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

Martinez, Romy Rodriguez and Gaudi, B. Scott and Rodriguez, Joseph E. and Zhou, George and Labadie-Bartz, Jonathan and Quinn, Samuel N. and Penev, Kaloyan and Tan, Thiam-Guan and Latham, David W. and Paredes, Leonardo A. and Kielkopf, John F. and Addison, Brett ORCID: https://orcid.org/0000-0003-3216-0626 and Wright, Duncan J. and Teske, Johanna and Howell, Steve B. and Ciardi, David and Ziegler, Carl and Stassun, Keivan G. and Johnson, Marshall C. and Eastman, Jason D. and Siverd, Robert J. and Beatty, Thomas G. and Bouma, Luke and Bedding, Timothy and Pepper, Joshua and Winn, Joshua and Lund, Michael B. and Villanueva Jr., Steven and Stevens, Daniel J. and Jensen, Eric L. N. and Kilby, Coleman and Crane, Jeffrey D. and Tokovinin, Andrei and Everett, Mark E. and Tinney, C. G. and Fausnaugh, Michael and Cohen, David H. and Bayliss, Daniel and Bieryla, Allyson and Cargile, Phillip A. and Collins, Karen A. and Conti, Dennis M. and Colon, Knicole D. and Curtis, Ivan A. and Depoy, D. L. and Evans, Phil and Feliz, Dax L. and Gregorio, Joao and Rothenberg, Jason and James, David J. and Joner, Michael D. and Kuhn, Rudolf B. and Manner, Mark and Khakpash, Somayeh and Marshall, Jennifer L. and McLeod, Kim K. and Penny, Matthew T. and Reed, Phillip A. and Relles, Howard M. and Stephens, Denise C. and Stockdale, Chris and Trueblood, Mark and Trueblood, Pat and Yao, Xinyu and Zambelli, Roberto and Vanderspek, Roland and Seager, Sara and Jenkins, Jon M. and Henry, Todd J. and James, Hodari-Sadiki and Jao, Wei-Chun and Wang, Sharon Xuesong and Butler, Paul and Thompson, Ian and Shectman, Stephen and Wittenmyer, Robert and Bowler, Brendan P. and Horner, Jonathan and Kane, Stephen R. and Mengel, Matthew W. and Morton, Timothy D. and Okumura, Jack and Plavchan, Peter and Zhang, Hui and Scott, Nicholas J. and Matson, Rachel A. and Mann, Andrew W. and Dragomir, Diana and Gunther, Max and Ting, Eric B. and Glidden, Ana and Quintana, Elisa V. (2020) KELT-25 b and KELT-26 b: A Hot Jupiter and a Substellar Companion Transiting Young A Stars Observed by TESS. The Astronomical Journal, 160 (3). pp. 1-21. ISSN 0004-6256

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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 (${T}_{\mathrm{eff}}={8280}_{-180}^{+440}$ K, M sstarf = ${2.18}_{-0.11}^{+0.12}$ M ⊙), while KELT-26 b is on a 3.34 day orbit around the V = 9.95 star HD 134004 (${T}_{\mathrm{eff}}$ = ${8640}_{-240}^{+500}$ K, M sstarf = ${1.93}_{-0.16}^{+0.14}$ 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 = ${1.64}_{-0.043}^{+0.039}$ 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 = ${1.41}_{-0.51}^{+0.43}$ ${M}_{{\rm{J}}}$ 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 15 Oct 2020 03:54
Last Modified: 21 Oct 2020 21:38
Uncontrolled Keywords: Rotational velocities; planet; dwarf; exoplanets; south; sun; atmospheres; abundance; selection; project
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ab9f2d
URI: http://eprints.usq.edu.au/id/eprint/39894

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