TRAPPIST-1c
{{short description|Rocky exoplanet orbiting TRAPPIST-1}}
{{Use dmy dates|date=February 2017}}
{{Infobox planet
| name = TRAPPIST-1c
| image = File:Rocky Exoplanet TRAPPIST-1 c (Artist Concept).jpg
| caption = Artist's impression of TRAPPIST-1c (June 2023) with TRAPPIST-1b in the background
| discoverer = Michaël Gillon et al.
| discovery_site = TRAPPIST
| discovered = May 2, 2016
| discovery_method = Transit
| atmosphere_composition = None or extremely thin
| apsis = astron
| aphelion =
| perihelion =
| semimajor = {{val|0.01580|0.00013|ul=AU}}
| eccentricity = {{val|0.00654|0.00188}}
| period = {{val|2.421937|0.000018|ul=d}}
| inclination = {{val|89.778|0.118|u=deg}}
| arg_peri = {{val|282.45|17.10|u=deg}}
| star = TRAPPIST-1
| mean_radius = {{val|1.097|0.014|0.012|ul=Earth radius}}
| mass = {{val|1.308|0.056|ul=Earth mass}}
| density = {{val|5.447|0.222|0.235|ul=g/cm3}}
| surface_grav = {{val|1.086|0.043}} g
{{val|10.65|0.42|ul=m/s2}}
| single_temperature = {{val|339.7|3.3|ul=K}} ({{convert|339.7|K|C F|disp=out}}, equilibrium)
{{val|380|31|ul=K}} ({{convert|380|K|C F|disp=out}}, surface)
}}
TRAPPIST-1c is a mainly rocky exoplanet orbiting around the ultracool dwarf star TRAPPIST-1, located {{convert|40.7|ly|pc|lk=on|abbr=off}} away from Earth in the constellation Aquarius. It is the third most massive and third largest planet of the system, with about 131% the mass and 110% the radius of Earth. Its density indicates a primarily rocky composition, and observations by the James Webb Space Telescope announced in 2023 suggests against a thick CO2 atmosphere, however this does not exclude a thick abiotic oxygen-dominated atmosphere as is hypothesized to be common around red dwarf stars.
Physical characteristics
=Mass, radius, and temperature=
TRAPPIST-1c was observed with the transit method, which enabled scientists to calculate its radius. Transit-timing variations and computer simulations were able to determine the mass, density, and gravity of the planet. TRAPPIST-1c is the third-largest planet of the TRAPPIST-1 system, with a radius of {{val|1.097|ul=Earth radius}}. It is also the third-most massive of the system, with a mass of {{val|1.308|ul=Earth mass}}, slightly lower than that of the next most massive, TRAPPIST-1g. Initial estimates suggested that TRAPPIST-1c has a lower density (4.89 g/cm3) and gravity (0.966g) than Earth, consistent with a rock-based composition and a thick, Venus-like atmosphere. However, refined density estimates show that the planet's density is similar to Earth.
TRAPPIST-1c's atmosphere was expected to be large enough to raise its surface temperature far above the calculated {{convert|334.8|K|C F}} equilibrium temperature. However, an observation of the secondary eclipse of TRAPPIST-1c by the James Webb Space Telescope, announced in 2023, suggests against a thick CO2 atmosphere, however this does not exclude a thick abiotic oxygen dominated atmosphere as is hypothesized to be Common around Red dwarf stars, with a measured surface temperature of {{convert|380|K|C F}}. In addition, the planet may be very geologically active due to tidal squeezing similar to Jupiter's moon Io, which happens to have a similar orbital period and eccentricity (see TRAPPIST-1#Resonance and tides for references).
=Orbit=
The orbit of TRAPPIST-1c is very close to its host star. One year on the planet lasts a mere 2.42 days (58 hours), a fraction as long as that of the Solar System's innermost planet, Mercury, at 176 days. The planet orbits at a distance of 0.0158 AU, which is about 1.6% the distance between Earth and the Sun. At this proximity, TRAPPIST-1c is most likely tidally locked. However, due to the small size of its host star, the planet only receives about 2.1 times the sunlight as Earth (similar to Venus, at 1.9 times). Its orbital eccentricity is very low at 0.00654, similar to that of TRAPPIST-1b.
=Host star=
TRAPPIST-1c orbits the ultracool red-dwarf star TRAPPIST-1. It is {{solar radius|0.121}} and {{solar mass|0.089}}, with a temperature of 2511 K and an age between 3 and 8 billion years. For comparison, the Sun has a temperature of 5778 K and is about 4.5 billion years old. TRAPPIST-1 is also very dim, with about 0.0005 times (0.05%) the luminosity of the Sun. It is too faint to be seen with the naked eye, having an apparent magnitude of 18.80.
=Atmosphere=
The combined transmission spectrum of TRAPPIST-1 b and c rules out a cloud-free hydrogen-dominated atmosphere for each planet, so they are unlikely to harbor an extended gas envelope. Prior to JWST observations, other atmospheres, from a cloud-free water-vapor atmosphere to a Venus-like atmosphere, remained consistent with the featureless spectrum.
In 2018, the composition of TRAPPIST-1c was determined, and has been found to be rock-based. The presence of an atmosphere could not be confirmed.{{Cite web|last=Landau|first=NASA, Liz|title=New clues to compositions of TRAPPIST-1 planets|url=https://exoplanets.nasa.gov/news/1481/new-clues-to-compositions-of-trappist-1-planets/|access-date=2021-05-21|website=Exoplanet Exploration: Planets Beyond our Solar System}} An observation of the secondary eclipse of TRAPPIST-1c by the James Webb Space Telescope, announced in 2023 rules out a thick carbon dioxide atmosphere like that of Venus. This is similar to JWST results on the inner planet TRAPPIST-1b announced earlier the same year, which suggest that it does not have a thick CO2 dominated atmosphere. In 2024, transmission spectra of the planet had ruled out a hydrogen-dominated atmosphere with >3σ confidence and an atmosphere rich in water, ammonia or carbon monoxide with a pressure of 1 bar when taking into account stellar contamination.
See also
References
{{Reflist|refs=
{{cite web |url=https://webbtelescope.org/contents/news-releases/2023/news-2023-110 |title=NASA's Webb Measures the Temperature of a Rocky Exoplanet |date=27 March 2023 |website=webbtelescope.org |publisher=STScI |access-date=27 March 2023}}
{{cite web |url=https://webbtelescope.org/contents/news-releases/2023/news-2023-125 |title=Webb Rules Out Thick Carbon Dioxide Atmosphere for Rocky Exoplanet |date=19 June 2023 |website=webbtelescope.org |publisher=STScI |access-date=19 June 2023}}
{{cite journal |last1=Zieba |first1=Sebastian |last2=Kreidberg |first2=Laura |last3=Ducrot |first3=Elsa |last4=Gillon |first4=Michaël |display-authors=etal |date=June 2023 |title=No thick carbon dioxide atmosphere on the rocky exoplanet TRAPPIST-1 c |journal=Nature |volume= 620|issue= 7975|pages= 746–749|doi=10.1038/s41586-023-06232-z |pmid=37337068 |pmc=10447244 |arxiv=2306.10150|bibcode=2023Natur.620..746Z |s2cid=259200424 }}
}}
{{TRAPPIST-1}}
{{Exoplanet}}
{{2016 in space}}{{2023 in space}}
{{Aquarius (constellation)}}
{{Portal bar|Astronomy|Biology|Space}}
{{DEFAULTSORT:TRAPPIST-1c}}
Category:Exoplanets discovered in 2016
Category:Near-Earth-sized exoplanets
Category:Transiting exoplanets