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Title: | Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS | Authors: | 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. |
Issue Date: | 2021 | Journal: | NATURE ASTRONOMY | Number: | 5 | Issue: | 8 | First Page: | 775 | Abstract: | 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. ν<SUP>2</SUP> 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 monitoring<SUP>1</SUP>. The two inner planets (b and c) were recently found to transit<SUP>2</SUP>, 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<SUB>⊕</SUB> and 8.82 ± 0.94 M<SUB>⊕</SUB>, respectively. With its bright Sun-like star, long period and mild irradiation (~5.7 times the irradiation of Earth), ν<SUP>2</SUP> 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 ν<SUP>2</SUP> Lupi system an excellent laboratory for testing formation and evolution models of low-mass planets.... | URI: | http://hdl.handle.net/20.500.12386/34900 | URL: | https://www.nature.com/articles/s41550-021-01381-5 http://www.scopus.com/inward/record.url?eid=2-s2.0-85112680863&partnerID=MN8TOARS |
ISSN: | 2397-3366 | DOI: | 10.1038/s41550-021-01381-5 | Bibcode ADS: | 2021NatAs...5..775D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
delrez.pdf | preprint | 7.74 MB | Adobe PDF | View/Open |
s41550-021-01381-5 compr_1.pdf | [Administrators only] part 1 | 10.24 MB | Adobe PDF | |
s41550-021-01381-5 compr_2.pdf | [Administrators only] Part 2 | 1.06 MB | Adobe PDF |
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