The planetary system around HD 190622 (TOI-1054)

Cabrera, J.; Gandolfi, D.; Serrano, L. M.; Csizmadia, Sz.; Egger, J. A.; Baumeister, Ph.; Krenn, A.; Benz, W.; Deline, A.; Florén, H.-G.; Collier Cameron, A.; Adibekyan, V.; Alibert, Y.; Bellomo, S. E.; Delrez, L.; Fossati, L.; Fortier, A.; Grziwa, S.; Hoyer, S.; Bonfanti, A.; ... (2023). The planetary system around HD 190622 (TOI-1054). Astronomy and astrophysics, 675, A183. EDP Sciences 10.1051/0004-6361/202245774

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Context. Giant planets are known to dominate the long-term stability of planetary systems due to their prevailing gravitational interactions, but they are also thought to play an important role in planet formation. Observational constraints improve our understanding of planetary formation processes such as the delivery of volatile-rich planetesimals from beyond the ice line into the inner planetary system. Additional constraints may come from studies of the atmosphere, but almost all such studies of the atmosphere investigate the detection of certain species, and abundances are not routinely quantitatively measured.

Aims. Accurate measurements of planetary bulk parameters – that is, mass and density – provide constraints on the inner structure and chemical composition of transiting planets. This information provides insight into properties such as the amounts of volatile species, which in turn can be related to formation and evolution processes.

Methods. The Transiting Exoplanet Survey Satellite (TESS) reported a planetary candidate around HD 190622 (TOI-1054), which was subsequently validated and found to merit further characterization with photometric and spectroscopic facilities. The KESPRINT collaboration used data from the High Accuracy Radial Velocity Planet Searcher (HARPS) to independently confirm the planetary candidate, securing its mass, and revealing the presence of an outer giant planet in the system. The CHEOPS consortium invested telescope time in the transiting target in order to reduce the uncertainty on the radius, improving the characterization of the planet.

Results. We present the discovery and characterization of the planetary system around HD 190622 (TOI-1054). This system hosts one transiting planet, which is smaller than Neptune (3.087-0.053+0.058REarth, 7.7 ± 1.0 MEarth) but has a similar bulk density (1.43 ± 0.21 g cm−3) and an orbital period of 16 days; and a giant planet, not known to be transiting, with a minimum mass of 227.0 ± 6.7 MEarth in an orbit with a period of 315 days.

Conclusions. Our measurements constrain the structure and composition of the transiting planet. HD 190622b has singular properties among the known population of transiting planets, which we discuss in detail. Among the sub-Neptune-sized planets known today, this planet stands out because of its large gas content.

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
10 Strategic Research Centers > Center for Space and Habitability (CSH)
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Egger, Jo Ann, Benz, Willy, Alibert, Yann Daniel Pierre, Fortier, A., Broeg, Christopher, Demory, Brice-Olivier Denys, Osborn, Hugh Patrick, Simon, Attila, Thomas, Nicolas


500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics
500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health




EDP Sciences




Danielle Zemp

Date Deposited:

15 Apr 2024 11:42

Last Modified:

15 Apr 2024 11:51

Publisher DOI:





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