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

M. Esposito; D. J. Armstrong; D. Gandolfi; V. Adibekyan; M. Fridlund; N. C. Santos; J. H. Livingston; E. Delgado Mena; L. Fossati; J. Lillo-Box; O. Barragán; D. Barrado; P. E. Cubillos; B. Cooke; A. B. Justesen; F. Meru; R. F. Díaz; F. Dai; L. D. Nielsen; C. M. Persson; P. J. Wheatley; A. P. Hatzes; V. Van Eylen; M. M. Musso; R. Alonso; P. G. Beck; S. C.C. Barros; D. Bayliss; A. S. Bonomo; F. Bouchy; D. J.A. Brown; E. Bryant; J. Cabrera; W. D. Cochran; S. Csizmadia; H. Deeg; O. Demangeon; M. Deleuil; X. Dumusque; P. Eigmüller; M. Endl; A. Erikson; F. Faedi; P. Figueira; A. Fukui; S. Grziwa; E. W. Guenther; D. Hidalgo; M. Hjorth; T. Hirano; S. Hojjatpanah; E. Knudstrup; J. Korth; K. W.F. Lam; J. De Leon; M. N. Lund; R. Luque; S. Mathur; P. Montañés Rodríguez; N. Narita; D. Nespral; P. Niraula; G. Nowak; H. P. Osborn; E. Pallé; M. Pätzold; D. Pollacco; J. Prieto-Arranz; H. Rauer; S. Redfield; I. Ribas; S. G. Sousa; A. M.S. Smith; M. Tala-Pinto; S. Udry; J. N. Winn

doi:10.1051/0004-6361/201834853

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

M. Esposito, D. J. Armstrong, D. Gandolfi, V. Adibekyan, M. Fridlund, N. C. Santos, J. H. Livingston, E. Delgado Mena, L. Fossati, J. Lillo-Box, O. Barragán, D. Barrado, P. E. Cubillos, B. Cooke, A. B. Justesen, F. Meru, R. F. Díaz, F. Dai, L. D. Nielsen, C. M. PerssonP. J. Wheatley, A. P. Hatzes, V. Van Eylen, M. M. Musso, R. Alonso, P. G. Beck, S. C.C. Barros, D. Bayliss, A. S. Bonomo, F. Bouchy, D. J.A. Brown, E. Bryant, J. Cabrera, W. D. Cochran, S. Csizmadia, H. Deeg, O. Demangeon, M. Deleuil, X. Dumusque, P. Eigmüller, M. Endl, A. Erikson, F. Faedi, P. Figueira, A. Fukui, S. Grziwa, E. W. Guenther, D. Hidalgo, M. Hjorth, T. Hirano, S. Hojjatpanah, E. Knudstrup, J. Korth, K. W.F. Lam, J. De Leon, M. N. Lund, R. Luque, S. Mathur, P. Montañés Rodríguez, N. Narita, D. Nespral, P. Niraula, G. Nowak, H. P. Osborn, E. Pallé, M. Pätzold, D. Pollacco, J. Prieto-Arranz, H. Rauer, S. Redfield, I. Ribas, S. G. Sousa, A. M.S. Smith, M. Tala-Pinto, S. Udry, J. N. Winn

Astrophysical Sciences

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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 HD 219666 (M_∗ = 0.92 ± 0.03 M_⊙, R_∗ = 1.03 ± 0.03 R_⊙, τ_∗ = 10 ± 2 Gyr). With a mass of M_b = 16.6 ± 1.3 M_⊙, a radius of R_b = 4.71 ± 0.17 R_⊙, and an orbital period of P_orb ≃ 6 days, HD 219666 b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD 219666 (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 the High Accuracy Radial velocity Planet Searcher (HARPS) at ESO 3.6 m. We used the co-added HARPS spectrum to derive the host star fundamental parameters (T_eff = 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 atmosphericmetal-to-hydrogen content and thermal structure could provide us with important clues on the formation mechanisms of this class of objects.

