GJ 3929 b

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GJ 3929 b
Discovery
Transit
Designations
Gliese 3929 b, TOI 2013 b, G 180-18 b[3]
Orbital characteristics[4]
0.0252±0.0005 AU
Eccentricity0 (fixed)
2.616 d
Inclination88.442°±0.008°
StarGJ 3929
Physical characteristics[4]
Mean radius
1.09±0.04 R🜨
Mass1.75+0.44
−0.45 M🜨
Mean density
7.3±2.0 g/cm3
Temperature568±6 K (295 °C)

GJ 3929 b (Gliese 3929 b, TOI-2013 b) is a confirmed exoplanet located 52

insolation 17 times more intense than Earth receives from the Sun.[4]

Characteristics

Size, mass and density

Initially, the radius of GJ 3929 b was calculated at 1.15±0.04 

LCOGT, constrained the planet's radius to 1.09±0.04 R🜨, this time giving a higher density of 7.3±2 g/cm3 (about 33% larger than Earth's[a]).[4] 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 0.0252

rocky planets would have runaway greenhouse conditions like Venus.[4] GJ 3929 b completes an orbit around its star every 2 days, 14 hours and 47 minutes (2.616 days).[4]

As a

insolation 17 times greater than that of Earth receives from the Sun.[4]

Atmosphere

The high density of GJ 3929 b does not suggest a dense atmosphere.

formation.[4]

GJ 3929 b is an excellent planet for atmospheric study with the James Webb Space Telescope.[4][5] 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.[4]

Artist's impression and size comparison of the two planets in the GJ 3929 system with Earth

Discovery

GJ 3929 b was discovered by a team of astronomers led by Jonas Kermer, from the

LCOGT.[5][2] The discovery was announced in 2022.[1]

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.[5]

Host star

Main article: GJ 3929

GJ 3929 is a

spectral type M3.5V[7] that is located 51.6 light years from Earth, in the constellation Corona Borealis.[3][note 1] This star is smaller, cooler and less luminous than the Sun, having a radius of 0.32 R☉, an effective temperature of 3,384 K (3,111 °C) and a luminosity equivalent to 1% of solar luminosity.[4] Its age is estimated between 2.2 and 11 billion years.[4]

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 0.081 astronomical units (12,100,000 km),[5] but still below the habitable zone.[8]

See also

Notes and references

  1. ^ a b "GJ 3929 b". NASA Exoplanet Exploration. Retrieved January 4, 2023.
  2. ^ a b c d "Hot Earth-sized exoplanet detected with TESS". phys.org. Retrieved 2024-01-04.
  3. ^ a b c "★ Gliese 3929". Stellar Catalog. Retrieved 2024-01-01.
  4. ^
    ISSN 0004-637X
    .
  5. ^
    ISSN 0004-6361
    .
  6. ^ "Facts About Earth - NASA Science". science.nasa.gov. Retrieved 2023-12-04.
  7. ^ a b "G 180-18". SIMBAD. Retrieved January 4, 2023.
  8. ^ "Open Exoplanet Catalogue - GJ 3929 b". www.openexoplanetcatalogue.com. Retrieved 2024-01-03.
  1. ^ Obtained with a right ascension of 15h 58m 18.8s and a declination of +35° 24′ 24.3″[7] on this website.
  1. ^ The density of Earth is 5.513 g/cm³.[6]
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