2017A&A...606A..75C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:34:33

2017A&A...606A..75C - Astronomy and Astrophysics, volume 606A, 75-75 (2017/10-1)

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., DIAZ R.F., LENDL M., PFAFF J., RAUER H., SANTERNE A., SERRANO L.M. and ZUCKER S.

Abstract (from CDS):

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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): methods: data analysis - techniques: photometric - eclipses - planets and satellites: detection - planets and satellites: detection

CDS comments: Caption and text : EPIC 211152354 seems to be a misprint for EPIC 211152484, EPIC 210400868 for EPIC 210400751.

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 K2-78 * 03 48 54.0718595295 +13 29 00.723170374   13.09 12.19 11.99   ~ 3 0
2 K2-78b Pl 03 48 54.0718595295 +13 29 00.723170374           ~ 4 0
3 HD 24465 EB* 03 54 03.3709103068 +15 08 30.188297589   9.48 8.97     F8 8 1
4 K2-82 * 03 54 03.5707454239 +15 08 13.680914298   14.93 14.01 13.73   ~ 3 0
5 K2-82b Pl 03 54 03.5707454239 +15 08 13.680914298           ~ 4 0
6 K2-92 * 04 00 16.7760054594 +25 28 47.988270645           ~ 3 0
7 K2-92b Pl 04 00 16.7760054594 +25 28 47.988270645           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:34:33

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