Représentation artistique de la surface de TOI-1452 b, qui pourrait être une « planète océan », c’est-à-dire une planète entièrement recouverte d’une épaisse couche d’eau liquide. © Benoit Gougeon, Université de Montréal

An oceanic exoplanet 100 light years from the Sun?

#oceanic #exoplanet #light #years #Sun

We remember the event represented by the first photo of an exoplanetary system in 2008. It involved taking pictures of exoplanets in motion around thestar HR 8799 taken by him astronomers Québécois René Doyon, David Lafrenière and Christian Marois. Today is charles caddieuxdoctoral student at the University of Montreal, member of the Exoplanet Research Institute (iREx), which is being discussed with the international team he led and which today publishes an article in the famous journal astronomical diary.

This is a remarkable discovery as one can see by reading the open access article at arXiv and will certainly please the readers of theInccal, the famous French science fiction comic written by Alexandro Jodorowsky and drawn by Mœbius. Surely they will think of the prison planet.acuaend as astronomers are now reporting the discovery just 100 light-years from Earth of what appears to be a ocean planet.

Rendering of exoplanet TOI-1452 b, a potentially water-covered small planet revealed by an international team of researchers led by Charles Cadieux, a doctoral student at the University of Montreal and a member of the Exoplanet Research Institute (IRex). © Benoît Gougeon, University of Montreal

Here is a list of celestial objects that can be referred to as a star (not…” data-image=” c/ 6cc6562b02_127395_astre-c-esa-hubble-nasa.jpg” data-url=”” data-more=”Read More”>star pretender to this title is called TOI-1452 by, as its name indicates (Tess Object of Interest YOU), was initially expelled by the NASA’s Tess Satellite using the method of transit. This method gives a radius and a period of revolution of the Earth.
In celestial mechanics, we call “revolutionary motion” a periodic circular or elliptical displacement such as…” data-image=” 4 /93429f5b28_79789_periode-revolution.jpg” data-url=”” data-more=”Read more”>orbital period for an exoplanet. It can be completed by determining a dough using the radial velocity method. Masses and radii that give a density, then we can argue that an exoplanet is or is not an ocean planet if it is also at a distance from its host star, which makes the existence of water possible in theory. liquid — this is not self-evident because it is also necessary to take into account the existence of a atmosphere and of a possible greenhouse effect.

TOI-1452 b is in the constellation of the Dragon but before concluding that it was perhaps an ocean planet, it was necessary to verify that it already existed in orbit around one of the little stars of a binary system observed by tesswith a size about 70% larger than the Earth and an orbital period around a Since their luminosity is very low (about 1% at most that of the Sun), the smallest of them must…” data-image =”” data-url=”https:// .com /science/definitions/astronomy-red-dwarf-31/” data-more=”Read more”>red dwarf only eleven days.

The Mont-Mégantic Observatory is a world-class astronomical research facility located in the first International Dark Sky Reserve. Soon you will be able to visit it virtually sitting comfortably from your sofa. Here’s a taste! © Emir Chouchane, University of Montreal

Doppler transits and shifts

Charles Cadieux and his colleagues first confirmed the occurrence of the transit with the Pesto camera (by Planets In 1995 the first extrasolar planet was discovered in…” data-url=”” data-more=”Read More”>Extra Solar in Transits and Occultations) designed by David Lafrenière and his doctoral student François-René Lachapelle, both from the University of Montreal. It is installed in the telescope of the Mont-Mégantic Observatory, located in Estrie.

It remained to determine the mass and this was made possible with the spectropolarimeter infrared (SPIRou), an instrument developed in collaboration, in particular, by the University of Montreal and researchers from the Institut de Recherches en Astrophysics and Planetology of Toulouse. East spectrographinstalled in Hawaii on the Canada-France-Hawaii Telescope, makes it possible to measure the radial velocity in the infrared by Doppler effect on low-mass stars with enough precision to detect Earth-sized planets in the habitable zone.

The exoplanet TOI-1452 b is one of the best candidates for the title of “ocean planet” that we know of. The radius and mass of the planet suggest a density lower than the expected value for a planet that, like the Earth, would essentially be made up of: In contact with an acid, a metal gives a salt; in contact with oxygen, it gives an oxide (with difficulty for “noble metals” such as gold,…” data-url=” “data-more=”Read more”>rails and rock “, explains Charles Cadieux in an iREx press release.

Methods for detecting exoplanets have diversified greatly since the 1990s. They can be classified into two main categories, direct methods and indirect methods. The three main methods are the direct image method, the indirect transit method, and the indirect radial velocity method. Discover exoplanets through our 9-episode web series. A video that is found every week on our YouTube channel. A playlist proposed by the CEA and the University of Paris-Saclay as part of the European research project H2020 Exoplanets-A. © CEA Research

An atmosphere and an ocean to study with the JWST?

I am extremely proud of this discovery because it highlights the quality of the astronomers and the instruments here. Without the Mont-Mégantic Observatory, the SPIRou instrument designed in our laboratories, and an innovative analysis method developed by our research staff, we would not have been able to discover this unique exoplanet. “, he always explains in the same press release for his part Rene Doyonprofessor at the University of Montreal and director of iREx and the Mont-Mégantic Observatory (OMM).

René Doyon being also the principal investigator of NIRISSone of the four scientific instruments of the James Webb Space Telescope (JWST), adds that “ Observations with Webb will be essential to better and more precisely determine the nature of TOI-1452 b. As soon as we can, we will request time to observe this strange planet. “.

In this regard, it is interesting to know that, according to Mykhaylo Plotnykov and Diana Valencia from the University of Toronto, two specialists in models of the internal structure of exoplanets, the fraction of the water mass of TOI-1452 b could reach 30%, that we already observed with some of the A moon with a lowercase “L” is the satellite of a planet. For example Phobos and Deimos are the two moons of the planet Mars.
The Moon with a capital “L” is the only natural satellite of the Earth; probably the result of a collision 4.4 years ago…” data-image=” .jpg ” data-url=”” data-more=”Read more”>moons of Jupiter Y SaturnWhat Ganymede Y Enceladus.

It bodes well for him.exobiology because, with a distance of only 100 light years from the Solar systemthe exoplanet is somehow within range of the instruments of the JWST capable of characterizing its atmosphere.

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