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  The CARMENES search for exoplanets around M dwarfs: Spectroscopic orbits of nine M-dwarf multiple systems, including two triples, two brown dwarf candidates, and one close M-dwarf–white dwarf binary

Baroch, D., Morales, J. C., Ribas, I., Béjar, V. J. S., Reffert, S., Cardona Guillén, C., et al. (2021). The CARMENES search for exoplanets around M dwarfs: Spectroscopic orbits of nine M-dwarf multiple systems, including two triples, two brown dwarf candidates, and one close M-dwarf–white dwarf binary. Astronomy and Astrophysics, 653: A49. doi:10.1051/0004-6361/202141031.

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Baroch, D., Author
Morales, J. C., Author
Ribas, I., Author
Béjar, V. J. S., Author
Reffert, S., Author
Cardona Guillén, C. , Author
Reiners, A., Author
Caballero, J. A., Author
Quirrenbach, A., Author
Amado, P. J., Author
Anglada-Escudé, G., Author
Colomé, J., Author
Cortés-Contreras, M., Author
Dreizler, S., Author
Galadí-Enríquez, D., Author
Hatzes, A. P., Author
Jeffers, Sandra V.1, Author           
Henning, Th., Author
Herrero, E., Author
Kaminski, A., Author
Kürster, M., AuthorLafarga, M., AuthorLodieu, N., AuthorLópez-González, M. J., AuthorMontes, D., AuthorPallé, E., AuthorPerger, M., AuthorPollacco, D., AuthorRodríguez-López, C., AuthorRodríguez, E., AuthorRosich, A., AuthorSchöfer, P., AuthorSchweitzer, A., AuthorShan, Y., AuthorTal-Or, L., AuthorZechmeister, M., Author more..
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              


Free keywords: stars: low-mass / brown dwarfs / white dwarfs / binaries: spectroscopic / astrometry
 Abstract: Context. M dwarfs are ideal targets for the search of Earth-size planets in the habitable zone using the radial velocity method, and are attracting the attention of many ongoing surveys. One of the expected results of these surveys is that new multiple-star systems have also been found. This is the case also for the CARMENES survey, thanks to which nine new double-line spectroscopic binary systems have already been announced.

Aims. Throughout the five years of the survey the accumulation of new observations has resulted in the detection of several new multiple-stellar systems with long periods and low radial-velocity amplitudes. Here we newly characterise the spectroscopic orbits and constrain the masses of eight systems and update the properties of a system that we had reported earlier.

Methods. We derived the radial velocities of the stars using two-dimensional cross-correlation techniques and template matching. The measurements were modelled to determine the orbital parameters of the systems. We combined CARMENES spectroscopic observations with archival high-resolution spectra from other instruments to increase the time span of the observations and improve our analysis. When available, we also added archival photometric, astrometric, and adaptive optics imaging data to constrain the rotation periods and absolute masses of the components.

Results. We determined the spectroscopic orbits of nine multiple systems, eight of which are presented for the first time. The sample is composed of five single-line binaries, two double-line binaries, and two triple-line spectroscopic triple systems. The companions of two of the single-line binaries, GJ 3626 and GJ 912, have minimum masses below the stellar boundary, and thus could be brown dwarfs. We found a new white dwarf in a close binary orbit around the M star GJ 207.1, located at a distance of 15.79 pc. From a global fit to radial velocities and astrometric measurements, we were able to determine the absolute masses of the components of GJ 282 C, which is one of the youngest systems with measured dynamical masses.


Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -



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Source 1

Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 653 Sequence Number: A49 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1