Gliese 3470 b

Gliese 3470 b
Exoplanet List of exoplanets

Size comparison of Gliese 3470 b with Earth.
Parent star
Star Gliese 3470
Right ascension (α) 07h 59m 0.60s
Declination (δ) +15° 23′ 30″
Apparent magnitude (mV) 12.27
Mass (m) 0.539 M☉
Radius (r) 0.568 R☉
Temperature (T) 3600 K
Metallicity [Fe/H] 0.2±0.10
Age 1 Gyr
Physical characteristics
Mass(m)13.73±1.61[1] M⊕
Radius(r)3.88±0.32 R⊕
Density(ρ)1.18±0.33 g cm−3
Temperature (T) 604±98
Orbital elements
Semi-major axis(a) 0.031±0.0028 AU
Eccentricity (e) 0.017+0.016
−0.012
Orbital period(P) 3.3366487+0.0000043
−0.0000033 d
Inclination (i) 88.88+0.62
−0.45°
Discovery information
Discovery date 2012
Discoverer(s) X. Bonfils et. al [2]
Discovery method Radial velocity
Discovery status Confirmed

Gliese 3470 b, abbreviated as GJ3470b, is an exoplanet orbiting the star Gliese 3470, both of which are located in the constellation Cancer. With a mass of just under 14 Earth-masses and a radius approximately 4.3 times that of Earth's, it is likely something akin to a mini-Neptune despite the initially strong belief that the planet was not covered in clouds like the gas giants we are familiar with in our solar system. The exoplanet’s atmosphere was first observed by researchers Akihiko Fukui, Norio Narita and Kenji Kuroda at the University of Tokyo in 2013, and afterwards, Fukui commented, "Suppose the atmosphere consists of hydrogen and helium, the mass of the atmosphere would be 5-20% of the total mass of the planet. Comparing that to the fact that the mass of Earth's atmosphere is about one ten-thousandth of a percent (0.0001%) of the total mass of the Earth, this planet has a considerably thick atmosphere." Recently in 2015, a team using the Las Cumbres Observatory Global Telescope (LCOGT) network reported their detection of Rayleigh scattering in the atmosphere of this planet.[3] In the Las Cumbres researchers' paper published in The Astrophysical Journal, they conclude that the most plausible explanation for the scattering effect to be an atmosphere made predominantly of hydrogen and helium, causing the exoplanet to be veiled by dense clouds and hazes. It is thought that the planet would appear blue to the human eye due to this scattering. As of now, GJ3470b is the only exoplanet orbiting the Gliese 3470 star that has been observed and analyzed by astronomers and astrophysicists.[4]

References

This article is issued from Wikipedia - version of the 12/4/2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.