CHEOPS precision phase curve of the Super-Earth 55 Cancri e
Artikel i vetenskaplig tidskrift, 2021

Context. 55 Cnc e is a transiting super-Earth (radius 1.88 R-circle plus and mass 8 M-circle plus) orbiting a G8V host star on a 17-h orbit. Spitzer observations of the planet's phase curve at 4.5 mu m revealed a time-varying occultation depth, and MOST optical observations are consistent with a time-varying phase curve amplitude and phase offset of maximum light. Both broadband and high-resolution spectroscopic analyses are consistent with either a high mean molecular weight atmosphere or no atmosphere for planet e. A long-term photometric monitoring campaign on an independent optical telescope is needed to probe the variability in this system. Aims. We seek to measure the phase variations of 55 Cnc e with a broadband optical filter with the 30 cm effective aperture space telescope CHEOPS and explore how the precision photometry narrows down the range of possible scenarios. Methods. We observed 55 Cnc for 1.6 orbital phases in March of 2020. We designed a phase curve detrending toolkit for CHEOPS photometry which allowed us to study the underlying flux variations in the 55 Cnc system. Results. We detected a phase variation with a full-amplitude of 72 +/- 7 ppm, but did not detect a significant secondary eclipse of the planet. The shape of the phase variation resembles that of a piecewise-Lambertian; however, the non-detection of the planetary secondary eclipse, and the large amplitude of the variations exclude reflection from the planetary surface as a possible origin of the observed phase variations. They are also likely incompatible with magnetospheric interactions between the star and planet, but may imply that circumplanetary or circumstellar material modulate the flux of the system. Conclusions. This year, further precision photometry of 55 Cnc from CHEOPS will measure variations in the phase curve amplitude and shape over time.

methods: observational

instrumentation: photometers

planets and satellites: atmospheres

planets and satellites: individual: 55 Cnc e

techniques: photometric

stars: individual: 55 Cnc

Författare

B. M. Morris

Universität Bern

L. Delrez

Universite de Liège

Université de Genève

A. Brandeker

Stockholms universitet

A. C. Cameron

University of St Andrews

A. E. Simon

Universität Bern

D. Futyan

Université de Genève

G. Olofsson

Stockholms universitet

S. Hoyer

Aix-Marseille Université

A. Fortier

Universität Bern

B-O Demory

Universität Bern

M. Lendl

Université de Genève

T. G. Wilson

University of St Andrews

M. Oshagh

Universidad de la Laguna

Instituto de Astrofísica de Canarias

K. Heng

Universität Bern

D. Ehrenreich

Université de Genève

S. Sulis

Aix-Marseille Université

Y. Alibert

Universität Bern

R. Alonso

Instituto de Astrofísica de Canarias

Universidad de la Laguna

G. Anglada Escude

Consejo Superior de Investigaciones Científicas (CSIC)

Institut d'Estudis Espacials de Catalunya (IEEC)

D. Barrado

Centro de Astrobiología (INTA-CSIC)

S. C. C. Barros

Universidade do Porto

W. Baumjohann

Österreichische Akademie der Wissenschaften

M. Beck

Université de Genève

T. Beck

Universität Bern

A. Bekkelien

Université de Genève

W. Benz

Universität Bern

M. Bergomi

Osservatorio Astronomico di Padova

N. Billot

Université de Genève

X. Bonfils

Université Grenoble Alpes

V Bourrier

Université de Genève

C. Broeg

Universität Bern

T. Barczy

Admatis

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. Charnoz

Université Paris Descartes

M. B. Davies

Lunds universitet

D. De Miguel Ferreras

Airbus Group

M. Deleuil

Aix-Marseille Université

A. Deline

Université de Genève

O. D. S. Demangeon

Universidade do Porto

A. Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

H. G. Floren

Stockholms universitet

L. Fossati

Österreichische Akademie der Wissenschaften

Malcolm Fridlund

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Universiteit Leiden

D. Gandolfi

Universita degli Studi di Torino

A. Garcia Munoz

Technische Universität Berlin

M. Gillon

Universite de Liège

M. Guedel

Universität Wien

P. Guterman

Institut National des Sciences de l'Univers

Aix-Marseille Université

K. Isaak

European Space Research and Technology Centre (ESA ESTEC)

L. Kiss

The University of Sydney

Eötvös Loránd University (ELTE)

Magyar Tudomanyos Akademia

J. Laskar

Université de recherche Paris Sciences et Lettres

A. Lecavelier des Etangs

Université Pierre et Marie Curie (UPMC)

M. Lieder

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

C. Lovis

Université de Genève

D. Magrin

Osservatorio Astronomico di Padova

P. F. L. Maxted

Keele University

V Nascimbeni

Osservatorio Astronomico di Padova

R. Ottensamer

Universität Wien

I Pagano

Osservatorio Astrofisico di Catania

E. Palle

Universidad de la Laguna

Instituto de Astrofísica de Canarias

G. Peter

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

G. Piotto

Osservatorio Astronomico di Padova

Università di Padova

A. Pizarro Rubio

Airbus Group

D. Pollacco

The University of Warwick

F. J. Pozuelos

Universite de Liège

D. Queloz

University of Cambridge

Université de Genève

R. Ragazzoni

Osservatorio Astronomico di Padova

Università di Padova

N. Rando

Europeiska rymdorganisationen (ESA)

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Technische Universität Berlin

Freie Universität Berlin

I Ribas

Consejo Superior de Investigaciones Científicas (CSIC)

Institut d'Estudis Espacials de Catalunya (IEEC)

N. C. Santos

Universidade do Porto

G. Scandariato

Osservatorio Astrofisico di Catania

A. M. S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. G. Sousa

Universidade do Porto

M. Steller

Österreichische Akademie der Wissenschaften

Gy M. Szabo

Eötvös Loránd University (ELTE)

D. Segransan

Université de Genève

N. Thomas

Universität Bern

S. Udry

Université de Genève

B. Ulmer

Ingenieurbüro Ulmer

V. Van Grootel

Universite de Liège

N. A. Walton

University of Cambridge

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 653 A173

Ämneskategorier

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Annan fysik

DOI

10.1051/0004-6361/202140892

Mer information

Senast uppdaterat

2023-01-02