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KELT-25 b and KELT-26 b: A Hot Jupiter and a Substellar Companion Transiting Young A Stars Observed by TESS

September 2020 • 2020AJ....160..111R

Authors • Rodríguez Martínez, Romy • Gaudi, B. Scott • Rodriguez, Joseph E. • Zhou, George • Labadie-Bartz, Jonathan • Quinn, Samuel N. • Penev, Kaloyan • Tan, Thiam-Guan • Latham, David W. • Paredes, Leonardo A. • Kielkopf, John F. • Addison, Brett • Wright, Duncan J. • Teske, Johanna • Howell, Steve B. • Ciardi, David • Ziegler, Carl • Stassun, Keivan G. • Johnson, Marshall C. • Eastman, Jason D. • Siverd, Robert J. • Beatty, Thomas G. • Bouma, Luke • Bedding, Timothy • Pepper, Joshua • Winn, Joshua • Lund, Michael B. • Villanueva, Steven, Jr. • Stevens, Daniel J. • Jensen, Eric L. N. • Kilby, Coleman • Crane, Jeffrey D. • Tokovinin, Andrei • Everett, Mark E. • Tinney, C. G. • Fausnaugh, Michael • Cohen, David H. • Bayliss, Daniel • Bieryla, Allyson • Cargile, Phillip A. • Collins, Karen A. • Conti, Dennis M. • Colón, Knicole D. • Curtis, Ivan A. • Depoy, D. L. • Evans, Phil • Feliz, Dax L. • Gregorio, Joao • Rothenberg, Jason • James, David J. • Joner, Michael D. • Kuhn, Rudolf B. • Manner, Mark • Khakpash, Somayeh • Marshall, Jennifer L. • McLeod, Kim K. • Penny, Matthew T. • Reed, Phillip A. • Relles, Howard M. • Stephens, Denise C. • Stockdale, Chris • Trueblood, Mark • Trueblood, Pat • Yao, Xinyu • Zambelli, Roberto • Vanderspek, Roland • Seager, Sara • Jenkins, Jon M. • Henry, Todd J. • James, Hodari-Sadiki • Jao, Wei-Chun • Wang, Sharon Xuesong • Butler, Paul • Thompson, Ian • Shectman, Stephen • Wittenmyer, Robert • Bowler, Brendan P. • Horner, Jonathan • Kane, Stephen R. • Mengel, Matthew W. • Morton, Timothy D. • Okumura, Jack • Plavchan, Peter • Zhang, Hui • Scott, Nicholas J. • Matson, Rachel A. • Mann, Andrew W. • Dragomir, Diana • Günther, Max • Ting, Eric B. • Glidden, Ana • Quintana, Elisa V.

Abstract • 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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David Ciardi

Senior Scientist