Transiting planet candidate from K2 with the longest period

被引：14
作者：
Giles, H. A. C. [1 ]
Osborn, H. P. [2 ]
Blanco-Cuaresma, S. [3 ]
Lovis, C. [1 ]
Bayliss, D. [4 ]
Eggenberger, P. [1 ]
Cameron, A. Collier [5 ]
Kristiansen, M. H. [6 ,7 ]
Turner, O. [1 ]
Bouchy, F. [1 ]
Udry, S. [1 ]
机构：
[1] Univ Geneva, Observ Geneva, Chemin Maillettes 51, CH-1290 Versoix, Switzerland
[2] Aix Marseille Univ, CNRS, LAM, Marseille, France
[3] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
[4] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England
[5] Univ St Andrews, Sch Phys & Astron, Ctr Exoplanet Sci, SUPA, North Haugh, St Andrews KY16 9SS, Fife, Scotland
[6] Tech Univ Denmark, Natl Space Inst, DTU Space, Elektrovej 327, DK-2800 Lyngby, Denmark
[7] Brorfelde Observ, Observator Gyldenkernes Vej 7, DK-4340 Tollose, Denmark
来源：
ASTRONOMY & ASTROPHYSICS | 2018年 / 615卷
基金：
瑞士国家科学基金会;
关键词：
planets and satellites: detection; stars: individual: EPIC248847494; planetary systems; techniques: photometric; techniques: radial velocities; techniques: spectroscopic; ALL-SKY; SEARCH;
D O I：
10.1051/0004-6361/201833569
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页数：5
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