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HD 222155

Coordinates: Sky map 23h 38m 00.3072s, +48° 59′ 47.4865″
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HD 222155
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda[1]
Right ascension 23h 38m 00.30719s[2]
Declination +48° 59′ 47.4874″[2]
Apparent magnitude (V) 7.1[3]
Characteristics
Evolutionary stage subgiant[2]
Spectral type G0[4]
Astrometry
Radial velocity (Rv)−44.00±0.12[2] km/s
Proper motion (μ) RA: 195.306 mas/yr[2]
Dec.: -117.335 mas/yr[2]
Parallax (π)19.8020±0.0160 mas[2]
Distance164.7 ± 0.1 ly
(50.50 ± 0.04 pc)
Absolute magnitude (MV)+3.66[1]
Details
Mass1.0±0.1[5] M☉
Radius1.8±0.1[5] R☉
Luminosity3.2±0.1[5] L☉
Surface gravity (log g)3.93±0.08[5] cgs
Temperature5,741±133[5] K
Metallicity [Fe/H]−0.22±0.04[6] dex
Rotation10.08 days[4]
Rotational velocity (v sin i)3.8[7] km/s
Age8.0±0.4[6] Gyr
Other designations
BD+48 4112, Gaia DR2 1943363751009454976, HD 222155, HIP 116616, SAO 53211, TYC 3646-2286-1, 2MASS J23380027+4859475[8]
Database references
SIMBADdata

HD 222155 is a star in the northern constellation of Andromeda.[8] It is a yellow star that can be viewed with binoculars or a small telescope, but is too faint to be seen with the naked eye at an apparent visual magnitude of 7.1. The imaging survey in 2017 did not detect any stellar companions to HD 222155.[9]

This is a G-type star with a stellar classification of G0.[4] It has exhausted the hydrogen fuel in its core and begun to evolve towards a red giant; it is currently on the subgiant branch. It has begun to expand its gaseous envelope, having a radius of 1.8 R☉ with a mass almost the same as the Sun's[5] The star is relatively depleted of heavy elements, having about 80% of solar abundance, and has weak yet noticeable ultraviolet flare activity.[10][11]

Planetary system

[edit]

Based on radial velocity data gathered in 2007–2011, the discovery of a superjovian planet b outside the habitable zone[12] was announced in May 2012.[3] The stellar and planetary parameters were refined in 2016.[13] In 2023, the inclination and true mass of HD 222155 b were measured via astrometry.[14]

The HD 222155 planetary system[14]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 2.1+0.3
−0.2 MJ 		4.7±0.1 3470+102
−106 		0.34±0.09 66+14
−11 or 115+13
−16° 		—

References

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  1. ^ a b 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. XHIP record for this object at VizieR.
  2. ^ a b c d e f 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. ^ a b Boisse, Isabelle; Pepe, Francesco; Perrier, Christian; Queloz, Didier; Bonfils, Xavier; Bouchy, François; Santos, Nuno C.; Arnold, Luc; Beuzit, Jean-Luc; Dìaz, Rodrigo F.; Delfosse, Xavier; Eggenberger, Anne; Ehrenreich, David; Forveille, Thierry; Hébrard, Guillaume; Lagrange, Anne-Marie; Lovis, Christophe; Mayor, Michel; Moutou, Claire; Naef, Dominique; Santerne, Alexandre; Ségransan, Damien; Sivan, Jean-Pierre; Udry, Stéphane (2012). "The SOPHIE search for northern extrasolar planets V. Follow-up of ELODIE candidates: Jupiter-analogs around Sun-like stars". Astronomy and Astrophysics. 545: A55. arXiv:1205.5835. Bibcode:2012A&A...545A..55B. doi:10.1051/0004-6361/201118419. S2CID 119109836.
  4. ^ a b c Llorente De Andrés, F.; de la Reza, R.; Cruz, P.; Cuenda-Muñoz, D.; Alfaro, E. J.; Chavero, C.; Cifuentes, C. (2024). "The evolution of lithium in FGK dwarf stars. Influence of planets and Galactic migration". Astronomy and Astrophysics. 684. arXiv:2402.01315. Bibcode:2024A&A...684A..28L. doi:10.1051/0004-6361/202346744.
  5. ^ a b c d e f Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  6. ^ a b Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (2018). "Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert". Astronomy and Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209.
  7. ^ Llorente De Andrés, F.; Chavero, C.; de la Reza, R.; Roca-Fàbrega, S.; Cifuentes, C. (2021). "The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert". Astronomy and Astrophysics. 654. arXiv:2108.05852. Bibcode:2021A&A...654A.137L. doi:10.1051/0004-6361/202141339.
  8. ^ a b "HD 222155". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 September 2020.
  9. ^ Wittrock, Justin M.; Kane, Stephen R.; Horch, Elliott P.; Howell, Steve B.; Ciardi, David R.; Everett, Mark E. (2017). "Exclusion of Stellar Companions to Exoplanet Host Stars". The Astronomical Journal. 154 (5): 184. arXiv:1709.05315v1. Bibcode:2017AJ....154..184W. doi:10.3847/1538-3881/aa8d69. S2CID 55789971.
  10. ^ Shkolnik, Evgenya L. (2013). "An Ultraviolet Investigation of Activity on Exoplanet Host Stars". The Astrophysical Journal. 766 (1): 9. arXiv:1301.6192. Bibcode:2013ApJ...766....9S. doi:10.1088/0004-637X/766/1/9.
  11. ^ Viswanath, Gayathri; Narang, Mayank; Manoj, P.; Mathew, Blesson; Kartha, Sreeja S. (2020). "A statistical search for Star-Planet Interaction in the UltraViolet using GALEX". The Astronomical Journal. 159 (5): 194. arXiv:2003.03349v1. Bibcode:2020AJ....159..194V. doi:10.3847/1538-3881/ab7d3b. S2CID 212628609.
  12. ^ Kokaia, Giorgi; Davies, Melvyn B.; Mustill, Alexander J. (2020). "Resilient habitability of nearby exoplanet systems". Monthly Notices of the Royal Astronomical Society. 492 (1): 352–368. arXiv:1910.07573. Bibcode:2020MNRAS.492..352K. doi:10.1093/mnras/stz3408. S2CID 204743669.
  13. ^ Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2016). "Accurate empirical radii and masses of planets and their host stars with Gaia parallaxes". The Astronomical Journal. 153 (3): 136. arXiv:1609.04389. Bibcode:2017AJ....153..136S. doi:10.3847/1538-3881/aa5df3. S2CID 119219062.
  14. ^ a b Philipot, F.; Lagrange, A.-M.; et al. (January 2023). "Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry". Astronomy & Astrophysics. 670: A65. arXiv:2301.01263. Bibcode:2023A&A...670A..65P. doi:10.1051/0004-6361/202245396. S2CID 255393653.
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