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

MPS-Authors

Zechmeister,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dreizler,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ribas,  I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Reiners,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Caballero,  J. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bauer,  F. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Béjar,  V. J. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

González-Cuesta,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Herrero,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lalitha,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

López-González,  M. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Luque,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Morales,  J. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pallé,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodríguez,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodríguez López,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tal-Or,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Anglada-Escudé,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Quirrenbach,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Amado,  P. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Abril,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Aceituno,  F. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Aceituno,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Alonso-Floriano,  F. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ammler-von Eiff,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Antona Jiménez,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Anwand-Heerwart,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Arroyo-Torres,  B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Azzaro,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Baroch,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Barrado,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Becerril,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Benítez,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Berdiñas,  Z. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bergond,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bluhm,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brinkmöller,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

del Burgo,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Calvo Ortega,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cano,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cardona Guillén,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Carro,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cárdenas Vázquez,  M. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Casal,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Casasayas-Barris,  N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Casanova,  V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chaturvedi,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cifuentes,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Claret,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Colomé,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cortés-Contreras,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Czesla,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Díez-Alonso,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dorda,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fernández,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fernández-Martín,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fuhrmeister,  B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fukui,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Galadí-Enríquez,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gallardo Cava,  I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Garcia de la Fuente,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Garcia-Piquer,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

García Vargas,  M. L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gesa,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Góngora Rueda,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

González-Álvarez,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

González Hernández,  J. I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

González-Peinado,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Grözinger,  U.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guàrdia,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guijarro,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

de Guindos,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hatzes,  A. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hauschildt,  P. H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hedrosa,  R. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Helmling,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hermelo,  I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hernández Arabi,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hernández Castaño,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hernández Otero,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hintz,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Huke,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Huber,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jeffers,  S. V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Johnson,  E. N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

de Juan,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kaminski,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kemmer,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Klahr,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Klein,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Klüter,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Klutsch,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kossakowski,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kürster,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Labarga,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lafarga,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Llamas,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lampón,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lara,  L. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Launhardt,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lázaro,  F. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lodieu,  N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

López del Fresno,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

López-Puertas,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

López Salas,  J. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

López-Santiago,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Magán Madinabeitia,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mall,  U.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mancini,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mandel,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marfil,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marín Molina,  J. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Maroto Fernández,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martín,  E. L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martín-Fernández,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martín-Ruiz,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marvin,  C. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mirabet,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Montañés-Rodríguez,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Montes,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Moreno-Raya,  M. E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nagel,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Naranjo,  V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Narita,  N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nortmann,  L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nowak,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ofir,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Oshagh,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Panduro,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Parviainen,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pascual,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Passegger,  V. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pavlov,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pedraz,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pérez-Calpena,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pérez Medialdea,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Perger,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Perryman,  M. A. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rabaza,  O.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ramón Ballesta,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rebolo,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Redondo,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Reffert,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Reinhardt,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rhode,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rix,  H. -W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodler,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodríguez Trinidad,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rosich,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sadegi,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sánchez-Blanco,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sánchez Carrasco,  M. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sánchez-López,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sanz-Forcada,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sarkis,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sarmiento,  L. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schäfer,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schmitt,  J. H. M. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schöfer,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schweitzer,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Seifert,  W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shulyak,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Solano,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sota,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stahl,  O.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stock,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Strachan,  J. B. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stuber,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stürmer,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suárez,  J. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tabernero,  H. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tala Pinto,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Trifonov,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Veredas,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vico Linares,  J. I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vilardell,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wagner,  K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wolthoff,  V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Xu,  W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yan,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zapatero Osorio,  M. R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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Citation

Zechmeister, M., Dreizler, S., Ribas, I., Reiners, A., Caballero, J. A., Bauer, F. F., et al. (2019). The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star. Astronomy and Astrophysics, 627.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D1FC-3
Abstract
Context. Teegarden's Star is the brightest and one of the nearest ultra- cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0 V), 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 1.1 M 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. Tables D.1 and D.2 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/627/A49">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/627/A49</A>