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NGTS-11 b (TOI-1847 b): A Transiting Warm Saturn Recovered from a TESS Single-transit Event

Gill, Samuel and Wheatley, Peter J. and Cooke, Benjamin F. and Jordán, Andrés and Nielsen, Louise D. and Bayliss, Daniel and Anderson, David R. and Vines, Jose I. and Lendl, Monika and Acton, Jack S. and Armstrong, David J. and Bouchy, François and Brahm, Rafael and Bryant, Edward M. and Burleigh, Matthew R. and Casewell, Sarah L. and Eigmüller, Philipp and Espinoza, Néstor and Gillen, Edward and Goad, Michael R. and Grieves, Nolan and Günther, Maximilian N. and Henning, Thomas and Hobson, Melissa J. and Hogan, Aleisha and Jenkins, James S. and McCormac, James and Moyano, Maximiliano and Osborn, Hugh P. and Pollacco, Don and Queloz, Didier and Rauer, Heike and Raynard, Liam and Rojas, Felipe and Sarkis, Paula and Smith, Alexis M.S. and Pinto, Marcelo Tala and Tilbrook, Rosanna H. and Udry, Stéphane and Watson, Christopher A. and West, Richard G. (2020) NGTS-11 b (TOI-1847 b): A Transiting Warm Saturn Recovered from a TESS Single-transit Event. Astrophysical Journal Letters, 898 (1), L11. Institute of Physics (IOP) Publishing. doi: 10.3847/2041-8213/ab9eb9. ISSN 2041-8205.

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Official URL: https://iopscience.iop.org/article/10.3847/2041-8213/ab9eb9

Abstract

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 ( Teff?--> <!-- --> = 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±0.0280.032?--> <!-- --> RJup?--> <!-- --> , a mass of 0.344±0.0920.073?--> <!-- --> MJup?--> <!-- --> , and an equilibrium temperature of just 435±3432?--> <!-- --> 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.

Item URL in elib:https://elib.dlr.de/136669/
Document Type:Article
Title:NGTS-11 b (TOI-1847 b): A Transiting Warm Saturn Recovered from a TESS Single-transit Event
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gill, SamuelDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Wheatley, Peter J.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Cooke, Benjamin F.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Jordán, AndrésFacultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile; Millennium Institute for Astrophysics, ChileUNSPECIFIED
Nielsen, Louise D.Observatoire astronomique de l'Université de Genève, Chemin des maillettes 51, 1290 Sauverny, SwitzerlandUNSPECIFIED
Bayliss, DanielDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Anderson, David R.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Vines, Jose I.Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, ChileUNSPECIFIED
Lendl, MonikaObservatoire astronomique de l'Université de Genève, Chemin des maillettes 51, 1290 Sauverny, Switzerland; Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, A-8042 Graz, AustriaUNSPECIFIED
Acton, Jack S.School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Armstrong, David J.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Bouchy, FrançoisObservatoire astronomique de l'Université de Genève, Chemin des maillettes 51, 1290 Sauverny, SwitzerlandUNSPECIFIED
Brahm, RafaelFacultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile; Millennium Institute for Astrophysics, ChileUNSPECIFIED
Bryant, Edward M.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Burleigh, Matthew R.School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Casewell, Sarah L.School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Espinoza, NéstorSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAUNSPECIFIED
Gillen, EdwardWinton Fellow.; Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Goad, Michael R.School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Grieves, NolanObservatoire astronomique de l'Université de Genève, Chemin des maillettes 51, 1290 Sauverny, SwitzerlandUNSPECIFIED
Günther, Maximilian N.Juan Carlos Torres Fellow.; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA 02139, USAUNSPECIFIED
Henning, ThomasMax-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, GermanyUNSPECIFIED
Hobson, Melissa J.Millennium Institute for Astrophysics, Chile; Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, ChileUNSPECIFIED
Hogan, AleishaSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Jenkins, James S.Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, ChileUNSPECIFIED
McCormac, JamesDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte, Angamos 0610, 1270709 Antofagasta, ChileUNSPECIFIED
Osborn, Hugh P.Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA 02139, USA; NCCR/PlanetS, Centre for Space & Habitability, University of Bern, Bern, SwitzerlandUNSPECIFIED
Pollacco, DonDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Queloz, DidierAstrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Rauer, HeikeHeiker.Rauer (at) dlr.deUNSPECIFIED
Raynard, LiamSchool of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Rojas, FelipeMillennium Institute for Astrophysics, Chile; Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, ChileUNSPECIFIED
Sarkis, PaulaMax-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, GermanyUNSPECIFIED
Smith, Alexis M.S.alexis.smith (at) dlr.deUNSPECIFIED
Pinto, Marcelo TalaMillennium Institute for Astrophysics, Chile; Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, D-69117 Heidelberg, GermanyUNSPECIFIED
Tilbrook, Rosanna H.School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Udry, StéphaneObservatoire astronomique de l'Université de Genève, Chemin des maillettes 51, 1290 Sauverny, SwitzerlandUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIED
West, Richard G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Date:2020
Journal or Publication Title:Astrophysical Journal Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:898
DOI :10.3847/2041-8213/ab9eb9
Page Range:L11
Publisher:Institute of Physics (IOP) Publishing
ISSN:2041-8205
Status:Published
Keywords:Exoplanet astronomy, Exoplanet detection methods, Exoplanets, Extrasolar gas giants, Photometry, High resolution spectroscopy, 486, 489, 498, 509, 1234, 2096, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Eigmüller, Dr. Philipp
Deposited On:04 Nov 2020 08:18
Last Modified:04 Nov 2020 08:18

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