Tricky Triplets: How Simulations Reveal New Paths for Massive Triple Stars
Sciarini et al. show that detailed stellar models like mesa predict very different outcomes for massive triple star systems compared to faster, simplified models like seba. These differences, especially in stellar size and mass loss, can dramatically alter whether stars interact, merge, or destabilize—affecting predictions for events like gravitational wave sources.
When Planets Go Their Own Way: A Stellar Ejection Explains a Misaligned Planetary System
The paper investigates the unusual misalignment in the IRAS04125 system, where a young planet and binary star orbit at a steep angle to the surrounding disc. The authors propose this was caused by the ejection of a third star from a chaotic triple system, which disturbed the disc and orbits. Simulations support this idea, offering a plausible explanation for the system’s geometry.
Starspot Activity and Rotation of SZ Piscium: A Doppler Imaging Study
This study examines the magnetic activity and rotation of SZ Piscium, a binary star system, using Doppler imaging to map starspots on the surface of its K-type subgiant star. The researchers observed widespread starspots, including a stable polar spot, and measured the star's differential rotation, finding that its equator rotates faster than its poles. They also confirmed the presence of a third companion star in the system, orbiting with a period of 1530 days.