HD 106515

HD 106515 is a binary star (and currently visual triple system) in the constellation of Virgo.

HD 106515
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
HD 106515 A
Right ascension 12h 15m 06.5667s[1]
Declination –07° 15′ 26.353″[1]
Apparent magnitude (V) +7.99[2]
HD 106515 B
Right ascension 12h 15m 06.1003s[3]
Declination –07° 15′ 26.587″[3]
Apparent magnitude (V) +8.25[2]
Characteristics
HD 106515 A
Spectral type K0 V[2]
HD 106515 B
Spectral type K1 V[2]
Astrometry
HD 106515 A
Radial velocity (Rv)20.66±0.11[4] km/s
Proper motion (μ) RA: −251.469[1] mas/yr
Dec.: −51.330[1] mas/yr
Parallax (π)29.3148 ± 0.0297 mas[1]
Distance111.3 ± 0.1 ly
(34.11 ± 0.03 pc)
HD 106515 B
Radial velocity (Rv)19.94±0.11[4] km/s
Proper motion (μ) RA: −244.603[3] mas/yr
Dec.: −67.744[3] mas/yr
Parallax (π)29.3908 ± 0.0294 mas[3]
Distance111.0 ± 0.1 ly
(34.02 ± 0.03 pc)
Absolute magnitude (MV)4.62[5]
Orbit[2]
PrimaryHD 106515 A
CompanionHD 106515 B
Period (P)4802.1+2397
−1141 yr
Semi-major axis (a)9.822+2.688
−1.329"
(345+95
−47 AU)
Eccentricity (e)0.420+0.106
−0.104
Inclination (i)164.45+3.5
−11.3°
Longitude of the node (Ω)92.06+45.08
−2.67°
Periastron epoch (T)2376.4+44.4
−78.9
Argument of periastron (ω)
(secondary)		250.50+38.22
−14.07°
Details[6]
HD 106515 A
Mass0.888±0.018 M☉
Radius0.910±0.009 R☉
Luminosity0.68±0.05[3] L☉
Surface gravity (log g)4.39±0.18 cgs
Temperature5364±57 K
Metallicity [Fe/H]+0.016±0.009 dex
Rotational velocity (v sin i)1.7[7] km/s
Age9.233±2.133 Gyr
HD 106515 B
Mass0.861±0.015 M☉
Radius0.865±0.015 R☉
Luminosity0.55±0.05[3] L☉
Surface gravity (log g)4.30±0.20 cgs
Temperature5190±58 K
Metallicity [Fe/H]+0.022±0.010 dex
Rotational velocity (v sin i)1.8[7] km/s
Age9.155±2.199 Gyr
Other designations
BD−06°3532, HIP 59743, ADS 8477 AB, WDS J12151-0715AB[8]
HD 106515 A: Gaia DR2 3584074380866605440, SAO 138673, LTT 4599, 2MASS J12150658-0715263[9]
HD 106515 B: Gaia DR2 3584074376569429248, SAO 138674, LTT 4598, 2MASS J12150611-0715265[10]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

The A and B stars are both K-type main-sequence stars, both somewhat smaller and cooler than the Sun. The two are gravitationally bound and separated at 310 AU. The binary semimajor axis is 390 AU.[5]

The third star in the visual triple, BD−06°3533, is a physically unrelated background star.[2]

Properties

HD 106515 AB is a wide binary system which was first observed by Jérôme de Lalande in 1795.[2]

The discovery of HD 106515 Ab was announced in a preprint submitted on September 12, 2011.[11] The discovery was made using radial velocity measurements obtained at the CORALIE spectrograph located at La Silla Observatory.[5] Confirmation of the discovery was made by a separate team using the Galileo National Telescope at the Roque de los Muchachos Observatory on the island of La Palma in the Canary Islands, Spain.[12] Initially announced as an exoplanet,[11] astrometric observations in 2021 have found that the true mass is significantly higher than its minimum mass predicted from radial velocity, so it is likely a brown dwarf.[13] A 2022 study found a true mass closer to the minimum mass, but the parameters are less well constrained.[14]

The HD 106515 A planetary system[13]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b 18.9+1.5
−1.4 MJ		 4.48±0.050 9.927+0.030
−0.032		 0.571±0.012 29.2+2.4
−2.2°		 —

References
  1. 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.
  2. Rica, F. M.; et al. (2017). "Dynamical Study of the Exoplanet Host Binary System HD 106515". Publications of the Astronomical Society of Australia. 34. e004. Bibcode:2017PASA...34....4R. doi:10.1017/pasa.2016.59.
  3. 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.
  4. Desidera, S.; et al. (2006). "Spectroscopic characterization of a sample of southern visual binaries". Astronomy and Astrophysics. 454 (2): 553–558. Bibcode:2006A&A...454..553D. doi:10.1051/0004-6361:20064895.
  5. Marmier, M.; et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551. A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639.
  6. Saffe, C.; et al. (2019). "High-precision analysis of binary stars with planets. I. Searching for condensation temperature trends in the HD 106515 system". Astronomy and Astrophysics. 625. A39. arXiv:1904.01955. Bibcode:2019A&A...625A..39S. doi:10.1051/0004-6361/201935352. S2CID 102484807.
  7. Sissa, E.; Gratton, R.; Desidera, S.; Martinez Fiorenzano, A. F.; Bonfanti, A.; Carolo, E.; Vassallo, D.; Claudi, R. U.; Endl, M.; Cosentino, R. (2016). "Hα-activity and ages for stars in the SARG survey". Astronomy and Astrophysics. 596: A76. arXiv:1609.04660. Bibcode:2016A&A...596A..76S. doi:10.1051/0004-6361/201628531. S2CID 54202186.
  8. "HD 106515". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-07.
  9. "HD 106515A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-07.
  10. "HD 106515B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-07.
  11. Mayor, M.; et al. (September 12, 2011). "The HARPS search for southern extra-solar planets XXXIV. Occurrence, mass distribution and orbital properties of super-Earths and Neptune-mass planets". arXiv:1109.2497 [astro-ph].
  12. Desidera, S.; et al. (2012). "A long-period massive planet around HD 106515A". Astronomy and Astrophysics. 546. A108. arXiv:1208.3963. Bibcode:2012A&A...546A.108D. doi:10.1051/0004-6361/201220038.
  13. Li, Yiting; Brandt, Timothy D.; Brandt, G. Mirek; Dupuy, Trent J.; Michalik, Daniel; Jensen-Clem, Rebecca; Zeng, Yunlin; Faherty, Jacqueline; Mitra, Elena L. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal. 162 (6): 266. arXiv:2109.10422. Bibcode:2021AJ....162..266L. doi:10.3847/1538-3881/ac27ab. S2CID 237592581.
  14. Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. S2CID 251864022.
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