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

Damasso, M.; Esposito, M.; Nascimbeni, V.; Desidera, S.; Bonomo, A.S.; Bieryla, A.; Malavolta, L.; Biazzo, K.; Sozzetti, A.; Covino, E.; Latham, D.W.; Gandolfi, D.; Rainer, M.; Petrovich, C.; Collins, K.A.; Boccato, C.; Claudi, R.U.; Cosentino, R.; Gratton, R.; Lanza, A.F.; 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, L.R.; Benatti, S.; Borsa, F.; Maldonado, J.; Mancini, L.; Scandariato, G.; Southworth, J.; Zanmar Sanchez, R.

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


Authors

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

R. Zanmar Sanchez



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 ? = -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.

Citation

Damasso, M., Esposito, M., Nascimbeni, V., Desidera, S., Bonomo, A., Bieryla, A., …Zanmar Sanchez, R. (2015). The GAPS programme with HARPS-N at TNG IX. The multi-planet system KELT-6: Detection of the planet KELT-6 c and measurement of the Rossiter-McLaughlin effect for KELT-6 b. Astronomy & Astrophysics, 581, Article L6. https://doi.org/10.1051/0004-6361/201526995

Journal Article Type Article
Acceptance Date Aug 25, 2015
Online Publication Date Sep 16, 2015
Publication Date 2015-09
Journal Astronomy & Astrophysics
Print ISSN 0004-6361
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 581
Article Number L6
DOI https://doi.org/10.1051/0004-6361/201526995
Keywords stars, KELT-6, planetary systems, radial velocities, photometric, astrophysics
Publisher URL http://dx.doi.org/10.1051/0004-6361/201526995

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