Английская Википедия:GJ 3929 b
Шаблон:Short description Шаблон:Infobox planetGJ 3929 b (Gliese 3929 b, TOI-2013 b) is a confirmed exoplanet located 52 light-years away orbiting the red dwarf star GJ 3929.[1] It is an Earth-sized planet, having a radius only 9% larger than that of Earth.[2] It orbits its star at a distance of Шаблон:Convert, being located in the Venus zone of its star, and completes one orbit around it every 2 days and 15 hours.[2] Because of the proximity of its star, and its low mass, GJ 3929 b is classified as a Venus-like planet, having an equilibrium temperature of around 300 °C and receiving planetary insolation 17 times more intense than Earth receives from the Sun.[2]
Characteristics
Size, mass and density
Initially, the radius of GJ 3929 b was calculated at Шаблон:Val, and its mass at Шаблон:Val, giving a density of Шаблон:Val.[3] Later, observations using the NEID spectrometer on the WIYN 3.5 m Telescope measured the planet's mass to be Шаблон:Val; and observations using the ARCTIC imager, plus photometry from TESS and LCOGT, constrained the planet's radius to Шаблон:Val, this time giving a higher density of Шаблон:Val (about 33% larger than Earth'sШаблон:Efn).[2] The characteristics of this planet make it similar to Earth in terms of mass and radius.
Orbit
GJ 3929 b orbits its star at a distance of Шаблон:Convert, which makes it located in its host star's Venus zone, a region where rocky planets would have runaway greenhouse conditions like Venus.[2] GJ 3929 b completes an orbit around its star every 2 days, 14 hours and 47 minutes (2.616 days).[2]
As a terrestrial planet that orbits in the Venus zone of its star, GJ 3929 b classifies as a Venus-like planet, having a planetary equilibrium temperature of 295 °C and receiving planetary insolation 17 times greater than that of Earth receives from the Sun.[2]
Atmosphere
The high density of GJ 3929 b does not suggest a dense atmosphere.[2] Atmospheric scenarios such as a thin atmosphere of volatiles, a thin atmosphere of silicate enriched in refractory elements, or even no atmosphere at all are plausible.[2] Due to its proximity to its star, GJ 3929 b has probably already lost much of its atmosphere since its formation.[2]
GJ 3929 b is an excellent planet for atmospheric study with the James Webb Space Telescope.[2][3] The study of this planet's atmosphere can help reveal the evolutionary history of its planetary system, and provide more information about planetary formation models.[2]
Discovery
GJ 3929 b was discovered by a team of astronomers led by Jonas Kermer, from the Heidelberg University in Germany.[4] They reported a transit signal identified in the host star (GJ 3929)'s light curve detected by NASA's Transiting Exoplanet Survey Satellite (TESS).[4] Afterwards, the planetary nature of this transit signal was confirmed using radial velocity observations with the CARMENES spectrograph, in addition to transit observations made with SAINT-EX and LCOGT.[3][4] The discovery was announced in 2022.[5]
The radial velocity observation with CARMENES also helped discover another planet in the planetary system, GJ 3929 c, a sub-Neptune detected by radial velocity.[3]
Host star
Шаблон:Main article GJ 3929 is a red dwarf of spectral type M3.5V[6] that is located 51.6 light years from Earth, in the constellation Corona Borealis.[1]Шаблон:Efn This star is smaller, cooler and less luminous than the Sun, having a radius of Шаблон:Val, an effective temperature of Шаблон:Convert and a luminosity equivalent to 1% of solar luminosity.[2] Its age is estimated between 2.2 and 11 billion years.[2]
The star also hosts another planet, called GJ 3929 c, a sub-Neptune orbits 3 times further than the innermost planet, at a distance of Шаблон:Convert,[3] but still below the habitable zone.[7]
See also
- Kepler-69c, another Venus-like exoplanet
Notes and references
