Kelt-17b: A Hot-Jupiter Transiting an a-Star in a Misaligned Orbit Detected With Doppler Tomography

Zhou, George; Rodriguez, Joseph E.; Collins, Karen A.; Beatty, Thomas G.; Oberst, Thomas E.; Heintz, Tyler M.; Stassun, Keivan G.; Latham, David W.; Kuhn, Rudolf B.; Bieryla, Allyson; Lund, Michael B.; Labadie-Bartz, Jonathan; Siverd, Robert J.; Stevens, Daniel J.; Gaudi, B. Scott; Pepper, Joshua; Buchhave, Lars A.; Eastman, Jason D.; Colón, Knicole D.; Cargile, Phillip A.; James, D. J.; Gregorio, J.; Reed, Phillip A.; Jensen, Eric L. N.; Cohen, David H.; McLeod, Kim K.; Tan, T. G.; Zambelli, Roberto; Bayliss, Daniel; Bento, J.; Esquerdo, Gilbert A.; Berlind, P.; Calkins, M.; Blancato, Kirsten; Manner, Mark; Samulski, Camile; Stockdale, C. J.; Nelson, Peter; Stephens, Denise C.; Curtis, Ivan A.; Kielkopf, John F.; Fulton, Benjamin J.; DePoy, D. L.; Marshall, J. L.; Pogge, Richard W.; Gould, A.; Trueblood, Mark; Trueblood, P.

doi:10.3847/0004-6256/152/5/136

Cited by 84 publications

(64 citation statements)

References 92 publications

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“…The evidence for this comes from several sources that we review briefly. However, we invite the reader to review papers by Bieryla et al (2015), Zhou et al (2016a, 2016b), and Hartman et al (2015 for a more detailed explanation. The basic point is that the RV measurements, while not sufficiently precise to measure the mass of the transiting companion, do indicate that it is not a brown dwarf or a low-mass star, if it is indeed transiting the primary A star.…”

Section: False-positive Analysismentioning

confidence: 99%

“…To date, this strategy of targeting hot stars has led to the discovery of four planets transiting A stars by the KELT survey: KELT-17b (Zhou et al 2016b), KELT-9b (Gaudi et al 2017), KELT-20b/MASCARA-2b (Lund et al 2017;Talens et al 2017b), and , the planet announced here. Additionally, there are four planets known to transit A stars discovered by other collaborations: WASP-33b (Collier Cameron et al 2010), Kepler-13Ab (Shporer et al 2011), HAT-P-57b (Hartman et al 2015), and MASCARA-1b (Talens et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

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

Siverd

Collins

Zhou

et al. 2017

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We present the discovery of the giant planet , which transits the moderately bright (Ṽ 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  M 4.1 J ( s 3 ), and a clear Doppler tomography signal, which indicates a retrograde projected spin-orbit misalignment of l = - 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 »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.

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Section: False-positive Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Siverd

Collins

Zhou

et al. 2017

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“…The evidence for this comes from several sources that we will briefly review; however, we invite the reader to review Bieryla et al (2015), Zhou et al (2016aZhou et al ( , 2016b, and Hartman et al (2015) for a more detailed explanation. Of course, the first system to have been validated in this way was WASP-33b (Collier Cameron et al 2010).…”

Section: False-positive Analysismentioning

confidence: 99%

KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early A Star HD 185603

Lund

Rodriguez

Zhou

et al. 2017

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We report the discovery of KELT-20b, a hot Jupiter transiting a V 7.6 early A star, HD 185603, with an orbital period of P 3.47  days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we infer that KELT-20 is a rapidly rotating ) . We place a 3s upper limit of M 3.5 J on the mass of the planet. Doppler tomographic 1 measurements indicate that the planetary orbit normal is well aligned with the projected spin axis of the star ( 3 . 4 2 . 1 l =    ). The inclination of the star is constrained to I 24 . 4 155 . 6 *  < <  , implying a three-dimensional spin-orbit alignment of 1 . 3 69 . 8 y  < <  . KELT-20b receives an insolation flux of 8 10 erg s cm 9 1 2´--, implying an equilibrium temperature of of ∼2250 K, assuming zero albedo and complete heat redistribution. Due to the high stellar T eff , KELT-20b also receives an ultraviolet (wavelength d 91.2  nm) insolation flux of 9.1 10 erg s cm 4 1 2´--, possibly indicating significant atmospheric ablation. Together with WASP-33, Kepler-13 A, HAT-P-57, KELT-17, and KELT-9, KELT-20 is the sixth A star host of a transiting giant planet, and the thirdbrightest host (in V ) of a transiting planet.

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“…The radial velocities are described by an arbitrary offset γ and orbital semi-amplitude K. The orbital eccentricity parameters w e cos and w e sin are also included when eccentricity is allowed to vary. The Doppler tomographic signal is modeled as per Zhou et al (2016b) via a 2D integration of the stellar surface covered by the planet. The free parameters that describe the Doppler tomography effect include the projected spin-orbit angle λ and the projected rotational broadening velocity  v I sin .…”

Section: Global Fitting and Derived Planet Parametersmentioning

confidence: 99%

HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography^∗

Zhou¹,

Bakos²,

Hartman³

et al. 2017

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We report the discovery of HAT-P-67b, which is a hot-Saturn transiting a rapidly rotating F-subgiant. HAT-P-67b has a radius of = host star in a ∼4.81 day period orbit. We place an upper limit on the mass of the planet via radial velocity measurements to be < M M 0.59 p J , and a lower limit of > M 0.056 J by limitations on Roche lobe overflow. Despite being a subgiant, the host star still exhibits relatively rapid rotation, with a projected rotational velocity of35.8 1.1 km s 1 , which makes it difficult to precisely determine the mass of the planet using radial velocities. We validated HAT-P-67b via two Doppler tomographic detections of the planetary transit, which eliminate potential eclipsing binary blend scenarios. The Doppler tomographic observations also confirm that HAT-P-67b has an orbit that is aligned to within 12°, in projection, with the spin of its host star. HAT-P-67b receives strong UV irradiation and is among one of the lowest density planets known, which makes it a good candidate for future UV transit observations in the search for an extended hydrogen exosphere.

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Kelt-17b: A Hot-Jupiter Transiting an a-Star in a Misaligned Orbit Detected With Doppler Tomography

Cited by 84 publications

References 92 publications

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

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

KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early A Star HD 185603

HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography^∗

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Kelt-17b: A Hot-Jupiter Transiting an a-Star in a Misaligned Orbit Detected With Doppler Tomography

Cited by 84 publications

References 92 publications

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

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

KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early A Star HD 185603

HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography∗

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HAT-P-67b: An Extremely Low Density Saturn Transiting an F-subgiant Confirmed via Doppler Tomography^∗