GJ 724 and GJ 3988 RV timeseries [Dataset]
We report the discovery of two exoplanets around the M dwarfs GJ 724 and GJ 3988 using the radial velocity (RV) method. We obtained a total of 153 3.5m Calar Alto/CARMENES spectra for both targets and measured their RVs and activity indicators. We also added archival ESO/HARPS data for GJ 724 and in...
| Autores: | , , , , , |
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| Tipo de recurso: | conjunto de datos |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/365483 |
| Acceso en línea: | http://hdl.handle.net/10261/365483 https://ui.adsabs.harvard.edu/abs/2023A&A...680A..28G https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/680/A28 |
| Access Level: | acceso abierto |
| Palabra clave: | https://cdsarc.cds.unistra.fr/vizier/catstd/ADCkwds.htx Stars, late-type Stars, M-type Exoplanets Radial velocities Optical |
| Sumario: | We report the discovery of two exoplanets around the M dwarfs GJ 724 and GJ 3988 using the radial velocity (RV) method. We obtained a total of 153 3.5m Calar Alto/CARMENES spectra for both targets and measured their RVs and activity indicators. We also added archival ESO/HARPS data for GJ 724 and infrared RV measurements from Subaru/IRD for GJ 3988. We searched for periodic and stable signals to subsequently construct Keplerian models, considering different numbers of planets, and we selected the best models based on their Bayesian evidence. Gaussian process (GP) regression was included in some models to account for activity signals. For both systems, the best model corresponds to one single planet. The minimum masses are 10.75^+0.96^_-0.87_ and 3.69^+0.42^_-0.41^ Earth-masses for GJ 724 b and GJ 3988 b, respectively. Both planets have short periods (P<10d) and, therefore, they orbit their star closely (a<0.05au). GJ 724 b has an eccentric orbit (e=0.577^+0.055^_-0.052_), whereas the orbit of GJ 3988 b is circular. The high eccentricity of GJ 724 b makes it the most eccentric single exoplanet (to this date) around an M dwarf. Thus, we suggest a further analysis to understand its configuration in the context of planetary formation and architecture. In contrast, GJ 3988 b is an example of a common type of planet around mid-M dwarfs. |
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