Gliese 625
GJ 625 (AC 54 1646-56) is a small red
dwarf star with an exoplanetary
Gliese 625
companion in the northern constellation Observation data
of Draco. The system is located at a Epoch J2000 Equinox J2000
distance of 21.1 light-years from the Sun
Constellation Draco
based on parallax,[1] but is drifting closer
with a radial velocity of −13 km/s.[4] It is Right ascension 16h 25m 24.6233s[1]
too faint to be visible to the naked eye, Declination 54° 18′ 14.7658″[1]
having an apparent visual magnitude of
Apparent magnitude (V) 10.13[2]
10.13[2] and an absolute magnitude of
Characteristics
11.06.[2]
Spectral type M1.5V[3]
This is an M-type main-sequence star
B−V color index 1.591 ± 0.027[2]
with a stellar classification of M1.5V.[3] It
is spinning slowly with a rotation period Astrometry
of roughly 78 days, and has a low Radial velocity (Rv) −13.01 ± 0.6[4] km/s
magnetic activity level.[8] The star has
about a quarter of the mass and size of Proper motion (μ) RA: 432.073 ± 0.064 mas/yr[1]
the Sun,[6] and the metal content is 40% Dec.: −171.668 ± 0.059 mas/yr[1]
the abundances in the Sun's atmosphere. Parallax (π) 154.3503 ± 0.0161 mas[5]
It is radiating just 1.5% of the luminosity
Distance 21.131 ± 0.002 ly
of the Sun from its photosphere at an
(6.4788 ± 0.0007 pc)
effective temperature of 3,557 K.[4]
Absolute magnitude (MV) 11.06[2]
Planetary system Details
Mass 0.240 ± 0.013[6] M☉
On May 18, 2017, a planet was detected
orbiting AC 54 1646-56 by the HARPS- Radius 0.255 ± 0.034[6] R☉
N telescope.[8] The planet, AC 54 1646- Luminosity 0.01482 ± 0.00022[7] L☉
56b or (GJ 625b) orbits on the inner edge
Surface gravity (log g) 4.94 ± 0.06[8] cgs
of the optimistic circumstellar habitable
zone of its star, and may support liquid Temperature 3,557 ± 9[4] K
water. Since the star is considered Metallicity [Fe/H] −0.401 ± 0.005[4] dex
quiescent (having a low X-ray emission
Rotation 77.8 ± 5.57 d[8]
and flare rate), the radio emission from
the system may be auroral in nature and Rotational velocity 2.2 ± 0.7[4] km/s
coming from a short-period planet. (v sin i)
Further observations will be needed to
Other designations
confirm this.[10]
GJ 625, HIP 80459, AC +54 1646,
G 202-48, G 226-7, G 225-62,
LSPM J1625+5418, NLTT 42804,
PLX 3740.03, TYC 3878-1193-1,
2MASS J16252459+5418148[9]
Database references
SIMBAD data (https://simbad.cds.unistra.
fr/simbad/sim-id?Ident=GJ+625)
The Gliese 625 planetary system
Companion Semimajor axis Orbital period
Mass Eccentricity Inclination Radius
(in order from star) (AU) (days)
b 2.82±0.51 M🜨 0.078 14.628±0.013 — — —
References
1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary
of the contents and survey properties" (https://doi.org/10.1051%2F0004-6361%2F20183305
1). Astronomy & Astrophysics. 616. A1. arXiv:1804.09365 (https://arxiv.org/abs/1804.09365).
Bibcode:2018A&A...616A...1G (https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G).
doi:10.1051/0004-6361/201833051 (https://doi.org/10.1051%2F0004-6361%2F201833051).
Gaia DR2 record for this source (http://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%20
1428427236986209024) at VizieR.
2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy
Letters. 38 (5): 331. arXiv:1108.4971 (https://arxiv.org/abs/1108.4971).
Bibcode:2012AstL...38..331A (https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A).
doi:10.1134/S1063773712050015 (https://doi.org/10.1134%2FS1063773712050015).
S2CID 119257644 (https://api.semanticscholar.org/CorpusID:119257644).
3. Alonso-Floriano, F. J.; et al. (May 2015). "CARMENES input catalogue of M dwarfs. I. Low-
resolution spectroscopy with CAFOS". Astronomy & Astrophysics. 577: 19.
arXiv:1502.07580 (https://arxiv.org/abs/1502.07580). Bibcode:2015A&A...577A.128A (https://
ui.adsabs.harvard.edu/abs/2015A&A...577A.128A). doi:10.1051/0004-6361/201525803 (http
s://doi.org/10.1051%2F0004-6361%2F201525803). S2CID 53135130 (https://api.semantics
cholar.org/CorpusID:53135130). A128.
