¡Nos trasladamos! E-Prints cerrará el 7 de junio.

En las próximas semanas vamos a migrar nuestro repositorio a una nueva plataforma con muchas funcionalidades nuevas. En esta migración las fechas clave del proceso son las siguientes:

Es muy importante que cualquier depósito se realice en E-Prints Complutense antes del 7 de junio. En caso de urgencia para realizar un depósito, se puede comunicar a docta@ucm.es.

The CARMENES search for exoplanets around M dwarfs: two Saturn-mass planets orbiting active stars



Downloads per month over past year

Montes Gutiérrez, David and Caballero, J. A. and otros, ... (2022) The CARMENES search for exoplanets around M dwarfs: two Saturn-mass planets orbiting active stars. Astronomy & Astrophysics, 663 . ISSN 0004-6361

[thumbnail of davidmontes147libre.pdf]

Official URL: http://dx.doi.org/10.1051/0004-6361/202142915


The CARMENES radial-velocity survey is currently searching for planets in a sample of 387 M dwarfs. Here we report on two Saturn-mass planets orbiting TYC 2187-512-1 (M_*) = 0.50 Mꙩ) and TZ Ari ((M_*) = 0.15 Mꙩ), respectively. We obtained supplementary photometric time series, which we use along with spectroscopic information to determine the rotation periods of the two stars. In both cases, the radial velocities also show strong modulations at the respective rotation period. We thus modeled the radial velocities as a Keplerian orbit plus a Gaussian process representing the stellar variability. TYC 2187-512-1 is found to harbor a planet with a minimum mass of 0.33 M_(Jup) in a near-circular 692-day orbit. The companion of TZ Ari has a minimum mass of 0.21 M_(Jup), orbital period of 771 d, and orbital eccentricity of 0.46. We provide an overview of all known giant planets in the CARMENES sample, from which we infer an occurrence rate of giant planets orbiting M dwarfs with periods up to 2 yr in the range between 2 and 6%. TZ Ari b is only the second giant planet discovered orbiting a host with mass less than 0.3 Mꙩ. These objects occupy an extreme location in the planet mass versus host mass plane. It is difficult to explain their formation in core-accretion scenarios, so they may possibly have been formed through a disk fragmentation process.

Item Type:Article
Additional Information:

© ESO 2022. Artículo firmado por 26 autores. CARMENES is an instrument for the Centro Astronómico Hispano-Alemán (CAHA) at Calar Alto (Almería, Spain), operated jointly by the Junta de Andalucía and the Instituto de Astrofísica de Andalucía (CSIC). CARMENES was funded by the Max-Planck-Gesellschaft (MPG), the Consejo Superior de Investigaciones Científicas (CSIC), the Ministerio de Economía y Competitividad (MINECO) and the European Regional Development Fund (ERDF) through projects FICTS-2011-02, ICTS-2017-07-CAHA-4, and CAHA16-CE-3978, and the members of the CARMENES Consortium (Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Andalucía, Landessternwarte Königstuhl, Institut de Ciències de l’Espai, Institut für Astrophysik Göttingen, Universidad Complutense de Madrid, Thüringer Landessternwarte Tautenburg, Instituto de Astrofísica de Canarias, Hamburger Sternwarte, Centro de Astrobiología and Centro Astronómico Hispano-Alemán), with additional contributions by the MINECO, the Deutsche Forschungsgemeinschaft through the Major Research Instrumentation Program and Research Unit FOR2544 “Blue Planets around Red Stars”, the Klaus Tschira Stiftung, the states of Baden-Württemberg and Niedersachsen, and by the Junta de Andalucía. We acknowledge financial support from NASA through grant NNX17AG24G. We acknowledge financial support from the Agencia Estatal de Investigación of the Ministerio de Ciencia, Innovación y Universidades through projects PID2019-110689RB-100, PID2019-109522GB-C5[1:4], PID2019-107061GB-C64 and the Centre of Excellence “Severo Ochoa”, Instituto de Astrofísica de Andalucía (SEV-2017-0709). We further acknowledge support by the BNSF program “VIHREN-2021” project No. KP-06-DB/5. Based on data from the CARMENES data archive at CAB (CSIC-INTA). Data were partly collected with the 150 and 90 cm telescopes at the Observatorio de Sierra Nevada (OSN) operated by the Instituto de Astrofísica de Andalucía (IAA-CSIC). This work makes use of observations from the Las Cumbres Observatory global telescope network. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. We thank the referee, Alexis Heitzmann, for his careful reading of the manuscript and his helpful comments.

Uncontrolled Keywords:Precise radial-velocites; Nearby M dwarfs; Giant planet; Rotation periods; Input catalog; H-alpha; Parameters; Jupiters; Systems; Sample
Subjects:Sciences > Physics > Astrophysics
ID Code:75297
Deposited On:17 Nov 2022 07:57
Last Modified:17 Nov 2022 11:03

Origin of downloads

Repository Staff Only: item control page