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HD 219666 b : a hot-Neptune from TESS Sector 1

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Esposito, M., Armstrong, David J., Gandolfi, D., Adibekyan, V., Fridlunf, M., Santos, N. C., Livingston, J. H., Delgado Mena, E., Fossati, L., Lillo-Box, J. et al.
(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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Official URL: http://dx.doi.org/10.1051/0004-6361/201834853

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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
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:
DateEvent
28 March 2019Published
4 February 2019Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
ST/R00384X/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
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