May 20, 2024

In the Search for a “Second Earth,” Astronomers Discover Hot, Dense Planet With Eight-Hour Year

Co-author Dr. Vincent Van Eylen (UCL Mullard Space Science Laboratory) stated: “In this brand-new study, the size and mass of the world were computed using two approaches, both of which involved evaluating the light of the worlds star. One was to determine the minute dip in given off light from the star as the planet passed in front of it. “By measuring the precise fundamental homes of the USP planet, we can get a look of the systems development and evolution history.”.
It is a low-mass rocky planet, however has a greater density than the Earth. “The high density shows the planet is controlled by an iron core,” stated Dr. Szilárd Csizmadia.

Co-author Dr. Vincent Van Eylen (UCL Mullard Space Science Laboratory) stated: “In this brand-new research study, the size and mass of the planet were calculated utilizing two techniques, both of which involved evaluating the light of the worlds star. One was to determine the minute dip in released light from the star as the world passed in front of it. This was done using information from NASAs Transiting Exoplanet Survey Satellite (TESS).
” The other technique was to presume the mass of the planet from the effect it had on the motion of the star. This movement was small– at a rate of 80cm a second, it was no more than walking speed– so its fantastic that we were able to find this tiny motion from 31 light-years away.”.
Artists impression of the newly found world. Credit: SPP 1992 (Patricia Klein).
The research study involved 78 scientists and was led by astronomers at the Institute of Planetary Research at the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR).
Lead author Dr. Kristine Lam, from the DLR, said: “From the exact determination of its radius and mass, GJ 367b is classified as a rocky planet. This puts it amongst the sub-Earth sized terrestrial worlds and brings research one advance in the search for a second Earth.”.
GJ 367 b belongs to the “ultra-short period” (USP) group of exoplanets that orbit their star in less than 24 hours. “We already know a few of these, but their origins are presently unidentified,” said Dr. Lam. “By determining the precise fundamental homes of the USP planet, we can get a glance of the systems development and development history.”.
Following the discovery of this world utilizing TESS and the transit technique, the spectrum of its star was then studied from the ground using the HARPS instrument on the European Southern Observatorys 3.6 m telescope.
With the mix of various assessment methods, the radius and mass of the planet were figured out: its radius is 72 percent of Earths radius, and its mass 55 percent of Earths mass.
By identifying its radius and mass with a precision of 7 and 14 percent respectively, the researchers were also able to reason about the exoplanets inner structure. It is a low-mass rocky world, however has a higher density than the Earth. “The high density suggests the planet is dominated by an iron core,” stated Dr. Szilárd Csizmadia.
” These homes are comparable to those of Mercury, with its disproportionately big iron and nickel core that distinguishes it from other terrestrial bodies in the Solar System.”.
The worlds proximity to its star implies it is exposed to a severe high level of radiation, more than 500 times stronger than what the Earth experiences. The surface temperature could reach up to 1500 degrees Celsius– a temperature at which all rocks and metals would be melted.
This was useful for its discovery as the transit signal of the orbiting world is particularly substantial. This makes their associated planets simpler to define and discover.
Researchers estimate that these red dwarfs, likewise referred to as class M stars, are orbited by an average of two to three worlds, each of which is at the majority of four times the size of Earth.
For more on this discovery, read Sub-Earth Planet Discovered by Astronomers: Boiling New World Is Ultra-Light and Super-Fast.
Recommendation: “GJ 367b: A dense ultra-short duration sub-Earth planet transiting a nearby red dwarf star” by Kristine W. F. Lam, Szilárd Csizmadia, Nicola Astudillo-Defru, Xavier Bonfils, Davide Gandolfi, Sebastiano Padovan, Massimiliano Esposito, Coel Hellier, Teruyuki Hirano, John Livingston, Felipe Murgas, Alexis M. S. Smith, Karen A. Collins, Savita Mathur, Rafael A. Garcia, Steve B. Howell, Nuno C. Santos, Fei Dai, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Simon Albrecht, Jose M. Almenara, Etienne Artigau, Oscar Barragán, François Bouchy, Juan Cabrera, David Charbonneau, Priyanka Chaturvedi, Alexander Chaushev, Jessie L. Christiansen, William D. Cochran, José R. De Meideiros, Xavier Delfosse, Rodrigo F. Díaz, René Doyon, Philipp Eigmüller, Pedro Figueira, Thierry Forveille, Malcolm Fridlund, Guillaume Gaisné, Elisa Goffo, Iskra Georgieva, Sascha Grziwa, Eike Guenther, Artie P. Hatzes, Marshall C. Johnson, Petr Kabáth, Emil Knudstrup, Judith Korth, Pablo Lewin, Jack J. Lissauer, Christophe Lovis, Rafael Luque, Claudio Melo, Edward H. Morgan, Robert Morris, Michel Mayor, Norio Narita, Hannah L. M. Osborne, Enric Palle, Francesco Pepe, Carina M. Persson, Samuel N. Quinn, Heike Rauer, Seth Redfield, Joshua E. Schlieder, Damien Ségransan, Luisa M. Serrano, Jeffrey C. Smith, Ján Šubjak, Joseph D. Twicken, Stéphane Udry, Vincent Van Eylen and Michael Vezie, 2 December 2021, Science.DOI: 10.1126/ science.aay3253.

An illustration of a red dwarf star orbited by an exoplanet. Credit: NASA/ESA/G. Bacon (STScI).
A global team of researchers has discovered a brand-new world, GJ 367 b, whose surface temperature level might reach 1,500 degrees Centigrade– hot adequate to melt all rock and metal– and which takes only 8 hours to orbit its star.
In a new research study, published in the Science journal, the researchers show that the world, which is 31 light-years from Earth, is one of the lightest amongst the almost 5,000 exoplanets (worlds outside our own solar system) that are known today, with half the mass of Earth. It has a size of just over 9,000 kilometers– somewhat larger than Mars.
The team says the research represents a step forward in the look for a “2nd Earth” as it reveals astronomers can identify the properties of even really small planets.