Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.
Illustration shows a sub-Neptune planet orbiting a yellow star. Whether this planet is puffy depends on its resonance.Sub-Neptune planets that dance in time with the rest of their planetary systems are less dense than those that don't, planetary scientists have found.Depending on the techniques used for these measurements, sub-Neptunes seem to split into two distinct categories:"puffy" and"non-puffy.
The team behind this new research has proposed a few possible explanations for the lightness of resonant sub-Neptunes; the most probably appears to suggest the process is linked to how these wereIt's possible, the team says, that all planetary systems converge toward a resonant chain during their early existence. However, they believe only 5% of systems can maintain this rhythm.and often merging to become denser conglomerate worlds.
"The TTV method involves measuring variations in transit timing. Gravitational interactions between planets in the same system will slightly modify the moment the planets pass in front of their star," team member Jean-Baptiste Delisle, of the Astronomy Department of the UNIGE Faculty of Science, said in the statement."The radial velocity method, on the other hand, involves measuring the variations in the star’s velocity induced by the presence of the planet around it.
Performing a statistical analysis, the team found that the radial velocity method requires more time to detect large and low-mass planets, such as puffy sub-Neptunes. That means observations using radial velocity are more at risk of being interrupted before a planet's mass is estimated. This results in a bias in favor of higher masses and densities for planets characterized by the radial velocity method, with less dense planets being excluded.
France Dernières Nouvelles, France Actualités
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