• DOI:10.3847/1538-4365/aaee7e
• Corpus ID: 54810218

KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin

@article{LabadieBartz2019KELT22AbAM,
  title={KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin},
  author={Jonathan Labadie-Bartz and Joseph E. Rodriguez and Keivan G. Stassun and David R. Ciardi and Marshall C. Johnson and B. Scott Gaudi and Kaloyan Penev and Allyson Bieryla and David W. Latham and Joshua A. Pepper and Karen A. Collins and Phil Evans and Howard M. Relles and Robert J. Siverd and Joao Bento and Xinyu Yao and Christopher Stockdale and T. G. Tan and George Zhou and Knicole D. Col{\'o}n and Jason D. Eastman and Michael D. Albrow and Amber Malpas and Daniel Bayliss and Thomas G. Beatty and Valerio Bozza and David H. Cohen and Ivan A. Curtis and Darren Lee Depoy and Dax L. Feliz and Benjamin J. Fulton and Joao Gregorio and David J. James and Hannah Jang-Condell and Eric L. N. Jensen and John Asher Johnson and Samson A. Johnson and Michael D. Joner and John F. Kielkopf and Rudolf B. Kuhn and Michael B. Lund and Mark Manner and Jennifer L. Marshall and Nate McCrady and Kim K. McLeod and T. Oberst and Matthew T. Penny and Richard W. Pogge and Phillip A. Reed and David H. Sliski and Denise Catherine Stephens and Daniel J. Stevens and Mark H. Trueblood and Patricia Trueblood and Steven Villanueva and Robert A. Wittenmyer and Jason T. Wright and Roberto Zambelli and Perry L. Berlind and M. Calkins and Gilbert A. Esquerdo},
  journal={The Astrophysical Journal Supplement Series},
  year={2019},
  volume={240}
}

• J. Labadie-Bartz, Joseph E. Rodriguez, +58 authors G. Esquerdo
• Published 20 March 2018
• Physics, Geology
• The Astrophysical Journal Supplement Series

We present the discovery of KELT-22Ab, a hot Jupiter from the KELT-South survey. KELT-22Ab transits the moderately bright (V ∼ 11.1) Sun-like G2V star TYC 7518-468-1. The planet has an orbital period of days, a radius of , and a relatively large mass of . The star has , , K, (cgs), and [m/H] = ; thus other than its slightly super-solar metallicity, it appears to be a near-solar twin. Surprisingly, KELT-22A exhibits kinematics and a Galactic orbit that are somewhat atypical for thin-disk stars. Nevertheless, the star is rotating rapidly for its estimated age, and shows evidence of chromospheric activity. Imaging reveals a slightly fainter companion to KELT-22A that is likely bound, with a projected separation of 6″ (∼1400 au). In addition to the orbital motion caused by the transiting planet, we detect a possible linear trend in the radial velocity of KELT-22A, suggesting the presence of another relatively nearby body that is perhaps non-stellar. KELT-22Ab is highly irradiated (as a consequence of the small semimajor axis of ), and is mildly inflated. At such small separations, tidal forces become significant. The configuration of this system is optimal for measuring the rate of tidal dissipation within the host star. Our models predict that, due to tidal forces, the semimajor axis is decreasing rapidly, and KELT-22Ab is predicted to spiral into the star within the next Gyr.