Study reveals that giant planets could reach "maturity" much earlier than previously thought

Artist's impression of the planetary system V1298 Tau. Crédito: Gabriel Pérez Díaz, SMM (IAC)

An international team of scientists, in which researchers from the Instituto de Astrofísica de Canarias (IAC) participate together with other institutions from Spain, Italy, Germany, Belgium, UK, and Mexico, has been able to measure the masses of the giant planets of the V1298 Tau system, just 20 million year old. Masses for such young giant planets had not been obtained previously, and this is the first evidence that these objects have already reached their final size at very early stages of their evolution. For this study they have used radial velocity measurements from the HARPS-N spectrographs, at the Roque de los Muchachos Observatory (ORM), and CARMENES, at the Calar Alto Observatory. The results are published today in the journal Nature Astronomy.

The study, led by the IAC researcher Alejandro Suárez Mascareño,  reports the measurement of the masses of two giant planets that orbit the young solar-type star V1298 Tau. They were discovered in 2019 by a team lead by Trevor David (JPL) using data from NASA's Kepler space telescope, which allowed the measurement of their sizes, slightly smaller than Jupiter, and of their orbital periods, 24 and 40 days for V1298 Tau b and e, respectively. 

"The characterization of very young planets is extraordinarily difficult," says Alejandro Suárez Mascareño, first author of the publication. The parent stars have very high levels of activity and until very recently it was unthinkable to even try ”. And he adds: “Only thanks to the combination of detections made with space telescopes, combined with intense radial velocity campaigns from Earth-based observatories and the use of the most advanced analysis techniques, it was possible to begin to see what is happening in such early stages of the evolution of planetary systems ”.In fact, for the new measurements of the planetary masses, it was necessary to separate the signals generated by these planets from the signal generated by the star's activity, almost ten times larger.

The study shows that the masses and radii of the planets V1298 Tau b and c are surprisingly similar to those of the giant planets of the Solar System or in other old extra-solar systems. These measurements, which are the first to be obtained of such young giant planets, allow us to test current ideas about the formation of planetary systems. “For many years, theoretical models have indicated that giant planets begin their evolution as bodies with a larger size, and later they contract over hundreds millions or even billions of years '', explains Víctor J. Sánchez Béjar, researcher at the IAC and co-author of the work. "We now know that they can actually reach a size similar to that of the planets in the Solar System in a very short time," he notes.

V1298 Tau
Comparison of the expected and observed contraction time for the planets in the V1298 Tau system. Credit: Gabriel Pérez Díaz, SMM  

The study of young systems gives researchers clues about what happened during the infancy of our solar system. “We still do not know if V1298 Tau is a normal case and its evolution is similar to that of most planets or if we are facing an exceptional case; if this were the normal scenario, it would mean that the evolution of planets like Jupiter and Saturn could have been very different from what we think ”, comments Nicolas Lodieu, a researcher at the IAC and also a co-author of the work. The results of this work thus help to build a more solid idea of ​​the early evolution of planetary systems like ours.

To achieve the measurement of these masses, the study has required a significant observational effort and the collaboration of multiple observatories and institutions from different countries. It has been necessary to combine radial velocity measurements from various instruments such as the high-resolution HARPS-N ultrastable spectrograph, installed at the Roque de los Muchachos Observatory's Telescopio Nazionale Galileo (TNG); the CARMENES high resolution spectrograph, installed at the Calar Alto observatory; the HERMES spectrograph, installed on the Mercator telescope, also at the ORM; and the SES spectrograph, installed in the STELLA telescope at the Teide Observatory. Observations taken from the Las Cumbres Observatory, a network of telescopes located around the world, have been used to continuously monitor the variations of the star's activity.

In addition to the researchers Alejandro Suárez Mascareño, Victor J. Sánchez Béjar and Nicolas Lodieu, from the IAC researchers Rafael Rebolo López, Felipe Murgas, Jonay González Hernández, Carlos Cardona Guillén, Borja Toledo Padrón, Patricia Chinchilla, Emma Esparza Borges, Mahmoud Oshagh, Enric Pallé and Hannu Parviainen. 

Article: Suarez Mascareño, A. et al.: "Rapid contraction of giant planets orbiting the 20 million-years old star V1298 Tau", Nature Astronomy, Nov. 2021. DOI: 10.1038/s41550-021-01533-7

Contact at the IAC:

Alejandro Suárez Mascareño, alejandro.suarez.mascareno [at]
Víctor J. Sánchez Béjar, vbejar [at]
Nicolas Lodieu, nlodieu [at]

Related projects
Helio and Asteroseismology
Helio and Astero-Seismology and Exoplanets Search

The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary

Projects' name image
Exoplanets and Astrobiology

The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable

Pallé Bago
Diseño 3D del instrumento en su ubicación
HARPS3 (High Accuracy Radial velocity Planet Searcher)

HARPS3 (High Accuracy Radial velocity Planet Searcher) is a new version of the succesful HARPS instrument. HARPS3 is an Echelle spectrograph with high resolution (R ̴ 115000) and a wavelength range of 380-690 nm. It will be installed in the Isaac Newton Telescope (upgraded and robotized) at the ORM.

Jonay Isai
González Hernández
Related news
Artist’s impression of the star GJ 3512, a red dwarf of approximately one tenth of the mass of the Sun, on which the newly discovered exoplanet GJ 3512b, a gas giant of high mass, orbits an unusual planet in this type of planetary systems.

Surveys have shown that super-Earth and Neptune-mass exoplanets are more frequent than gas giants around low-mass stars, as predicted by the core accretion theory of planet formation. We report the discovery of a giant planet around the very-low-mass star GJ 3512, as determined by optical and near-infrared radial-velocity observations. The planet has a minimum mass of 0.46 Jupiter masses, very high for such a small host star, and an eccentric 204-day orbit. Dynamical models show that the high eccentricity is most likely due to planet-planet interactions. We use simulations to demonstrate

Advertised on
GTC (panel a) and Spitzer (panel b) transit observation of the planet candidate WD 1856b.  The lack of difference in the transit depth in the optical and infrared helps to put constraints in the mass of the transiting object.

Astronomers have discovered thousands of planets outside the Solar System, most of which orbit stars that will eventually evolve into red giants and then into white dwarfs. During the red giant phase, any close-orbiting planets will be engulfed by the star, but more distant planets can survive this phase and remain in orbit around the white dwarf. Some white dwarfs show evidence for rocky material floating in their atmospheres, in warm debris disks or orbiting very closely, which has been interpreted as the debris of rocky planets that were scattered inwards and tidally disrupted. Recently

Advertised on