Original language	English (US)
Article number	A165
Journal	Astronomy and Astrophysics
Volume	623
DOIs	https://doi.org/10.1051/0004-6361/201834853
State	Published - Mar 1 2019

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Planets and satellites: detection
Planets and satellites: fundamental parameters
Planets and satellites: individual: HD 219666 b
Stars: fundamental parameters
Techniques: photometric
Techniques: radial velocities

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10.1051/0004-6361/201834853

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Esposito, M., Armstrong, D. J., Gandolfi, D., Adibekyan, V., Fridlund, M., Santos, N. C., Livingston, J. H., Delgado Mena, E., Fossati, L., Lillo-Box, J., Barragán, O., Barrado, D., Cubillos, P. E., Cooke, B., Justesen, A. B., Meru, F., Díaz, R. F., Dai, F., Nielsen, L. D., ... Winn, J. N. (2019). HD 219666 b: a hot-Neptune from TESS Sector 1. Astronomy and Astrophysics, 623, Article A165. https://doi.org/10.1051/0004-6361/201834853

@article{6058f724f0a04fcf88c3ad497e1d456b,

title = "HD 219666 b: a hot-Neptune from TESS Sector 1",

abstract = "We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M∗ = 0.92 ± 0.03 M⊙, R∗ = 1.03 ± 0.03 R⊙, τ∗ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M⊙, a radius of Rb = 4.71 ± 0.17 R⊙, and an orbital period of Porb ≃ 6 days, HD 219666 b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD 219666 (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 the High Accuracy Radial velocity Planet Searcher (HARPS) at ESO 3.6 m. 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 atmosphericmetal-to-hydrogen content and thermal structure could provide us with important clues on the formation mechanisms of this class of objects.",

keywords = "Planets and satellites: detection, Planets and satellites: fundamental parameters, Planets and satellites: individual: HD 219666 b, Stars: fundamental parameters, Techniques: photometric, Techniques: radial velocities",

author = "M. Esposito and Armstrong, {D. J.} and D. Gandolfi and V. Adibekyan and M. Fridlund and Santos, {N. C.} and Livingston, {J. H.} and {Delgado Mena}, E. and L. Fossati and J. Lillo-Box and O. Barrag{\'a}n and D. Barrado and Cubillos, {P. E.} and B. Cooke and Justesen, {A. B.} and F. Meru and D{\'i}az, {R. F.} and F. Dai and Nielsen, {L. D.} and Persson, {C. M.} and Wheatley, {P. J.} and Hatzes, {A. P.} and {Van Eylen}, V. and Musso, {M. M.} and R. Alonso and Beck, {P. G.} and Barros, {S. C.C.} and D. Bayliss and Bonomo, {A. S.} and F. Bouchy and Brown, {D. J.A.} and E. Bryant and J. Cabrera and Cochran, {W. D.} and S. Csizmadia and H. Deeg and O. Demangeon and M. Deleuil and X. Dumusque and P. Eigm{\"u}ller and M. Endl and A. Erikson and F. Faedi and P. Figueira and A. Fukui and S. Grziwa and Guenther, {E. W.} and D. Hidalgo and M. Hjorth and T. Hirano and S. Hojjatpanah and E. Knudstrup and J. Korth and Lam, {K. W.F.} and {De Leon}, J. and Lund, {M. N.} and R. Luque and S. Mathur and {Monta{\~n}{\'e}s Rodr{\'i}guez}, P. and N. Narita and D. Nespral and P. Niraula and G. Nowak and Osborn, {H. P.} and E. Pall{\'e} and M. P{\"a}tzold and D. Pollacco and J. Prieto-Arranz and H. Rauer and S. Redfield and I. Ribas and Sousa, {S. G.} and Smith, {A. M.S.} and M. Tala-Pinto and S. Udry and Winn, {J. N.}",

note = "Publisher Copyright: {\textcopyright} ESO 2019.",

year = "2019",

month = mar,

day = "1",

doi = "10.1051/0004-6361/201834853",

language = "English (US)",

volume = "623",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Esposito, M, Armstrong, DJ, Gandolfi, D, Adibekyan, V, Fridlund, M, Santos, NC, Livingston, JH, Delgado Mena, E, Fossati, L, Lillo-Box, J, Barragán, O, Barrado, D, Cubillos, PE, Cooke, B, Justesen, AB, Meru, F, Díaz, RF, Dai, F, Nielsen, LD, Persson, CM, Wheatley, PJ, Hatzes, AP, Van Eylen, V, Musso, MM, Alonso, R, Beck, PG, Barros, SCC, Bayliss, D, Bonomo, AS, Bouchy, F, Brown, DJA, Bryant, E, Cabrera, J, Cochran, WD, Csizmadia, S, Deeg, H, Demangeon, O, Deleuil, M, Dumusque, X, Eigmüller, P, Endl, M, Erikson, A, Faedi, F, Figueira, P, Fukui, A, Grziwa, S, Guenther, EW, Hidalgo, D, Hjorth, M, Hirano, T, Hojjatpanah, S, Knudstrup, E, Korth, J, Lam, KWF, De Leon, J, Lund, MN, Luque, R, Mathur, S, Montañés Rodríguez, P, Narita, N, Nespral, D, Niraula, P, Nowak, G, Osborn, HP, Pallé, E, Pätzold, M, Pollacco, D, Prieto-Arranz, J, Rauer, H, Redfield, S, Ribas, I, Sousa, SG, Smith, AMS, Tala-Pinto, M, Udry, S & Winn, JN 2019, 'HD 219666 b: a hot-Neptune from TESS Sector 1', Astronomy and Astrophysics, vol. 623, A165. https://doi.org/10.1051/0004-6361/201834853

TY - JOUR

T1 - HD 219666 b

T2 - a hot-Neptune from TESS Sector 1

AU - Esposito, M.

