SIMBAD references

2018AJ....155..100J - Astron. J., 155, 100-100 (2018/February-0)

KELT-21b: a hot Jupiter transiting the rapidly rotating metal-poor late-A primary of a likely hierarchical triple system.

JOHNSON M.C., RODRIGUEZ J.E., ZHOU G., GONZALES E.J., CARGILE P.A., CREPP J.R., PENEV K., STASSUN K.G., GAUDI B.S., COLON K.D., STEVENS D.J., STRASSMEIER K.G., ILYIN I., COLLINS K.A., KIELKOPF J.F., OBERST T.E., MARITCH L., REED P.A., GREGORIO J., BOZZA V., NOVATI S.C., D'AGO G., SCARPETTA G., ZAMBELLI R., LATHAM D.W., BIERYLA A., COCHRAN W.D., ENDL M., TAYAR J., SERENELLI A., SILVA AGUIRRE V., CLARKE S.P., MARTINEZ M., SPENCER M., TRUMP J., JONER M.D., BUGG A.G., HINTZ E.G., STEPHENS D.C., ARREDONDO A., BENZAID A., YAZDI S., McLEOD K.K., JENSEN E.L.N., HANCOCK D.A., SORBER R.L., KASPER D.H., JANG-CONDELL H., BEATTY T.G., CARROLL T., EASTMAN J., JAMES D., KUHN R.B., LABADIE-BARTZ J., LUND M.B., MALLONN M., PEPPER J., SIVERD R.J., YAO X., COHEN D.H., CURTIS I.A., DEPOY D.L., FULTON B.J., PENNY M.T., RELLES H., STOCKDALE C., TAN T.-G. and VILLANUEVA S.

Abstract (from CDS):

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 1.586–0.040+0.039 RJ. We set an upper limit on the planetary mass of MP 3.91 MJ 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○^. The star has Teff=7598–84+81 K, M*=1.458–0.028+0.029  M, R*=1.638 ±0.034  R, and vsinI*=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  M, 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.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): planets and satellites: detection - planets and satellites: gaseous planets - methods: observational - stars: individual: HD 332124 - techniques: photometric - techniques: radial velocities - techniques: radial velocities

Simbad objects: 23

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2018AJ....155..100J and select 'bookmark this link' or equivalent in the popup menu


2021.01.18-06:32:52

© Université de Strasbourg/CNRS

    • Contact