TOI-700 d
TESS's first Earth-size habitable-zone discovery.
M2 red dwarf · orbits TOI-700 · discovered 2020
The exact inputs the model saw
14 features, in the model's own order: your 4 profile preferences, then this world's 10 published physical parameters.
| feature | wire name | value | unit |
|---|---|---|---|
| Preferred star temperatureyours | prof_target_teff | 4400 | K |
| Preferred sunlightyours | prof_target_insol | 1 | × Earth |
| Max distanceyours | prof_max_dist | 150 | light-years |
| Size preferenceyours | prof_size_focus | 1 | Earth radii |
| Planet radius | pl_rade | 1.07 | Earth radii |
| Planet mass | pl_masse | 1.57* | Earth masses |
| Equilibrium temperature | pl_eqt | 269 | K |
| Sunlight received | pl_insol | 0.87 | × Earth flux |
| Orbital period | pl_orbper | 37.42 | days |
| Orbit semi-major axis | pl_orbsmax | 0.163 | AU |
| Star temperature | st_teff | 3480 | K |
| Star radius | st_rad | 0.42 | Solar radii |
| Star mass | st_mass | 0.416 | Solar masses |
| Distance from Earth | sys_dist | 101.4 | light-years |
*published mass–radius estimate — no radial-velocity mass measured yet.
From the research corpus
Passages that ship inside the model's IPFS bundle — real citations, content-addressed with the model itself.
“TOI-700 d was announced on 3 January 2020 as NASA's Transiting Exoplanet Survey Satellite (TESS) finding its first Earth-size planet in its star's habitable zone, the range of distances where liquid water could exist on the surface. TOI-700 d is the outermost of multiple confirmed planets orbiting TOI-700, a small, cool M-dwarf star located just over 100 light-years away (about 101 light-years) in the southern constellation Dorado. The…”
NASA Planet Hunter Finds its 1st Earth-size Habitable-zone World · TESS discovery announcement
“TOI-700 d measures about 20 percent larger than Earth (a radius near 1.14 Earth radii) and orbits its star every 37 days, receiving from its star about 86 percent of the energy that the Sun provides to Earth. This insolation places it within the conservative part of the habitable zone, where an Earth-like atmosphere would yield temperate surface conditions. The planet's estimated mass is near 1.7 Earth masses, consistent with a dense,…”
NASA's TESS Discovers Planetary System's Second Earth-Size World · TOI-700 d size, orbit, and insolation
“TOI-700 d was discovered by TESS and confirmed using NASA's Spitzer Space Telescope, which observed additional transits to validate the signal. The host star had initially been misclassified as larger and hotter than it actually is, which would have made the planets appear larger and warmer; a high-school student working with the team, Alton Spencer, helped identify the misclassification, and correcting it revealed the star to be a…”
NASA Planet Hunter Finds Earth-Size Habitable-Zone World · Spitzer confirmation, stellar reclassification, tidal locking
“Because TOI-700 d is close enough and orbits a well-characterized star, scientists modeled its potential climates to inform future observations. Researchers created 20 potential environmental models spanning very different surface and atmospheric assumptions. One scenario depicted an ocean-covered TOI-700 d with a dense, carbon-dioxide-dominated atmosphere and a deep cloud layer over the tidally locked dayside; another showed a…”
The First Habitable-zone Earth-sized Planet from TESS. III. Climate States and Characterization Prospects for TOI-700 d · Climate-state modeling