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Disproving the validated planets K2-78b, K2-82b, and K2-92b The importance of independently confirming planetary candidates

Cabrera, J and Barros, S.C.C. and Armstrong, D. J. and Hidalgo, D. and Santos, N.C. and Almenara, J.-M. and Alonso, R and Deleuil, M. and Demangeon, O. and Diaz, R.F. and Lendl, M. and Pfaff, J. and Rauer, H. and Santerne, A and Serrano, L. M. and Zucker, S. (2017) Disproving the validated planets K2-78b, K2-82b, and K2-92b The importance of independently confirming planetary candidates. Astronomy and Astrophysics, 606, A75. EDP Sciences. DOI: 10.1051/0004-6361/201731233 ISSN 0004-6361

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Abstract

Context. Transiting super-Earths orbiting bright stars in short orbital periods are interesting targets for the study of planetary atmospheres. Aims. While selecting super-Earths suitable for further characterisation from the ground from a list of confirmed and validated exoplanets detected by K2, we found some suspicious cases that led to us reassess the nature of the detected transiting signal. Methods. We performed a photometric analysis of the K2 light curves and centroid motions of the photometric barycenters. Results. Our study shows that the validated planets K2-78b, K2-82b, and K2-92b are not planets, but background eclipsing binaries. The eclipsing binaries are inside the Kepler photometric aperture, but outside the ground-based high-resolution images that were used for validation. Conclusions. We advise extreme care in the validation of candidate planets that are discovered by space missions. It is important that all the assumptions in the validation process are carefully checked. An independent confirmation is mandatory in order to avoid wasting valuable resources on further characterisation of non-existent targets.

Item URL in elib:https://elib.dlr.de/116335/
Document Type:Article
Title:Disproving the validated planets K2-78b, K2-82b, and K2-92b The importance of independently confirming planetary candidates
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cabrera, Jjuan.cabrera (at) dlr.deUNSPECIFIED
Barros, S.C.C.instituto de astrofísica e ciências do espaço, universidade de porto, caup, rua das estrelas, 4150-762 porto, portugalUNSPECIFIED
Armstrong, D. J.university of warwick, department of physics, gibbet hill road, coventry, cv4 7al, ukUNSPECIFIED
Hidalgo, D.instituto de astrof´ısica de canarias, e-38205 la laguna, tenerife, spainUNSPECIFIED
Santos, N.C.instituto de astrofísica e ciências do espaço, universidade de porto, caup, rua das estrelas, 4150-762 porto, portugalUNSPECIFIED
Almenara, J.-M.observatoire de l’universit´e de gen`eve, 51 chemin des maillettes, 1290 sauverny, switzerlandUNSPECIFIED
Alonso, Rlaboratoire d'astrophysique de marseilleUNSPECIFIED
Deleuil, M.laboratoire d'astrophysique de marseilleUNSPECIFIED
Demangeon, O.instituto de astrofísica e ciências do espaço, universidade de porto, caup, rua das estrelas, 4150-762 porto, portugalUNSPECIFIED
Diaz, R.F.institut d’astrophysique de paris, université pierre & marie curie, paris, france; observatoire de haute-provence, saint-michel-l’observatoire, franceUNSPECIFIED
Lendl, M.space research institute, austrian academy of sciences, schmiedlstr. 6, 8042 graz, austriaUNSPECIFIED
Pfaff, J.instituto de astrofísica e ciências do espaço, universidade de porto, caup, rua das estrelas, 4150-762 porto, portugalUNSPECIFIED
Rauer, H.heike.rauer (at) dlr.deUNSPECIFIED
Santerne, Ainstituto de astrofísica e ciências do espaço, universidade doUNSPECIFIED
Serrano, L. M.instituto de astrofísica e ciências do espaço, universidade do porto, caup, rua das estrelas, 4150-762 porto, portugalUNSPECIFIED
Zucker, S.observatoire de genève, sauverny, switzerlandUNSPECIFIED
Date:2017
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:606
DOI :10.1051/0004-6361/201731233
Page Range:A75
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:methods: data analysis – techniques: photometric – eclipses – planets and satellites: detection
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Project PLATO
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Stiebeler, Ulrike
Deposited On:30 Nov 2017 14:10
Last Modified:08 Mar 2018 18:54

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