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26 April 2024 |
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KELT-8b: A highly inflated transiting hot Jupiter and a new technique for extracting high-precision radial velocities from noisy spectra | | Benjamin J. Fulton
; Karen A. Collins
; B. Scott Gaudi
; Keivan G. Stassun
; Joshua Pepper
; Thomas G. Beatty
; Robert J. Siverd
; Kaloyan Penev
; Andrew W. Howard
; Christoph Baranec
; Giorgio Corfini
; Jason D. Eastman
; Joao Gregorio
; Nicholas M. Law
; Michael B. Lund
; Thomas E. Oberst
; Matthew T. Penny
; Reed Riddle
; Joseph E. Rodriguez
; Daniel J. Stevens
; Roberto Zambelli
; Carl Ziegler
; Allyson Bieryla
; Giuseppe D’Ago
; Darren L. DePoy
; Eric L. N. Jensen
; John F. Kielkopf
; David W. Latham
; Mark Manner
; Jennifer Marshall
; Kim K. McLeod
; Phillip A. Reed
; | | Date: |
25 May 2015 | | Abstract: | We announce the discovery of a highly inflated transiting hot Jupiter
discovered by the KELT-North survey. A global analysis including constraints
from isochrones indicates that the V = 10.8 host star (HD 343246) is a mildly
evolved, G dwarf with $T_{
m eff} = 5754_{-55}^{+54}$ K, $log{g} =
4.078_{-0.054}^{+0.049}$, $[Fe/H] = 0.272pm0.038$, an inferred mass
$M_{*}=1.211_{-0.066}^{+0.078}$ M$_{odot}$, and radius
$R_{*}=1.67_{-0.12}^{+0.14}$ R$_{odot}$. The planetary companion has mass $M_P
= 0.867_{-0.061}^{+0.065}$ $M_{J}$, radius $R_P = 1.86_{-0.16}^{+0.18}$
$R_{J}$, surface gravity $log{g_{P}} = 2.793_{-0.075}^{+0.072}$, and density
$
ho_P = 0.167_{-0.038}^{+0.047}$ g cm$^{-3}$. The planet is on a roughly
circular orbit with semimajor axis $a = 0.04571_{-0.00084}^{+0.00096}$ AU and
eccentricity $e = 0.035_{-0.025}^{+0.050}$. The best-fit linear ephemeris is
$T_0 = 2456883.4803 pm 0.0007$ BJD$_{
m TDB}$ and $P = 3.24406 pm 0.00016$
days. This planet is one of the most inflated of all known transiting
exoplanets, making it one of the few members of a class of extremely low
density, highly-irradiated gas giants. The low stellar $log{g}$ and large
implied radius are supported by stellar density constraints from follow-up
light curves, plus an evolutionary and space motion analysis. We also develop a
new technique to extract high precision radial velocities from noisy spectra
that reduces the observing time needed to confirm transiting planet candidates.
This planet boasts deep transits of a bright star, a large inferred atmospheric
scale height, and a high equilibrium temperature of $T_{eq}=1675^{+61}_{-55}$
K, assuming zero albedo and perfect heat redistribution, making it one of the
best targets for future atmospheric characterization studies. | | Source: | arXiv, 1505.6738 | | Services: | Forum | Review | PDF | Favorites | |
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