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Journal Articles Nature Astronomy Year : 2021

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

Laetitia Delrez
Andrea Bonfanti
Luca Borsato
Matthew Hooton
Sergio Hoyer
Francisco Pozuelos
Sophia Sulis
Thomas Wilson
Vardan Adibekyan
Vincent Bourrier
Alexis Brandeker
Sébastien Charnoz
Adrien Deline
  • Function : Author
Pascal Guterman
  • Function : Author
Jonas Haldemann
Nathan Hara
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Mahmoudreza Oshagh
  • Function : Author
Sergio Sousa
Valérie van Grootel
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Roi Alonso
Guillem Anglada-Escudé
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Tamás Bárczy
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David Barrado
Susana Barros
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Wolfgang Baumjohann
Mathias Beck
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Anja Bekkelien
  • Function : Author
Willy Benz
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Nicolas Billot
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Christopher Broeg
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Juan Cabrera
Andrew Collier Cameron
Melvyn Davies
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Magali Deleuil
Jean-Baptiste Delisle
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Olivier Demangeon
Brice-Olivier Demory
Anders Erikson
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Andrea Fortier
Malcolm Fridlund
David Futyan
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Davide Gandolfi
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Antonio Garcia Muñoz
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Michaël Gillon
Manuel Guedel
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Kevin Heng
László Kiss
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Alain Lecavelier Des Etangs
  • Function : Author
Monika Lendl
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Christophe Lovis
Pierre Maxted
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Valerio Nascimbeni
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Göran Olofsson
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Hugh Osborn
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Isabella Pagano
Enric Pallé
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Giampaolo Piotto
Don Pollacco
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Didier Queloz
Heike Rauer
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Roberto Ragazzoni
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Ignasi Ribas
Nuno Santos
Gaetano Scandariato
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Damien Ségransan
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Attila Simon
  • Function : Author
Alexis Smith
Manfred Steller
  • Function : Author
Gyula Szabó
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Nicolas Thomas
Stéphane Udry
Nicholas Walton


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.

Dates and versions

insu-03458402 , version 1 (30-11-2021)



Laetitia Delrez, David Ehrenreich, Yann Alibert, Andrea Bonfanti, Luca Borsato, et al.. Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS. Nature Astronomy, 2021, 5, pp.775-787. ⟨10.1038/s41550-021-01381-5⟩. ⟨insu-03458402⟩
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