TRAPPIST-1 b is the exoplanet of the star TRAPPIST-1 in the constellation Aquarius , which has a size close to the size of the Earth . Closest to a star of seven planets in the system . It was discovered on May 2, 2016 using the TRAPPIST telescope together with the planets TRAPPIST-1 c and TRAPPIST-1 d [1] [2] [3] . The parameters were clarified at a NASA press conference on February 22, which also reported the discovery of the planets e , f , g and h [4] [5] [6] , as well as after the publication of data collected by the Kepler telescope [7] .
| TRAPPIST-1 b | |
|---|---|
| Exoplanet | |
 TRAPPIST-1 b as presented by the artist. | |
| Parent star | |
| Star | TRAPPIST-1 |
| Elements of the orbit | |
| Semimajor axis ( a ) | 0.01111 a. e. |
| Eccentricity ( e ) | 0.019 (8) |
| Orbital Period ( P ) | 1,5108739 (75) d. |
| Inclination ( i ) | 89.65 ± 0.27 ° |
| physical characteristics | |
| Weight ( m ) | 0.79 ± 0.27 M ⊕ |
| Radius ( r ) | 1,086 (35) R ⊕ |
| Density ( ρ ) | 3.4 ± 1.2 g / cm 3 |
| Temperature ( T ) | +127 ° C 400 K |
| Discovery Information | |
| opening date | May 2, 2016 |
| Detection method | Transit method |
| Other designations | |
| • 2MASS J23062928-0502285 b • WISE J230630.02-050234.1 b • EPIC 246199087 b | |
Content
Features
Parent Star
The planet revolves around the ultracold dwarf star TRAPPIST-1 spectral class M. The star has a mass of 0.08 M ☉ and a radius of 0.11 R ☉ . The surface temperature is 2559 ± 50 K (approximately 2290 ° C ). The star is at least 500 million years old. For comparison, the surface temperature of the Sun is 5778 K and its age is about 4.6 billion years. TRAPPIST-1 has a metallicity close to solar: [Fe / H] = 0.04 ± 0.08 (or from 91% to 132% solar metallicity), and the luminosity is only 0.052% of solar luminosity . Due to the low luminosity, the apparent stellar magnitude of TRAPPIST-1 is 18.8 m [8] , that is, the star cannot be seen with the naked eye or in the average amateur telescope.
| Land | TRAPPIST-1 b |
|---|---|
Physical Characteristics
TRAPPIST-1 b has dimensions close to Earth - its radius is 1,086 R ⊕ . However, the mass is much smaller - only 0.79 M ⊕ . According to these data, the average density was found to be approximately 3.4 g / cm 3 . Such a low value with high probability indicates a significant content of water and / or other light substances in the composition of the planet. The estimated surface temperature without taking into account the greenhouse effect of the atmosphere is +127 ° C [7] . Mass and density were known with large errors [6] before the publication of data made by the Kepler telescope [7] .
Orbit Parameters
All planets of the TRAPPIST-1 system have an orbit very close to circular. TRAPPIST-1 b makes a revolution around the star in about a day and a half, and the radius of the orbit is almost 100 times smaller than the Earth’s [8] [5] .
Notes
- ↑ Gillon M. et al. Temperate Earth-sized planets transiting a nearby ultracool dwarf star (Eng.) // Nature. - 2016. - Vol. 533. - Iss. 7602 . - P. 221-224. - ISSN 0028-0836 . - DOI : 10.1038 / nature17448 .
- ↑ Astronomers immediately found three exoplanets in the potentially habitable zone TRAPPIST-1 (Russian) // N + 1. - 2016 .-- May 3.
- ↑ Three potentially inhabited worlds discovered around a nearby ultracold red dwarf // English Southern Observatory. - 2016 .-- May 2.
- ↑ A system with seven earth-like exoplanets (rus.) // N + 1 was found. - 2017 .-- February 22.
- ↑ 1 2 NASA telescope opens the largest batch of planets the size of the Earth in the habitable zone around one star. , NASA (02.22-2017).
- ↑ 1 2 Gillon M. et al. Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1 (Eng.) // Nature. - 2017 .-- Vol. 542. - Iss. 7642 . - P. 456-460. - ISSN 0028-0836 . - DOI : 10.1038 / nature21360 . - arXiv : 1703.01424 .
- ↑ 1 2 3 Updated Masses for the TRAPPIST-1 Planets (English) // arXiv. - 2017 .-- April 13.
- ↑ 1 2 Planet TRAPPIST-1 b . The Extrasolar Planets Encyclopaedia (February 22, 2017).