Issue |
A&A
Volume 684, April 2024
|
|
---|---|---|
Article Number | A117 | |
Number of page(s) | 19 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202348033 | |
Published online | 11 April 2024 |
Teegarden’s Star revisited
A nearby planetary system with at least three planets★,★★
1
Institut für Astrophysik, Georg-August-Universität,
Friedrich-Hund-Platz 1,
37077
Göttingen, Germany
e-mail: dreizler@astro.physik.uni-goettingen.de
2
Department of Astronomy & Astrophysics, University of Chicago,
Chicago, IL
60637, USA
3
Instituto de Astrofísica de Andalucía (IAA-CSIC),
Glorieta de la Astronomía s/n,
18008
Granada, Spain
4
Institut de Ciències de l’Espai (ICE, CSIC),
Campus UAB, C/ Can Magrans s/n,
08193
Bellaterra, Spain
5
Institut d’Estudis Espacials de Catalunya,
C/ Gran Capità, 2–4,
08028
Barcelona, Spain
6
Astrobiology Research Unit, Université de Liège,
19C Allée du 6 Août,
4000
Liège, Belgium
7
Space Sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège,
Allée du 6 Août 19C,
4000
Liège, Belgium
8
Centro de Astrobiología (CSIC-INTA),
ESAC campus, Camino bajo del castillo s/n,
28692
Villanueva de la Cañada, Madrid, Spain
9
Instituto de Astrofísica de Canarias,
Av. Vía Láctea s/n,
38205
La Laguna, Tenerife, Spain
10
Departamento de Astrofísica, Universidad de La Laguna,
38206
La Laguna, Tenerife, Spain
11
Thüringer Landessternwarte Tautenburg,
Sternwarte 5,
07778
Tautenburg, Germany
12
Max-Planck-Institut für Astronomie,
Königstuhl 17,
69117
Heidelberg, Germany
13
Departamento de Física de la Tierra y Astrofísica and IPARCOS-UCM (Instituto de Física de Partículas y del Cosmos de la UCM), Facultad de Ciencias Físicas, Universidad Complutense de Madrid,
28040,
Madrid, Spain
14
Department of Astrophysical and Planetary Sciences, University of Colorado Boulder,
Boulder, CO
80309, USA
15
Landessternwarte, Zentrum für Astronomie der Universität Heidelberg,
Königstuhl 12,
69117
Heidelberg, Germany
16
Hamburger Sternwarte, Universität Hamburg,
Gojenbergsweg 112,
21029
Hamburg, Germany
17
Department of Astrophysical Sciences, Princeton University,
4 Ivy Lane,
Princeton, NJ
08540, USA
18
Centro Astronónomico Hispano en Andalucía, Observatorio de Calar Alto, Sierra de los Filabres,
04550
Gérgal, Almería, Spain
Received:
21
September
2023
Accepted:
15
January
2024
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⊕. 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.
Key words: methods: data analysis / planets and satellites: individual: Teegarden’s Star bc / stars: individual: Teegarden’s Star / stars: low-mass
Full Table A.1 is available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A117
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.