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BD−11 4672 is a single star with a pair of orbiting exoplanets in the southern constellation of Scutum, the shield. The designation BD−11 4672 comes from the Bonner Durchmusterung star catalogue, which was published during the nineteenth century in Germany. With an apparent visual magnitude of 9.99, the star is much too faint to be viewed with the naked eye. It is located at a distance of 89 light years from the Sun, as determined from parallax, but is drifting closer with a radial velocity of −87.5 km/s. This was recognised as a high proper motion star by German astronomer Max Wolf in 1924 and is traversing the celestial sphere at an angular rate of 0.401 arcsec yr.

The spectrum of BD−11 4672 matches a K-type main-sequence star, an orange dwarf, with a stellar classification of K7 V. Its age is not well constrained, but is probably older than the Sun. It is a metal-poor star, showing an iron abundance that is 35% of solar. No significant flare activity was detected. The star shows evidence of a Sun-like magnetic activity cycle with a period of 7–10 years. It has 65% of the mass and 64% of the radius of the Sun. The star is radiating 16% of the luminosity of the Sun from its photosphere at an effective temperature of 4,550 K.

Planetary system

In 2010, a team of astronomers led by astronomer C. Moutou [fr] of the High Accuracy Radial Velocity Planet Searcher performed a radial-velocity analysis, which led to the suspicion of a gas giant exoplanet in orbit around BD−11 4672. The existence of this exoplanet was confirmed in 2014. In 2020, a second exoplanet was detected on an interior and much more eccentric orbit near the inner edge of the Star's habitable zone.

See also

• list of exoplanets discovered in 2014 (BD-11 4672b)
• list of exoplanets discovered in 2020 (BD-11 4672c)

References

1. ^ 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.
2. ^ 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.
3. ^ Barbato, D.; 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.
4. ^ Moutou, Claire; et al. (March 2011), "The HARPS search for southern extra-solar planets: XXVI: Seven new planetary systems", Astronomy & Astrophysics, 527, arXiv:1012.3830, Bibcode:2011A&A...527A..63M, doi:10.1051/0004-6361/201015371, S2CID 118696125, A63.
5. ^ Soubiran, C.; et al. (2018), "Gaia Data Release 2. The catalogue of radial velocity standard stars", Astronomy and Astrophysics, 616: A7, arXiv:1804.09370, Bibcode:2018A&A...616A...7S, doi:10.1051/0004-6361/201832795, S2CID 52952408.
6. ^ Andreasen, D. T.; et al. (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.
7. "BD-11 4672". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-09-27.
8. Wolf, M.; Reinmuth, K. (1925), "Einige bewegte Sterne in Scutum", Astronomische Nachrichten, 223 (14): 231, Bibcode:1925AN....223..231W, doi:10.1002/asna.19242231404.
9. Luyten, W. J. (June 1995), "NLTT Catalogue (Luyten, 1979)", VizieR Online Data Catalog, Bibcode:1995yCat.1098....0L.
10. Lammer, H.; et al. (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.
11. Moutou, C.; et al. (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.
12. "Planet BD-11 4672 b", exoplanet.eu, retrieved 2024-01-05.

v t e Constellation of Scutum
List of stars in Scutum Scutum in Chinese astronomy
Stars	Bayer α β γ δ ε ζ η Variable R S UY V373 V452 V479 Other BD-11 4672 CoRoT-16 CoRoT-17 IRC −10414 2MASS J18450079–1409036 PSR B1828−11 PSR B1829−10 PSR J1841−0500 WR 114 WR 119 WR 120 WR 121-16 Stephenson 2 DFK 1 RSGC1-F01 RSGC1-F02 IRAS 18357-0604 Stephenson 2 DFK 49
Exoplanets BD-11 4672 b c CoRoT-16b CoRoT-17b
Star clusters	NGC 6649 6712 Other Alicante 7 Alicante 8 Alicante 10 Mercer 3 Messier 26 RSGC1 RSGC3 Stephenson 2 Wild Duck Cluster
Nebulae IC 1295
Category

• K-type main-sequence stars
• Planetary systems with two confirmed planets
• Scutum (constellation)
• Durchmusterung objects
• Hipparcos objects
• 2MASS objects
• TIC objects