A super-earth on a close-in orbit around the M1V star GJ 740: a HADES and CARMENES collaboration
<i>Context.<i/> M-dwarfs have proven to be ideal targets for planetary radial velocity (RV) searches due to their higher planet-star mass contrast, which favors the detection of low-mass planets. The abundance of super-Earth and Earth-like planets detected around this type of star motiva...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
10 February 2021
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| In: |
Astronomy and astrophysics
Year: 2021, Jahrgang: 648, Pages: 1-15 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202040099 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202040099 Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2021/04/aa40099-20/aa40099-20.html 
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| Verfasserangaben: | B. Toledo-Padrón, A. Suárez Mascareño, J.I. González Hernández, R. Rebolo, M. Pinamonti, M. Perger, G. Scandariato, M. Damasso, A. Sozzetti, J. Maldonado, S. Desidera, I. Ribas, G. Micela, L. Affer, E. González-Alvarez, G. Leto, I. Pagano, R. Zanmar Sánchez, P. Giacobbe, E. Herrero, J.C. Morales, P.J. Amado, J.A. Caballero, A. Quirrenbach, A. Reiners, and M. Zechmeister |
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| 100 | 1 | |a Toledo-Padrón, Borja |e VerfasserIn |0 (DE-588)1196227926 |0 (DE-627)1678042013 |4 aut | |
| 245 | 1 | 2 | |a A super-earth on a close-in orbit around the M1V star GJ 740 |b a HADES and CARMENES collaboration |c B. Toledo-Padrón, A. Suárez Mascareño, J.I. González Hernández, R. Rebolo, M. Pinamonti, M. Perger, G. Scandariato, M. Damasso, A. Sozzetti, J. Maldonado, S. Desidera, I. Ribas, G. Micela, L. Affer, E. González-Alvarez, G. Leto, I. Pagano, R. Zanmar Sánchez, P. Giacobbe, E. Herrero, J.C. Morales, P.J. Amado, J.A. Caballero, A. Quirrenbach, A. Reiners, and M. Zechmeister |
| 264 | 1 | |c 10 February 2021 | |
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| 520 | |a <i>Context.<i/> M-dwarfs have proven to be ideal targets for planetary radial velocity (RV) searches due to their higher planet-star mass contrast, which favors the detection of low-mass planets. The abundance of super-Earth and Earth-like planets detected around this type of star motivates further such research on hosts without reported planetary companions.<i>Aims.<i/> The HADES and CARMENES programs are aimed at carrying out extensive searches of exoplanetary systems around M-type stars in the northern hemisphere, allowing us to address, in a statistical sense, the properties of the planets orbiting these objects. In this work, we perform a spectroscopic and photometric study of one of the program stars (GJ 740), which exhibits a short-period RV signal that is compatible with a planetary companion.<i>Methods.<i/> We carried out a spectroscopic analysis based on 129 HARPS-N spectra taken over a time span of 6 yr combined with 57 HARPS spectra taken over 4 yr, as well as 32 CARMENES spectra taken during more than 1 yr, resulting in a dataset with a time coverage of 10 yr. We also relied on 459 measurements from the public ASAS survey with a time-coverage of 8 yr, along with 5 yr of photometric magnitudes from the EXORAP project taken in the <i>V<i/>, <i>B<i/>, <i>R<i/>, and <i>I<i/> filters to carry out a photometric study. Both analyses were made using Markov chain Monte Carlo simulations and Gaussian process regression to model the activity of the star.<i>Results.<i/> We present the discovery of a short-period super-Earth with an orbital period of 2.37756 d and a minimum mass of 2.96 <i>M<i/><sub>⊕<sub/>. We offer an update to the previously reported characterization of the magnetic cycle and rotation period of the star, obtaining values of <i>P<i/><sub>rot<sub/> = 35.563 ± 0.071 d and <i>P<i/><sub>cycle<sub/> = 2800 ± 150 d. Furthermore, the RV time series exhibits a possibly periodic long-term signal, which might be related to a Saturn-mass planet of ~100 <i>M<i/><sub>⊕<sub/>. | ||
| 700 | 1 | |a Mascareño, A. Suárez |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hernández, J. I. González |e VerfasserIn |4 aut | |
| 700 | 1 | |a Rebolo, R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Pinamonti, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Perger, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Scandariato, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Damasso, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sozzetti, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Maldonado, J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Desidera, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ribas, I. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Micela, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Affer, L. |e VerfasserIn |4 aut | |
| 700 | 1 | |a González-Alvarez, E. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Leto, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Pagano, I. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sánchez, R. Zanmar |e VerfasserIn |4 aut | |
| 700 | 1 | |a Giacobbe, P. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Herrero, E. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Morales, J. C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Amado, P. J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Caballero, J. A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Quirrenbach, Andreas |e VerfasserIn |0 (DE-588)112240623 |0 (DE-627)593634780 |0 (DE-576)304098167 |4 aut | |
| 700 | 1 | |a Reiners, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Zechmeister, M. |e VerfasserIn |4 aut | |
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