Universität zu Köln

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., Barragan, O., Barrado, D., Cubillos, P. E., Cooke, B., Justesen, A. B., Meru, F., Diaz, R. F., Dai, E., Nielsen, L. D., Persson, C. M., Wheatley, P. J., Hatzes, A. P., Van Eylen, V., Musso, M. M., Alonso, R., Beck, P. G., Barros, S. C. C., Bayliss, D., Bonomo, A. S., Bouchy, F., Brown, D. J. A., Bryant, E., Cabrera, J., Cochran, W. D., Csizmadia, S., Deeg, H., Demangeon, O., Deleuil, M., Dumusque, X., Eigmuller, P., Endl, M., Erikson, A., Faedi, F., Figueira, P., Fukui, A., Grziwa, S., Guenther, E. W., Hidalgo, D., Hjorth, M., Hirano, T., Hojjatpanah, S., Knudstrup, E., Korth, J., Lam, K. W. F., de Leon, J., Lund, M. N., Luque, R., Mathur, S., Montanes Rodriguez, P., Narita, N., Nespral, D., Niraula, P., Nowak, G., Osborn, H. P., Palle, E., Paetzold, M., Pollacco, D., Prieto-Arranz, J., Rauer, H., Redfield, S., Ribas, I, Sousa, S. G., Smith, A. M. S., Tala-Pinto, M., Udry, S. and Winn, J. N. (2019). HD 219666 b: a hot-Neptune from TESS Sector 1. Astron. Astrophys., 623. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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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 (M-star = 0.92 +/- 0.03 M-circle dot, R-star = 1.03 +/- 0.03 R-circle dot, tau(star) = 10 +/- 2 Gyr). With a mass of M-b = 16.6 +/- 1.3 M-circle plus, a radius of R-b = 4.71 +/- 0.17 R-circle plus, and an orbital period of P-orb similar or equal to 6 days, HD219666 b 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 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(star) = 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
Creators:	Creators Email ORCID ORCID Put Code Esposito, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Armstrong, D. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gandolfi, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Adibekyan, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Fridlund, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Santos, N. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Livingston, J. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Delgado Mena, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fossati, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lillo-Box, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barragan, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barrado, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cubillos, P. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cooke, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Justesen, A. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meru, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Diaz, R. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dai, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nielsen, L. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Persson, C. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wheatley, P. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hatzes, A. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Van Eylen, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Musso, M. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Alonso, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beck, P. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barros, S. C. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bayliss, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonomo, A. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bouchy, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brown, D. J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bryant, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cabrera, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cochran, W. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Csizmadia, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Deeg, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Demangeon, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Deleuil, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dumusque, X. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eigmuller, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endl, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Erikson, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Faedi, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Figueira, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fukui, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grziwa, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guenther, E. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hidalgo, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hjorth, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hirano, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hojjatpanah, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knudstrup, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korth, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lam, K. W. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED de Leon, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lund, M. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luque, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Montanes Rodriguez, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Narita, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nespral, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Niraula, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nowak, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Osborn, H. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palle, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paetzold, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pollacco, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Prieto-Arranz, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rauer, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Redfield, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ribas, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Sousa, S. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, A. M. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tala-Pinto, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Udry, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Winn, J. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-153293
DOI:	10.1051/0004-6361/201834853
Journal or Publication Title:	Astron. Astrophys.
Volume:	623
Date:	2019
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COLLISION-INDUCED ABSORPTION; INDUCED INFRARED-SPECTRA; H-2-HE PAIRS; RADIAL-VELOCITY; SUPER-EARTHS; LINE LISTS; TEMPERATURES; EXOPLANET; COOL; MASS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15329