Investigating the planet–metallicity correlation for hot Jupiters

Osborn, Ares

doi:10.1093/mnras/stz3207

Cited by 25 publications

(11 citation statements)

References 54 publications

(87 reference statements)

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“…HD 83443 is a solar mass K0 star, with more than twice the metallicity of the Sun. This enhanced metallicity is consistent the well-established giant-planetmetallicity correlation (e.g., Jones et al 2016;Ghezzi et al 2018;Osborn & Bayliss 2020;Fulton et al 2021). For the orbit fitting and derivation of planetary parameters, we adopt a stellar mass of 1.00 ± 0.03 M e (Delgado Mena et al 2019).…”

Section: Stellar Properties Of Hd83443supporting

confidence: 74%

HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit

Errico¹,

Wittenmyer²,

Horner³

et al. 2022

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We report the discovery of a highly eccentric long-period Jovian planet orbiting the hot-Jupiter host HD 83443. By combining radial velocity data from four instruments (AAT/UCLES, Keck/HIRES, HARPS, Minerva-Australis) spanning more than two decades, we find evidence for a planet with m sin i = 1.35 − 0.06 + 0.07 M J, moving on an orbit with a = 8.0 ± 0.8 au and eccentricity e = 0.76 ± 0.05. We combine our radial velocity analysis with Gaia eDR3 /Hipparcos proper motion anomalies and derive a dynamical mass of 1.5 − 0.2 + 0.5 M Jup . We perform a detailed dynamical simulation that reveals locations of stability within the system that may harbor additional planets, including stable regions within the habitable zone of the host star. HD 83443 is a rare example of a system hosting a hot Jupiter and an exterior planetary companion. The high eccentricity of HD 83443c suggests that a scattering event may have sent the hot Jupiter to its close orbit while leaving the outer planet on a wide and eccentric path.

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Section: Stellar Properties Of Hd83443supporting

confidence: 74%

HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit

Errico¹,

Wittenmyer²,

Horner³

et al. 2022

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“…Over twenty years ago, studies showed that stars hosting hot-Jupiters (giant planets in very short period orbits) are typically iron-enriched compared to the Sun (Gonzalez 1997;Santos, Israelian & Mayor 2001;Fischer & Valenti 2005). This trend has, however, weakened in more recent studies (Osborn & Bayliss 2019;Teske et al 2019). Similarly, the relationship between a star's iron abundance and the number of planets it hosts remains the subject of significant debate (e.g.…”

Section: Introductionmentioning

confidence: 99%

The GALAH Survey: using galactic archaeology to refine our knowledge of TESS target stars

Clark

Clerte

Hinkel

et al. 2021

Monthly Notices of the Royal Astronomical Society

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An unprecedented number of exoplanets are being discovered by the Transiting Exoplanet Survey Satellite (TESS). Determining the orbital parameters of these exoplanets, and especially their mass and radius, will depend heavily upon the measured physical characteristics of their host stars. We have cross-matched spectroscopic, photometric, and astrometric data from GALAH Data Release 2, the TESS Input Catalog and Gaia Data Release 2, to create a curated, self-consistent catalog of physical and chemical properties for 47,285 stars. Using these data we have derived isochrone masses and radii that are precise to within 5%. We have revised the parameters of three confirmed, and twelve candidate, TESS planetary systems. These results cast doubt on whether CTOI-20125677 is indeed a planetary system since the revised planetary radii are now comparable to stellar sizes. Our GALAH-TESS catalog contains abundances for up to 23 elements. We have specifically analysed the molar ratios for C/O, Mg/Si, Fe/Si and Fe/Mg, to assist in determining the composition and structure of planets with Rp < 4R⊕. From these ratios, 36 % fall within 2 sigma of the Sun/Earth values, suggesting that these stars may host rocky exoplanets with geological compositions similar to planets found within our own Solar system.

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“…While high metallicities are expected for stars which host close-in giant exoplanets (Fischer & Valenti 2005), we find that WASP-47 and 55-Cancri have high metallicities even compared to the metallicity distribution for hot-Jupiter host stars. Osborn & Bayliss (2020) investigated this planet-metallicity correlation using a homogeneous sample of 217 hot Jupiter host stars. We find that WASP-47 is more metal rich than 96% of that sample, and 55-Cancri is more metal rich than 94%.…”

Section: Discussionmentioning

confidence: 99%

Revisiting WASP-47 with ESPRESSO and TESS

Bryant,

Bayliss

2022

Preprint

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WASP-47 hosts a remarkable planetary system containing a hot Jupiter (WASP-47 b; P = 4.159 days) with an inner super-Earth (WASP-47 e; P = 0.7896 days), a close-orbiting outer Neptune (WASP-47 d; P = 9.031 days), and a long period giant planet (WASP-47 c; P = 588.4 days). We use the new TESS photometry to refine the orbital ephemerides of the transiting planets in the system, particularly the hot Jupiter WASP-47 b, for which we find an update equating to a 17.4 min shift in the transit time. We report new radial velocity measurements from the ESPRESSO spectrograph for WASP-47, which we use to refine the masses of WASP-47 d and WASP-47 e, with a high cadence observing strategy aimed to focus on the super-Earth WASP-47 e. We detect a periodic modulation in the K2 photometry that corresponds to a 32.5±3.9 day stellar rotation, and find further stellar activity signals in our ESPRESSO data consistent with this rotation period. For WASP-47 e we measure a mass of 6.77 ± 0.57 M ⊕ and a bulk density of 6.29 ± 0.60 g cm −3 , giving WASP-47 e the second most precisely measured density to date of any super-Earth. The mass and radius of WASP-47 e, combined with the exotic configuration of the planetary system, suggest the WASP-47 system formed through a mechanism different to systems with multiple small planets or more typical isolated hot Jupiters.

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Investigating the planet–metallicity correlation for hot Jupiters

Cited by 25 publications

References 54 publications

HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit

HD 83443c: A Highly Eccentric Giant Planet on a 22 yr Orbit

The GALAH Survey: using galactic archaeology to refine our knowledge of TESS target stars

Revisiting WASP-47 with ESPRESSO and TESS

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