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

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, w...

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Autores principales: Cabrera, J., Barros, S.C.C., Armstrong, D., Hidalgo, D., Santos, N.C., Almenara, J.M., Alonso, R., Deleuil, M., Demangeon, O., Díaz, R.F., Lendl, M., Pfaff, J., Rauer, H., Santerne, A., Serrano, L.M., Zucker, S.
Formato: JOUR
Materias:
Eclipses
Methods: data analysis
Planets and satellites: detection
Techniques: photometric
Bins
Photometry
Planets
Satellites
Eclipsing binaries
High resolution image
Methods:data analysis
Planetary atmosphere
Planets and satellites: detections
Validation process
Orbits
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v606_n_p_Cabrera
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046361_v606_n_p_Cabrera
record_format dspace
spelling todo:paper_00046361_v606_n_p_Cabrera2023-10-03T14:01:15Z Disproving the validated planets K2-78b, K2-82b, and K2-92b: The importance of independently confirming planetary candidates Cabrera, J. Barros, S.C.C. Armstrong, D. Hidalgo, D. Santos, N.C. Almenara, J.M. Alonso, R. Deleuil, M. Demangeon, O. Díaz, R.F. Lendl, M. Pfaff, J. Rauer, H. Santerne, A. Serrano, L.M. Zucker, S. Eclipses Methods: data analysis Planets and satellites: detection Techniques: photometric Bins Photometry Planets Satellites Eclipses Eclipsing binaries High resolution image Methods:data analysis Planetary atmosphere Planets and satellites: detections Techniques: photometric Validation process Orbits 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. © ESO, 2017. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v606_n_p_Cabrera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Eclipses
Methods: data analysis
Planets and satellites: detection
Techniques: photometric
Bins
Photometry
Planets
Satellites
Eclipses
Eclipsing binaries
High resolution image
Methods:data analysis
Planetary atmosphere
Planets and satellites: detections
Techniques: photometric
Validation process
Orbits
spellingShingle Eclipses
Methods: data analysis
Planets and satellites: detection
Techniques: photometric
Bins
Photometry
Planets
Satellites
Eclipses
Eclipsing binaries
High resolution image
Methods:data analysis
Planetary atmosphere
Planets and satellites: detections
Techniques: photometric
Validation process
Orbits
Cabrera, J.
Barros, S.C.C.
Armstrong, D.
Hidalgo, D.
Santos, N.C.
Almenara, J.M.
Alonso, R.
Deleuil, M.
Demangeon, O.
Díaz, R.F.
Lendl, M.
Pfaff, J.
Rauer, H.
Santerne, A.
Serrano, L.M.
Zucker, S.
Disproving the validated planets K2-78b, K2-82b, and K2-92b: The importance of independently confirming planetary candidates
topic_facet Eclipses
Methods: data analysis
Planets and satellites: detection
Techniques: photometric
Bins
Photometry
Planets
Satellites
Eclipses
Eclipsing binaries
High resolution image
Methods:data analysis
Planetary atmosphere
Planets and satellites: detections
Techniques: photometric
Validation process
Orbits
description 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. © ESO, 2017.
format JOUR
author Cabrera, J.
Barros, S.C.C.
Armstrong, D.
Hidalgo, D.
Santos, N.C.
Almenara, J.M.
Alonso, R.
Deleuil, M.
Demangeon, O.
Díaz, R.F.
Lendl, M.
Pfaff, J.
Rauer, H.
Santerne, A.
Serrano, L.M.
Zucker, S.
author_facet Cabrera, J.
Barros, S.C.C.
Armstrong, D.
Hidalgo, D.
Santos, N.C.
Almenara, J.M.
Alonso, R.
Deleuil, M.
Demangeon, O.
Díaz, R.F.
Lendl, M.
Pfaff, J.
Rauer, H.
Santerne, A.
Serrano, L.M.
Zucker, S.
author_sort Cabrera, J.
title Disproving the validated planets K2-78b, K2-82b, and K2-92b: The importance of independently confirming planetary candidates
title_short Disproving the validated planets K2-78b, K2-82b, and K2-92b: The importance of independently confirming planetary candidates
title_full Disproving the validated planets K2-78b, K2-82b, and K2-92b: The importance of independently confirming planetary candidates
title_fullStr Disproving the validated planets K2-78b, K2-82b, and K2-92b: The importance of independently confirming planetary candidates
title_full_unstemmed Disproving the validated planets K2-78b, K2-82b, and K2-92b: The importance of independently confirming planetary candidates
title_sort disproving the validated planets k2-78b, k2-82b, and k2-92b: the importance of independently confirming planetary candidates
url http://hdl.handle.net/20.500.12110/paper_00046361_v606_n_p_Cabrera
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