The CARMENES search for exoplanets around M dwarfs: Dynamical characterization of the multiple planet system GJ 1148 and prospects of habitable exomoons around GJ 1148 b

被引：20

作者：

Trifonov, T. ^{[1
]}

Lee, M. H. ^{[2
,3
]}

Kuerster, M. ^{[1
]}

Henning, Th. ^{[1
]}

Grishin, E. ^{[4
]}

Stock, S. ^{[5
]}

Tjoa, J. ^{[6
]}

Caballero, J. A. ^{[7
]}

Wong, K. H. ^{[2
]}

Bauer, F. F. ^{[8
]}

Quirrenbach, A. ^{[5
]}

Zechmeister, M. ^{[9
]}

Ribas, I. ^{[10
,11
]}

Reffert, S. ^{[5
]}

Reiners, A. ^{[9
]}

Amado, P. J. ^{[8
]}

Kossakowski, D. ^{[1
]}

Azzaro, M. ^{[12
]}

Bejar, V. J. S. ^{[13
,14
]}

Cortes-Contreras, M. ^{[7
]}

Dreizler, S. ^{[9
]}

Hatzes, A. P. ^{[15
]}

Jeffers, S. V. ^{[9
]}

Kaminski, A. ^{[5
]}

Lafarga, M. ^{[10
,11
]}

Montes, D. ^{[16
,17
]}

Morales, J. C. ^{[10
,11
]}

Pavlov, A. ^{[1
]}

Rodriguez-Lopez, C. ^{[8
]}

Schmitt, J. H. M. M. ^{[18
]}

Solano, E. ^{[7
]}

Barnes, R. ^{[19
,20
]}

机构：

[1] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[2] Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Peoples R China

[3] Univ Hong Kong, Dept Phys, Pokfulman Rd, Hong Kong, Peoples R China

[4] Technion Israel Inst Technol, Dept Phys, IL-3200002 Haifa, Israel

[5] Heidelberg Univ, Landessternwarte, Zentrum Astron, Konigstuhl 12, D-69117 Heidelberg, Germany

[6] Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands

[7] ESAC, Ctr Astrobiol, CSIC, INTA, Camino Bajo del Castillo S-N, Madrid 28049, Spain

[8] CSIC, Inst Astrofis Andalucia IAA, Glorieta Astron S-N, Granada 18008, Spain

[9] Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[10] CSIC, Inst Ciencies Espai ICE, Campus UAB,C Can Magrans S-N, Barcelona 08193, Spain

[11] Inst Estudis Espacials Catalunya IEEC, C Gran Capita 2-4, Barcelona 08034, Spain

[12] Observ Astron Calar Alto, Ctr Astron Hispano Aleman, CSIC, MPG, Almeria 04550, Spain

[13] Inst Astrofis Canarias, Via Lactea S-N, Tenerife 38205, Spain

[14] Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain

[15] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

[16] Univ Complutense Madrid, Dept Fis Tierra & Astrofis, Fac Ciencias Fis, Madrid 28040, Spain

[17] Univ Complutense Madrid, IPARCOS, Fac Ciencias Fis, Intituto Fis Particulas & Cosmos, Madrid 28040, Spain

[18] Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[19] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[20] NASA, Virtual Planetary Lab, Washington, DC USA

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 638卷

基金：

欧洲研究理事会;

关键词：

planetary systems; stars: general; stars: late-type; planets and satellites: dynamical evolution and stability; stars: low-mass; RADIAL-VELOCITY VARIABILITY; SECULAR EVOLUTION; EXTRASOLAR PLANET; MASS PLANET; TERRESTRIAL PLANETS; TIDAL EVOLUTION; STAR; SATELLITES; STABILITY; CANDIDATE;

D O I：

10.1051/0004-6361/201936987

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：18

共 25 条

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