Cosmic Optics

Located approximately 22 light-years from the Solar System in the constellation Eridanus , LTT 1445 Ab represents a benchmark in the study of terrestrial exoplanets . Discovered by the Transiting Exoplanet Survey Satellite (TESS) in 2019, this world is a confirmed rocky Super-Earth orbiting a red dwarf star . Its significance lies not only in its proximity to our own system but in its unique position within a triple-star system . While many exoplanets reside in solitary stellar environments, LTT 1445 Ab is subject to the complex gravitational and radiative influences of three distinct stellar bodies, though it directly orbits the primary star, LTT 1445 A. As a transiting planet, LTT 1445 Ab passes directly between its host star and the observer, allowing for precise measurements of its radius. When combined with radial velocity data , which measures the gravitational tug the planet exerts on its star, astronomers have determined its mass. These two variables—mass and radius—...

Deep within the constellation of Aquarius, approximately 40 light-years from Earth, lies one of the most intensively studied planetary systems in modern astrophysics: the TRAPPIST-1 system . At the heart of this compact stellar family is an ultra-cool red dwarf star , orbited by seven rocky, Earth-sized worlds. Among these, TRAPPIST-1c stands out as a critical laboratory for understanding the limits of planetary atmosphere retention, crustal geology, and the intense physical forces that shape terrestrial worlds orbiting low-mass stars. Discovered via the transit method , this exoplanet offers researchers an unprecedented look at a dry, highly irradiated rocky surface stripped of its primary volatile envelope. TRAPPIST-1c orbits its host star at a distance of just 0.0158 astronomical units (AU), completing a full revolution in a mere 2.42 Earth days. Because of its extreme proximity to the stellar primary, the planet is subjected to immense gravitational forces and high-energ...

Discovered in January 2011 by NASA’s Kepler Space Telescope , Kepler-10b holds a historic position in extrasolar planetary science as the first unambiguously confirmed rocky exoplanet. Located approximately 560 light-years from Earth in the constellation Draco , this extreme terrestrial world orbits a Sun-like G-type star (Kepler-10). While earlier exoplanetary detections predominantly identified massive gas giants, precision transit photometry combined with follow-up radial velocity measurements from the W. M. Keck Observatory allowed astronomers to compute the precise radius and mass of Kepler-10b, confirming a physical structure composed predominantly of iron and silicate rock. With a radius roughly 1.47 times that of Earth and a mass measured at approximately 3.26 Earth masses, Kepler-10b possesses a mean bulk density of roughly 8.8 grams per cubic centimeter. This density significantly exceeds Earth’s average bulk ...