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Transiting planet candidate from K2 with the longest period

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Giles_2018_Candidate_K2_A_A_L13.pdf (816.2Kb)
Date
20/07/2018
Author
Giles, H. A. C.
Osborn, H. P.
Blanco-Cuaresma, S.
Lovis, C.
Bayliss, D.
Eggenberger, P.
Cameron, A. Collier
Kristiansen, M. H.
Turner, O.
Bouchy, F.
Udry, S.
Keywords
Planets and satellites: detection
Stars: individual: EPIC248847494
Planetary systems
Techniques: photometric
Techniques: radial velocities
Techniques: spectroscopic
QB Astronomy
QC Physics
3rd-DAS
Metadata
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Abstract
Context. We present the transit and follow-up of a single transit event from Campaign 14 of K2, EPIC248847494b, which has a duration of 54 h and a 0.18% depth. Aims. Using photometric tools and conducting radial velocity follow-up, we vet and characterise this very strong candidate. Methods. Owing to the long, unknown period, standard follow-up methods needed to be adapted. The transit was fitted using Namaste, and the radial velocity slope was measured and compared to a grid of planet-like orbits with varying masses and periods. These used stellar parameters measured from spectra and the distance as measured by Gaia. Results. Orbiting around a sub-giant star with a radius of 2.70 ± 0.12 RSol, the planet has a radius of 1.11−0.07+0.07 RJup and a period of 3650−1130+1280 days. The radial velocity measurements constrain the mass to be lower than 13 MJup, which implies a planet-like object. Conclusions. We have found a planet at 4.5 AU from a single-transit event. After a full radial velocity follow-up campaign, if confirmed, it will be the longest-period transiting planet discovered.
Citation
Giles , H A C , Osborn , H P , Blanco-Cuaresma , S , Lovis , C , Bayliss , D , Eggenberger , P , Cameron , A C , Kristiansen , M H , Turner , O , Bouchy , F & Udry , S 2018 , ' Transiting planet candidate from K2 with the longest period ' , Astronomy & Astrophysics , vol. 615 , L13 . https://doi.org/10.1051/0004-6361/201833569
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201833569
ISSN
0004-6361
Type
Journal article
Rights
© 2018, ESO. This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1051/0004-6361/201833569.
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  • University of St Andrews Research
URL
https://arxiv.org/abs/1806.08757
URI
http://hdl.handle.net/10023/15795

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