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KELT-18b: Puffy Planet, Hot Host, Probably Perturbed | | Kim K. McLeod
; Joseph E. Rodriguez
; Ryan J. Oelkers
; Karen A. Collins
; Allyson Bieryla
; Benjamin J. Fulton
; Keivan G. Stassun
; B. Scott Gaudi
; Kaloyan Penev
; Daniel J. Stevens
; Knicole D. Colón
; Joshua Pepper
; Norio Narita
; Ryu Tsuguru
; Akihiko Fukui
; Phillip A. Reed
; Bethany Tirrell
; Tiffany Visgaitis
; John F. Kielkopf
; David H. Cohen
; Eric L. N. Jensen
; Joao Gregorio
; Özgür Baştürk
; Thomas E. Oberst
; Casey Melton
; Eliza M.-R. Kempton
; Andrew Baldridge
; Y. Sunny Zhao
; Roberto Zambelli
; David W. Latham
; Gilbert A. Esquerdo
; Perry Berlind
; Michael L. Calkins
; Andrew W. Howard
; Howard Isaacson
; Lauren M. Weiss
; Thomas G. Beatty
; Jason D. Eastman
; Matthew T. Penny
; Robert J. Siverd
; Michael B. Lund
; Jonathan Labadie-Bartz
; G. Zhao
; Ivan A. Curtis
; Michael D. Joner
; Mark Manner
; Howard Relles
; Gaetano Scarpetta
; Denise C. Stephens
; Chris Stockdale
; T.G. Tan
; D. L. DePoy
; Jennifer L. Marshall
; Richard W. Pogge
; Mark Trueblood
; Patricia Trueblood
; | | Date: |
6 Feb 2017 | | Abstract: | We report the discovery of KELT-18b, a transiting hot Jupiter in a 2.87d
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 6670+/-120 K and a mass of 1.524+/-0.069 Msun,
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 1.18+/-0.11
Mjup, a radius of 1.57+/-0.04 Rjup, and a density of 0.377+/-0.040 g/cm^3,
making it one of the most inflated planets known around a hot star. We argue
that KELT-18b’s high temperature, low surface gravity, and 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
(BJD_TDB) 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. | | Source: | arXiv, 1702.1657 | | Services: | Forum | Review | PDF | Favorites | |
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