Ultrashort-period (USP) exoplanets have orbital periods shorter than 1 day. Precise masses and radii of USP exoplanets could provide constraints on their unknown formation and evolution processes. We report the detection and characterization of the USP planet GJ 367b using high-precision photometry and radial velocity observations. GJ 367b orbits a bright (V-band magnitude of 10.2), nearby, and red (M-type) dwarf star every 7.7 hours. GJ 367b has a radius of 0.718 ± 0.054 Earth-radii and a mass of 0.546 ± 0.078 Earth-masses, making it a sub-Earth planet. The corresponding bulk density is 8.106± 2.165 grams per cubic centimeter—close to that of iron. An interior structure model predicts that the planet has an iron core radius fraction of 86± 5%, similar to that of Mercury’s interior.
It may interest you
Research led by the University of Oxford and with the participation of the Instituto de Astrofísica de Canarias (IAC) has succeeded in studying, for the first time, the tiny dust molecules known as polycyclic aromatic hydrocarbons (PAHs) in the nuclear region of luminous active galaxies. This work is one of the first studies to use spectroscopic data from the James Webb Space Telescope's (JWST) mid-infrared instrument (MIRI). Observing PAH molecules in the innermost regions of the galaxy is one of the best ways to study the influence of the central black hole in the evolution of the hostAdvertised on
Research by the Dark Energy Survey (DES) collaboration, in which the Instituto de Astrofísica de Canarias (IAC) participates, has confirmed the presence of a supervoid, an extremely large region with a lower-than-average density of matter, in the constellation Eridanus. Its study could provide new clues to understanding the nature of dark energy. The result is published today in Monthly Notices of the Royal Astronomical Society. The possibility of mapping the largest structures in the Universe has always been an aspiration of astrophysics. After the meticulous charting of our cosmic backyardAdvertised on
The study shows the potential of major astronomical observatories to test the laws of physics and to show their universal character. The results are published in The Astrophysical Journal The General Theory of Relativity is one of the basic pillars of modern physics. One of the bases which support Einstein`s theory is the Principle of Equivalence. Using this principle one can infer that light which escapes from a region with a strong gravitational field loses energy as it travels, so that its wavelength shifts to the red. This phenomenon is known as the gravitational redshift, and measuringAdvertised on