KELT-25 b and KELT-26 b: A Hot Jupiter and a Substellar Companion Transiting Young A Stars Observed by TESS
Creators: name: Dragomir, D.
name: Bouma, L.
name: Matson, R.A.
name: Jensen, E.L.N.
name: Joner, M.D.
name: Glidden, A.
name: Evans, P.
name: Beatty, T.G.
name: Penev, K.
name: Kuhn, R.B.
name: Bayliss, D.
name: Fausnaugh, M.
name: Gaudi, B.S.
name: Plavchan, P.
name: Stephens, D.C.
name: James, D.J.
name: Lund, M.B.
name: James, H.-S.
name: Marshall, J.L.
name: Gregorio, J.
name: Seager, S.
name: Colón, K.D.
name: Zambelli, R.
name: Tinney, C.G.
name: Shectman, S.
name: Crane, J.D.
name: Relles, H.M.
name: Feliz, D.L.
name: Conti, D.M.
name: Ciardi, D.
name: Cargile, P.A.
name: Yao, X.
name: Trueblood, M.
name: Johnson, M.C.
name: Wang, S.X.
name: Penny, M.T.
name: Labadie-Bartz, J.
name: Depoy, D.L.
name: Ting, E.B.
name: Mengel, M.W.
name: Paredes, L.A.
name: Cohen, D.H.
name: Quinn, S.N.
name: Stockdale, C.
name: Kielkopf, J.F.
name: Bowler, B.P.
name: Martínez, R.R.
name: Howell, S.B.
name: Kane, S.R.
name: Jenkins, J.M.
name: Mcleod, K.K.
name: Henry, T.J.
name: Khakpash, S.
name: Vanderspek, R.
name: Bedding, T.
name: Mann, A.W.
name: Wittenmyer, R.
name: Zhou, G.
name: Siverd, R.J.
name: Reed, P.A.
name: Scott, N.J.
name: Thompson, I.
name: Stevens, D.J.
name: Quintana, E.V.
name: Okumura, J.
name: Latham, D.W.
name: Manner, M.
name: Eastman, J.D.
name: Teske, J.
name: Trueblood, P.
name: Everett, M.E.
name: Zhang, H.
name: Butler, P.
name: Stassun, K.G.
name: Villanueva, S.
name: Morton, T.D.
name: Curtis, I.A.
name: Rodriguez, J.E.
name: Rothenberg, J.
name: Addison, B.
name: Jao, W.-C.
name: Winn, J.
name: Günther, M.
name: Ziegler, C.
name: Tan, T.-G.
name: Tokovinin, A.
name: Kilby, C.
name: Pepper, J.
name: Wright, D.J.
name: Horner, J.
name: Collins, K.A.
name: Bieryla, A.
Publisher: name: IOP Publishing Ltd
Year: 2020

description: 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 (Teff=8280-180+440 K, M ∗ = 2.18-0.11+0.12 M o˙), while KELT-26 b is on a 3.34 day orbit around the V = 9.95 star HD 134004 (Teff = 8640-240+500 K, M ∗ = 1.93-0.16+0.14 M o˙), 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 = 1.64-0.043+0.039 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 = 1.41-0.51+0.43MJ and R P = 1.94-0.058+0.060 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.