arXiv · 1912.01017
KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS
Abstract
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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Romy Rodríguez Martínez, B. Scott Gaudi, Joseph E. Rodriguez, George Zhou, Jonathan Labadie-Bartz, Samuel N. Quinn, Kaloyan Minev Penev, Thiam-Guan Tan, 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. 2019-12-02. KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS. https://doi.org/10.3847/1538-3881/ab9f2d
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