AU - Armstrong, D. J.

AU - Gandolfi, D.

AU - Adibekyan, V.

AU - Fridlund, M.

AU - Santos, N. C.

AU - Livingston, J. H.

AU - Delgado Mena, E.

AU - Fossati, L.

AU - Lillo-Box, J.

AU - Barragán, O.

AU - Barrado, D.

AU - Cubillos, P. E.

AU - Cooke, B.

AU - Justesen, A. B.

AU - Meru, F.

AU - Díaz, R. F.

AU - Dai, F.

AU - Nielsen, L. D.

AU - Persson, C. M.

AU - Wheatley, P. J.

AU - Hatzes, A. P.

AU - Van Eylen, V.

AU - Musso, M. M.

AU - Alonso, R.

AU - Beck, P. G.

AU - Barros, S. C.C.

AU - Bayliss, D.

AU - Bonomo, A. S.

AU - Bouchy, F.

AU - Brown, D. J.A.

AU - Bryant, E.

AU - Cabrera, J.

AU - Cochran, W. D.

AU - Csizmadia, S.

AU - Deeg, H.

AU - Demangeon, O.

AU - Deleuil, M.

AU - Dumusque, X.

AU - Eigmüller, P.

AU - Endl, M.

AU - Erikson, A.

AU - Faedi, F.

AU - Figueira, P.

AU - Fukui, A.

AU - Grziwa, S.

AU - Guenther, E. W.

AU - Hidalgo, D.

AU - Hjorth, M.

AU - Hirano, T.

AU - Hojjatpanah, S.

AU - Knudstrup, E.

AU - Korth, J.

AU - Lam, K. W.F.

AU - De Leon, J.

AU - Lund, M. N.

AU - Luque, R.

AU - Mathur, S.

AU - Montañés Rodríguez, P.

AU - Narita, N.

AU - Nespral, D.

AU - Niraula, P.

AU - Nowak, G.

AU - Osborn, H. P.

AU - Pallé, E.

AU - Pätzold, M.

AU - Pollacco, D.

AU - Prieto-Arranz, J.

AU - Rauer, H.

AU - Redfield, S.

AU - Ribas, I.

AU - Sousa, S. G.

AU - Smith, A. M.S.

AU - Tala-Pinto, M.

AU - Udry, S.

AU - Winn, J. N.

PY - 2019/3/1

Y1 - 2019/3/1

N2 - We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M∗ = 0.92 ± 0.03 M⊙, R∗ = 1.03 ± 0.03 R⊙, τ∗ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M⊙, a radius of Rb = 4.71 ± 0.17 R⊙, and an orbital period of Porb ≃ 6 days, HD 219666 b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD 219666 (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 the High Accuracy Radial velocity Planet Searcher (HARPS) at ESO 3.6 m. 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 atmosphericmetal-to-hydrogen content and thermal structure could provide us with important clues on the formation mechanisms of this class of objects.

AB - We report on the confirmation and mass determination of a transiting planet orbiting the old and inactive G7 dwarf star HD 219666 (M∗ = 0.92 ± 0.03 M⊙, R∗ = 1.03 ± 0.03 R⊙, τ∗ = 10 ± 2 Gyr). With a mass of Mb = 16.6 ± 1.3 M⊙, a radius of Rb = 4.71 ± 0.17 R⊙, and an orbital period of Porb ≃ 6 days, HD 219666 b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD 219666 (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 the High Accuracy Radial velocity Planet Searcher (HARPS) at ESO 3.6 m. 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 atmosphericmetal-to-hydrogen content and thermal structure could provide us with important clues on the formation mechanisms of this class of objects.

KW - Planets and satellites: detection

KW - Planets and satellites: fundamental parameters

KW - Planets and satellites: individual: HD 219666 b

KW - Stars: fundamental parameters

KW - Techniques: photometric

KW - Techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85063896936&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063896936&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201834853

DO - 10.1051/0004-6361/201834853

M3 - Article

AN - SCOPUS:85063896936

SN - 0004-6361

VL - 623

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A165

ER -

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

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