TOI-836

Author(s): Faith Hawthorn, Daniel Bayliss, Thomas G. Wilson, Andrea Bonfanti, Vardan Adibekyan, Yann Alibert, Sérgio G. Sousa, Karen A. Collins, Edward M. Bryant, Ares Osborn, David J. Armstrong, Lyu Abe, Jack S. Acton, Brett C. Addison, Karim Agabi, Roi Alonso, Douglas R. Alves, Guillem Anglada-Escudé, Tamas Bárczy, Thomas Barclay, David Barrado, Susana C.C. Barros, Wolfgang Baumjohann, Philippe Bendjoya, Willy Benz, Allyson Bieryla, Xavier Bonfils, François Bouchy, Alexis Brandeker, Christopher Broeg, David J.A. Brown, Matthew R. Burleigh, Marco Buttu, Juan Cabrera, Douglas A. Caldwell, Sarah L. Casewell, David Charbonneau, Sébastian Charnoz, Ryan Cloutier, Andrew Collier Cameron, Kevin I. Collins, Dennis M. Conti, Nicolas Crouzet, Szilárd Czismadia, Melvyn B. Davies, Magali Deleuil, Elisa Delgado-Mena, Laetitia Delrez, Olivier D.S. Demangeon, Brice Olivier Demory, Georgina Dransfield, Xavier Dumusque, Jo Ann Egger, David Ehrenreich, Philipp Eigmüller, Anders Erickson, Zahra Essack, Andrea Fortier, Luca Fossati, Malcolm Fridlund, Maximilian N. Günther, Manuel Güdel, Davide Gandolfi, Harvey Gillard, Michaël Gillon, Crystal Gnilka, Michael R. Goad, Robert F. Goeke, Tristan Guillot, Andreas Hadjigeorghiou, Coel Hellier, Beth A. Henderson, Kevin Heng, Matthew J. Hooton, Keith Horne, Steve B. Howell, Sergio Hoyer, Jonathan M. Irwin, James S. Jenkins, Jon M. Jenkins, Eric L.N. Jensen, Stephen R. Kane, Alicia Kendall, John F. Kielkopf, Laszlo L. Kiss, Gaia Lacedelli, Jacques Laskar, David W. Latham, Alain Lecavalier des Etangs, Adrien Leleu, Monika Lendl, Jorge Lillo-Box, Christophe Lovis, Djamel Mékarnia, Bob Massey, Tamzin Masters, Pierre F.L. Maxted, Valerio Nascimbeni, Louise D. Nielsen, Sean M. O’Brien, Göran Olofsson, Hugh P. Osborn, Isabella Pagano, Enric Pallé, Carina M. Persson, Giampaolo Piotto, Peter Plavchan, Don Pollacco, Didier Queloz, Roberto Ragazzoni, Heike Rauer, Ignasi Ribas, George Ricker, Damien Ségransan, Sébastien Salmon, Alexandre Santerne, Nuno C. Santos, Gaetano Scandariato, François Xavier Schmider, Richard P. Schwarz, Sara Seager, Avi Shporer, Attila E. Simon, Alexis M.S. Smith, Gregor Srdoc, Manfred Steller, Olga Suarez, Gyula M. Szabó, Johanna Teske, Nicolas Thomas, Rosanna H. Tilbrook, Amaury H.M.J. Triaud, Stéphane Udry, Valérie Van Grootel, Nicholas Walton, Sharon X. Wang, Peter J. Wheatley, Joshua N. Winn, Robert A. Wittenmyer, Hui Zhang
Abstract: We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright (T = 8.5 mag), high proper motion (∼200 mas yr⁻¹), low metallicity ([Fe/H]≈−0.28) K-dwarf with a mass of 0.68 ± 0.05 M and a radius of 0.67 ± 0.01 R. We obtain photometric follow-up observations with a variety of facilities, and we use these data sets to determine that the inner planet, TOI-836 b, is a 1.70 ± 0.07 R super-Earth in a 3.82-d orbit, placing it directly within the so-called ‘radius valley’. The outer planet, TOI-836 c, is a 2.59 ± 0.09 R mini-Neptune in an 8.60-d orbit. Radial velocity measurements reveal that TOI-836 b has a mass of 4.5 ± 0.9 M, while TOI-836 c has a mass of 9.6 ± 2.6 M. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 min for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.
Organisation(s): Department of Astrophysics
External organisation(s): University of Warwick, University of St. Andrews, Österreichische Akademie der Wissenschaften (ÖAW), Universidade do Porto, Universität Bern, Harvard-Smithsonian Center for Astrophysics, Université Côte d'Azur, University of Leicester, University of Southern Queensland, Institute of Astrophysics of the Canary Islands, University of La Laguna, Universidad de Chile, Universitat Autònoma de Barcelona , Spanish National Research Council (CSIC), Institute of Space Studies of Catalonia (IEEC), Admatis Ltd., National Aeronautics & Space Administration (NASA), University of Maryland, Baltimore, European Space Astronomy Centre (ESA), University of Grenoble Alpes, Université de Genève, Stockholm University, Concordia Research Station, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), NASA Ames Research Center, Université de Paris, George Mason University, American Association of Variable Star Observers (AAVSO), Science and Operations Department - Science Division (SCI-SC), Lund University, Aix-Marseille Université, Université de Liège, University of Birmingham, Massachusetts Institute of Technology, Leiden University, Chalmers University of Technology, Università degli Studi di Torino, California Institute of Technology (Caltech), Keele University, University of Cambridge, Universidad Diego Portales, Swarthmore College, University of California, Riverside, University of Louisville, Eötvös Loránd Research Network, Eötvös Loránd University Budapest, Osservatorio Astronomico, Université de recherche Paris Sciences et Lettres, Université Paris VI - Pierre-et-Marie-Curie, Villa’39 Observatory, European Southern Observatory (Germany), Queen's University Belfast, INAF-Osservatorio Astrofisico di Catania, University of Padova, Eidgenössische Technische Hochschule Zürich, Chinese Academy of Sciences (CAS), Technische Universität Berlin, Freie Universität Berlin (FU), Patashnick Voorheesville Observatory, Kotizarovci Observatory, Carnegie Institution for Science, Tsinghua University, Princeton University
Journal: Monthly Notices of the Royal Astronomical Society
Volume: 520
Pages: 3649-3668
No. of pages: 20
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stad306
Publication date: 04-2023
Peer reviewed: Yes
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics
Keywords
ASJC Scopus subject areas: Astronomy and Astrophysics, Space and Planetary Science
Portal url: https://ucrisportal.univie.ac.at/en/publications/7f52043b-8b0c-48a3-acc1-699e822a170c

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