Kepler-432: A Red Giant Interacting With One of Its Two Long-Period Giant Planets

Quinn, Samuel N.; White, T. R.; Latham, David W.; Chaplin, W. J.; Handberg, R.; Huber, Daniel; Kipping, David; Payne, Matthew J.; Jiang, Chen; Aguirre, V. Silva; Stello, Dennis; Sliski, David H.; Ciardi, David R.; Buchhave, Lars A.; Bedding, Timothy R.; Davies, G. R.; Hekker, S.; Kjeldsen, H.; Kuszlewicz, James S.; Everett, Mark E.; Howell, Steve B.; Basu, Sarbani; Campante, Tiago L.; Christensen‐Dalsgaard, J.; Elsworth, Y.; Karoff, C.; Kawaler, Steven D.; Lund, M. N.; Lundkvist, M.; Esquerdo, Gilbert A.; Calkins, M.; Berlind, P.

doi:10.1088/0004-637x/803/2/49

Cited by 74 publications

(28 citation statements)

References 136 publications

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“…Two additional planethosting evolved stars have had their line-of-sight stellar inclination measured via asteroseismology. Quinn et al (2015) found the super-Jupiter Kepler-432b to be spin-orbit aligned in a eccentric, with a 53 day period orbit around a red- Figure 6. Model evolutionary tracks of effective temperature-luminosity (left) and effective temperature-stellar density (right) from the Geneva isochrones (Ekström et al 2012) are plotted for solar metallicity stars of various masses and rotation rates.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, transit surveys have successfully discovered planets around high mass stars. These include planets around subgiants and giants whose shallow transits were identified by Kepler (e.g., Kepler-56b,c, Huber et al 2013;Kepler-91b, Lillo-Box et al 2014;Kepler-432b, Ciceri et al 2015, Quinn et al 2015KOI-206b and KOI680b, Almenara et al 2015;and K2-39b, Van Eylen et al 2016) and hot-Jupiters around main-sequence A-stars confirmed via Doppler tomography (WASP-33b, Collier Cameron et al 2010b;Kepler-13b, Shporer et al 2011, Szabó et al 2011, Johnson et al 2014; HAT-P-57b, Hartman et al 2015;and KELT-17b, Zhou et al 2016b).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…The great diversity of discovered planetary systems is bringing a number of fundamental clues about the processes of planet formation and evolution. Moreover, Kepler has also revealed exoplanets around a diversity of hosts from M-dwarfs (Dressing & Charbonneau 2015) to giant stars (Quinn et al 2015) and binaries (Doyle et al 2011).…”

Section: Introductionmentioning

confidence: 99%

New planetary and eclipsing binary candidates from campaigns 1−6 of the K2 mission

Barros

Deleuil

2016

A&A

104

122

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Context. With only two functional reaction wheels, Kepler cannot maintain stable pointing at its original target field and has entered a new mode of observation called K2. Aims. We describe a new pipeline to reduce K2 pixel files into light curves that are later searched for transit like features. Methods. Our method is based on many years of experience in planet hunting for the CoRoT mission. Owing to the unstable pointing, K2 light curves present systematics that are correlated with the target position in the charge coupled device (CCD). Therefore, our pipeline also includes a decorrelation of this systematic noise. Our pipeline is optimised for bright stars for which spectroscopic follow-up is possible. We achieve a maximum precision on 6 hours of 6 ppm. The decorrelated light curves are searched for transits with an adapted version of the CoRoT alarm pipeline. Results. We present 172 planetary candidates and 327 eclipsing binary candidates from campaigns 1, 2, 3, 4, 5, and 6 of K2. Both the planetary candidates and eclipsing binary candidates lists are made public to promote follow-up studies. The light curves will also be available to the community.

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“…We obtained the following orbital parameter for HIP 67851 c: P = 2131.8 ± 88.3 d, m c sin i = 6.0 ± 0.8 M J , and e = 0.17 ± 0.06. Apart from HIP 67851, there are eight giant stars (log g < ∼ 3.6) that are known to host multiplanet systems 3 : namely, 24 Sextantis and HD 200964 (Johnson et al 2011), HD 4732 (Sato et al 2013 (Huber et al 2013), Kepler 432 (Ciceri et al 2015;Ortiz et al 2015;Quinn et al 2015), Kepler 391 (Rowe et al 2014), η Ceti (Trifonov et al 2014), and TYC 1422-614-1 (Niedzielski et al 2015. Interestingly, η Ceti is the only one that is located in the clump region, although according to Trifonov et al (2014) it is most likely a RGB star instead of a HB star.…”

Section: Summary and Discussionmentioning

confidence: 99%

Giant planets around two intermediate-mass evolved stars and confirmation of the planetary nature of HIP 67851c

Jones

Jenkins

Rojo

et al. 2015

A&A

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Context. Precision radial velocities are required to discover and characterize exoplanets. Optical spectra that exhibit many hundreds of absorption lines can allow the m s −1 precision levels required for this work. After the main-sequence, intermediate-mass stars expand and rotate more slowly than their progenitors, thus, thousands of spectral lines appear in the optical region, permitting the search for Doppler signals in these types of stars. Aims. In 2009, we began the EXPRESS program, aimed at detecting substellar objects around evolved stars, and studying the effects of the mass and evolution of the host star on their orbital and physical properties. Methods. We obtained precision radial velocity measurements for the giant stars HIP 65891 and HIP 107773, from CHIRON and FEROS spectra. Also, we obtained new radial velocity epochs for the star HIP 67851, which is known to host a planetary system. Additionally, HIP 67851 is one of five giant stars that are known to host a planetary system having a close-in planet (a < 0.7 AU). Based on the evolutionary states of those five stars, we conclude that close-in planets do exist in multiple systems around subgiants and slightly evolved giants stars, but most likely they are subsequently destroyed by the stellar envelope during the ascent of the red giant branch phase.

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Kepler-432: A Red Giant Interacting With One of Its Two Long-Period Giant Planets

Cited by 74 publications

References 136 publications

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

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

New planetary and eclipsing binary candidates from campaigns 1−6 of the K2 mission

Giant planets around two intermediate-mass evolved stars and confirmation of the planetary nature of HIP 67851c

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Kepler-432: A Red Giant Interacting With One of Its Two Long-Period Giant Planets

Cited by 74 publications

References 136 publications

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

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

New planetary and eclipsing binary candidates from campaigns 1−6 of the K2 mission

Giant planets around two intermediate-mass evolved stars and confirmation of the planetary nature of HIP 67851c

Contact Info

Product

Resources

About

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

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