September
2020
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2020AJ....160..111R
Authors
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Rodríguez Martínez, Romy
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Gaudi, B. Scott
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Rodriguez, Joseph E.
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Zhou, George
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Labadie-Bartz, Jonathan
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Quinn, Samuel N.
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Penev, Kaloyan
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Tan, Thiam-Guan
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Latham, David W.
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Paredes, Leonardo A.
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Kielkopf, John F.
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Addison, Brett
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Wright, Duncan J.
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Teske, Johanna
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Howell, Steve B.
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Ciardi, David
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Ziegler, Carl
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Stassun, Keivan G.
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Johnson, Marshall C.
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Eastman, Jason D.
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Siverd, Robert J.
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Beatty, Thomas G.
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Bouma, Luke
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Bedding, Timothy
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Pepper, Joshua
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Winn, Joshua
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Lund, Michael B.
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Villanueva, Steven, Jr.
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Stevens, Daniel J.
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Jensen, Eric L. N.
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Kilby, Coleman
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Crane, Jeffrey D.
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Tokovinin, Andrei
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Everett, Mark E.
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Tinney, C. G.
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Fausnaugh, Michael
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Cohen, David H.
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Bayliss, Daniel
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Bieryla, Allyson
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Cargile, Phillip A.
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Collins, Karen A.
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Conti, Dennis M.
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Colón, Knicole D.
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Curtis, Ivan A.
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Depoy, D. L.
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Evans, Phil
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Feliz, Dax L.
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Gregorio, Joao
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Rothenberg, Jason
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James, David J.
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Joner, Michael D.
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Kuhn, Rudolf B.
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Manner, Mark
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Khakpash, Somayeh
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Marshall, Jennifer L.
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McLeod, Kim K.
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Penny, Matthew T.
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Reed, Phillip A.
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Relles, Howard M.
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Stephens, Denise C.
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Stockdale, Chris
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Trueblood, Mark
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Trueblood, Pat
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Yao, Xinyu
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Zambelli, Roberto
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Vanderspek, Roland
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Seager, Sara
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Jenkins, Jon M.
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Henry, Todd J.
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James, Hodari-Sadiki
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Jao, Wei-Chun
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Wang, Sharon Xuesong
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Butler, Paul
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Thompson, Ian
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Shectman, Stephen
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Wittenmyer, Robert
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Bowler, Brendan P.
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Horner, Jonathan
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Kane, Stephen R.
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Mengel, Matthew W.
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Morton, Timothy D.
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Okumura, Jack
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Plavchan, Peter
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Zhang, Hui
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Scott, Nicholas J.
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Matson, Rachel A.
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Mann, Andrew W.
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Dragomir, Diana
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Günther, Max
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Ting, Eric B.
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Glidden, Ana
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Quintana, Elisa V.
Abstract
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We present the discoveries of KELT-25 b (TIC 65412605, TOI-626.01) and KELT-26 b (TIC 160708862, TOI-1337.01), two transiting companions orbiting relatively bright, early A stars. The transit signals were initially detected by the KELT survey and subsequently confirmed by Transiting Exoplanet Survey Satellite (TESS) photometry. KELT-25 b is on a 4.40 day orbit around the V = 9.66 star CD-24 5016 ( ${T}_{\mathrm{eff}}={8280}_{-180}^{+440}$ K, M⋆ = ${2.18}_{-0.11}^{+0.12}$ M⊙), while KELT-26 b is on a 3.34 day orbit around the V = 9.95 star HD 134004 ( ${T}_{\mathrm{eff}}$ = ${8640}_{-240}^{+500}$ K, M⋆ = ${1.93}_{-0.16}^{+0.14}$ M⊙), which is likely an Am star. We have confirmed the substellar nature of both companions through detailed characterization of each system using ground-based and TESS photometry, radial velocity measurements, Doppler tomography, and high-resolution imaging. For KELT-25, we determine a companion radius of RP = ${1.64}_{-0.043}^{+0.039}$ RJ and a 3σ upper limit on the companion's mass of ∼64 MJ. For KELT-26 b, we infer a planetary mass and radius of MP = ${1.41}_{-0.51}^{+0.43}$ ${M}_{{\rm{J}}}$ and RP = ${1.94}_{-0.058}^{+0.060}$ RJ. From Doppler tomographic observations, we find KELT-26 b to reside in a highly misaligned orbit. This conclusion is weakly corroborated by a subtle asymmetry in the transit light curve from the TESS data. KELT-25 b appears to be in a well-aligned, prograde orbit, and the system is likely a member of the cluster Theia 449. * This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.
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