Newly discovered exoplanet dethrones former king of Kepler-88 planetary system

Newly discovered exoplanet dethrones former king of Kepler-88 planetary system
An artist's illustration of the Kepler-88 planetary system. Credit: W. M. KECK OBSERVATORY/ADAM MAKARENKO

Our solar system has a king. The planet Jupiter, named for the most powerful god in the Greek pantheon, has bossed around the other planets through its gravitational influence. With twice the mass of Saturn, and 300 times that of Earth, Jupiter's slightest movement is felt by all the other planets. Jupiter is thought to be responsible for the small size of Mars, the presence of the asteroid belt, and a cascade of comets that delivered water to young Earth.

Do other planetary systems have gravitational gods like Jupiter?

A team of astronomers led by the University of Hawaii Institute for Astronomy (UH IfA) has discovered a planet three times the mass of Jupiter in a distant planetary system.

The discovery is based on six years of data taken at W. M. Keck Observatory on Maunakea in Hawaii. Using the High-Resolution Echelle Spectrometer (HIRES) instrument on the 10-meter Keck I telescope, the team confirmed that the planet, named Kepler-88 d, orbits its star every four years, and its orbit is not circular, but elliptical. At three times the mass of Jupiter, Kepler-88 d is the most massive planet in this system.

The system, Kepler-88, was already famous among astronomers for two planets that orbit much closer to the star, Kepler-88 b and c (planets are typically named alphabetically in the order of their discovery).

Those two planets have a bizarre and striking dynamic called mean motion resonance. The sub-Neptune sized planet b orbits the star in just 11 days, which is almost exactly half the 22-day orbital period of planet c, a Jupiter-mass planet. The clockwork-like nature of their orbits is energetically efficient, like a parent pushing a child on a swing. Every two laps planet b makes around the star, it gets pumped. The outer planet, Kepler-88 c, is twenty times more massive than planet b, and so its force results in dramatic changes in the orbital timing of the inner planet.

Kepler-88 d has three times the mass of Kepler-88 c, making the newly found planet the most massive one known in this system. Credit: W. M. Keck Observatory/Adam Makarenko

Astronomers observed these changes, called transit timing variations, with the NASA Kepler space telescope, which detected the precise times when Kepler-88 b crossed (or transited) between the star and the telescope. Although transit timing variations (TTVs for short) have been detected in a few dozen planetary systems, Kepler-88 b has some of the largest timing variations. With transits arriving up to half a day early or late, the system is known as "the King of TTVs."

The newly discovered planet adds another dimension to astronomers' understanding of the system.

"At three times the mass of Jupiter, Kepler-88 d has likely been even more influential in the history of the Kepler-88 system than the so-called King, Kepler-88 c, which is only one Jupiter mass," says Dr. Lauren Weiss, Beatrice Watson Parrent Postdoctoral Fellow at UH IfA and lead author on the discovery team. "So maybe Kepler-88 d is the new supreme monarch of this planetary empire—the empress."

Perhaps these extrasolar sovereign leaders have had as much influence as Jupiter did for our . Such planets might have promoted the development of rocky planets and directed water-bearing comets toward them. Dr. Weiss and colleagues are searching for similar royal planets in other with small .

Their paper announcing the discovery of Kepler-88 d is published in the April 29th issue of the Astronomical Journal.


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More information: Lauren M. Weiss et al, The Discovery of the Long-Period, Eccentric Planet Kepler-88 d and System Characterization with Radial Velocities and Photodynamical Analysis, The Astronomical Journal (2020). DOI: 10.3847/1538-3881/ab88ca
Journal information: Astronomical Journal

Citation: Newly discovered exoplanet dethrones former king of Kepler-88 planetary system (2020, April 29) retrieved 27 May 2020 from https://phys.org/news/2020-04-newly-exoplanet-dethrones-king-kepler-.html
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