Astrophysicists at the University of Texas at Arlington have predicted that an Earth-like planet may be lurking in a star system just 16 light years away.
The team investigated the star system Gliese 832 for additional exoplanets residing between the two currently known alien worlds in this system. Their computations revealed that an additional Earth-like planet with a dynamically stable configuration may be residing at a distance ranging from 0.25 to 2.0 astronomical unit (AU) from the star.
“According to our calculations, this hypothetical alien world would probably have a mass between 1 to 15 Earth’s masses,” said the lead author Suman Satyal, UTA physics researcher, lecturer and laboratory supervisor. The paper is co-authored by John Griffith, UTA undergraduate student and long-time UTA physics professor Zdzislaw Musielak.
The astrophysicists published their findings this week as “Dynamics of a probable Earth-Like Planet in the GJ 832 System” in The Astrophysical Journal.
Gliese 832b and Gliese 832c were learned by the radial velocity technique, which detects variations in the speed of the central star, due to the changing direction of the gravitational pull from an unseen exoplanet as it orbits the star. By simply regularly looking at the spectrum of a superstar – and so, calculating its velocity – one can see if it moves periodically due to the influence of a companion.
“We also used the integrated data from the time evolution of orbital parameters to make the synthetic radial speed curves of the known and the Earth-like exoplanets in the system, inch said Satyal, who received his Ph. D. in Astrophysics from UTA in 2014. “We obtained several radial velocity curves for varying masses and ranges indicating any new midsection planet, ” the astrophysicist noted.
As an example, if the new planet is located around 1 AU from the star, it includes an upper mass limit of 10 Earth masses and a made radial acceleration signal of 1. 4 meters per second. A planet with about the mass of the Soil perfectly location would have radial velocity signal of only 0. 14 m/s, thus smaller and hard to find with the current technology.
“The lifestyle of this possible world is supported by long lasting orbital stability of the system, orbital dynamics and the synthetic radial acceleration signal analysis”, Satyal said. “At the same time frame, a significantly large number of radial speed observations, transit method studies, as well as immediate imaging are still required to confirm the occurrence of possible new planets in the Gliese 832 system. inches
Read more at: https://phys.org/news/2017-08-astrophysicists-earth-like-planet-star-years.html#jCp