An upper limit on late accretion and water delivery in the TRAPPIST-1 exoplanet system

20. 03 2023

Stars

Astronomers have discovered a brown dwarf orbiting the red giant HD 18438

Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.

15. 03 2023

Exoplanets

Planetary Population Synthesis and the Emergence of Four Classes of Planetary System Architectures

10. 03 2023

Exoplanets

Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions

09. 03 2023

Exoplanets

Newly discovered exoplanet HD 207496 b is too close to its star and is loosing atmosphere