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McLeod, Kim K.; Rodriguez, Joseph E.; Oelkers, Ryan J.; Collins, Karen A.; Bieryla, Allyson; Fulton, Benjamin J.; Stassun, Keivan G.; Gaudi, B. Scott; Penev, Kaloyan; Stevens, Daniel J.; Colón, Knicole D.; Pepper, Joshua; Narita, Norio; Tsuguru, Ryu; Fukui, Akihiko; Reed, Phillip A.; Tirrell, Bethany; Visgaitis, Tiffany; Kielkopf, John F.; Cohen, David H.; Jensen, Eric L. N.; Gregorio, Joao; Ba türk, Özgür; Oberst, Thomas E.; Melton, Casey; Kempton, Eliza M.-R.; Baldrige, Andrew; Zhao, Y. Sunny; Zambelli, Roberto; Latham, David W.; Esquerdo, Gilbert A.; Berlind, Perry; Calkins, Michael L.; Howard, Andrew W.; Isaacson, Howard; Weiss, Lauren M.; Benni, Paul; Beatty, Thomas G.; Eastman, Jason D.; Penny, Matthew T.; Siverd, Robert J.; Lund, Michael B.; Labadie-Bartz, Jonathan; Zhou, G.; Curtis, Ivan A.; Joner, Michael D.; Manner, Mark; Relles, Howard; Scarpetta, Gaetano; Stephens, Denise C.; Stockdale, Chris; Tan, T. G.; DePoy, D. L.; Marshall, Jennifer L.; Pogge, Richard W.; Trueblood, Mark; Trueblood, Patricia
The Astronomical journal, 06/2017, Letnik: 153, Številka: 6Journal Article
We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87-day orbit around the bright (V = 10.1), hot, F4V star BD+60 1538 (TYC 3865-1173-1). We present follow-up photometry, spectroscopy, and adaptive optics imaging that allow a detailed characterization of the system. Our preferred model fits yield a host stellar temperature of K and a mass of , situating it as one of only a handful of known transiting planets with hosts that are as hot, massive, and bright. The planet has a mass of , a radius of , and a density of , making it one of the most inflated planets known around a hot star. We argue that KELT-18b's high temperature and low surface gravity, which yield an estimated ∼600 km atmospheric scale height, combined with its hot, bright host, make it an excellent candidate for observations aimed at atmospheric characterization. We also present evidence for a bound stellar companion at a projected separation of ∼1100 au, and speculate that it may have contributed to the strong misalignment we suspect between KELT-18's spin axis and its planet's orbital axis. The inferior conjunction time is 2457542.524998 0.000416 (BJDTDB) and the orbital period is 2.8717510 0.0000029 days. We encourage Rossiter-McLaughlin measurements in the near future to confirm the suspected spin-orbit misalignment of this system.
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