The CARMENES search for exoplanets around M dwarfs: benchmarking the impact of activity in high-precision radial velocity measurements
<i>Context.<i/> Current exoplanet surveys using the radial velocity (RV) technique are targeting M dwarfs because any habitable zone terrestrial-mass planets will induce a high RV and orbit on shorter periods than for more massive stars. One of the main caveats is that M dwarfs show a wi...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
8 July 2022
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| In: |
Astronomy and astrophysics
Year: 2022, Jahrgang: 663, Pages: 1-28 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202141880 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202141880 Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2022/07/aa41880-21/aa41880-21.html 
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| Verfasserangaben: | S.V. Jeffers, J.R. Barnes, P. Schöfer, A. Quirrenbach, M. Zechmeister, P.J. Amado, J.A. Caballero, M. Fernández, E. Rodríguez, I. Ribas, A. Reiners, C. Cardona Guillén, C. Cifuentes, S. Czesla, A.P. Hatzes, M. Kürster, D. Montes, J.C. Morales, S. Pedraz, and S. Sadegi |
MARC
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| 100 | 1 | |a Jeffers, Sandra |e VerfasserIn |0 (DE-588)1205763252 |0 (DE-627)1691405213 |4 aut | |
| 245 | 1 | 4 | |a The CARMENES search for exoplanets around M dwarfs |b benchmarking the impact of activity in high-precision radial velocity measurements |c S.V. Jeffers, J.R. Barnes, P. Schöfer, A. Quirrenbach, M. Zechmeister, P.J. Amado, J.A. Caballero, M. Fernández, E. Rodríguez, I. Ribas, A. Reiners, C. Cardona Guillén, C. Cifuentes, S. Czesla, A.P. Hatzes, M. Kürster, D. Montes, J.C. Morales, S. Pedraz, and S. Sadegi |
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| 520 | |a <i>Context.<i/> Current exoplanet surveys using the radial velocity (RV) technique are targeting M dwarfs because any habitable zone terrestrial-mass planets will induce a high RV and orbit on shorter periods than for more massive stars. One of the main caveats is that M dwarfs show a wide range of activity levels from inactive to very active, which can induce an asymmetry in the line profiles and, consequently, a spurious RV measurement.<i>Aims.<i/> We aim to benchmark the impact of stellar activity on high-precision RV measurements using regular-cadence CARMENES visible and near-infrared observations of the active M3.5 dwarf EV Lac.<i>Methods.<i/> We used the newly developed technique of low-resolution Doppler imaging to determine the centre-of-light, or spot-induced RV component, for eight observational epochs.<i>Results.<i/> We confirm a statistically significant and strong correlation between the independently measured centre-of-light and the chromatic index, which is a measure of the amplitude variation with wavelength of the RVs. We also find circular “closed-loop” relations of several activity indices with RV for a subset of data that covers only several rotation periods. We also investigate the implications of large phase gaps in the periodograms of activity indicators. Finally, by removing the spot-induced RV component we improve the planet-mass sensitivity by a factor of at least three.<i>Conclusions.<i/> We conclude that for active M stars, a regular-cadence observing strategy is the most efficient way to identify and eliminate sources of correlated noise. | ||
| 700 | 1 | |a Barnes, J. R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Schöfer, P. |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 Zechmeister, M. |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 Fernández, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Rodríguez, E. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ribas, I. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Reiners, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Guillén, C. Cardona |e VerfasserIn |4 aut | |
| 700 | 1 | |a Cifuentes, C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Czesla, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hatzes, A. P. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kürster, Martin |d 1957- |e VerfasserIn |0 (DE-588)172200075 |0 (DE-627)697113655 |0 (DE-576)133070166 |4 aut | |
| 700 | 1 | |a Montes, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Morales, J. C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Pedraz, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sadegi, S. |e VerfasserIn |4 aut | |
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