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

Institut de Physique du Globe de Paris

Universite de Liège

Université de Genève

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

INSU

Jonas Haldemann

Universität Bern

Nathan Hara

Université de Genève

Mahmoudreza Oshagh

Universidad de la Laguna

Instituto Astrofisico de Canarias

Sergio G. Sousa

Universidade do Porto

Valerie Van Grootel

Universite de Liège

Roi Alonso

Universidad de la Laguna

Instituto Astrofisico de Canarias

Guillem Anglada-Escude

Consejo Superior de Investigaciones Científicas (CSIC)

Institut d'Estudis Espacials de Catalunya (IEEC)

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

Ctr Space & Habitabil

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

Ctr Space & Habitabil

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

Ctr Space & Habitabil

Laszlo Kiss

Eötvös Loránd University (ELTE)

The University of Sydney

Magyar Tudomanyos Akademia

Jacques Laskar

Université de recherche Paris Sciences et Lettres

Alain Lecavelier des Etangs

Université Pierre et Marie Curie (UPMC)

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

Massachusetts Institute of Technology (MIT)

Universität Bern

Isabella Pagano

Istituto nazionale di astrofisica (INAF)

Enric Palle

Universidad de la Laguna

Instituto Astrofisico de Canarias

Giampaolo Piotto

Istituto nazionale di astrofisica (INAF)

Università di Padova

Don Pollacco

The University of Warwick

Didier Queloz

Université de Genève

University of Cambridge

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

MTA ELTE Exoplanet Res Grp

Eötvös Loránd University (ELTE)

Nicolas Thomas

Universität Bern

Stephane Udry

Université de Genève

Nicholas A. Walton

University of Cambridge

NATURE ASTRONOMY

2397-3366 (ISSN)

Vol. In Press

Ämneskategorier

Astronomi, astrofysik och kosmologi

Annan geovetenskap och miljövetenskap

DOI

10.1038/s41550-021-01381-5

Mer information

Senast uppdaterat

2021-08-16