Transit detection of the long-period volatile-rich super-Earth nu(2) Lupi d with CHEOPS
Journal article, 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.

Author

Laetitia Delrez

University of Geneva

University of Liège

David Ehrenreich

University of Geneva

Yann Alibert

University of Bern

Andrea Bonfanti

Austrian Academy of Sciences

Luca Borsato

Istituto nazionale di astrofisica (INAF)

Luca Fossati

Austrian Academy of Sciences

Matthew J. Hooton

University of Bern

Sergio Hoyer

Aix Marseille University

Francisco J. Pozuelos

University of Liège

Sebastien Salmon

Institut de Physique du Globe de Paris

University of Liège

University of Geneva

Sophia Sulis

Aix Marseille University

Thomas G. Wilson

University of St Andrews

Vardan Adibekyan

University of Porto

Vincent Bourrier

University of Geneva

Alexis Brandeker

Stockholm University

Adrien Deline

University of Geneva

Pascal Guterman

Aix Marseille University

INSU

Jonas Haldemann

University of Bern

Nathan Hara

University of Geneva

Mahmoudreza Oshagh

University of La Laguna

Instituto de Astrofísica de Canarias

Sergio G. Sousa

University of Porto

Valerie Van Grootel

University of Liège

Roi Alonso

Instituto de Astrofísica de Canarias

University of La Laguna

Guillem Anglada-Escude

Institute of Space Studies of Catalonia (IEEC)

Spanish National Research Council (CSIC)

Tamas Barczy

Admatis

David Barrado

Spanish Astrobiology Center (INTA-CSIC)

Susana C. C. Barros

University of Porto

Mathias Beck

University of Geneva

Anja Bekkelien

University of Geneva

Willy Benz

University of Bern

Nicolas Billot

University of Geneva

Xavier Bonfils

Grenoble Alpes University

Christopher Broeg

University of Bern

Andrew Collier Cameron

University of St Andrews

Melvyn B. Davies

Lund University

Magali Deleuil

Aix Marseille University

Jean-Baptiste Delisle

University of Geneva

Olivier D. S. Demangeon

University of Porto

Brice-Olivier Demory

University of Bern

Anders Erikson

German Aerospace Center (DLR)

Andrea Fortier

University of Bern

Malcolm Fridlund

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

David Futyan

University of Geneva

Davide Gandolfi

Istituto nazionale di astrofisica (INAF)

Antonio Garcia Munoz

Technische Universität Berlin

Michael Gillon

University of Liège

Manuel Guedel

University of Vienna

Kevin Heng

University of Bern

Laszlo Kiss

Eötvös Loránd University (ELTE)

Hungarian Academy of Sciences

The University of Sydney

Jacques Laskar

Université Paris PSL

Alain Lecavelier des Etangs

Pierre and Marie Curie University (UPMC)

Monika Lendl

University of Geneva

Christophe Lovis

University of Geneva

Pierre F. L. Maxted

Keele University

Valerio Nascimbeni

Istituto nazionale di astrofisica (INAF)

Hugh P. Osborn

University of Bern

Massachusetts Institute of Technology (MIT)

Isabella Pagano

Istituto nazionale di astrofisica (INAF)

Enric Palle

Instituto de Astrofísica de Canarias

University of La Laguna

Giampaolo Piotto

Istituto nazionale di astrofisica (INAF)

University of Padua

Don Pollacco

The University of Warwick

Didier Queloz

University of Cambridge

University of Geneva

Heike Rauer

Technische Universität Berlin

German Aerospace Center (DLR)

Freie Universität Berlin

Roberto Ragazzoni

Istituto nazionale di astrofisica (INAF)

Ignasi Ribas

Spanish National Research Council (CSIC)

Institute of Space Studies of Catalonia (IEEC)

Nuno C. Santos

University of Porto

Gaetano Scandariato

Istituto nazionale di astrofisica (INAF)

Damien Segransan

University of Geneva

Attila E. Simon

University of Bern

Alexis M. S. Smith

German Aerospace Center (DLR)

Manfred Steller

Austrian Academy of Sciences

Gyula M. Szabo

Eötvös Loránd University (ELTE)

Nicolas Thomas

University of Bern

Stephane Udry

University of Geneva

Nicholas A. Walton

University of Cambridge

NATURE ASTRONOMY

2397-3366 (ISSN)

Vol. In Press

Subject Categories

Astronomy, Astrophysics and Cosmology

Other Earth and Related Environmental Sciences

DOI

10.1038/s41550-021-01381-5

More information

Latest update

10/14/2021