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arxiv: 1912.01017 · v1 · pith:I6GHMYL5new · submitted 2019-12-02 · 🌌 astro-ph.EP · astro-ph.SR

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

Romy Rodr\'iguez Mart\'inez , B. Scott Gaudi , Joseph E. Rodriguez , George Zhou , Jonathan Labadie-Bartz , Samuel N. Quinn , Kaloyan Minev Penev , Thiam-Guan Tan
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David W. Latham Leonardo A. Paredes John Kielkopf Brett C. Addison Duncan J. Wright Johanna K. Teske Steve B. Howell David R. Ciardi Carl Ziegler Keivan G. Stassun Marshall C. Johnson Jason D. Eastman Robert J. Siverd Thomas G. Beatty Luke G. Bouma Joshua Pepper Michael B. Lund Steven Villanueva Daniel J. Stevens Eric L. N. Jensen Coleman Kilby David H. Cohen Daniel Bayliss Allyson Bieryla Phillip A. Cargile Karen A. Collins Dennis M. Conti Knicole D. Colon Ivan A. Curtis Darren L. DePoy Phil A. Evans Dax Feliz Joao Gregorio Jason Rothenberg David J. James Matthew T. Penny Phillip A. Reed Howard M. Relles Denise C. Stephens Michael D. Joner Rudolf B. Kuhn Chris Stockdale Mark Trueblood Patricia Trueblood Xinyu Yao Roberto Zambelli Roland Vanderspek Sara Seager Joshua N. Winn Jon M. Jenkins Todd J. Henry Hodari-Sadiki James Wei-Chun Jao Sharon X. Wang R. Paul Butler Jeffrey D. Crane Ian B. Thompson Stephen Schectman Robert A. Wittenmyer Timothy R. Bedding Jack Okumura Peter Plavchan Brendan P. Bowler Jonathan Horner Stephen R. Kane Matthew W. Mengel Timothy D. Morton C. G. Tinney Hui Zhang Nicholas J. Scott Rachel A. Matson Mark E. Everett Andrei Tokovinin Andrew W. Mann Diana Dragomir Maximilian N. Guenther Eric B. Ting Michael Fausnaugh Ana Glidden Elisa V. Quintana Mark Manner Jennifer L. Marshall Kim K. McLeod Somayeh Khakpash
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classification 🌌 astro-ph.EP astro-ph.SR
keywords kelt-26bstarkelt-25borbittesscompaniontextita-stars
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We present the discoveries of KELT-25b (TIC 65412605, TOI-626.01) and KELT-26b (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 \textit{TESS} photometry. KELT-25b is on a 4.40-day orbit around the V = 9.66 star CD-24 5016 ($T_{\rm eff} = 8280^{+440}_{-180}$ K, $M_{\star}$ = $2.18^{+0.12}_{-0.11}$ $M_{\odot}$), while KELT-26b is on a 3.34-day orbit around the V = 9.95 star HD 134004 ($T_{\rm eff}$ =$8640^{+500}_{-240}$ K, $M_{\star}$ = $1.93^{+0.14}_{-0.16}$ $M_{\odot}$), which is likely an Am star. We have confirmed the sub-stellar nature of both companions through detailed characterization of each system using ground-based and \textit{TESS} photometry, radial velocity measurements, Doppler Tomography, and high-resolution imaging. For KELT-25, we determine a companion radius of $R_{\rm P}$ = $1.64^{+0.039}_{-0.043}$ $R_{\rm J}$, and a 3-sigma upper limit on the companion's mass of $\sim64~M_{\rm J}$. For KELT-26b, we infer a planetary mass and radius of $M_{\rm P}$ = $1.41^{+0.43}_{-0.51}$ $M_{\rm J}$ and $R_{\rm P}$ = $1.940^{+0.060}_{-0.058}$ $R_{\rm J}$. From Doppler Tomographic observations, we find KELT-26b to reside in a highly misaligned orbit. This conclusion is weakly corroborated by a subtle asymmetry in the transit light curve from the \textit{TESS} data. KELT-25b appears to be in a well-aligned, prograde orbit, and the system is likely a member of a cluster or moving group.

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