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American Astronomical Society, Astronomical Journal, 3(160), p. 111, 2020

DOI: 10.3847/1538-3881/ab9f2d

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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

Journal article published in 2020 by Romy Rodríguez Martínez ORCID, B. Scott Gaudi ORCID, B. Scott Gaudi, Joseph E. Rodriguez ORCID, George Zhou ORCID, Jonathan Labadie-Bartz ORCID, Samuel N. Quinn ORCID, Kaloyan Penev ORCID, Thiam-Guan Tan ORCID, David W. Latham ORCID, Leonardo A. Paredes, John F. Kielkopf ORCID, Brett Addison ORCID, Duncan J. Wright, Johanna Teske ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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 ( K, M = M ), while KELT-26 b is on a 3.34 day orbit around the V = 9.95 star HD 134004 ( = K, M = 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 R P = R J and a 3σ upper limit on the companion’s mass of ∼64 M J. For KELT-26 b, we infer a planetary mass and radius of M P = and R P = R J. 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.