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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.

BD-11 4672
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]
Distance88.7 ± 0.1 ly
(27.19 ± 0.03 pc)
Details
Mass0.651+0.031
−0.029[2] M☉
Radius0.639+0.020
−0.022[2] R☉
Luminosity (bolometric)0.157+0.019
−0.017[citation needed] L☉
Surface gravity (log g)4.642+0.027
−0.025[citation needed] cgs
Temperature4550 ± 110[citation needed] K
Metallicity [Fe/H]-0.48±0.07[3] dex
Rotation25 d[citation needed]
Age7.4+4.5
−4.9[citation needed] 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
SIMBADdata

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]

The BD-11 4672 planetary system[8][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


  1. BD-11 4672, entry, SIMBAD. Accessed online September 27, 2020.
  2. 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
  3. 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
  4. Wolf, M.; Reinmuth, K. (1925). "Einige bewegte Sterne in Scutum". Astronomische Nachrichten. 223 (14): 231. Bibcode:1925AN....223..231W. doi:10.1002/asna.19242231404.
  5. 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
  6. 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
  7. 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, doi:10.1051/0004-6361/201424965, S2CID 118512899
  8. Planet BD-11 4672 b on exoplanet.eu



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