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NGTS-11 b / TIC-54002556 b: A transiting warm Saturn recovered from a TESS single-transit event

journal contribution
posted on 2020-05-11, 09:40 authored by 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 MS Smith, Marcelo Tala Pinto, Rosanna H Tilbrook, Stéphane Udry, Christopher A Watson, Richard G West
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.

History

Citation

Astrophysical Journal Letters (2020), In Press

Version

  • AM (Accepted Manuscript)

Published in

Astrophysical Journal Letters

Publisher

American Astronomical Society, IOP Publishing

eissn

2041-8213

Acceptance date

2020-05-04

Copyright date

2020

Publisher version

TBA

Language

en

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