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25 April 2024

» arxiv » 1508.6520

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The GAPS Programme with HARPS-N@TNG X. The multi-planet system KELT-6: detection of the planet KELT-6 c and measurement of the Rossiter-McLaughlin effect for KELT-6 b
M. Damasso ; M. Esposito ; V. Nascimbeni ; S. Desidera ; A.S. Bonomo ; A. Bieryla ; L. Malavolta ; K. Biazzo ; A. Sozzetti ; E. Covino ; D. W. Latham ; D. Gandolfi ; M. Rainer ; C. Petrovich ; K. A. Collins ; C. Boccato ; R.U. Claudi ; R. Cosentino ; R. Gratton ; A.F. Lanza ; A. Maggio ; G. Micela ; E. Molinari ; I. Pagano ; G. Piotto ; E. Poretti ; R. Smareglia ; L. Di Fabrizio ; P. Giacobbe ; M. Gomez-Jimenez ; S. Murabito ; M. Molinaro ; L. Affer ; M. Barbieri ; L. R. Bedin ; S. Benatti ; F. Borsa ; J. Maldonado ; L. Mancini ; G. Scandariato ; J. Southworth ; R. Zanmar Sanchez ;
Date:	26 Aug 2015
Abstract:	Aims. For more than 1.5 years we monitored spectroscopically the star KELT-6 (BD+312447), known to host the transiting hot Saturn KELT-6b, because a previously observed long-term trend in radial velocity time series suggested the existence of an outer companion. Methods. We collected a total of 93 new spectra with the HARPS-N and TRES spectrographs. A spectroscopic transit of KELT-6b was observed with HARPS-N, and simultaneous photometry was obtained with the IAC-80 telescope. Results. We proved the existence of an outer planet with a mininum mass M$_{ m p}$sini=3.71$pm$0.21 M$_{ m Jup}$ and a moderately eccentric orbit ($e=0.21_{-0.036}^{+0.039}$) of period P$sim$3.5 years. We improved the orbital solution of KELT-6b and obtained the first measurement of the Rossiter-McLaughlin effect, showing that the planet has a likely circular, prograde, and slightly misaligned orbit, with a projected spin-orbit angle $lambda$=$-$36$pm$11 degrees. We improved the KELT-6b transit ephemeris from photometry, and we provided new measurements of the stellar parameters. KELT-6 appears as an interesting case to study the formation and evolution of multi-planet systems.
Source:	arXiv, 1508.6520
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