively. The regression parameters are also shown on the plot. A Student’s t-test is also applied to test the significance of the slope different from zero, and the resultant p-value is less than 0.001. -- astro-ph.SR](https://i0.wp.com/astrobiology.com/wp-content/uploads/2024/07/Towards-Characterising-Rocky-Worlds.png?resize=1200%2C720&ssl=1)
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Status Report, Water/Hycean Worlds & Oceanography
Towards Characterising Rocky Worlds: Trends In Chemical Make-ups Of M dwarfs Versus GK dwarfs
Elemental abundances of Sun-like stars are crucial for understanding the detailed properties of their planets. However, measuring elemental abundances in M stars is challenging due to their faintness and pervasive […]