Gliese 849

Gliese 849 is a M3.5V red dwarf star approximately 29 light years away in the constellation of Aquarius. It has the first planet discovered orbiting a red dwarf with a semi-major axis greater than 0.21 AU.[4]

Gliese 849
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension  22h 9m 40.3444s[1]
Declination –4° 38′ 26.6513″[1]
Apparent magnitude (V) 10.42
Characteristics
Spectral type M3.5V
U−B color index 1.13
B−V color index 1.51
V−R color index 1.11
R−I color index 1.41
Astrometry
Radial velocity (Rv)−12 ± 5 km/s
Proper motion (μ) RA: 1132.534±0.081[1] mas/yr
Dec.: −22.125±0.083[1] mas/yr
Parallax (π)113.6000 ± 0.0463[1] mas
Distance28.71 ± 0.01 ly
(8.803 ± 0.004 pc)
Absolute magnitude (MV)10.70
Details
Mass0.36 M☉
Radius0.52 ± 0.07 R☉
Luminosity0.029 L☉
Surface gravity (log g)4.66 cgs
Temperature3,601 ± 19[2] K
Metallicity+0.31 ± 0.17[2]
Rotation39.2±6.3 d[3]
Other designations
BD-05 5715, GCRV 13921, HIP 109388, LFT 1689, LHS 517, LPM 814, LTT 8889, NLTT 53078
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata
Planet
Gliese 849bdata

Planetary system

In late 2006, a long-period Jupiter-like planet was reported to be orbiting the red dwarf in a period just over 5 years in length. There was also a linear trend in the radial velocities which suggested another longer period companion.[5] The trend in the radial velocities was confirmed in 2013.[6] An orbit for the second planet was finally determined in 2015.[4]

The Gliese 849 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >0.911±0.036 MJ 2.39±0.082 1924±15 0.038±0.019 — —
c >0.944±0.070 MJ 4.82±0.21 5520±390 0.087±0.056 — —

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Rojas-Ayala, Bárbara; et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs" (PDF). The Astrophysical Journal. 748 (2): 93. arXiv:1112.4567. Bibcode:2012ApJ...748...93R. doi:10.1088/0004-637X/748/2/93. See table 3.
  3. Suárez Mascareño, A.; et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society, 452 (3): 2745–2756, arXiv:1506.08039, Bibcode:2015MNRAS.452.2745S, doi:10.1093/mnras/stv1441.
  4. Feng, Y. Katherina; et al. (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800 (1). 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22.
  5. Butler, R. Paul; et al. (2006). "A Long-Period Jupiter-Mass Planet Orbiting the Nearby M Dwarf GJ 849". Publications of the Astronomical Society of the Pacific. 118 (850): 1685–1689. arXiv:astro-ph/0610179. Bibcode:2006PASP..118.1685B. doi:10.1086/510500.
  6. Bonfils, X.; et al. (2013). "The HARPS search for southern extra-solar planets. XXXI. The M-dwarf sample". Astronomy and Astrophysics. 549. A109. arXiv:1111.5019. Bibcode:2013A&A...549A.109B. doi:10.1051/0004-6361/201014704.


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