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        Transits of Known Planets Orbiting a Naked-Eye Star

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        2007.10995v1.pdf (PDF, 2Mb)
        Author
        Kane, Stephen R.
        Yalçınkaya, Selçuk
        Osborn, Hugh P.
        Dalba, Paul A.
        Nielsen, Louise D.
        Vanderburg, Andrew
        Močnik, Teo
        Hinkel, Natalie R.
        Ostberg, Colby
        Esmer, Ekrem Murat
        Udry, Stéphane
        Fetherolf, Tara
        Baştürk, Özgür
        Ricker, George R.
        Vanderspek, Roland
        Latham, David W.
        Seager, Sara
        Winn, Joshua N.
        Jenkins, Jon M.
        Allart, Romain
        Bailey, Jeremy
        Bean, Jacob L.
        Bouchy, Francois
        Butler, R. Paul
        Campante, Tiago L.
        Carter, Brad D.
        Daylan, Tansu
        Deleuil, Magali
        Diaz, Rodrigo F.
        Dumusque, Xavier
        Ehrenreich, David
        Horner, Jonathan
        Howard, Andrew W.
        Isaacson, Howard
        Jones, Hugh R. A.
        Kristiansen, Martti H.
        Lovis, Christophe
        Marcy, Geoffrey W.
        Marmier, Maxime
        O'Toole, Simon J.
        Pepe, Francesco
        Ragozzine, Darin
        Ségransan, Damien
        Tinney, C. G.
        Turnbull, Margaret C.
        Wittenmyer, Robert A.
        Wright, Duncan J.
        Wright, Jason T.
        Attention
        2299/23430
        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 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.
        Publication date
        2020-09-01
        Published in
        The Astronomical Journal
        Published version
        https://doi.org/10.3847/1538-3881/aba835
        Other links
        http://hdl.handle.net/2299/23430
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