KELT-23Ab: A Hot Jupiter Transiting a Near-solar Twin Close to the TESS and JWST Continuous Viewing Zones

Daniel Johns, Phillip A. Reed, Joseph E. Rodriguez, Joshua Pepper, Keivan G. Stassun, Kaloyan Penev, B. Scott Gaudi, Jonathan Labadie-Bartz, Benjamin J. Fulton, Samuel N. Quinn, Jason D. Eastman, David R. Ciardi, Lea Hirsch, Daniel J. Stevens, Catherine P. Stevens, Thomas E. Oberst, David H. Cohen, Eric L.N. Jensen, Paul Benni, Steven VillanuevaGabriel Murawski, Allyson Bieryla, David W. Latham, Siegfried Vanaverbeke, Franky Dubois, Steve Rau, Ludwig Logie, Ryan F. Rauenzahn, Robert A. Wittenmyer, Roberto Zambelli, Daniel Bayliss, Thomas G. Beatty, Karen A. Collins, Knicole D. Colón, Ivan A. Curtis, Phil Evans, Joao Gregorio, David James, D. L. Depoy, Marshall C. Johnson, Michael D. Joner, David H. Kasper, Somayeh Khakpash, John F. Kielkopf, Rudolf B. Kuhn, Michael B. Lund, Mark Manner, Jennifer L. Marshall, Kim K. McLeod, Matthew T. Penny, Howard Relles, Robert J. Siverd, Denise C. Stephens, Chris Stockdale, Thiam Guan Tan, Mark Trueblood, Pat Trueblood, Xinyu Yao

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We announce the discovery of KELT-23Ab, a hot Jupiter transiting the relatively bright (V = 10.3) star BD+66 911 (TYC 4187-996-1), and characterize the system using follow-up photometry and spectroscopy. A global fit to the system yields host-star properties of K, , , , (cgs), and . KELT-23Ab is a hot Jupiter with a mass of , radius of , and density of g cm-3. Intense insolation flux from the star has likely caused KELT-23Ab to become inflated. The time of inferior conjunction is and the orbital period is days. There is strong evidence that KELT-23A is a member of a long-period binary star system with a less luminous companion, and due to tidal interactions, the planet is likely to spiral into its host within roughly a gigayear. This system has one of the highest positive ecliptic latitudes of all transiting planet hosts known to date, placing it near the Transiting Planet Survey Satellite and James Webb Space Telescope continuous viewing zones. Thus we expect it to be an excellent candidate for long-term monitoring and follow up with these facilities.

Original languageEnglish (US)
Article number78
JournalAstronomical Journal
Issue number2
StatePublished - 2019


  • methods: observational
  • planets and satellites: detection
  • planets and satellites: gaseous planets
  • techniques: photometric
  • techniques: radial velocities
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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