Transits of Known Planets Orbiting a Naked-Eye Star

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 AllartJeremy 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

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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 1.482-0.056+0.058 R ⊕ and 2.608-0.077+0.078 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 ρb = 7.8-1.1+1.2 g cm-3 and ρc = 3.50-0.36+0.41 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.

Original languageEnglish
Article number129
Number of pages10
JournalThe Astronomical Journal
Issue number3
Early online date21 Aug 2020
Publication statusPublished - 1 Sept 2020


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