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  • 21 Aug, 2019

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HD 86226
HD 86226 is a star with a pair of orbiting exoplanet companions, found in the constellation of Hydra. With an apparent visual magnitude of 7.93, it is too dim to be visible with the naked eye. The distance to this system has been determined by the parallax method, yielding a range of 149 light years. It is receding with a heliocentric radial velocity of +19.6 km/s. A survey in 2015 has ruled out the existence of any stellar companions at projected distances above 12 astronomical units.

This is an ordinary G-type main-sequence star with a stellar classification of G2V. It is similar in size, mass, and composition to the Sun, although it isn't considered a solar twin. The age is about the same; roughly 4.6 billion years old. The star is radiating 18% greater luminosity (compared to the Sun) from its photosphere at an effective temperature of 5,863 K. It is spinning with a projected rotational velocity of 3.6 km/s.

As of 2014, Radio emission at a frequency of 150 MHz has been tentatively detected from the proximity of this system, although it is not clear whether the star or a satellite orbiting a rapidly rotating planet is the source.

Planetary system

Due to the periodic spectrum shifts when it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star. The object discovered in 2010 had a Keplerian orbit, was declared an exoplanet and dubbed HD 86226 b. A hot Super-Earth planet called HD 86226 c was discovered in 2020. It may be undergoing considerable atmospheric mass loss.

The HD 86226 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
c 7.25
−1.12 M🜨 		0.049±0.001 3.98442±0.00018 0.075
−0.048 		86.45
−0.16° 		2.16±0.08 R🜨
b 0.45
−0.05 MJ 		2.73±0.06 1628
−21 		0.059
−0.039 		— —

See also

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. ^ 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.
  3. ^ Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  5. ^ Teske, Johanna; et al. (2020). "TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet". The Astronomical Journal. 160 (2): 96. arXiv:2007.13927. Bibcode:2020AJ....160...96T. doi:10.3847/1538-3881/ab9f95. S2CID 220830943.
  6. ^ Llorente de Andrés, F.; et al. (October 2021). "The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert". Astronomy and Astrophysics. 654: A137. arXiv:2108.05852. Bibcode:2021A&A...654A.137L. doi:10.1051/0004-6361/202141339. ISSN 0004-6361.
  7. ^ "HD 86226". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-02-10.
  8. ^ Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3): 3127–3136. Bibcode:2015MNRAS.450.3127M. doi:10.1093/mnras/stv771. hdl:1887/49340. Retrieved 19 June 2020.
  9. ^ Datson, Juliet; et al. (February 2015). "Spectroscopic study of solar twins and analogues". Astronomy & Astrophysics. 574: 12. arXiv:1412.8168. Bibcode:2015A&A...574A.124D. doi:10.1051/0004-6361/201425000. S2CID 53708062. A124.
  10. ^ Sirothia, S. K.; et al. (February 2014). "Search for 150 MHz radio emission from extrasolar planets in the TIFR GMRT Sky Survey". Astronomy & Astrophysics. 562: 9. Bibcode:2014A&A...562A.108S. doi:10.1051/0004-6361/201321571. A108.
  11. ^ Arriagada, Pamela; et al. (2010). "Five Long-period Extrasolar Planets in Eccentric orbits from the Magellan Planet Search Program". The Astrophysical Journal. 711 (2): 1229–1235. arXiv:1001.4093. Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229. S2CID 118682009.
  12. ^ Gupta, Akash; Schlichting, Hilke E. (July 2021). "Caught in the act: core-powered mass-loss predictions for observing atmospheric escape". Monthly Notices of the Royal Astronomical Society. 504 (3): 4634–4648. arXiv:2103.08785. Bibcode:2021MNRAS.504.4634G. doi:10.1093/mnras/stab1128.
  13. ^ Marmier, M.; et al. (March 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. S2CID 59467665.


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