Bibcode
Trifonov, T.; Kürster, M.; Zechmeister, M.; Tal-Or, L.; Caballero, J. A.; Quirrenbach, A.; Amado, P. J.; Ribas, I.; Reiners, A.; Reffert, S.; Dreizler, S.; Hatzes, A. P.; Kaminski, A.; Launhardt, R.; Henning, Th.; Montes, D.; Béjar, V. J. S.; Mundt, R.; Pavlov, A.; Schmitt, J. H. M. M.; Seifert, W.; Morales, J. C.; Nowak, G.; Jeffers, S. V.; Rodríguez-López, C.; del Burgo, C.; Anglada-Escudé, G.; López-Santiago, J.; Mathar, R. J.; Ammler-von Eiff, M.; Guenther, E. W.; Barrado, D.; González Hernández, J. I.; Mancini, L.; Stürmer, J.; Abril, M.; Aceituno, J.; Alonso-Floriano, F. J.; Antona, R.; Anwand-Heerwart, H.; Arroyo-Torres, B.; Azzaro, M.; Baroch, D.; Bauer, F. F.; Becerril, S.; Benítez, D.; Berdiñas, Z. M.; Bergond, G.; Blümcke, M.; Brinkmöller, M.; Cano, J.; Cárdenas Vázquez, M. C.; Casal, E.; Cifuentes, C.; Claret, A.; Colomé, J.; Cortés-Contreras, M.; Czesla, S.; Díez-Alonso, E.; Feiz, C.; Fernández, M.; Ferro, I. M.; Fuhrmeister, B.; Galadí-Enríquez, D.; Garcia-Piquer, A.; García Vargas, M. L.; Gesa, L.; Gómez Galera, V.; González-Peinado, R.; Grözinger, U.; Grohnert, S.; Guàrdia, J.; Guijarro, A.; de Guindos, E.; Gutiérrez-Soto, J.; Hagen, H.-J.; Hauschildt, P. H.; Hedrosa, R. P.; Helmling, J.; Hermelo, I.; Hernández Arabí, R.; Hernández Castaño, L.; Hernández Hernando, F.; Herrero, E.; Huber, A.; Huke, P.; Johnson, E.; de Juan, E.; Kim, M.; Klein, R.; Klüter, J.; Klutsch, A.; Lafarga, M.; Lampón, M.; Lara, L. M.; Laun, W.; Lemke, U.; Lenzen, R.; López del Fresno, M.; López-González, M. J. et al.
Bibliographical reference
Astronomy and Astrophysics, Volume 609, id.A117, 24 pp.
Advertised on:
2
2018
Journal
Citations
120
Refereed citations
109
Description
Context. The main goal of the CARMENES survey is to find Earth-mass
planets around nearby M-dwarf stars. Seven M dwarfs included in the
CARMENES sample had been observed before with HIRES and HARPS and either
were reported to have one short period planetary companion (GJ 15 A, GJ
176, GJ 436, GJ 536 and GJ 1148) or are multiple planetary systems (GJ
581 and GJ 876). Aims: We aim to report new precise optical
radial velocity measurements for these planet hosts and test the overall
capabilities of CARMENES. Methods: We combined our CARMENES
precise Doppler measurements with those available from HIRES and HARPS
and derived new orbital parameters for the systems. Bona-fide single
planet systems were fitted with a Keplerian model. The multiple planet
systems were analyzed using a self-consistent dynamical model and their
best fit orbits were tested for long-term stability. Results: We
confirm or provide supportive arguments for planets around all the
investigated stars except for GJ 15 A, for which we find that the
post-discovery HIRES data and our CARMENES data do not show a signal at
11.4 days. Although we cannot confirm the super-Earth planet GJ 15 Ab,
we show evidence for a possible long-period (Pc =
7030-630+970 d) Saturn-mass (mcsini =
51.8M⊕) planet around GJ 15 A. In addition, based on
our CARMENES and HIRES data we discover a second planet around GJ 1148,
for which we estimate a period Pc = 532.6 days, eccentricity
ec = 0.342 and minimum mass mcsini =
68.1M⊕. Conclusions: The CARMENES optical radial
velocities have similar precision and overall scatter when compared to
the Doppler measurements conducted with HARPS and HIRES. We conclude
that CARMENES is an instrument that is up to the challenge of
discovering rocky planets around low-mass stars.
Based on observations collected at the European Organisation for
Astronomical Research in the Southern Hemisphere under ESO programmes
072.C-0488, 072.C-0513, 074.C-0012, 074.C-0364, 075.D-0614, 076.C-0878,
077.C-0364, 077.C-0530, 078.C-0044, 078.C-0833, 079.C-0681, 183.C-0437,
60.A-9036, 082.C-0718, 183.C-0972, 085.C-0019, 087.C-0831, 191.C-0873.
The appendix tables are only available at the CDS via anonymous ftp to
http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/609/A117
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