Astronomy:HD 106515

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Short description: Binary star system in the constellation Virgo
HD 106515
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|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[1] mas
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[3] mas
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
 astronomical unit|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
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

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

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. 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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. doi:10.1017/pasa.2016.59. Bibcode2017PASA...34....4R. 
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. 4.0 4.1 Desidera, S. et al. (2006). "Spectroscopic characterization of a sample of southern visual binaries". Astronomy and Astrophysics 454 (2): 553–558. doi:10.1051/0004-6361:20064895. Bibcode2006A&A...454..553D. https://www.aanda.org/articles/aa/full/2006/29/aa4895-06/aa4895-06.html. 
  5. 5.0 5.1 5.2 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. doi:10.1051/0004-6361/201219639. Bibcode2013A&A...551A..90M. https://www.aanda.org/articles/aa/full_html/2013/03/aa19639-12/aa19639-12.html. 
  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. doi:10.1051/0004-6361/201935352. Bibcode2019A&A...625A..39S. 
  7. 7.0 7.1 Sissa, E.; Gratton, R.; Desidera, S.; Martinez Fiorenzano, A. F.; Bonfanti, A.; Carolo, E.; Vassallo, D.; Claudi, R. U. et al. (2016). "Hα-activity and ages for stars in the SARG survey". Astronomy and Astrophysics 596: A76. doi:10.1051/0004-6361/201628531. Bibcode2016A&A...596A..76S. 
  8. "HD 106515". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+106515. 
  9. "HD 106515A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+106515A. 
  10. "HD 106515B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+106515B. 
  11. 11.0 11.1 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. doi:10.1051/0004-6361/201220038. Bibcode2012A&A...546A.108D. https://www.aanda.org/articles/aa/full_html/2012/10/aa20038-12/aa20038-12.html. 
  13. 13.0 13.1 Li, Yiting; Brandt, Timothy D.; Brandt, G. Mirek; Dupuy, Trent J.; Michalik, Daniel; Jensen-Clem, Rebecca; Zeng, Yunlin; Faherty, Jacqueline et al. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal 162 (6): 266. doi:10.3847/1538-3881/ac27ab. Bibcode2021AJ....162..266L. 
  14. Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode2022ApJS..262...21F.