New HARPS and FEROS Observations of GJ 1046

Trifonov, T.; Kürster, M.; Reffert, S.; Zechmeister, M.; Endl, Michael; Rodler, F.; Barragán, Oscar; Henning, Thomas; Lee, Man Hoi; Zakhozhay, O. V.; Sarkis, P.; Heeren, Paul; Tala, M.; Wolthoff, V.; Brems, Stefan S.; Stock, S.; Hempel, A.; Kossakowski, D.

doi:10.3847/2515-5172/aae437

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Apart of the GJ 1148 and the GJ 876 M-dwarf planetary systems, there are some other peculiar exceptions; for example, GJ 1046 hosts a brown dwarf companion on 169-day period orbit (Kürster et al 2008;Trifonov et al 2018a), and there is an unexpected giant planet around the very low-mass M-dwarf star GJ 1132 (Morales et al 2019). The GJ 317 system also has a Jupiter-mass planet in orbit (Johnson et al 2007 are very likely accompanied by another long-period giant planet whose orbit has not yet been precisely determined.…”

Section: The Gj 1148 Planetary Systemmentioning

confidence: 99%

The CARMENES search for exoplanets around M dwarfs

Trifonov

Lee²,

Kürster

et al. 2020

A&A

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Context. GJ 1148 is an M-dwarf star hosting a planetary system composed of two Saturn-mass planets in eccentric orbits with periods of 41.38 and 532.02 days. Aims. We reanalyze the orbital configuration and dynamics of the GJ 1148 multi-planetary system based on new precise radial velocity (RV) measurements taken with CARMENES. Methods. We combined new and archival precise Doppler measurements from CARMENES with those available from HIRES for GJ 1148 and modeled these data with a self-consistent dynamical model. We studied the orbital dynamics of the system using the secular theory and direct N-body integrations. The prospects of potentially habitable moons around GJ 1148 b were examined. Results. The refined dynamical analyses show that the GJ 1148 system is long-term stable in a large phase-space of orbital parameters with an orbital configuration suggesting apsidal alignment, but not in any particular high-order mean-motion resonant commensurability. GJ 1148 b orbits inside the optimistic habitable zone (HZ). We find only a narrow stability region around the planet where exomoons can exist. However, in this stable region exomoons exhibit quick orbital decay due to tidal interaction with the planet. Conclusions. The GJ 1148 planetary system is a very rare M-dwarf planetary system consisting of a pair of gas giants, the inner of which resides in the HZ. We conclude that habitable exomoons around GJ 1148 b are very unlikely to exist.

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Section: The Gj 1148 Planetary Systemmentioning

confidence: 99%

The CARMENES search for exoplanets around M dwarfs

Trifonov

Lee²,

Kürster

et al. 2020

A&A

Self Cite

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A Reanalysis of the UVES M Dwarf Planet Search Program*

Butler

Jones

Feng

et al. 2019

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The UVES (Ultraviolet and Visible Spectrometer) M Dwarf Planet Search program surveyed 40 M dwarfs and 1 M giant from 2000 through 2007 March. Two of the M dwarfs were double-lined spectroscopic binaries. The 38 single-lined M dwarfs in this survey are among the nearest and brightest M dwarfs. Starting with the reduced 1D spectra provided by the UVES team, we reanalyzed the UVES velocities of Proxima Cen as part of the “Pale Red Dot” program. The velocity rms decreased from 3.6 to 2.3 m s−1. Motivated by this result, we have harvested all of the raw data from the UVES M Dwarf Planet Search from the European Southern Observatory (ESO) archives and have written custom packages to generate 1D spectra from the raw data, and velocities from the 1D spectra. The median improvement in the velocity rms from the new analysis is 1.8 m s−1. Six of the 38 M dwarfs from the original study had a velocity rms < 4 m s−1. In the reanalysis presented here, 22 of these stars have a velocity rms < 4 m s−1. We improve the upper limits on possible planets orbiting these stars by a factor of typically two to three. For many of these M dwarfs, these observations represent the first epoch of high-precision velocity measurements.

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New HARPS and FEROS Observations of GJ 1046

Cited by 2 publications

References 18 publications

The CARMENES search for exoplanets around M dwarfs

The CARMENES search for exoplanets around M dwarfs

A Reanalysis of the UVES M Dwarf Planet Search Program*

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