http://arxiv.org/abs/1806.08757
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 hours and a 0.18%-depth. Aims: Using photometric tools and conducting radial velocity follow-up, we vet and characterise this very strong candidate. Methods: Due to a long, unknown period, standard follow-up methods need to be adapted. The transit is fitted using Namaste, and the radial velocity slope measured and compared to a grid of planet-like orbits with varying masses and periods. These utilised 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$\pm$0.12R${\rm sol}$, the planet has a radius of 1.11$\pm$0.07R${\rm Jup}$ and a period of 3650$^{\rm +1280}{\rm -1130}$ days. The radial velocity measurements constrain the mass to be less than 13M${\rm Jup}$, which implies a planetary-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.
H. Giles, H. Osborn, S. Blanco-Cuaresma, et. al.
Mon, 25 Jun 18
40/54
Comments: 5 pages, 3 figures. Accepted to A&A
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