NGTS-11 b (TOI-1847 b): A Transiting Warm Saturn Recovered from a TESS Single-transit Event
Author
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Gill, Samuel
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Wheatley, Peter J.
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Cooke, Benjamin F
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Jordán, Andrés
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Nielsen, Louise D.
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Bayliss, Daniel
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Anderson, David R.
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Vines, José I.
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Lendl, Monika
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Acton, Jack S.
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Armstrong, David J.
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Bouchy, François
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Brahm, Rafael
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Bryant, Edward M.
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Burleigh, Matthew R.
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Casewell, Sarah L.
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Eigmüller, Philipp
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Espinoza, Néstor
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Gillen, Edward
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Goad, Michael R.
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Grieves, Nolan
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Günther, Maximilian N.
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Henning, Thomas
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Hobson, Melissa J.
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Hogan, Aleisha
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Jenkins, James S.
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McCormac, James
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Moyano, Maximiliano
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Osborn, Hugh P.
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Pollacco, Don
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Queloz, Didier
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Rauer, Heike
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Raynard, Liam
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Lagos Rojas, Felipe Alejandro
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Sarkis, Paula
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Smith, Alexis M. S.
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Tala Pinto, Marcelo
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Tilbrook, Rosanna H.
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Udry, Stéphane
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Watson, Christopher A.
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West, Richard G.
Admission date
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2020-10-29T18:56:13Z
Available date
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2020-10-29T18:56:13Z
Publication date
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2020
Cita de ítem
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The Astrophysical Journal Letters, 898:L11 (6pp), 2020 July 20
es_ES
Identifier
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10.3847/2041-8213/ab9eb9
Identifier
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https://repositorio.uchile.cl/handle/2250/177481
Abstract
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We report the discovery of NGTS-11 b (=TOI-1847b), a transiting Saturn in a 35.46 day orbit around a mid K-type star (T-eff = 5050 +/- 80 K). We initially identified the system from a single-transit event in a TESS full-frame image light curve. Following 79 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 0.817 +/-(0.028)(0.032) R-Jup, a mass of 0.344 +/-(0.092)(0.073) M-Jup, and an equilibrium temperature of just 435 +/-(34)(32) 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.