Tomasz Nowakowski is a member of the physics.org community.
The discovery of a new super-Earth planet is being reported by an international team of astronomer. The newly discovered alien world is four times larger than our planet. There was a paper published on arXiv.org.
"Super-earths" are planets that are larger than Earth but smaller than Neptune. Astronomers use the term "super-Earth" to describe planets larger than Earth but smaller than the mini-Neptunes.
There is a new planet in the super-Earth class. The RV was measured by using the IRD instrument on the 8.2-m telescope.
There is a significant RV periodicity at 10.75 days for the M 4.5 dwarf Ross 508. The researchers explained that this periodicity has no counterpart in photometry or stellar activity indicators but is well-fit by a new planet.
At a distance of 0.053AU from it, the exoplanet Ross 508 b has a minimum mass of four Earth mass. According to the astronomer, this shows an average insolation of about 1.4 times the Earth's value, placing this planet near the middle of Ross's habitable zone.
Important information about the planet's origin is still unknown, but further studies on this could provide it. According to the researchers, Ross 508 b may have formed beyond the snow line and undergoneType I migration. Density waves can damp an alien world if it is initially high.
A density of 26 g/ cm 3 is achieved by the parent star Ross 508, which has a radius of 0.21 and a mass of 0.18. The metallicity of the star is estimated to be -2.0.
The authors of the paper hope that future surveys with IRD and other high-precision near-infrared spectrographs will allow the discovery of planets around more stars.
The RV search can help find a low-mass planet around a cool M dwarf. The other late-M dwarf RV surveys will use high-dispersion spectrographs and exoplanet surveys will use the transit technique from space.
More information: A Super-Earth Orbiting Near the Inner Edge of the Habitable Zone around the M4.5-dwarf Ross 508, arXiv:2205.11986 [astro-ph.EP] arxiv.org/abs/2205.11986There is a science network.
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