1. KELT-25 b and KELT-26 b: A Hot Jupiter and a Substellar Companion Transiting Young A Stars Observed by TESS
- Author
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Romy Rodríguez Martínez, B. Scott Gaudi, Joseph E. Rodriguez, George Zhou, Jonathan Labadie-Bartz, Samuel N. Quinn, Kaloyan Penev, Thiam-Guan Tan, David W. Latham, Leonardo A. Paredes, John F. Kielkopf, Brett C. Addison, Duncan J. Wright, Johanna 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 Bouma, Timothy Bedding, Joshua Pepper, Joshua N. Winn, Michael B. Lund, Steven Villanueva Jr, Daniel J. Stevens, Eric L. N. Jensen, Coleman Kilby, Jeffrey D. Crane, Andrei Tokovinin, Mark E. Everett, Chris G. Tinney, Michael Martin Fausnaugh, David H Cohen, Daniel Bayliss, Allyson Bieryla, Phillip A. Cargile, Karen A. Collins, Dennis M. Conti, Knicole Colon, Ivan A. Curtis, D. L. Depoy, Phil Evans, Dax L. Feliz, Joao Gregorio, Jason Rothenberg, David J. James, Michael D. Joner, Rudolf B. Kuhn, Mark Manner, Somayeh Khakpash, Jennifer L. Marshall, Kim K. McLeod, Matthew T. Penny, Phillip A. Reed, Howard M. Relles, Denise C. Stephens, Chris Stockdale, Mark Trueblood, Pat Trueblood, Xinyu Yao, Roberto Zambelli, Roland Vanderspek, Sara Seager, Jon M Jenkins, Todd J. Henry, Hodari-Sadiki James, Wei-Chun Jao, Sharon Xuesong Wang, Aaron Paul Butler, Ian Thompson, Stephen Shectman, Robert A. Wittenmyer, Brendan P. Bowler, Jonathan Horner, Stephen R. Kane, Matthew W. Mengel, Timothy D. Morton, Jack Okumura, Peter Plavchan, Hui Zhang, Nicholas Joseph Scott, Rachel A. Matson, Andrew W. Mann, Diana Dragomir, Max Günther, Eric B Ting, Ana Glidden, and Elisa Victoria Quintana
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Astronomy - 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(=-+T8280eff180440K,Må=-+2.180.110.12Me), while KELT-26 b is on a 3.34 day orbit around the V=9.95 star HD 134004 (Teff=-+8640240500K,Må=-+1.930.160.14Me), 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=-+1.640.0430.039RJ and a 3σupper limit on the companion’s mass of64MJ. For KELT-26 b, we infer a planetary mass and radius of MP=-+1.410.510.43MJ and RP=-+1.940.0580.060RJ. 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.
- Published
- 2020
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