Kelt-19Ab: A P ~ 4.6-day Hot Jupiter Transiting a Likely Am Star with a Distant Stellar Companion

Simple item page
dc.contributor.authorSiverd, Robert J.en_US
dc.contributor.authorCollins, Karen A.en_US
dc.contributor.authorZhou, Georgeen_US
dc.contributor.authorQuinn, Samuel N.en_US
dc.contributor.authorGaudi, B. Scotten_US
dc.contributor.authorStassun, Keivan G.en_US
dc.contributor.authorJohnson, Marshall C.en_US
dc.contributor.authorPenev, Kaloyanen_US
dc.contributor.utdAuthorPenev, Kaloyanen_US
dc.date.accessioned2018-11-05T21:15:34Z
dc.date.available2018-11-05T21:15:34Z
dc.date.created2017-12-22en_US
dc.date.issued2018-11-05
dc.descriptionFull text access from Treasures at UT Dallas is restricted to current UTD affiliates.en_US
dc.description.abstractWe present the discovery of the giant planet KELT-19Ab, which transits the moderately bright (V similar to 9.9) A8V star TYC 764-1494-1 with an orbital period of 4.61 days. We confirm the planetary nature of the companion via a combination of. radial velocities, which limit the mass to less than or similar to 4.1 M-J (3 sigma), and a clear Doppler tomography signal, which indicates a retrograde projected spin-orbit misalignment of lambda = -179.7(-3.7)(+3.8) degrees. Global modeling indicates that the T-eff=7500. 110 K host star has M-star = 1.62(-0.20)(+0.25) M-star and R-star = 1.83 +/- 0.10 R-circle dot. The planet has a radius of R-P = 1.91 +/- 0.11 R-J and receives a stellar insolation flux of similar to 3.2 x 10(9) erg s(-1) cm(-2), leading to an inferred equilibrium temperature of T-eq similar to 1935 K assuming zero albedo and complete heat redistribution. With a v sin I-* = 84.8 +/- 2.0 km s(-1), the host. is relatively slowly rotating compared to other stars with similar effective temperatures, and it appears to be enhanced in metallic elements but deficient in calcium, suggesting that it is likely an Am star. KELT-19A would be the first detection of an Am host of a transiting planet of which we are aware. Adaptive optics observations of the system reveal the existence of a companion with late-G9V/early-K1V spectral type at a projected separation of approximate to 160 au. Radial velocity measurements indicate that this companion is bound. Most Am stars are known to have stellar companions, which are often invoked to explain the relatively slow rotation of the primary. In this case, the stellar companion is unlikely to have caused the tidal braking of the primary. However, it may have emplaced the transiting planetary companion via the Kozai-Lidov mechanism.en_US
dc.description.departmentSchool of Natural Sciences and Mathematicsen_US
dc.description.sponsorshipNSF CAREER Grant AST-1056524; National Science Foundation Graduate Research Fellowship under Grant No. DGE-1343012; NASA Hubble Fellowship grant HST-HF2-51402.001-A; NASA, under contract NAS 5-26555; National Aeronautics and Space Administration (EPSCOR grant NNX13AM97A); the Australian Research Council (LIEF grant LE140100050), and the National Science Foundation (grants 1516242 and 1608203).en_US
dc.identifier.bibliographicCitationSiverd, Robert J., Karen A. Collins, George Zhou, Samuel N. Quinn, et al. 2018. "KELT-19Ab: A P similar to 4.6-day hot Jupiter transiting a likely am star with a distant stellar companion." Astronomical Journal 155(1), doi:10.3847/1538-3881/aa9e4den_US
dc.identifier.issn0004-6256en_US
dc.identifier.issue1en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/6296
dc.identifier.volume155en_US
dc.publisherIOP Publishing Ltden_US
dc.relation.urihttp://dx.doi.org/10.3847/1538-3881/aa9e4d
dc.rights©2017 The American Astronomical Society. All Rights Reserved.en_US
dc.sourceAstronomical Journal
dc.subjectOuter planetsen_US
dc.subjectExtrasolar planetsen_US
dc.subjectDouble starsen_US
dc.subjectSpectroscopic imagingen_US
dc.subjectPlanets—Surfacesen_US
dc.subjectStars--Motion in line of sighten_US
dc.titleKelt-19Ab: A P ~ 4.6-day Hot Jupiter Transiting a Likely Am Star with a Distant Stellar Companionen_US

Files

Original bundle

Now showing 1 - 1 of 1
Thumbnail Image
Name:
NSM-6247-8488.69-LINK.pdf
Size:
165.68 KB
Format:
Adobe Portable Document Format
Description:
Article
Download

Collections

Penev, Kaloyan