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The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star

Status Report From: arXiv.org e-Print archive
Posted: Tuesday, June 18, 2019

M. Zechmeister, S. Dreizler, I. Ribas, A. Reiners, J. A. Caballero, F. F. Bauer, V. J. S. Béjar, L. González-Cuesta, E. Herrero, S. Lalitha, M. J. López-González, R. Luque, J. C. Morales, E. Pallé, E. Rodríguez, C. Rodríguez López, L. Tal-Or, G. Anglada-Escudé, A. Quirrenbach, P. J. Amado, M. Abril, F. J. Aceituno, J. Aceituno, F. J. Alonso-Floriano, M. Ammler-von Eiff, R. Antona Jiménez, H. Anwand-Heerwart, B. Arroyo-Torres, M. Azzaro, D. Baroch, D. Barrado, S. Becerril, D. Benítez, Z. M. Berdiñas, G. Bergond, P. Bluhm, M. Brinkmöller, C. del Burgo, R. Calvo Ortega, J. Cano, C. Cardona Guillén, J. Carro, M. C. Cárdenas Vázquez, E. Casal, N. Casasayas-Barris, V. Casanova, P. Chaturvedi, C. Cifuentes, A. Claret, J. Colomé, M. Cortés-Contreras, S. Czesla, E. Díez-Alonso, R. Dorda, M. Fernández, A. Fernández-Martín, B. Fuhrmeister, A. Fukui, D. Galadí-Enríquez, I. Gallardo Cava, J. Garcia de la Fuente, A. Garcia-Piquer, M. L. García Vargas, L. Gesa, J. Góngora Rueda, E. González-Álvarez, J. I. González Hernández, R. González-Peinado, U. Grözinger, J. Guàrdia, A. Guijarro, E. de Guindos, A. P. Hatzes, P. H. Hauschildt, R. P. Hedrosa, J. Helmling, T. Henning, I. Hermelo, R. Hernández Arabi, L. Hernández Castaño, F. Hernández Otero, D. Hintz, P. Huke, A. Huber, S. V. Jeffers, E. N. Johnson, E. de Juan, A. Kaminski, J. Kemmer, M. Kim, H. Klahr, R. Klein, J. Klüter, A. Klutsch, D. Kossakowski, M. Kürster, F. Labarga, M. Lafarga, M. Llamas, M. Lampón et al. (83 additional authors not shown)

(Submitted on 17 Jun 2019)

Context. Teegarden's Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0V), the star shows relatively little activity and is a prime target for near-infrared radial velocity surveys such as CARMENES. 

Aims. As part of the CARMENES search for exoplanets around M dwarfs, we obtained more than 200 radial-velocity measurements of Teegarden's Star and analysed them for planetary signals. 

Methods. We find periodic variability in the radial velocities of Teegarden's Star. We also studied photometric measurements to rule out stellar brightness variations mimicking planetary signals. 

Results. We find evidence for two planet candidates, each with 1.1M⊕ minimum mass, orbiting at periods of 4.91 and 11.4 d, respectively. No evidence for planetary transits could be found in archival and follow-up photometry. Small photometric variability is suggestive of slow rotation and old age. 

Conclusions. The two planets are among the lowest-mass planets discovered so far, and they are the first Earth-mass planets around an ultra-cool dwarf for which the masses have been determined using radial velocities.

Comments: A&A in press, 26 pages, 17 figures, 6 tables. Press release material available at this http URL

Subjects: Earth and Planetary Astrophysics (astro-ph.EP)

DOI: 10.1051/0004-6361/201935460

Cite as: arXiv:1906.07196 [astro-ph.EP] (or arXiv:1906.07196v1 [astro-ph.EP] for this version)

Submission history

From: Mathias Zechmeister 

[v1] Mon, 17 Jun 2019 18:00:06 UTC (3,218 KB)

https://arxiv.org/abs/1906.07196

Astrobiology

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