HD 106315

HD 106315, also known as K2-109, is a F-type main-sequence star about 340 light-years away. The star is relatively metal-poor, having 60% of solar concentration of iron.[5]

HD 106315
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 13m 53.3962s[1]
Declination −00° 23′ 36.5534″[1]
Apparent magnitude (V) 8.951[2]
Characteristics
Evolutionary stage Main sequence
Spectral type F5V[3]
B−V color index 0.45[2]
Astrometry
Radial velocity (Rv)−3.2±0.3[4] km/s
Proper motion (μ) RA: −2.36±0.03[4] mas/yr[4]
Dec.: 11.943±0.019[4] mas/yr[4]
Parallax (π)9.1725 ± 0.0221 mas[4]
Distance355.6 ± 0.9 ly
(109.0 ± 0.3 pc)
Details[5]
Mass1.154±0.042 M☉
Radius1.269±0.024 R☉
Surface gravity (log g)4.291±0.025 cgs
Temperature6364±87 K
Metallicity [Fe/H]−0.22±0.09 dex
Other designations
BD+00 2910, TYC 4940-868-1, GSC 04940-00868, 2MASS J12135339-0023365, K2-109, Gaia DR3 3698307419878650240[1]
Database references
SIMBADdata

Multiplicity surveys did not detect any stellar companions to HD 106315 by 2020.[5]

Planetary system

Two planets were detected by transit method in 2017.[6] The large planetary radii imply both planets have a massive steam atmosphere for planet b and hydrogen-helium atmosphere for planet c.[5] The planetary system of HD 106315 is rather unstable and current planetary orbits are the outcome of violent dynamical history,[7] strongly affected by relativistic effects.[8] The orbits of planets are nearly coplanar, and orbit of c is well aligned with the equatorial plane of the star, misalignment been equal to -10+3.6
−3.8°.[9]

Since 2017, third outer planet with mass above 45M🜨 is suspected to exist in the system.[2]

The HD 106315 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 10.5±3.1[5] M🜨 0.0924+0.0011
−0.0012		 9.55288±0.00021 0 87.6+3.0
−1.7°		 2.4±0.2 R🜨
c 12.0±3.8[5] M🜨 0.1565+0.0019
−0.0020		 21.05652±0.00012 0 88.89+0.69
−0.51°		 4.379±0.086 R🜨

References
  1. "HD 106315", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 26 July 2022
  2. Crossfield, Ian J. M.; Ciardi, David R.; Isaacson, Howard; Howard, Andrew W.; Petigura, Erik A.; Weiss, Lauren M.; Fulton, Benjamin J.; Sinukoff, Evan; Schlieder, Joshua E.; Mawet, Dimitri; Ruane, Garreth; De Pater, Imke; De Kleer, Katherine; Davies, Ashley G.; Christiansen, Jessie L.; Dressing, Courtney D.; Hirsch, Lea; Benneke, Björn; Crepp, Justin R.; Kosiarek, Molly; Livingston, John; Gonzales, Erica; Beichman, Charles A.; Knutson, Heather A. (2017). "Two Small Transiting Planets and a Possible Third Body Orbiting HD 106315". The Astronomical Journal. 153 (6): 255. arXiv:1701.03811. Bibcode:2017AJ....153..255C. doi:10.3847/1538-3881/aa6e01. S2CID 55601944.
  3. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  4. 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.
  5. Kosiarek, Molly R.; et al. (2021). "Physical Parameters of the Multiplanet Systems HD 106315 and GJ 9827". The Astronomical Journal. 161 (1): 47. arXiv:2009.03398. Bibcode:2021AJ....161...47K. doi:10.3847/1538-3881/abca39. S2CID 221534625.
  6. Rodriguez, Joseph E.; Zhou, George; Vanderburg, Andrew; Eastman, Jason D.; Kreidberg, Laura; Cargile, Phillip A.; Bieryla, Allyson; Latham, David W.; Irwin, Jonathan; Mayo, Andrew W.; Calkins, Michael L.; Esquerdo, Gilbert A.; Mink, Jessica (2017). "A Multi-planet System Transiting the V = 9 Rapidly Rotating F-Star HD 106315". The Astronomical Journal. 153 (6): 256. arXiv:1701.03807. Bibcode:2017AJ....153..256R. doi:10.3847/1538-3881/aa6dfb. S2CID 118983037.
  7. Turrini, D.; Zinzi, A.; Belinchon, J. A. (2020). "Normalized angular momentum deficit: A tool for comparing the violence of the dynamical histories of planetary systems". Astronomy and Astrophysics. 636: A53. arXiv:2003.05366. Bibcode:2020A&A...636A..53T. doi:10.1051/0004-6361/201936301. S2CID 212657397.
  8. Marzari, F.; Nagasawa, M. (2020). "Secular evolution of close-in planets: The effects of general relativity". Monthly Notices of the Royal Astronomical Society. 493 (1): 427. arXiv:2001.09801. Bibcode:2020MNRAS.493..427M. doi:10.1093/mnras/staa271.
  9. Zhou, George; Rodriguez, Joseph E.; Vanderburg, Andrew; Quinn, Samuel N.; Irwin, Jonathan; Huang, Chelsea X.; Latham, David W.; Bieryla, Allyson; Esquerdo, Gilbert A.; Berlind, Perry; Calkins, Michael L. (2018). "The Warm Neptunes around HD 106315 Have Low Stellar Obliquities". The Astronomical Journal. 156 (3): 93. arXiv:1807.00024. Bibcode:2018AJ....156...93Z. doi:10.3847/1538-3881/aad085. S2CID 118864208.
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