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KELT-12b: A $P sim 5$ Day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star | | Daniel J. Stevens
; Karen A. Collins
; B. Scott Gaudi
; Thomas G. Beatty
; Robert J. Siverd
; Allyson Bieryla
; Benjamin J. Fulton
; Justin R. Crepp
; Erica J. Gonzales
; Carl T. Coker
; Kaloyan Penev
; Keivan G. Stassun
; Eric L. N. Jensen
; Andrew W. Howard
; David W. Latham
; Joseph E. Rodriguez
; Roberto Zambelli
; Valerio Bozza
; Phillip A. Reed
; Joao Gregorio
; Lars A. Buchhave
; Joshua Pepper
; Perry Berlind
; Sebastiano Calchi Novati
; Michael L. Calkins
; Giuseppe D'Ago
; Jason D. Eastman
; Knicole D. Colón
; D. L. DePoy
; Gilbert A. Esquerdo
; Andrew Gould
; John F. Kielkopf
; Jonathan Labadie-Bartz
; Michael B. Lund
; Mark Manner
; Jennifer L. Marshall
; Kim K. McLeod
; Thomas E. Oberst
; Matthew T. Penny
; Richard W. Pogge
; Gaetano Scarpetta
; Mark Trueblood
; Patricia Trueblood
; | | Date: |
16 Aug 2016 | | Abstract: | We report the discovery of KELT-12b, a highly inflated Jupiter-mass planet
transiting a mildly evolved host star. We identified the initial transit signal
in the KELT-North survey data and established the planetary nature of the
companion through precise follow-up photometry, high-resolution spectroscopy,
precise radial velocity measurements, and high-resolution adaptive optics
imaging. Our preferred best-fit model indicates that the $V = 10.64$ host, TYC
2619-1057-1, has $T_{
m eff} = 6278 pm 51$ K, $log{g_star} =
3.89^{+0.054}_{-0.051}$, and [Fe/H] = $0.19^{+0.083}_{-0.085}$, with an
inferred mass $M_{star} = 1.59^{+0.071}_{-0.091} M_odot$ and radius $R_star
= 2.37 pm 0.18 R_odot$. The planetary companion has $M_{
m P} = 0.95 pm
0.14 M_{
m J}$, $R_{
m P} = 1.79^{+0.18}_{-0.17} R_{
m J}$, $log{g_{
m P}}
= 2.87^{+0.097}_{-0.098}$, and density $
ho_{
m P} = 0.21^{+0.075}_{-0.054}$
g cm$^{-3}$, making it one of the most inflated giant planets known. The time
of inferior conjunction in ${
m BJD_{TDB}}$ is $2457088.692055 pm 0.0009$ and
the period is $P = 5.0316144 pm 0.0000306$ days. Despite the relatively large
separation of $sim0.07$ AU implied by its $sim 5.03$-day orbital period,
KELT-12b receives significant flux of $2.93^{+0.33}_{-0.30} imes 10^9$ erg
s$^{-1}$ cm$^{-2}$ from its host. We compare the radii and insolations of
transiting giant planets around hot ($T_{
m eff} geq 6250$ K) and cool stars,
noting that the observed paucity of known transiting giants around hot stars
with low insolation is likely due to selection effects. We underscore the
significance of long-term ground-based monitoring of hot stars and space-based
targeting of hot stars with the Transiting Exoplanet Survey Satellite (TESS) to
search for inflated giants in longer-period orbits. | | Source: | arXiv, 1608.4714 | | Services: | Forum | Review | PDF | Favorites | |
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