Transiting planet candidate from K2 with the longest period

H. A. C. Giles; H. P. Osborn; S. Blanco-Cuaresma; C. Lovis; D. Bayliss; P. Eggenberger; A. Collier Cameron; M. H. Kristiansen; O. Turner; F. Bouchy; S. Udry

doi:10.1051/0004-6361/201833569

Transiting planet candidate from K2 with the longest period

H. A. C. Giles, H. P. Osborn, S. Blanco-Cuaresma, C. Lovis, D. Bayliss, P. Eggenberger, A. Collier Cameron, M. H. Kristiansen, O. Turner, F. Bouchy, S. Udry

Research output: Contribution to journal › Article › peer-review

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 R_Sol, the planet has a radius of 1.11−0.07+0.07 R_Jup and a period of 3650₋₁₁₃₀⁺¹²⁸⁰ days. The radial velocity measurements constrain the mass to be lower than 13 M_Jup, 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.

Original language	English
Article number	L13
Number of pages	5
Journal	Astronomy & Astrophysics
Volume	615
DOIs	https://doi.org/10.1051/0004-6361/201833569
Publication status	Published - 20 Jul 2018

Keywords

Planets and satellites: detection
Stars: individual: EPIC248847494
Planetary systems
Techniques: photometric
Techniques: radial velocities
Techniques: spectroscopic

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10.1051/0004-6361/201833569

Giles-2018-Candidate-K2-A&A-L13
© 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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https://arxiv.org/abs/1806.08757

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title = "Transiting planet candidate from K2 with the longest period",

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.",

keywords = "Planets and satellites: detection, Stars: individual: EPIC248847494, Planetary systems, Techniques: photometric, Techniques: radial velocities, Techniques: spectroscopic",

author = "Giles, {H. A. C.} and Osborn, {H. P.} and S. Blanco-Cuaresma and C. Lovis and D. Bayliss and P. Eggenberger and Cameron, {A. Collier} and Kristiansen, {M. H.} and O. Turner and F. Bouchy and S. Udry",

year = "2018",

month = jul,

day = "20",

doi = "10.1051/0004-6361/201833569",

language = "English",

volume = "615",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

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TY - JOUR

T1 - Transiting planet candidate from K2 with the longest period

AU - Giles, H. A. C.

AU - Osborn, H. P.

AU - Blanco-Cuaresma, S.

AU - Lovis, C.

AU - Bayliss, D.

AU - Eggenberger, P.

AU - Cameron, A. Collier

AU - Kristiansen, M. H.

AU - Turner, O.

AU - Bouchy, F.

AU - Udry, S.

PY - 2018/7/20

Y1 - 2018/7/20

N2 - 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.

AB - 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.

KW - Planets and satellites: detection

KW - Stars: individual: EPIC248847494

KW - Planetary systems

KW - Techniques: photometric

KW - Techniques: radial velocities

KW - Techniques: spectroscopic

U2 - 10.1051/0004-6361/201833569

DO - 10.1051/0004-6361/201833569

M3 - Article

SN - 0004-6361

VL - 615

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - L13

ER -

Transiting planet candidate from K2 with the longest period

Abstract

Keywords

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