TOI-1080 b: a small rocky planet around a quiet M4V star is validated for detailed study

Star system: SIPS J1825-5212 | Distance from the Sun: 83.3 light years

Researchers have detected and validated TOI-1080 b (SIPS J1825-5212 b), a small, temperate exoplanet that transits its quiet M4V host star every 3.97 days. The host star is located 25.6 parsecs away. The planet was first identified by the TESS mission and confirmed with both TESS and ground-based observations. Analysis of the light curves shows that TOI-1080 b has a radius of about 1.2 times that of Earth and an equilibrium temperature of 368 kelvin. Radial velocity measurements set an upper limit on the planet’s mass at 10.7 Earth masses.
Further tests ruled out the presence of additional transiting planets in the system with radii down to 0.9 Earth radii and periods between 0.5 and 7.7 days, as well as planets larger than 1.4 Earth radii for periods up to 19 days. TOI-1080 b is highly suitable for mass and atmospheric characterization, making it an exceptional target for the JWST+HST Rocky Worlds DDT programme. Its priority score is higher than most other targets currently under investigation, and it joins the sample of nearby benchmark planets accessible for detailed study with JWST.
Key findings
TOI-1080 b is a small, temperate rocky planet validated around a quiet M4V star.
The planet is highly amenable to mass and atmospheric characterization.
TOI-1080 b is a top-priority target for the JWST+HST Rocky Worlds programme and joins the sample of benchmark planets for future studies.

Scientific study

TOI-1080 b: a temperate, rocky planet orbiting a quiet M4V host (external link)