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

Labadie-Bartz, Jonathan and Rodriguez, Joseph E. and Stassun, Keivan G. and Ciardi, David R. and Penev, Kaloyan and Johnson, Marshall C. and Gaudi, B. Scott and Colon, Knicole D. and Bieryla, Allyson and Latham, David W. and Pepper, Joshua and Collins, Karen A. and Evans, Phil and Relles, Howard and Siverd, Robert J. and Bento, Joao and Yao, Xinyu and Stockdale, Chris and Tan, Thiam-Guan and Zhou, George ORCID: and Eastman, Jason D. and Albrow, Michael D. and Bayliss, Daniel and Beatty, Thomas G. and Berlind, Perry and Bozza, Valerio and Calkins, Michael L. and Cohen, David H. and Curtis, Ivan A. and Esquerdo, Gilbert A. and Feliz, Dax and Fulton, Benjamin J. and Gregorio, Joao and James, David and Jensen, Eric L. N. and Johnson, John A. and Johnson, Samson A. and Joner, Michael D. and Kasper, David and Kielkopf, John F. and Kuhn, Rudolf B. and Lund, Michael B. and Malpas, Amber and Manner, Mark and McCrady, Nate and McLeod, Kim K. and Oberst, Thomas E. and Penny, Matthew T. and Reed, Phillip A. and Sliski, David H. and Stephens, Denise C. and Stevens, Daniel J. and Villanueva, Steven, Jr. and Wittenmyer, Robert A. and Wright, J. T. and Zambelli, Roberto (2019) KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin. The Astrophysical Journal Supplement Series, 240 (1):13. pp. 1-17. ISSN 0067-0049

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We present the discovery of KELT-22Ab, a hot Jupiter from the KELT-South survey. KELT-22Ab transits the moderately bright (V similar to 11.1) Sun-like G2V star TYC 7518-468-1. The planet has an orbital period of P = 1.3866529 +/- 0.0000027 days, a radius of R-P = 1.285(-0.071)(+0.12) R-J, and a relatively large mass of M-P = 3.47(-0.14)(+0.15), M-J. The star has R-star = 1.099(-0.046)(0.079) R-circle dot, M-star = 1.092(-0.041)(+0.045) M-circle dot, T-eff = 5767(-49)(+50) K, log g(star) = 4.393(-0.060)(+0.039) (cgs), and [m/H] = +0.259(-0.083)(+0.085); 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 '' (similar to 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 a/R-star, 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.

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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: 28 Jan 2022 00:53
Last Modified: 02 Feb 2022 05:08
Uncontrolled Keywords: methods: observational; planets and satellites: detection; planets; and satellites: gaseous planets; techniques: photometric; techniques:; radial velocities; techniques: spectroscopic; Astrophysics - Earth and; Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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