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WASP-55 is a G-type main-sequence star about 954 light-years away in the constellation Virgo. The star is much younger than the Sun at approximately 1.1+0.8
−0.6 billion years.[8] WASP-55 is similar to the Sun in concentration of heavy elements.[10]

A multiplicity survey in 2016 found one candidate stellar companion to WASP-55 at a projected separation of 4.435″±0.018″.[11] Follow-up observations in 2017 were unable to confirm if the suspected companion red dwarf star, with a temperature of 3,340±90 K, is gravitationally bound to WASP-55 or not.[12] It was confirmed in 2019 using Gaia DR2 data.[13]

Planetary system

In 2012 a transiting hot Jupiter planet, WASP-55b, was detected on a tight, circular orbit.[14] Its equilibrium temperature is 1,305 K.[5]

The WASP-55 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.62±0.04 MJ 0.0558±0.0006 4.4656291(11)[8] <0.056[7] 89.0±0.2° 1.34±0.01 RJ

References

  1. ^ Roman, Nancy G. (1987). “Identification of a constellation from a position”. Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP…99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. ^ a b c d e 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. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). “The Tycho-2 catalogue of the 2.5 million brightest stars”. Astronomy and Astrophysics. 355. Bibcode:2000A&A…355L..27H.
  4. ^ a b 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.
  5. ^ a b c d e f g Clark, B. J. M.; Anderson, D. R.; Hellier, C.; Turner, O. D.; Močnik, T. (2018). “An analysis of transiting hot Jupiters observed with K2: WASP-55b and WASP-75b”. Publications of the Astronomical Society of the Pacific. 130 (985): 034401. arXiv:1802.02132. Bibcode:2018PASP..130c4401C. doi:10.1088/1538-3873/aaa33e. S2CID 119077382.
  6. ^ Hardegree-Ullman, Kevin K.; Zink, Jon K.; Christiansen, Jessie L.; Dressing, Courtney D.; Ciardi, David R.; Schlieder, Joshua E. (2020). “Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 R⊕“. The Astrophysical Journal Supplement Series. 247 (1): 28. arXiv:2001.11511. Bibcode:2020ApJS..247…28H. doi:10.3847/1538-4365/ab7230.
  7. ^ a b Bonomo, A. S.; Desidera, S.; et al. (June 2017). “The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets”. Astronomy & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A…602A.107B. doi:10.1051/0004-6361/201629882.
  8. ^ a b c Southworth, John; et al. (2016). “High-precision photometry by telescope defocussing – VIII. WASP-22, WASP-41, WASP-42 and WASP-55”. Monthly Notices of the Royal Astronomical Society. 457 (4): 4205. arXiv:1512.05549. Bibcode:2016MNRAS.457.4205S. doi:10.1093/mnras/stw279.
  9. ^ “WASP-55”, SIMBAD, Centre de données astronomiques de Strasbourg
  10. ^ Petigura, Erik A.; Crossfield, Ian J. M.; Isaacson, Howard; Beichman, Charles A.; Christiansen, Jessie L.; Dressing, Courtney D.; Fulton, Benjamin J.; Howard, Andrew W.; Kosiarek, Molly R.; Lépine, Sébastien; Schlieder, Joshua E.; Sinukoff, Evan; Yee, Samuel W. (2018). “Planet Candidates from K2 Campaigns 5-8 and Follow-up Optical Spectroscopy”. The Astronomical Journal. 155 (1): 21. arXiv:1711.06377. Bibcode:2018AJ….155…21P. doi:10.3847/1538-3881/aa9b83.
  11. ^ Evans, D. F.; Southworth, J.; Maxted, P. F. L.; Skottfelt, J.; Hundertmark, M.; Jørgensen, U. G.; Dominik, M.; Alsubai, K. A.; Andersen, M. I.; Bozza, V.; Bramich, D. M.; Burgdorf, M. J.; Ciceri, S.; d’Ago, G.; Figuera Jaimes, R.; Gu, S.-H.; Haugbølle, T.; Hinse, T. C.; Juncher, D.; Kains, N.; Kerins, E.; Korhonen, H.; Kuffmeier, M.; Mancini, L.; Peixinho, N.; Popovas, A.; Rabus, M.; Rahvar, S.; Schmidt, R. W.; et al. (2016), “High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). I. Lucky imaging observations of 101 systems in the southern hemisphere”, Astronomy & Astrophysics, 589: A58, arXiv:1603.03274, Bibcode:2016A&A…589A..58E, doi:10.1051/0004-6361/201527970, S2CID 14215845
  12. ^ Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M.; Burgdorf, M. J.; Ciceri, S.; d’Ago, G.; Figuera Jaimes, R.; Gu, S.-H.; Hinse, T. C.; Henning, Th.; Hundertmark, M.; Kains, N.; Kerins, E.; Korhonen, H.; Kokotanekova, R.; Kuffmeier, M.; Longa-Peña, P.; Mancini, L.; MacKenzie, J.; Popovas, A.; Rabus, M.; Rahvar, S.; Sajadian, S.; Snodgrass, C.; et al. (2018), “High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016”, Astronomy & Astrophysics, 610: A20, arXiv:1709.07476, Bibcode:2018A&A…610A..20E, doi:10.1051/0004-6361/201731855, S2CID 53400492
  13. ^ Mugrauer, M. (December 2019). “Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release”. Monthly Notices of the Royal Astronomical Society. 490 (4): 5088–5102. Bibcode:2019MNRAS.490.5088M. doi:10.1093/mnras/stz2673.
  14. ^ Hellier, Coel; Anderson, D. R.; Collier Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A. M. S.; Southworth, J.; Triaud, A. H. M. J.; Udry, S.; West, R. G. (2012), “Seven transiting hot-Jupiters from WASP-South, Euler and TRAPPIST: WASP-47b, WASP-55b, WASP-61b, WASP-62b, WASP-63b, WASP-66b & WASP-67b”, Monthly Notices of the Royal Astronomical Society, 426 (1): 739–750, arXiv:1204.5095, Bibcode:2012MNRAS.426..739H, doi:10.1111/j.1365-2966.2012.21780.x, S2CID 54713354