Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS

Delrez, Laetitia; Ehrenreich, David; Alibert, Yann; Bonfanti, Andrea; Borsato, Luca; Fossati, Luca; Hooton, Matthew J.; Hoyer, Sergio; Pozuelos, Francisco J.; Salmon, Sébastien; Sulis, Sophia; Wilson, Thomas G.; Adibekyan, Vardan; Bourrier, Vincent; Brandeker, Alexis; Charnoz, Sébastien; Deline, Adrien; Guterman, Pascal; Haldemann, Jonas; Hara, Nathan; ... (2021). Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS. Nature astronomy, 5(8), pp. 775-787. Nature Publishing Group 10.1038/s41550-021-01381-5

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Exoplanets transiting bright nearby stars are key objects for advancing our knowledge of planetary formation and evolution. The wealth of photons from the host star gives detailed access to the atmospheric, interior and orbital properties of the planetary companions. ν2 Lupi (HD 136352) is a naked-eye (V = 5.78) Sun-like star that was discovered to host three low-mass planets with orbital periods of 11.6, 27.6 and 107.6 d via radial-velocity monitoring1. The two inner planets (b and c) were recently found to transit2, prompting a photometric follow-up by the brand new Characterising Exoplanets Satellite (CHEOPS). Here, we report that the outer planet d is also transiting, and measure its radius and mass to be 2.56 ± 0.09 R⊕ and 8.82 ± 0.94 M ⊕, respectively. With its bright Sun-like star, long period and mild irradiation (~5.7 times the irradiation of Earth), ν2 Lupi d unlocks a completely new region in the parameter space of exoplanets amenable to detailed characterization. We refine the properties of all three planets: planet b probably has a rocky mostly dry composition, while planets c and d seem to have retained small hydrogen–helium envelopes and a possibly large water fraction. This diversity of planetary compositions makes the ν2 Lupi system an excellent laboratory for testing formation and evolution models of low-mass planets.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
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:

Alibert, Yann Daniel Pierre, Hooton, Matthew John, Haldemann, Jonas, Benz, Willy, Broeg, Christopher, Demory, Brice-Olivier Denys, Fortier, A., Heng, Kevin, Osborn, Hugh Patrick, Thomas, Nicolas

Subjects:

500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

2397-3366

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

10 Mar 2022 15:03

Last Modified:

27 Oct 2023 12:06

Publisher DOI:

10.1038/s41550-021-01381-5

BORIS DOI:

10.48350/165959

URI:

https://boris.unibe.ch/id/eprint/165959

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