期刊
ASTRONOMY & ASTROPHYSICS
卷 638, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201936987
关键词
planetary systems; stars: general; stars: late-type; planets and satellites: dynamical evolution and stability; stars: low-mass
资金
- German Max-Planck-Gesellschaft (MPG)
- Spanish Consejo Superior de Investigaciones Cientificas (CSIC)
- European Union through FEDER/ERF funds [FICTS-2011-02]
- CARMENES Consortium (Max-Planck-Institut fur Astronomie)
- CARMENES Consortium (Instituto de Astrofisica de Andalucia)
- CARMENES Consortium (Landessternwarte Konigstuhl)
- CARMENES Consortium (Institut de Ciencies de l'Espai)
- CARMENES Consortium (Insitut fur Astrophysik Gottingen)
- CARMENES Consortium (Universidad Complutense de Madrid)
- CARMENES Consortium (Thuringer Landessternwarte Tautenburg)
- CARMENES Consortium (Instituto de Astrofisica de Canarias)
- CARMENES Consortium (Hamburger Sternwarte)
- CARMENES Consortium (Centro de Astrobiologia)
- CARMENES Consortium (Centro Astronomico Hispano-Aleman)
- Spanish Ministry of Economy
- German Science Foundation (DFG)
- Klaus Tschira Stiftung
- state of BadenWurttemberg
- state of Niedersachsen
- DFG Research Unit [FOR2544, RE 2694/4-1]
- Junta de Andalucia
- Agencia Estatal de Investigacion of the Ministerio de Ciencia, Innovacion y Universidades
- European FEDER/ERF funds [AYA2016-79425-C3-1/2/3-P, AYA2015-69350-C3-2-P, ESP2017-87676-C5-2-R, ESP2017-87143-R]
- Centre of Excellence Severo Ochoa award [SEV-2015-0548]
- Centre of Excellence Maria de Maeztu award [SEV-2015-0548]
- Instituto de Astrofisica de Andalucia [SEV-2017-0709]
- Centro de Astrobiologia [MDM-2017-0737]
- Hong Kong RGC grant [HKU 17305618]
- NASA Virtual Planetary Laboratory [80NSSC18K0829]
- European Research Council under the Horizon 2020 Framework Program via the ERC
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 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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