NASA’s TESS Discovers Ultra-Compact Triple Star System with Fastest Known Orbit

A team of astronomers has identified a remarkable triple star system that holds the record for the briefest orbital cycle ever recorded. Known as TIC 290061484, this stellar formation was uncovered through data captured by NASA’s Transiting Exoplanet Survey Satellite (TESS), combining cutting-edge AI analysis with contributions from both expert and amateur astronomers. This breakthrough sheds new light on the mechanics governing multiple-star arrangements.

A Stellar Trio with Unprecedented Orbital Speeds

The system features a pair of stars orbiting each other in an astonishingly short 1.8 days, while a third star revolves around this compact duo every 25 days. This outer orbital duration surpasses the previous shortest known period for a triple star system, which stood at 33 days since 1956. Situated within the Cygnus constellation, this unique arrangement has allowed astronomers to precisely determine the orbital paths, masses, and surface temperatures of the trio.

Veselin Kostov, a researcher at NASA’s Goddard Space Flight Center and the SETI Institute, highlighted the importance of the find: “Because the system is compact and oriented edge-on, we can accurately measure the stars’ orbits, dimensions, and temperatures and investigate how such a system formed and will evolve.” The close-knit configuration, all contained within an area smaller than Mercury’s solar orbit, suggests a high level of orbital stability with minimal gravitational disruptions.

Add Cosmo Herald as a Preferred Source

Detecting the System Through Stellar Eclipses

The breakthrough discovery of TIC 290061484 relied on monitoring subtle drops in brightness, or eclipses, when one star passes in front of another, causing temporary dimming. Thanks to TESS' capability to track continuous light fluctuations, astronomers detected these eclipsing events and identified this rare triple system. Intelligent algorithms sifted through immense volumes of data to recognize distinctive patterns, while experienced citizen scientists provided essential manual validation. This collaboration between amateurs and professionals was key to singling out this exceptional system.

Many volunteers had previously contributed to the Planet Hunters initiative and earned co-authorship on the publication. As explained by Saul Rappaport, MIT emeritus physics professor and co-author, “Finding a system like this is exciting because such configurations are seldom detected, though they might actually be more frequent than our current data imply.” Their almost perfectly aligned orbits relative to Earth offered a clear view of the eclipses, enhancing measurement precision.

Advancing the Study of Multi-Star Systems

This landmark discovery paves the way to explore additional triple star systems, especially those with even shorter outer orbits. The forthcoming Nancy Grace Roman Space Telescope, scheduled for launch soon, promises to deliver far sharper stellar images. Equipped with an incredibly detailed sensor array providing 36,000 pixels per area, vastly surpassing TESS’s resolution with just a single pixel, the Roman telescope will delve into crowded galactic zones to uncover more intricate systems.

Brian Powell, data scientist at NASA’s Goddard Space Flight Center, emphasized the telescope’s transformative potential: “Our knowledge about stars concentrated at the galaxy’s core is limited to only the brightest objects. Roman’s superior clarity will enable us to separate light from tightly clustered stars, offering the clearest insight yet into the composition of star clusters in our galaxy.”

Although intense gravitational interactions in this triple system likely preclude the presence of stable planets, it serves as a valuable laboratory for examining stellar formation and evolutionary processes. Scientists anticipate that, as the inner star pair ages, they may eventually merge and provoke a supernova event within the next 20 to 40 million years. Nevertheless, the system remains stable enough for astronomers to continue observing it for millions of years.