Gliese 649

Gliese 649
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Hercules
Right ascension	16h 58m 08.84961s[1]
Declination	+25° 44′ 38.9741″[1]
Apparent magnitude (V)	9.655[2]
Characteristics
Spectral type	M1.0V[2]
Apparent magnitude (B)	11.21
Apparent magnitude (R)	8.8
Apparent magnitude (I)	8.0
Apparent magnitude (J)	6.448[2]
Apparent magnitude (H)	5.865[2]
Apparent magnitude (K)	5.624[2]
B−V color index	1.48[2]
V−R color index	0.8
R−I color index	0.8
Astrometry
Radial velocity (Rv)	3.76±0.13[1] km/s
Proper motion (μ)	RA: −115.314(21) mas/yr[1] ; Dec.: −508.087(26) mas/yr[1]
Parallax (π)	96.2333 ± 0.0244 mas[1]
Distance	33.892 ± 0.009 ly ; (10.391 ± 0.003 pc)
Absolute magnitude (MV)	9.595
Details
Mass	0.524±0.012[3] M☉
Radius	0.531±0.012[3] R☉
Luminosity	0.04373±0.00045[3] L☉
Surface gravity (log g)	4.76±0.04[2] cgs
Temperature	3,621+41; −40[3] K
Metallicity [Fe/H]	−0.15±0.09[2] dex
Rotation	24.89+0.34; −0.35 d[2]
Age	0.48 Gyr
Other designations
	HIP 83043, TYC 2063-00479-1, BD+25 3173, 2MASS J16580884+2544392
Database references
SIMBAD	data
Exoplanet Archive	data
ARICNS	data
Extrasolar Planets; Encyclopaedia	data

Gliese 649 is a red dwarf star in the constellation of Hercules, located 33.9 light-years (10.4 parsecs) from the Sun. The star has been found to host an exoplanet.

Planetary system

A Saturn-mass planet was detected around the red dwarf star by Johnson et al. (2010).[4] It has a minimum mass 32.8% of Jupiter's mass and is located 1.15 astronomical units from its star in eccentric orbit (e=0.3). Assuming a luminosity of 4.5% that of the Sun, the habitable zone is located at 0.21 AU, thus the planet should be as cold as if it were located at 5.5 AU from a Solar-like star. Also accounting for different periastron and apastron positions of 0.8 and 1.49 AU respectively, the planet could likely show seasonal temperature changes.

Debris disk

Using results from the Herschel Space Observatory survey of 21 late-type stars carried out in 2010, a debris disk was discovered between approximately 6 and 30 au. The disk was not detected at 22µm by NASA's Wide-field Infrared Survey Explorer so therefore it is likely to be below 100 Kelvin and similar to the Kuiper belt. The disk was marginally resolved, appearing very asymmetric, and so is probably consistent with being closer to edge-on, rather than face-on, in its inclination.[5]

The Gliese 649 planetary system[2][5]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥0.258+0.023 −0.022 M_J	1.112+0.035 −0.037	600.1±1.7	0.083+0.068 −0.055	—	—
Kuiper belt	~6–~30 AU				~45-90°	—

References

Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
Pinamonti, M.; Barbato, D.; et al. (June 2023). "The GAPS programme at TNG. XLVI. Deep search for low-mass planets in late-dwarf systems hosting cold Jupiters". Astronomy & Astrophysics. arXiv:2306.04419.
Pineda, J. Sebastian; Youngblood, Allison; France, Kevin (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars". The Astrophysical Journal. 918 (1): 23. arXiv:2106.07656. Bibcode:2021ApJ...918...40P. doi:10.3847/1538-4357/ac0aea. S2CID 235435757. 40.
Johnson, John Asher; et al. (2010). "The California Planet Survey II. A Saturn-Mass Planet Orbiting the M Dwarf Gl649". The Publications of the Astronomical Society of the Pacific. 122 (888): 149–155. arXiv:0912.2730. Bibcode:2010PASP..122..149J. doi:10.1086/651007. S2CID 119254409.
Kennedy, Grant M.; et al. (2018). "Kuiper Belt Analogues in Nearby M-type Planet-host Systems". Monthly Notices of the Royal Astronomical Society. 476 (4): 4584–4591. arXiv:1803.02832. Bibcode:2018MNRAS.476.4584K. doi:10.1093/mnras/sty492. S2CID 62879401.

Gliese 649

Planetary system

Debris disk

References

See also