Year: 2020
Type: article
Abstract: Some of the most scientifically valuable transiting planets are those that were already known from radial velocity (RV) surveys. This is primarily because their orbits are well characterized and they preferentially orbit bright stars that are the targets of RV surveys. The Transiting Exoplanet Survey Satellite (TESS) provides an opportunity to survey most of the known exoplanet systems in a systematic fashion to detect possible transits of their planets. HD 136352 (Nu2 Lupi) is a naked-eye (V = 5.78) G-type main-sequence star that was discovered to host three planets with orbital periods of 11.6, 27.6, and 108.1 days via RV monitoring with the High Accuracy Radial velocity Planet Searcher (HARPS) spectrograph. We present the detection and characterization of transits for the two inner planets of the HD 136352 system, revealing radii of R ⊕ and R ⊕ for planets b and c, respectively. We combine new HARPS observations with RV data from the Keck/High Resolution Echelle Spectrometer and the Anglo-Australian Telescope, along with TESS photometry from Sector 12, to perform a complete analysis of the system parameters. The combined data analysis results in extracted bulk density values of g cm−3 and g cm−3 for planets b and c, respectively, thus placing them on either side of the radius valley. The combination of the multitransiting planet system, the bright host star, and the diversity of planetary interiors and atmospheres means this will likely become a cornerstone system for atmospheric and orbital characterization of small worlds.
Source: The Astronomical Journal
Authors: Stephen R. Kane, Selçuk Yalçınkaya, Hugh P. Osborn, Paul A. Dalba, Louise D. Nielsen, Andrew Vanderburg, Teo Močnik, Natalie R. Hinkel, Colby Ostberg, Ekrem Murat Esmer, Stéphane Udry, Tara Fetherolf, Özgür Baştürk, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Romain Allart, Jeremy Bailey, Jacob L. Bean, Francois Bouchy, R. Paul Butler, Tiago L. Campante, Brad D. Carter, Tansu Daylan, Magali Deleuil, Rodrigo F. Diaz, Xavier Dumusque, David Ehrenreich, Jonathan Horner, Andrew W. Howard, Howard Isaacson, Hugh R. A. Jones, Martti H. Kristiansen, Christophe Lovis, Geoffrey W. Marcy, Maxime Marmier, Simon J. O’Toole, Francesco Pepe, Darin Ragozzine, Damien Ségransan, C. G. Tinney, Margaret C. Turnbull, Robert A. Wittenmyer, Duncan J. Wright, Jason T. Wright
Institutions: University of California, Riverside, Ankara University, University of Bern, Centre National de la Recherche Scientifique, Aix-Marseille Université, Laboratoire d’Astrophysique de Marseille, Center for Space and Habitability, Massachusetts Institute of Technology, University of Geneva, The University of Texas at Austin, Southwest Research Institute, Center for Astrophysics Harvard & Smithsonian, Princeton University, Ames Research Center, UNSW Sydney, University of Chicago, Carnegie Institution for Science, Earth and Planets Laboratory, Universidade do Porto, Institute of Astrophysics and Space Sciences, University of Southern Queensland, Consejo Nacional de Investigaciones Científicas y Técnicas, National University of General San Martín, International Center for Advanced Studies, California Institute of Technology, University of California, Berkeley, University of Hertfordshire, DTU Space, Technical University of Denmark, Australian Astronomical Observatory, Australian Astronomical Optics, Macquarie University, Brigham Young University, Search for Extraterrestrial Intelligence, Pennsylvania State University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, National Aeronautics and Space Administration, Vanderbilt University, California Institute of Technology, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Ames Research Center, Science Mission Directorate, Science and Technology Facilities Council
OpenAlex ID: W3044305547