BD-11 4672
BD-11 4672 is a 9th magnitude orange dwarf star located 88.7 light-years away in the constellation of Scutum. This star was recognised as a high proper motion star by Max Wolf in 1924.[4] It is a single star, and is the host to two known extrasolar planets.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 33m 28.8323s[1] |
| Declination | −11° 38′ 09.7218″[1] |
| Apparent magnitude (V) | 9.99[1] |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | K7V |
| B−V color index | 1.22 |
| Astrometry | |
| Radial velocity (Rv) | -87.5156±0.0011[1] km/s |
| Proper motion (μ) | RA: -288.590[1] mas/yr Dec.: -235.560[1] mas/yr |
| Parallax (π) | 36.7812 ± 0.0466 mas[1] |
| Distance | 88.7 ± 0.1 ly (27.19 ± 0.03 pc) |
| Details | |
| Mass | 0.651+0.031 −0.029[2] M☉ |
| Radius | 0.639+0.020 −0.022[2] R☉ |
| Luminosity (bolometric) | 0.157+0.019 −0.017 L☉ |
| Surface gravity (log g) | 4.642+0.027 −0.025 cgs |
| Temperature | 4550 ± 110 K |
| Metallicity [Fe/H] | -0.48±0.07[3] dex |
| Rotation | 25 d |
| Age | 7.4+4.5 −4.9 Gyr |
| Other designations | |
BD-11 4672, GSC 05699-02129, HIP 90979, TYC 5262-825-1, 2MASS J18332885-1138097, TYC 5699-2129-1, Wolf 1462, GJ 717, Gaia DR2 4154598526336121600 | |
| Database references | |
| SIMBAD | data |
Characteristics
BD-11 4672 is an K-type main sequence star. Its age is not well constrained, but is probably older than the Sun. Its metallicity is 35% that of the Sun.[3] No significant flare activity was detected.[5]
Planetary system
In 2010, a team of astronomers led by astronomer C. Moutou of the High Accuracy Radial Velocity Planet Searcher performed a radial-velocity analysis, which led to the suspicion of a gas giant planet in orbit around BD-11 4672.[6] The planet existence was proven in 2014.[7] In 2020, another gas giant planet was detected.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >0.65±0.05 MJ | 2.36±0.04 | 1634±14 | 0.05±0.05 | — | — |
| c | >0.04836+0.009 −0.0066 MJ |
0.3±0.01 | 74.2±0.08 | 0.4±0.15 | — | — |
References
- BD-11 4672, entry, SIMBAD. Accessed online September 27, 2020.
- Barbato, D.; Pinamonti, M.; Sozzetti, A.; Biazzo, K.; Benatti, S.; Damasso, M.; Desidera, S.; Lanza, A. F.; Maldonado, J.; Mancini, L.; Scandariato, G.; Affer, L.; Andreuzzi, G.; Bignamini, A.; Bonomo, A. S.; Borsa, F.; Carleo, I.; Claudi, R.; Cosentino, R.; Covino, E.; Fiorenzano, A. F. M.; Giacobbe, P.; Harutyunyan, A.; Knapic, C.; Leto, G.; Lorenzi, V.; Maggio, A.; Malavolta, L.; Micela, G.; et al. (2020), "The GAPS Programme at TNG XXIV. An eccentric Neptune-mass planet near the inner edge of the BD-11 4672 habitable zone", Astronomy & Astrophysics, A68: 641, arXiv:2006.14393, Bibcode:2020A&A...641A..68B, doi:10.1051/0004-6361/202037954, S2CID 220055727
- Andreasen, D. T.; Sousa, S. G.; Tsantaki, M.; Teixeira, G. D. C.; Mortier, A.; Santos, N. C.; Suarez-Andres, L.; Delgado-Mena, E.; Ferreira, A. C. S. (2017), "SWEET-Cat update and FASMA A new minimization procedure for stellar parameters using high-quality spectra", Astronomy & Astrophysics, A69: 600, arXiv:1703.06671, Bibcode:2017A&A...600A..69A, doi:10.1051/0004-6361/201629967, S2CID 119534579
- Wolf, M.; Reinmuth, K. (1925). "Einige bewegte Sterne in Scutum". Astronomische Nachrichten. 223 (14): 231. Bibcode:1925AN....223..231W. doi:10.1002/asna.19242231404.
- Lammer, H.; Kővári, Zs; Hanslmeier, A.; Koller, F.; Korhonen, H.; Guenther, E. W.; Kriskovics, L.; Vida, K.; Greimel, R.; Odert, P.; Leitzinger, M. (2020), "A census of Coronal Mass Ejections on solar-like stars", Monthly Notices of the Royal Astronomical Society, 493 (3): 4570–4589, arXiv:2002.04430, Bibcode:2020MNRAS.493.4570L, doi:10.1093/mnras/staa504, S2CID 211076125
- Moutou, Claire; Mayor, Michel; Lo Curto, Gaspare; Ségransan, Damien; Udry, Stéphane; Bouchy, François; Benz, Willy; Lovis, Christophe; Naef, Dominique; Pepe, Francesco; Queloz, Didier; Santos, Nuno C.; Sousa, Sérgio Gonçalves (2010), The HARPS search for southern extra-solar planets: XXVI: Seven new planetary systems, arXiv:1012.3830, doi:10.1051/0004-6361/201015371, S2CID 118696125
- Moutou, C.; Lo Curto, G.; Mayor, M.; Bouchy, F.; Benz, W.; Lovis, C.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Ségransan, D.; Sousa, S. G.; Udry, S. (2014), "The HARPS search for southern extra-solar planets", Astronomy & Astrophysics, 576: A48, arXiv:1412.6591, Bibcode:2015A&A...576A..48M, doi:10.1051/0004-6361/201424965, S2CID 118512899
- Planet BD-11 4672 b on exoplanet.eu
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