Bibcode
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; Oshagh, Mahmoudreza; Sousa, Sergio G.; Van Grootel, Valérie; Alonso, Roi; Anglada-Escudé, Guillem; Bárczy, Tamás; Barrado, David; Barros, Susana C. C.; Baumjohann, Wolfgang; Beck, Mathias; Bekkelien, Anja; Benz, Willy; Billot, Nicolas; Bonfils, Xavier; Broeg, Christopher; Cabrera, Juan; Collier Cameron, Andrew; Davies, Melvyn B.; Deleuil, Magali; Delisle, Jean-Baptiste; Demangeon, Olivier D. S.; Demory, Brice-Olivier; Erikson, Anders; Fortier, Andrea; Fridlund, Malcolm; Futyan, David; Gandolfi, Davide; Garcia Muñoz, Antonio; Gillon, Michaël; Guedel, Manuel; Heng, Kevin; Kiss, László; Laskar, Jacques; Lecavelier des Etangs, Alain; Lendl, Monika; Lovis, Christophe; Maxted, Pierre F. L.; Nascimbeni, Valerio; Olofsson, Göran; Osborn, Hugh P.; Pagano, Isabella; Pallé, Enric; Piotto, Giampaolo; Pollacco, Don; Queloz, Didier; Rauer, Heike; Ragazzoni, Roberto; Ribas, Ignasi; Santos, Nuno C.; Scandariato, Gaetano; Ségransan, Damien; Simon, Attila E.; Smith, Alexis M. S.; Steller, Manfred; Szabó, Gyula M.; Thomas, Nicolas; Udry, Stéphane; Walton, Nicholas A.
Bibliographical reference
Nature Astronomy
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6
2021
Citations
59
Refereed citations
55
Description
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.
Related projects
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
Enric
Pallé Bago