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Astudillo-Defru, N.; Díaz, R.F.; Bonfils, X.; Almenara, J.M.; Delisle, J.-B.; Bouchy, F.; Delfosse, X.; Forveille, T.; Lovis, C.; Mayor, M.; Murgas, F.; Pepe, F.; Santos, N.C.; Ségransan, D.; Udry, S.; Wünsche, A. "The HARPS search for southern extra-solar planets: XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti" (2017) Astronomy and Astrophysics. 605
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Abstract:

Exoplanet surveys have shown that systems with multiple low-mass planets on compact orbits are common. Except for a few cases, however, the masses of these planets are generally unknown. At the very end of the main sequence, host stars have the lowest mass and hence offer the largest reflect motion for a given planet. In this context, we monitored the low-mass (0.13 M Ȯ ) M dwarf YZ Cet (GJ 54.1, HIP 5643) intensively and obtained radial velocities and stellar-activity indicators derived from spectroscopy and photometry, respectively. We find strong evidence that it is orbited by at least three planets in compact orbits (P Orb = 1.97, 3.06, 4.66 days), with the inner two near a 2:3 mean-motion resonance. The minimum masses are comparable to the mass of Earth (M sin i = 0.75 ± 0.13, 0.98 ± 0.14, and 1.14 ± 0.17 M O± ), and they are also the lowest masses measured by radial velocity so far. We note the possibility for a fourth planet with an even lower mass of M sin i = 0.472 ± 0.096 M O± at P Orb = 1.04 days. An n-body dynamical model is used to place further constraints on the system parameters. At 3.6 parsecs, YZ Cet is the nearest multi-planet system detected to date. © ESO, 2017.

Registro:

Documento: Artículo
Título:The HARPS search for southern extra-solar planets: XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti
Autor:Astudillo-Defru, N.; Díaz, R.F.; Bonfils, X.; Almenara, J.M.; Delisle, J.-B.; Bouchy, F.; Delfosse, X.; Forveille, T.; Lovis, C.; Mayor, M.; Murgas, F.; Pepe, F.; Santos, N.C.; Ségransan, D.; Udry, S.; Wünsche, A.
Filiación:Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, Sauverny, 1290, Switzerland
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, EGA Buenos Aires, C1428, Argentina
CONICET, Universidad de Buenos Aires, Instituto de Astronomía y Física Del Espacio (IAFE), Buenos Aires, 1428, Argentina
Univ. Grenoble Alpes, CNRS, IPAG, Grenoble, 38000, France
Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, CAUP, Rua das Estrelas, Porto, 4150-762, Portugal
Departamento de Física e Astronomia, Faculdade de Ciências, Universidade Do Porto, Porto, 4099. 002, Portugal
Instituto de Astrofísica de Canarias, Vía Láctea s/n, La Laguna, Tenerife, 38205, Spain
Palabras clave:Planetary systems; Stars: individual: YZ Cet; Stars: late-type; Techniques: radial velocities; Extrasolar planets; Planets; Stars; Dynamical model; Mean motion resonances; Minimum mass; Planetary system; Radial velocity; Stars: individual; Stars:late type; Techniques: radial velocities; Orbits
Año:2017
Volumen:605
DOI: http://dx.doi.org/10.1051/0004-6361/201731581
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v605_n_p_AstudilloDefru

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Citas:

---------- APA ----------
Astudillo-Defru, N., Díaz, R.F., Bonfils, X., Almenara, J.M., Delisle, J.-B., Bouchy, F., Delfosse, X.,..., Wünsche, A. (2017) . The HARPS search for southern extra-solar planets: XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti. Astronomy and Astrophysics, 605.
http://dx.doi.org/10.1051/0004-6361/201731581
---------- CHICAGO ----------
Astudillo-Defru, N., Díaz, R.F., Bonfils, X., Almenara, J.M., Delisle, J.-B., Bouchy, F., et al. "The HARPS search for southern extra-solar planets: XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti" . Astronomy and Astrophysics 605 (2017).
http://dx.doi.org/10.1051/0004-6361/201731581
---------- MLA ----------
Astudillo-Defru, N., Díaz, R.F., Bonfils, X., Almenara, J.M., Delisle, J.-B., Bouchy, F., et al. "The HARPS search for southern extra-solar planets: XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti" . Astronomy and Astrophysics, vol. 605, 2017.
http://dx.doi.org/10.1051/0004-6361/201731581
---------- VANCOUVER ----------
Astudillo-Defru, N., Díaz, R.F., Bonfils, X., Almenara, J.M., Delisle, J.-B., Bouchy, F., et al. The HARPS search for southern extra-solar planets: XLII. A system of Earth-mass planets around the nearby M dwarf YZ Ceti. Astron. Astrophys. 2017;605.
http://dx.doi.org/10.1051/0004-6361/201731581