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

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 3 upper limit on the companions mass of64 M J. For KELT-26 b, we infer a planetary mass and radius of M P = m{J}}}$?> 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.

published proceedings

  • ASTRONOMICAL JOURNAL

altmetric score

  • 15.08

author list (cited authors)

  • Martinez, R. R., Gaudi, B. S., Rodriguez, J. E., Zhou, G., Labadie-Bartz, J., Quinn, S. N., ... Quintana, E. V.

citation count

  • 25

complete list of authors

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

publication date

  • September 2020