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

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dc.contributor.ORCID0000-0003-4464-1371 (Penev, K)
dc.contributor.authorLabadie-Bartz, Jonathan
dc.contributor.authorRodriguez, Joseph E.
dc.contributor.authorStassun, Keivan G.
dc.contributor.authorCiardi, David R.
dc.contributor.authorPenev, Kaloyan
dc.contributor.authorJohnson, Marshall C.
dc.contributor.authorGaudi, B. Scott
dc.contributor.utdAuthorPenev, Kaloyan
dc.date.accessioned2020-05-28T16:50:21Z
dc.date.available2020-05-28T16:50:21Z
dc.date.issued2019-01-21
dc.descriptionDue to copyright restrictions and/or publisher's policy full text access from Treasures at UT Dallas is limited to current UTD affiliates (use the provided Link to Article).
dc.description.abstractWe 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 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_{⋆} = 1.099{_{-0.046}^{0.079}} R_{⊙}, M_{⋆} = 1.092{_{-0.041}^{+0.045}} M_{⊙}, T_{eff} = 5767{_{-49}^{+50}} K, log g_{⋆} = 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_{⋆}, 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.
dc.description.departmentSchool of Natural Sciences and Mathematics
dc.identifier.bibliographicCitationLabadie-Bartz, Jonathan, Joseph E. Rodriguez, Keivan G. Stassun, David R. Ciardi, et al. 2019. "KELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-solar Twin." Astrophysical Journal Supplement Series 240(1): 13-13.
dc.identifier.issn0067-0049
dc.identifier.issue1
dc.identifier.urihttp://dx.doi.org/10.3847/1538-4365/aaee7e
dc.identifier.urihttps://hdl.handle.net/10735.1/8658
dc.identifier.volume240
dc.language.isoen
dc.publisherIOP Publishing Ltd
dc.rights©2019 The American Astronomical Society. All Rights Reserved.
dc.source.journalAstrophysical Journal Supplement Series
dc.subjectPlanets
dc.subjectSatellites
dc.subjectStars--Motion in line of sight
dc.subjectSpectroscopic imaging
dc.subjectExtrasolar planets
dc.subjectCalibration
dc.subjectPlanets—Observations
dc.subjectPlanets--Surfaces
dc.titleKELT-22Ab: A Massive, Short-Period Hot Jupiter Transiting a Near-Solar Twin
dc.type.genrearticle

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