methods: data analysis; planets and satellites: individual:; Teegarden's Star bc; stars: individual: Teegarden's Star; stars: low-; mass; Astrophysics - Earth and Planetary Astrophysics; Astrophysics -; Solar and Stellar Astrophysics
Abstract :
[en] The two known planets in the planetary system of Teegarden's Star are among the most Earth-like exoplanets currently known. Revisiting this nearby planetary system with two planets in the habitable zone aims at a more complete census of planets around very low-mass stars. A significant number of new radial velocity measurements from CARMENES, ESPRESSO, MAROON-X, and HPF, as well as photometry from TESS motivated a deeper search for additional planets. We confirm and refine the orbital parameters of the two know planets Teegarden's Star b and c. We also report the detection of a third planet d with an orbital period of 26.13 ± 0.04 days and a minimum mass of 0.82 ± 0.17 M<SUB>⊕</SUB>. A signal at 96 days is attributed to the stellar rotation period. The interpretation of a signal at 172 days remains open. The TESS data exclude transiting short-period planets down to about half an Earth radius. We compare the planetary system architecture of very low-mass stars. In the currently known configuration, the planetary system of Teegarden's star is dynamically quite different from that of TRAPPIST-1, which is more compact, but dynamically similar to others such as GJ 1002. <P />Full Table A.1 is available at the CDS via anonymous ftp to <A href="https://cdsarc.cds.unistra.fr">cdsarc.cds.unistra.fr</A> (ftp://130.79.128.5) or via <A href="https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A117">https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A117</A> <P />Based on observations collected at the European Southern Observatory under ESO programme(s) 0103.C-0152(A).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Dreizler, S.; University of Gottingen, Institute for Astrophysics
Luque, R.; University of Chicago, Department of Astronomy and Astrophysics, Institute of Astrophysics of Andalusia
Ribas, I.; CSIC, Consejo Superior de Investigaciones Cientificas, Barcelona, -
Koseleva, V.; University of Gottingen, Institute for Astrophysics
Ruh, H. L.; University of Gottingen, Institute for Astrophysics
Nagel, E.; University of Gottingen, Institute for Astrophysics
Pozuelos, F. J.; Institute of Astrophysics of Andalusia, University of Liege, Belgium, University of Liege, Laboratory of Planetary and Atmospheric Physics
Zechmeister, M.; University of Gottingen, Institute for Astrophysics
Reiners, A.; University of Gottingen, Institute for Astrophysics
Caballero, J. A.; Center for Astrobiology, Madrid
Amado, P. J.; Institute of Astrophysics of Andalusia
Béjar, V. J. S.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Bean, J. L.; University of Chicago, Department of Astronomy and Astrophysics
Brady, M.; University of Chicago, Department of Astronomy and Astrophysics
Cifuentes, C.; Center for Astrobiology, Madrid
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Hatzes, A. P.; Thuringer Landessternwarte Tautenburg, Germany
Henning, Th.; Max-Planck-Institute for Astronomy, Heidelberg
Kasper, D.; University of Chicago, Department of Astronomy and Astrophysics
Montes, D.; Institute of Astronomy and Geophysics, Madrid
Morales, J. C.; CSIC, Consejo Superior de Investigaciones Cientificas, Barcelona, -
Murray, C. A.; University of Colorado, Boulder, Department of Astrophysical and Planetary Sciences
Pallé, E.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Quirrenbach, A.; University of Heidelberg, Astronomical Observatory
Seifahrt, A.; University of Chicago, Department of Astronomy and Astrophysics
Schweitzer, A.; University of Hamburg, Hamburg Observatory
Stürmer, J.; University of Heidelberg, Astronomical Observatory
Stefánsson, G.; Princeton University, Department of Astrophysical Sciences
Linares, J. I. Vico; Centro Astronónomico Hispano en Andalucía, Observatorio de Calar Alto, Sierra de los Filabres, 04550, Gérgal, Almería, Spain
SHERLOCK (Searching for Hints of Exoplanets fRom Lightcurves Of spaCe-based seeKers) code is fully available on GitHub: https://github.com/franpoz/SHERLOCK
The MATRIX (Multi-phAse Transits Recovery from Injected eXoplanets) code is open access on GitHub: https://github.com/PlanetHunters/tkmatrix
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