Transit detection of the long-period volatile-rich super-Earth nu(2) Lupi d with CHEOPS
Artikel i vetenskaplig tidskrift, 2021
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. nu(2) 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(1). The two inner planets (b and c) were recently found to transit(2), 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-circle plus and 8.82 +/- 0.94 M-circle plus, respectively. With its bright Sun-like star, long period and mild irradiation (similar to 5.7 times the irradiation of Earth), nu(2) 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 nu(2) Lupi system an excellent laboratory for testing formation and evolution models of low-mass planets.
Författare
Laetitia Delrez
Université de Genève
Universite de Liège
David Ehrenreich
Université de Genève
Yann Alibert
Universität Bern
Andrea Bonfanti
Österreichische Akademie der Wissenschaften
Luca Borsato
Istituto nazionale di astrofisica (INAF)
Luca Fossati
Österreichische Akademie der Wissenschaften
Matthew J. Hooton
Universität Bern
Sergio Hoyer
Aix-Marseille Université
Francisco J. Pozuelos
Universite de Liège
Sebastien Salmon
Universite de Liège
Université de Genève
Institut de Physique du Globe de Paris
Sophia Sulis
Aix-Marseille Université
Thomas G. Wilson
University of St Andrews
Vardan Adibekyan
Universidade do Porto
Vincent Bourrier
Université de Genève
Alexis Brandeker
Stockholms universitet
Adrien Deline
Université de Genève
Pascal Guterman
Aix-Marseille Université
Institut National des Sciences de l'Univers
Jonas Haldemann
Universität Bern
Nathan Hara
Université de Genève
Mahmoudreza Oshagh
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Sergio G. Sousa
Universidade do Porto
Valerie Van Grootel
Universite de Liège
Roi Alonso
Universidad de la Laguna
Instituto de Astrofísica de Canarias
Guillem Anglada-Escude
Institut d'Estudis Espacials de Catalunya (IEEC)
Consejo Superior de Investigaciones Científicas (CSIC)
Tamas Barczy
Admatis
David Barrado
Centro de Astrobiología (INTA-CSIC)
Susana C. C. Barros
Universidade do Porto
Mathias Beck
Université de Genève
Anja Bekkelien
Université de Genève
Willy Benz
Universität Bern
Nicolas Billot
Université de Genève
Xavier Bonfils
Université Grenoble Alpes
Christopher Broeg
Universität Bern
Andrew Collier Cameron
University of St Andrews
Melvyn B. Davies
Lunds universitet
Magali Deleuil
Aix-Marseille Université
Jean-Baptiste Delisle
Université de Genève
Olivier D. S. Demangeon
Universidade do Porto
Brice-Olivier Demory
Universität Bern
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Andrea Fortier
Universität Bern
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
David Futyan
Université de Genève
Davide Gandolfi
Istituto nazionale di astrofisica (INAF)
Antonio Garcia Munoz
Technische Universität Berlin
Michael Gillon
Universite de Liège
Manuel Guedel
Universität Wien
Kevin Heng
Universität Bern
Laszlo Kiss
Eötvös Loránd University (ELTE)
Magyar Tudomanyos Akademia
The University of Sydney
Jacques Laskar
Université de recherche Paris Sciences et Lettres
Alain Lecavelier des Etangs
Sorbonne Université
Monika Lendl
Université de Genève
Christophe Lovis
Université de Genève
Pierre F. L. Maxted
Keele University
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
Hugh P. Osborn
Universität Bern
Massachusetts Institute of Technology (MIT)
Isabella Pagano
Istituto nazionale di astrofisica (INAF)
Enric Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
Giampaolo Piotto
Università di Padova
Istituto nazionale di astrofisica (INAF)
Don Pollacco
The University of Warwick
Didier Queloz
University of Cambridge
Université de Genève
Heike Rauer
Technische Universität Berlin
Freie Universität Berlin
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Roberto Ragazzoni
Istituto nazionale di astrofisica (INAF)
Ignasi Ribas
Consejo Superior de Investigaciones Científicas (CSIC)
Institut d'Estudis Espacials de Catalunya (IEEC)
Nuno C. Santos
Universidade do Porto
Gaetano Scandariato
Istituto nazionale di astrofisica (INAF)
Damien Segransan
Université de Genève
Attila E. Simon
Universität Bern
Alexis M. S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Manfred Steller
Österreichische Akademie der Wissenschaften
Gyula M. Szabo
Eötvös Loránd University (ELTE)
Nicolas Thomas
Universität Bern
Stephane Udry
Université de Genève
Nicholas A. Walton
University of Cambridge
Nature Astronomy
23973366 (eISSN)
Vol. 5 8 775-787Ämneskategorier
Astronomi, astrofysik och kosmologi
Annan geovetenskap och miljövetenskap
DOI
10.1038/s41550-021-01381-5