Unprecedented Ground-Based Discovery of Unusual Planetary System, WASP-148

WASP Exoplanets

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Artistic view of the highly connecting exoplanetary system WASP-148. The world WASP-148c is displayed in front. On the back, one can see the world WASP-148b transiting the host star around which the 2 worlds remain in orbit. Credit: Institut d’astrophysique de Paris, Mark A. Garlick

Several connecting exoplanets have actually currently been identified by satellites. But a brand-new advancement has actually been attained with, for the very first time, the detection straight from the ground of an extrasolar system of this type. An global cooperation consisting of CNRS scientists[1] has actually found an uncommon planetary system, called WASP-148, utilizing the French instrument SOPHIE at the Observatoire de Haute-Provence (CNRS/Aix-Marseille Université;).

The researchers examined the star’s movement and concluded that it hosted 2 worlds, WASP-148b and WASP-148c. The observations revealed that the 2 worlds were highly connecting, which was verified from other information[2].

SOPHIE Spectroscope

Observatoire de Haute-Provence. The SOPHIE spectroscope (installed on the 193 cm telescope in the background) added to the detection and characterization of the WASP-148 exoplanetary system. Credit: OSU Pytheas / CNRS / AMU

Whereas the very first world, WASP-148b, orbits its star in almost 9 days, the 2nd one, WASP-148c, takes 4 times longer. This ratio in between the orbital durations suggests that the WASP-148 system is close to resonance, suggesting that there is improved gravitational interaction in between the 2 worlds.

And it ends up that the astronomers did certainly find variations in the orbital durations of the worlds. While a single world, uninfluenced by a 2nd one, would move with a continuous duration, WASP-148b and WASP-148c go through velocity and deceleration that supplies proof of their interaction. Their research study will soon be released in the journal Astronomy & Astrophysics.

WASP 148 Measurements

Measurements (in red) of the radial speed of the WASP-148 planetary system with the SOPHIE spectroscope at the Observatoire de Haute-Provence. The information reveal variations in the star’s radial speed triggered by the worlds WASP-148b (left) and WASP-148c (right). The black curves reveal the theoretical design that finest fits the measurement points. Credit: G. Hébrard et al.

Reference: “Discovery and characterization of the exoplanets WASP-148b and c. A transiting system with two interacting giant planets” by G. Hebrard, R.F. Diaz, A.C.M. Correia, A. Collier Cameron, J. Laskar, D. Pollacco et al., Forthcoming post, Astronomy & Astrophysics.
DOI: 10.1051/0004-6361/202038296


  1. French researchers operate in the following labs : Institut d’astrophysique de Paris (CNRS/Sorbonne Université;) ; Observatoire de Haute-Provence (CNRS/Aix-Marseille Université;) ; Institut de mécanique céleste et de calcul des éphémérides (CNRS/Observatoire de Paris-PSL/Sorbonne Université;) ; Institut de planétologie et d’astrophysique de Grenoble (CNRS/Université; Grenoble Alpes) ; Laboratoire d’astrophysique de Marseille (CNRS/Aix-Marseille Université) ; Laboratoire d’études spatiales et d’instrumentation en astrophysique (CNRS/Observatoire de Paris-PSL/Sorbonne Université/Université; de Paris). They likewise colaborated with amateur astronomers from Hubert-Reeves Observatory.
  2. Mesures made with Hubert-Reeves telescope, France, and utilizing SuperWASP, INCREASE, Carlos Sanchez and Liverpool, Canary Islands, Spain.

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