Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Crater [1] |
Right ascension | 11h 02m 45.95462s [2] |
Declination | −16° 24′ 22.2882″ [2] |
Apparent magnitude (V) | 16.9±0.2 [3] |
Characteristics | |
Evolutionary stage | Red dwarf ( main sequence) |
Spectral type | M6.1±0.7V [3] |
Astrometry | |
Proper motion (μ) |
RA: -221.291
mas/
yr
[2] Dec.: -58.841 mas/ yr [2] |
Parallax (π) | 37.5225 ± 0.0392 mas [2] |
Distance | 86.92 ± 0.09
ly (26.65 ± 0.03 pc) |
Details [3] | |
Mass | 0.139±0.005 M☉ |
Radius | 0.17±0.018 R☉ |
Temperature | 2960±55 K |
Metallicity [Fe/H] | -0.09±0.19 dex |
Age | 0.5±0.064 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
LP 791-18 (TOI-736) is a cool M dwarf star in the constellation Crater, located 26.65 parsecs (86.9 light-years) away from Earth. [3]
The star is one of the smallest known to host exoplanets. [5] In 2019 two exoplanets in transit around it were announced by TESS, [3] and a third planet was discovered in Spitzer Space Telescope data in 2023. [5]
The innermost planet, b, is a super-Earth and the outermost planet, c, is a mini-Neptune. They were discovered together in 2019. [3] The middle planet, d, is an Earth-mass world discovered in 2023. It may potentially be tidally heated by interactions with planet c, which would lead to abundant volcanoes similar to Jupiter's moon Io. [5] As the planet d is in the inner edge of the habitable zone, liquid water could condense on the side of the planet that faces away from the host star. [6]
In 2021 planet c was suggested for atmospheric analysis by the James Webb Space Telescope. [7]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | — | 0.00978±0.00012 | 0.9479981±0.0000021 | — | 88.37+0.94 −0.95 ° |
1.212+0.059 −0.058 R🜨 |
d | 0.9+0.5 −0.4 M🜨 |
0.01992±0.00014 | 2.753436±0.000013 | 0.0015±0.00014 | 89.34±0.41 ° | 1.032+0.044 −0.043 R🜨 |
c | 7.1±0.7 M🜨 | 0.02961+0.00035 −0.00036 |
4.9899093+0.0000074 −0.0000072 |
0.00008±0.00004 | 89.78±0.13 ° | 2.438±0.096 R🜨 |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Crater [1] |
Right ascension | 11h 02m 45.95462s [2] |
Declination | −16° 24′ 22.2882″ [2] |
Apparent magnitude (V) | 16.9±0.2 [3] |
Characteristics | |
Evolutionary stage | Red dwarf ( main sequence) |
Spectral type | M6.1±0.7V [3] |
Astrometry | |
Proper motion (μ) |
RA: -221.291
mas/
yr
[2] Dec.: -58.841 mas/ yr [2] |
Parallax (π) | 37.5225 ± 0.0392 mas [2] |
Distance | 86.92 ± 0.09
ly (26.65 ± 0.03 pc) |
Details [3] | |
Mass | 0.139±0.005 M☉ |
Radius | 0.17±0.018 R☉ |
Temperature | 2960±55 K |
Metallicity [Fe/H] | -0.09±0.19 dex |
Age | 0.5±0.064 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
LP 791-18 (TOI-736) is a cool M dwarf star in the constellation Crater, located 26.65 parsecs (86.9 light-years) away from Earth. [3]
The star is one of the smallest known to host exoplanets. [5] In 2019 two exoplanets in transit around it were announced by TESS, [3] and a third planet was discovered in Spitzer Space Telescope data in 2023. [5]
The innermost planet, b, is a super-Earth and the outermost planet, c, is a mini-Neptune. They were discovered together in 2019. [3] The middle planet, d, is an Earth-mass world discovered in 2023. It may potentially be tidally heated by interactions with planet c, which would lead to abundant volcanoes similar to Jupiter's moon Io. [5] As the planet d is in the inner edge of the habitable zone, liquid water could condense on the side of the planet that faces away from the host star. [6]
In 2021 planet c was suggested for atmospheric analysis by the James Webb Space Telescope. [7]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | — | 0.00978±0.00012 | 0.9479981±0.0000021 | — | 88.37+0.94 −0.95 ° |
1.212+0.059 −0.058 R🜨 |
d | 0.9+0.5 −0.4 M🜨 |
0.01992±0.00014 | 2.753436±0.000013 | 0.0015±0.00014 | 89.34±0.41 ° | 1.032+0.044 −0.043 R🜨 |
c | 7.1±0.7 M🜨 | 0.02961+0.00035 −0.00036 |
4.9899093+0.0000074 −0.0000072 |
0.00008±0.00004 | 89.78±0.13 ° | 2.438±0.096 R🜨 |