Red dwarf in constellation of Draco
Gliese 625
Observation dataEpoch J2000 Equinox J2000
Constellation
Draco
Right ascension 16h 25m 24.62304s [ 1]
Declination
+54° 18′ 14.7655″[ 1]
Apparent magnitude (V)10.13[ 2]
Characteristics
Spectral type
M1.5V[ 3]
B−V color index
1.591± 0.027[ 2]
Astrometry Radial velocity (Rv )± 0.14[ 1] Proper motion (μ) RA: mas /yr [ 1] Dec.: mas /yr [ 1] Parallax (π)154.3503 ± 0.0161 mas [ 1] Distance 21.131 ± 0.002 ly pc ) Absolute magnitude (MV )11.06[ 2] Details Mass 0.240± 0.013[ 4] M ☉ Radius 0.255± 0.034[ 4] R ☉ Luminosity 0.01482± 0.00022[ 5] L ☉ Surface gravity (log g )4.94± 0.06[ 6] cgs Temperature ± 9[ 7] K Metallicity −0.401± 0.005[ 7] dex Rotation ± 5.5 d[ 6] Rotational velocity (v sin i )2.2± 0.7[ 7] Other designations 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[ 8] Database references SIMBAD data
GJ 625 (AC 54 1646-56 ) is a small red dwarf star with an exoplanetary companion in the northern constellation of Draco . The system is located at a distance of 21.1 light-years from the Sun based on parallax ,[ 1] radial velocity of −13 km/s.[ 7] apparent visual magnitude of 10.13[ 2] absolute magnitude of 11.06.[ 2]
This is an M-type main-sequence star with a stellar classification of M1.5V.[ 3] rotation period of roughly 78 days, and has a low magnetic activity level.[ 6] [ 4] metal content is 40% the abundances in the Sun's atmosphere. It is radiating just 1.5% of the luminosity of the Sun from its photosphere at an effective temperature of 3,557 K.[ 7]
Planetary system
On May 18, 2017, a planet was detected orbiting GJ 625 by the HARPS-N telescope. The planet, GJ 625 b, orbits near the inner edge of the optimistic circumstellar habitable zone of its star, and the discoverers speculate it may support liquid water, depending on atmospheric conditions.[ 6] runaway greenhouse effect , similar to Venus .[ 9] [ 10] [ 11] [ 12]
Since the star is considered quiescent (having a low X-ray emission and flare rate), the radio emission from the system may be auroral in nature and coming from a short-period planet. Further observations will be needed to confirm this.[ 13]
References
^ a b c d e f 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 .^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . S2CID 119257644 . ^ a b 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 Bibcode :2015A&A...577A.128A . doi :10.1051/0004-6361/201525803 . S2CID 53135130 . A128. ^ a b c 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 Bibcode :2020MNRAS.493.4533K . doi :10.1093/mnras/staa427 ^ 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 Bibcode :2019A&A...625A..68S . doi :10.1051/0004-6361/201834965 . S2CID 102351979 . A68. VizieR entry Archived 2021-05-12 at the Wayback Machine ^ a b c d e 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" . Astronomy and Astrophysics . 605 . A92. arXiv :1705.06537 Bibcode :2017A&A...605A..92S . doi :10.1051/0004-6361/201730957 . S2CID 119003137 . Archived from the original on 2023-09-23. Retrieved 2018-10-06 . ^ a b c d e 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 Bibcode :2018MNRAS.475.1960F . doi :10.1093/mnras/stx3246 ^ "G 202-48" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2021-11-21 .^ Kopparapu, Ravi Kumar; et al. (2013). "Habitable Zones Around Main-Sequence Stars: New Estimates". The Astrophysical Journal . 765 (2): 131. arXiv :1301.6674 Bibcode :2013ApJ...765..131K . doi :10.1088/0004-637X/765/2/131 . S2CID 76651902 . ^ Kopparapu, Ravi Kumar. "Calculation of Habitable Zones" . Archived from the original on 20 November 2023. Retrieved 20 November 2023 . ^ "GJ 625" . hzgallery.org . Archived from the original on 15 September 2022. Retrieved 15 September 2022 .^ LePage, Andrew (22 May 2017). "Habitable Planet Reality Check: Is GJ 625b a Super-Earth or a Super-Venus?" . drewexmachina.com . Archived from the original on 25 May 2017. Retrieved 15 September 2022 . ^ 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 Bibcode :2021ApJ...919L..10P . doi :10.3847/2041-8213/ac230c S2CID 238583021 . L10.
