<BR /> Aims: For more than 1.5 years we spectroscopically monitored the star KELT-6 (BD+31 2447), which is known to host the transiting hot-Saturn KELT-6 b, because a previously observed long-term trend in radial velocity time series suggested that there is an outer companion. <BR /> Methods: We collected a total of 93 new spectra with the HARPS-N and TRES spectrographs. A spectroscopic transit of KELT-6 b was observed with HARPS-N, and simultaneous photometry was obtained with the IAC-80 telescope. <BR /> Results: We proved the existence of an outer planet with a mininum mass M<SUB>p</SUB>sin i = 3.71 ± 0.21 M<SUB>Jup</SUB> and a moderately eccentric orbit (e = 0.21<SUB>-0.036</SUB><SUP>+0.039</SUP>) of period P ~ 3.5 years. We improved the orbital solution of KELT-6 b 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 of λ = -36 ± 11 degrees. We improved the KELT-6 b transit ephemeris from photometry and provide new measurements of the stellar parameters. KELT-6 appears as an interesting case for studying the formation and evolution of multi-planet systems. Based on observations made with (i) the HARPS-N spectrograph on the Italian Telescopio Nazionale Galileo (TNG), operated on the island of La Palma by the INAF - Fundacion Galileo Galilei (Spanish Observatory of Roque de los Muchachos of the IAC); (ii) the Tillinghast Reflector Echelle Spectrograph (TRES) on the 1.5-m Tillinghast telescope, located at the Smithsonian Astrophysical Observatory's Fred L. Whipple Observatory on Mt. Hopkins in Arizona; (iii) the IAC-80 telescope at the Teide Observatory (Instituto de Astrofísica de Canarias, IAC).Figure 4 and Tables 2 and 3 are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201526995/olm">http://www.aanda.org</A>

Damasso, M., Esposito, M., Nascimbeni, V., Desidera, S., Bonomo, A.s., Bieryla, A., et al. (2015). The GAPS programme with HARPS-N at TNG: IX. The multi-planet system KELT-6: Detection of the planet KELT-6c and measurement of the Rossiter-McLaughlin effect for KELT-6 b. ASTRONOMY & ASTROPHYSICS, 581, L6 [10.1051/0004-6361/201526995].

The GAPS programme with HARPS-N at TNG: IX. The multi-planet system KELT-6: Detection of the planet KELT-6c and measurement of the Rossiter-McLaughlin effect for KELT-6 b

Covino E.;Molinari E.;Mancini L.;
2015-01-01

Abstract


Aims: For more than 1.5 years we spectroscopically monitored the star KELT-6 (BD+31 2447), which is known to host the transiting hot-Saturn KELT-6 b, because a previously observed long-term trend in radial velocity time series suggested that there is an outer companion.
Methods: We collected a total of 93 new spectra with the HARPS-N and TRES spectrographs. A spectroscopic transit of KELT-6 b 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 Mpsin i = 3.71 ± 0.21 MJup and a moderately eccentric orbit (e = 0.21-0.036+0.039) of period P ~ 3.5 years. We improved the orbital solution of KELT-6 b 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 of λ = -36 ± 11 degrees. We improved the KELT-6 b transit ephemeris from photometry and provide new measurements of the stellar parameters. KELT-6 appears as an interesting case for studying the formation and evolution of multi-planet systems. Based on observations made with (i) the HARPS-N spectrograph on the Italian Telescopio Nazionale Galileo (TNG), operated on the island of La Palma by the INAF - Fundacion Galileo Galilei (Spanish Observatory of Roque de los Muchachos of the IAC); (ii) the Tillinghast Reflector Echelle Spectrograph (TRES) on the 1.5-m Tillinghast telescope, located at the Smithsonian Astrophysical Observatory's Fred L. Whipple Observatory on Mt. Hopkins in Arizona; (iii) the IAC-80 telescope at the Teide Observatory (Instituto de Astrofísica de Canarias, IAC).Figure 4 and Tables 2 and 3 are available in electronic form at http://www.aanda.org
2015
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Damasso, M., Esposito, M., Nascimbeni, V., Desidera, S., Bonomo, A.s., Bieryla, A., et al. (2015). The GAPS programme with HARPS-N at TNG: IX. The multi-planet system KELT-6: Detection of the planet KELT-6c and measurement of the Rossiter-McLaughlin effect for KELT-6 b. ASTRONOMY & ASTROPHYSICS, 581, L6 [10.1051/0004-6361/201526995].
Damasso, M; Esposito, M; Nascimbeni, V; Desidera, S; Bonomo, As; Bieryla, A; Malavolta, L; Biazzo, K; Sozzetti, A; Covino, E; Latham, Dw; Gandolfi, D; Rainer, M; Petrovich, C; Collins, Ka; Boccato, C; Claudi, Ru; Cosentino, R; Gratton, R; Lanza, Af; Maggio, A; Micela, G; Molinari, E; Pagano, I; Piotto, G; Poretti, E; Smareglia, R; Di Fabrizio, L; Giacobbe, P; Gomez-Jimenez, M; Murabito, S; Molinaro, M; Affer, L; Barbieri, M; Bedin, Lr; Benatti, S; Borsa, F; Maldonado, J; Mancini, L; Scandariato, G; Southworth, J; Zanmar Sanchez, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/204731
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