4. Fouqué, Pascal; et al. (April 2018). "SPIRou Input Catalogue: global properties of 440 M
dwarfs observed with ESPaDOnS at CFHT". Monthly Notices of the Royal Astronomical
Society. 475 (2): 1960–1986. arXiv:1712.04490 (https://arxiv.org/abs/1712.04490).
Bibcode:2018MNRAS.475.1960F (https://ui.adsabs.harvard.edu/abs/2018MNRAS.475.196
0F). doi:10.1093/mnras/stx3246 (https://doi.org/10.1093%2Fmnras%2Fstx3246).
5. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of
the contents and survey properties" (https://doi.org/10.1051%2F0004-6361%2F202039657).
Astronomy & Astrophysics. 649: A1. arXiv:2012.01533 (https://arxiv.org/abs/2012.01533).
Bibcode:2021A&A...649A...1G (https://ui.adsabs.harvard.edu/abs/2021A&A...649A...1G).
doi:10.1051/0004-6361/202039657 (https://doi.org/10.1051%2F0004-6361%2F202039657).
S2CID 227254300 (https://api.semanticscholar.org/CorpusID:227254300).
(Erratum: doi:10.1051/0004-6361/202039657e (https://doi.org/10.1051%2F0004-6361%2F202039
657e)). Gaia EDR3 record for this source (http://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20
EDR3%201428427236986209024) at VizieR.
6. Khata, Dhrimadri; et al. (April 2020). "Understanding the physical properties of young M
dwarfs: NIR spectroscopic studies". Monthly Notices of the Royal Astronomical Society. 493
(3): 4533–4550. arXiv:2002.05762 (https://arxiv.org/abs/2002.05762).
Bibcode:2020MNRAS.493.4533K (https://ui.adsabs.harvard.edu/abs/2020MNRAS.493.453
3K). doi:10.1093/mnras/staa427 (https://doi.org/10.1093%2Fmnras%2Fstaa427).
7. Schweitzer, A.; et al. (May 2019). "The CARMENES search for exoplanets around M dwarfs.
Different roads to radii and masses of the target stars". Astronomy & Astrophysics. 625: 16.
arXiv:1904.03231 (https://arxiv.org/abs/1904.03231). Bibcode:2019A&A...625A..68S (https://
ui.adsabs.harvard.edu/abs/2019A&A...625A..68S). doi:10.1051/0004-6361/201834965 (http
s://doi.org/10.1051%2F0004-6361%2F201834965). S2CID 102351979 (https://api.semantic
scholar.org/CorpusID:102351979). A68. VizieR entry (https://vizier.u-strasbg.fr/viz-bin/VizieR
-5?-ref=VIZ609c64ba24592f&-out.add=.&-source=J/A%2bA/625/A68/tableb1&recno=200)
8. Suárez Mascareño, A.; et al. (2017). "HADES RV Programme with HARPS-N at TNG. V. A
super-Earth on the inner edge of the habitable zone of the nearby M dwarf GJ 625" (https://w
ww.aanda.org/articles/aa/full_html/2017/09/aa30957-17/aa30957-17.html). Astronomy and
Astrophysics. 605. A92. arXiv:1705.06537 (https://arxiv.org/abs/1705.06537).
Bibcode:2017A&A...605A..92S (https://ui.adsabs.harvard.edu/abs/2017A&A...605A..92S).
doi:10.1051/0004-6361/201730957 (https://doi.org/10.1051%2F0004-6361%2F201730957).
S2CID 119003137 (https://api.semanticscholar.org/CorpusID:119003137).
9. "G 202-48" (http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+202-48). SIMBAD. Centre
de données astronomiques de Strasbourg. Retrieved 2021-11-21.
10. Pope, Benjamin J. S.; et al. (September 2021). "The TESS View of LOFAR Radio-emitting
Stars". The Astrophysical Journal Letters. 919 (1): 8. arXiv:2110.04759 (https://arxiv.org/abs/
2110.04759). Bibcode:2021ApJ...919L..10P (https://ui.adsabs.harvard.edu/abs/2021ApJ...91
9L..10P). doi:10.3847/2041-8213/ac230c (https://doi.org/10.3847%2F2041-8213%2Fac230
c). S2CID 238583021 (https://api.semanticscholar.org/CorpusID:238583021). L10.
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