CD−44 170
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Phoenix[1] |
| Right ascension | 00h 39m 58.8236s[2] |
| Declination | −44° 15′ 11.577″[2] |
| Apparent magnitude (V) | 11.401[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | M0.5V[4] |
| Astrometry | |
| Radial velocity (Rv) | 11.85±0.19[2] km/s |
| Proper motion (μ) | RA: 483.002[2] mas/yr Dec.: −221.111[2] mas/yr |
| Parallax (π) | 42.3320±0.0248 mas[2] |
| Distance | 77.05 ± 0.05 ly (23.62 ± 0.01 pc) |
| Absolute magnitude (MV) | +9.51[1] |
| Details | |
| Mass | 0.53[4] M☉ |
| Radius | 0.52[5] R☉ |
| Luminosity | 0.04597±0.00087[6] L☉ |
| Surface gravity (log g) | 4.73[7] cgs |
| Temperature | 3604±72[8] K |
| Metallicity [Fe/H] | −0.09±0.09[8] dex |
| Rotation | 31.8 d[4] |
| Rotational velocity (v sin i) | 2.00[9] km/s |
| Age | 8.27±4.08[7] Gyr |
| Other designations | |
| Gaia DR2 4980466929964496128, GJ 27.1, HIP 3143, TYC 7531-1014-1, 2MASS J00395880-4415117[10] | |
| Database references | |
| SIMBAD | data |
CD−44 170, also known as Gliese 27.1, Gliese 9018 and HIP 3143, is an M-type main-sequence star. Its surface temperature is 3,604 K (6,028 °F; 3,331 °C)±72 K. The star's concentration of heavy elements is similar to that of the Sun.[8]
Planetary system
In 2014, a planet named Gliese 27.1 b with an orbital period of 16 days was announced. It was discovered using the radial velocity method.[11] The planetary equilibrium temperature is 406 K (271 °F; 133 °C).[6] The planet's existence was doubted until 2020 because the putative orbital period is equal to half of the star's rotational period.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (disputed) | > 13+4.1 −6.6 M🜨 |
0.101+0.009 −0.013 |
15.8190+0.0049 −0.0026 |
— | — | >3.63 R🜨 |
References
- ^ a b 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. XHIP record for this object at VizieR.
- ^ a b c d e f g 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.
- ^ Koen, C.; Kilkenny, D.; Van Wyk, F.; Marang, F. (2010). "UBV ( RI )C JHK observations of Hipparcos -selected nearby stars". Monthly Notices of the Royal Astronomical Society. 403 (4): 1949–1968. Bibcode:2010MNRAS.403.1949K. doi:10.1111/j.1365-2966.2009.16182.x.
- ^ a b c d Feng, Fabo; Butler, R. Paul; Shectman, Stephen A.; Crane, Jeffrey D.; Vogt, Steve; Chambers, John; Jones, Hugh R. A.; Wang, Sharon Xuesong; Teske, Johanna K.; Burt, Jenn; Díaz, Matías R.; Thompson, Ian B. (2020). "Search for Nearby Earth Analogs. II. Detection of Five New Planets, Eight Planet Candidates, and Confirmation of Three Planets around Nine Nearby M Dwarfs". The Astrophysical Journal Supplement Series. 246 (1): 11. arXiv:2001.02577. Bibcode:2020ApJS..246...11F. doi:10.3847/1538-4365/ab5e7c. S2CID 210064560.
- ^ Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berta-Thompson, Zachory K.; Dittmann, Jason A. (2016). "The Impact of Stellar Rotation on the Detectability of Habitable Planets Around M Dwarfs". The Astrophysical Journal. 821 (1): L19. arXiv:1604.03135. Bibcode:2016ApJ...821L..19N. doi:10.3847/2041-8205/821/1/L19. S2CID 73538034.
- ^ a b c Martínez-Rodríguez, Héctor; Caballero, José Antonio; Cifuentes, Carlos; Piro, Anthony L.; Barnes, Rory (2019). "Exomoons in the Habitable Zones of M Dwarfs". The Astrophysical Journal. 887 (2): 261. arXiv:1910.12054. Bibcode:2019ApJ...887..261M. doi:10.3847/1538-4357/ab5640. S2CID 204904780.
- ^ a b Maldonado, J.; Micela, G.; Baratella, M.; d'Orazi, V.; Affer, L.; Biazzo, K.; Lanza, A. F.; Maggio, A.; González Hernández, J. I.; Perger, M.; Pinamonti, M.; Scandariato, G.; Sozzetti, A.; Locci, D.; Di Maio, C.; Bignamini, A.; Claudi, R.; Molinari, E.; Rebolo, R.; Ribas, I.; Toledo-Padrón, B.; Covino, E.; Desidera, S.; Herrero, E.; Morales, J. C.; Suárez-Mascareño, A.; Pagano, I.; Petralia, A.; Piotto, G.; Poretti, E. (2020). "HADES RV programme with HARPS-N at TNG". Astronomy & Astrophysics. 644: A68. arXiv:2010.14867. Bibcode:2020A&A...644A..68M. doi:10.1051/0004-6361/202039478.
- ^ a b c Kuznetsov, M. K.; Del Burgo, C.; Pavlenko, Ya. V.; Frith, J. (2019). "Characterization of a Sample of Southern M Dwarfs Using Harps and X-shooter Spectra". The Astrophysical Journal. 878 (2): 134. Bibcode:2019ApJ...878..134K. doi:10.3847/1538-4357/ab1fe9.
- ^ Liebing, F.; Jeffers, S. V.; Reiners, A.; Zechmeister, M. (2021). "Convective blueshift strengths of 810 F to M solar-type stars". Astronomy & Astrophysics. 654: A168. arXiv:2108.03859. Bibcode:2021A&A...654A.168L. doi:10.1051/0004-6361/202039607.
- ^ "CD-44 170". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-26.
- ^ Tuomi, Mikko; Jones, Hugh R. A.; Barnes, John R.; Anglada-Escudé, Guillem; Jenkins, James S. (2014). "Bayesian search for low-mass planets around nearby M dwarfs – estimates for occurrence rate based on global detectability statistics". Monthly Notices of the Royal Astronomical Society. 441 (2): 1545–1569. arXiv:1403.0430. Bibcode:2014MNRAS.441.1545T. doi:10.1093/mnras/stu358.