2 Lupi

2 Lupi is a star system located approximately 48.7 light-years away in the constellation Lupus (the Wolf). It is a complex system consisting of a K-type main-sequence star (2 Lupi A) and two red dwarf stars (2 Lupi B and 2 Lupi C).

2 Lupi A is the primary star in the system and is slightly smaller and cooler than our Sun. It has been found to host three confirmed exoplanets: b, c, and d. These planets were discovered using the transit method, where the planets pass in front of their host star, causing a slight dip in its brightness.

2 Lupi b is a hot sub-Neptune-sized planet with a short orbital period. 2 Lupi c is also a sub-Neptune, but with a longer orbital period than b. 2 Lupi d is the outermost of the three transiting planets and is also a sub-Neptune-sized world. Notably, this system is one of the few known where multiple transiting planets have been observed, allowing for detailed comparative studies of exoplanet atmospheres and compositions. The multi-planetary system provides valuable insights into planet formation and orbital dynamics.

The red dwarf companion stars, 2 Lupi B and 2 Lupi C, are located at greater distances from 2 Lupi A and are significantly fainter. Their influence on the planetary system is still being studied. The complete architecture of the 2 Lupi system, including the interactions between the stars and planets, makes it a key target for ongoing astronomical research.