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HD 219666 b : a hot-Neptune from TESS Sector 1
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(2019) HD 219666 b : a hot-Neptune from TESS Sector 1. Astronomy & Astrophysics, 623 . A165. doi:10.1051/0004-6361/201834853
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WRAP-HD-219666-b-hot-Neptune-from-TESS-Sector-1-Armstrong-2019.pdf - Accepted Version - Requires a PDF viewer. Download (2603Kb) | Preview |
Official URL: http://dx.doi.org/10.1051/0004-6361/201834853
Abstract
We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD219666 (Mstar = 0.92 +/- 0.03 MSun, Rstar = 1.03 +/- 0.03 RSun, tau_star = 10 +/- 2 Gyr). With a mass of Mb = 16.6 +/- 1.3 MEarth, a radius of Rb = 4.71 +/- 0.17 REarth, and an orbital period of P ~ 6 days, HD219666b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD219666 (also known as TOI-118) in its Sector 1 and the light curve shows four transit-like events, equally spaced in time. We confirmed the planetary nature of the candidate by gathering precise radial-velocity measurements with HARPS@ESO3.6m. We used the co-added HARPS spectrum to derive the host star fundamental parameters (Teff = 5527 +/- 65 K, log g = 4.40 +/- 0.11 (cgs), [Fe/H]= 0.04 +/- 0.04 dex, log R'HK = -5.07 +/- 0.03), as well as the abundances of many volatile and refractory elements. The host star brightness (V = 9.9) makes it suitable for further characterisation by means of in-transit spectroscopy. The determination of the planet orbital obliquity, along with the atmospheric metal-to-hydrogen content and thermal structure could provide us with important clues on the formation mechanisms of this class of objects.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QB Astronomy | ||||||
| Divisions: | Faculty of Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets, Planetary systems | ||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||
| Publisher: | EDP Sciences | ||||||
| ISSN: | 0004-6361 | ||||||
| Official Date: | 28 March 2019 | ||||||
| Dates: |
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| Volume: | 623 | ||||||
| Article Number: | A165 | ||||||
| DOI: | 10.1051/0004-6361/201834853 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Publisher Statement: | The material cannot be used for any other purpose without further permission of the publisher, and is for private use only. | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Copyright Holders: | © ESO 2019 | ||||||
| RIOXX Funder/Project Grant: |
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