TRAPPIST-1d
TRAPPIST-1d, also known as 2MASS J23062928-0502285 d, is a small exoplanet which is about 40% the mass of the Earth. It orbits on the inner edge of the habitable zone of the ultracool dwarf star TRAPPIST-1. It is located 40.7 light years away from Earth in the constellation of Aquarius. The exoplanet was found by using the transit method, which means the dimming effect that a planet causes as it crosses in front of its star is measured. The first information about the planet were announced in 2016, but it wasn't until the following years that more information about the likely nature of the planet was obtained. TRAPPIST-1d is the second-least massive planet of the TRAPPIST-1 system and is likely to have a thin hydrogen-poor atmosphere that is closely packed together similar to Venus, Earth, or Mars.[6] It gets just 4.3% more sunlight than how much sunlight the Earth gets from the sun, placing it on the inner edge of the habitable zone.[7] It has about less than 5% of its mass as a volatile layer, which could consist of atmosphere, oceans, and/or ice layers.[2] A 2018 study by the University of Washington came to a opinion that TRAPPIST-1d might be a Venus-like exoplanet with an uninhabitable atmosphere.[8] The planet is an eyeball planet candidate.[9]
 Artist's impression of TRAPPIST-1d (February 2018). | |
| Discovery[1] | |
|---|---|
| Discovered by | Michaël Gillon et al. |
| Discovery site | TRAPPIST |
| Discovery date | May 2, 2016 |
| Transit | |
| Orbital characteristics[4] | |
| 0.02227±0.00019 AU | |
| Eccentricity | 0.00837±0.00093[2] |
| 4.049219±0.000026 d | |
| Inclination | 89.896°±0.077° |
| −8.73°±6.17°[2] | |
| Star | TRAPPIST-1[3] |
| Physical characteristics[4] | |
Mean radius | 0.788+0.011 −0.010 R🜨 |
| Mass | 0.388±0.012 M🜨 |
Mean density | 4.354+0.156 −0.163 g/cm3 |
| 0.624±0.019 g 6.11±0.19 m/s2 | |
| Temperature | Teq: 286.2±2.8 K (13.1 °C; 55.5 °F)[5] |
TRAPPIST-1d Media
Artist's impression of the TRAPPIST-1 planetary system.
References
- ↑ Gillon, Michaël. Temperate Earth-sized planets transiting a nearby ultracool dwarf star (in en). Nature 533 (7602) (May 2016). p. 221–224. doi:10.1038/nature17448.
- ↑ 2.0 2.1 2.2 Grimm, Simon L.. The nature of the TRAPPIST-1 exoplanets. Astronomy & Astrophysics 613 (5 February 2018). p. A68. doi:10.1051/0004-6361/201732233.
- ↑ Van Grootel, Valerie. Stellar Parameters for Trappist-1. The Astrophysical Journal 853 (1) (5 December 2017). p. 30. doi:10.3847/1538-4357/aaa023.
- ↑ 4.0 4.1 Agol, Eric. Refining the Transit-timing and Photometric Analysis of TRAPPIST-1: Masses, Radii, Densities, Dynamics, and Ephemerides (in en). The Planetary Science Journal 2 (1) (1 February 2021). p. 1. doi:10.3847/psj/abd022.
- ↑ Ducrot, E.. TRAPPIST-1: Global results of the Spitzer Exploration Science Program Red Worlds (in en). Astronomy & Astrophysics 640 (1 August 2020). p. A112. doi:10.1051/0004-6361/201937392.
- ↑ February 2018, Elizabeth Howell 07. Rocky-Planet-Like Atmospheres Are Possible on 3 TRAPPIST-1 Planets (in en). Space.com (7 February 2018). Retrieved 2021-02-10.
- ↑ Delrez, Laetitia. Early 2017 observations of TRAPPIST-1 with Spitzer. Monthly Notices of the Royal Astronomical Society 475 (3) (9 January 2018). p. 3577–3597. doi:10.1093/mnras/sty051.
- ↑ Study brings new climate models of small star TRAPPIST 1's seven intriguing worlds. Retrieved 2023-05-12.
- ↑ Anders, Charlie Jane. The Bizarre Planets That Could Be Humanity's New Homes (in en). The Atlantic (2019-02-13). Retrieved 2021-02-10.
