KELT-21b: A Hot Jupiter Transiting the Rapidly Rotating Metal-poor Late-A Primary of a Likely Hierarchical Triple System

Johnson, Marshall C., Rodriguez, Joseph E., Zhou, George, Gonzales, Erica J., Cargile, Phillip A., Crepp, Justin R., Penev, Kaloyan, Stassun, Keivan G., Gaudi, B. Scott, Colón, Knicole D., Stevens, Daniel J., Strassmeier, Klaus G., Ilyin, Ilya, Collins, Karen A., Kielkopf, John F., Oberst, Thomas E., Maritch, Luke, Reed, Phillip A., Gregorio, Joao, Bozza, Valerio, Calchi Novati, Sebastiano, D’Ago, Giuseppe, Scarpetta, Gaetano, Zambelli, Roberto, Latham, David W., Bieryla, Allyson, Cochran, William D., Endl, Michael, Tayar, Jamie, Serenelli, Aldo, Silva Aguirre, Victor, Clarke, Seth P., Martinez, Maria, Spencer, Michelle, Trump, Jason, Joner, Michael D., Bugg, Adam G., Hintz, Eric G., Stephens, Denise C., Arredondo, Anicia, Benzaid, Anissa, Yazdi, Sormeh, McLeod, Kim K., Jensen, Eric L. N., Hancock, Daniel A., Sorber, Rebecca L., Kasper, David H., Jang-Condell, Hannah, Beatty, Thomas G., Carroll, Thorsten, Eastman, Jason, James, David, Kuhn, Rudolf B., Labadie-Bartz, Jonathan, Lund, Michael B., Mallonn, Matthias, Pepper, Joshua, Siverd, Robert J., Yao, Xinyu, Cohen, David H., Curtis, Ivan A., DePoy, D. L., Fulton, Benjamin J., Penny, Matthew T., Relles, Howard, Stockdale, Christopher, Tan, Thiam-Guan, Villanueva, Steven, Jr.

KELT-21b: A Hot Jupiter Transiting the Rapidly Rotating Metal-poor Late-A Primary of a Likely Hierarchical Triple System

The Astronomical Journal, Volume 155, Issue 2


We present the discovery of KELT-21b, a hot Jupiter transiting the V = 10.5 A8V star HD 332124. The planet has an orbital period of P = 3.6127647 ± 0.0000033 days and a radius of 1.586 days and a radius of 1.586-0.040+0.039 RJupiter. We set an upper limit on the planetary mass of MP< 3.91 MJupiter at 3σ confidence. We confirmed the planetary nature of the transiting companion using this mass limit and Doppler tomographic observations to verify that the companion transits HD 332124. These data also demonstrate that the planetary orbit is well-aligned with the stellar spin, with a sky-projected spin–orbit misalignment of λ =-5.6-1.9+1.7\circ . The star has Teff=7598-84+81 K, M* =1.458-0.028+0.029 Mȯ , R* =1.638 +/- 0.034 Rȯ , and vsin I* =146 km s‑1, the highest projected rotation velocity of any star known to host a transiting hot Jupiter. The star also appears to be somewhat metal poor and α-enhanced, with [Fe/H]=-0.405-0.033+0.032 and [α/Fe] = 0.145 ± 0.053 these abundances are unusual, but not extraordinary, for a young star with thin-disk kinematics like KELT-21. High-resolution imaging observations revealed the presence of a pair of stellar companions to KELT-21, located at a separation of 1.″2 and with a combined contrast of ΔKS=6.39+/- 0.06 with respect to the primary. Although these companions are most likely physically associated with KELT-21, we cannot confirm this with our current data. If associated, the candidate companions KELT-21 B and C would each have masses of ∼0.12 Mȯ , a projected mutual separation of ∼20 au, and a projected separation of ∼500 au from KELT-21. KELT-21b may be one of only a handful of known transiting planets in hierarchical triple stellar systems.

Keywords: planets and satellites: detection, planets and satellites: gaseous planets, methods: observational, stars: individual: hd 332124, techniques: photometric, techniques: radial velocities

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