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20 April 2024

» arxiv » 2005.0006

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NGTS-11 b / TIC-54002556 b: A transiting warm Saturn recovered from aTESSsingle-transit event
Samuel Gill ; Peter J. Wheatley ; Benjamin F. Cooke ; Andrés Jordán ; Louise D. Nielsen ; Daniel Bayliss ; David R. Anderson ; Jose I. Vines ; Monika Lendl ; Jack S. Acton ; David J. Armstrong ; François Bouchy ; Rafael Brahm ; Edward M. Bryant ; Matthew R. Burleigh ; Sarah L. Casewell ; Philipp Eigmüller ; Néstor Espinoza ; Edward Gillen ; Michael R.Goad ; Nolan Grieves ; Maximilian N. Günther ; Thomas Henning ; Melissa J. Hobson ; Aleisha Hogan ; James S. Jenkins ; James McCormac ; Maximiliano Moyano ; Hugh P. Osborn ; Don Pollacco ; Didier Queloz ; Heike Rauer ; Felipe Rojas ; Paula Sarkis ; Alexis M. S. Smith ; Marcelo Tala Pinto ; Rosanna H. Tilbrook ; Stéphane Udry ; Christopher A. Watson ; Richard G. West ;
Date:	30 Apr 2020
Abstract:	We report the discovery of NGTS-11 b (=TIC-54002556 b), a transiting Saturn in a 35.46-day orbit around a mid K-type star (Teff=5050+-80 K). The system was initially identified from a single-transit event in our TESS full-frame image light-curves. Following seventy-nine nights of photometric monitoring with an NGTS telescope, we observed a second full transit of NGTS-11 b approximately one year after the TESS single-transit event. The NGTS transit confirmed the parameters of the transit signal and restricted the orbital period to a set of 13 discrete periods. We combined our transit detections with precise radial velocity measurements to determine the true orbital period and measure the mass of the planet. We find NGTS-11 b has a radius of 0.823+-0.035 RJup, a mass of 0.37+-0.14 MJup, and an equilibrium temperature of just 440+-40 K, making it one of the coolest known transiting gas giants. NGTS-11 b is the first exoplanet to be discovered after being initially identified as a TESS single transit event, and its discovery highlights the power of intense photometric monitoring in recovering longer-period transiting exoplanets from single-transit events.
Source:	arXiv, 2005.0006
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