Astronomy:WASP-55

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Short description: Star in constellation of Virgo
WASP-55
Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo
Right ascension  13h 35m 01.9538s[1]
Declination −17° 30′ 12.5263″[1]
Apparent magnitude (V) 11.75
Characteristics
Evolutionary stage Main sequence[citation needed]
Spectral type G1
Astrometry
Radial velocity (Rv)-4.09[1] km/s
Proper motion (μ) RA: 12.072[1] mas/yr
Dec.: −3.837[1] mas/yr
Parallax (π)3.3337 ± 0.0438[1] mas
Distance980 ± 10 ly
(300 ± 4 pc)
Details[2]
Mass1.04±0.05 M☉
Radius1.11+0.13
−0.09 R☉
Surface gravity (log g)4.34 cgs
Temperature5,965 K
Metallicity [Fe/H]0.00 dex
Rotational velocity (v sin i)2.7 km/s
Age1.1+0.8
−0.6[3] Gyr
Other designations
Gaia DR2 3603529272750802560, EPIC 212300977, TYC 6125-113-1, 2MASS J13350194-1730124[4]
Database references
SIMBADdata

WASP-55 is a G-type main-sequence star about 980 light-years away. The star is much younger than the Sun at approximately 1.1+0.8
−0.6 billion years.[3] WASP-55 is similar to the Sun in concentration of heavy elements.[2]

A multiplicity survey in 2016 found one candidate stellar companion to WASP-55 at a projected separation of 4.435″±0.018″.[5] 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.[6]

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit.[7] Its equilibrium temperature is 1,305 K.[8]

The WASP-55 planetary system[9]
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[8] 4.4656291 <0.1 89.0±0.2[8]° 1.34±0.01[8] RJ

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 Petigura, Erik A.; Crossfield, Ian J. M.; Isaacson, Howard; Beichman, Charles A.; Christiansen, Jessie L.; Dressing, Courtney D.; Fulton, Benjamin J.; Howard, Andrew W. et al. (2017), "PLANET CANDIDATES FROM K2 CAMPAIGNS 5–8 AND FOLLOW-UP OPTICAL SPECTROSCOPY", The Astronomical Journal 155: 21, doi:10.3847/1538-3881/aa9b83 
  3. ↑ 3.0 3.1 Southworth, John; Tregloan-Reed, J.; Andersen, M. I.; Calchi Novati, S.; Ciceri, S.; Colque, J. P.; D'Ago, G.; Dominik, M. et al. (2015), High-precision photometry by telescope defocussing. VIII. WASP-22, WASP-41, WASP-42 and WASP-55, doi:10.1093/mnras/stw279 
  4. ↑ "WASP-55". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-55. 
  5. ↑ Evans, D. F.; Southworth, J.; Maxted, P. F. L.; Skottfelt, J.; Hundertmark, M.; Jørgensen, U. G.; Dominik, M.; Alsubai, K. A. 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, doi:10.1051/0004-6361/201527970, Bibcode: 2016A&A...589A..58E 
  6. ↑ Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M. et al. (2018), "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016", Astronomy & Astrophysics 610: A20, doi:10.1051/0004-6361/201731855, Bibcode: 2018A&A...610A..20E 
  7. ↑ Hellier, Coel; Anderson, D. R.; Collier Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Jehin, E.; Lendl, M. et al. (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, doi:10.1111/j.1365-2966.2012.21780.x, Bibcode: 2012MNRAS.426..739H 
  8. ↑ 8.0 8.1 8.2 8.3 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, doi:10.1088/1538-3873/aaa33e, Bibcode: 2018PASP..130c4401C 
  9. ↑ Sandford, Emily; Espinoza, Néstor; Brahm, Rafael; Jordán, Andrés (2019), "Estimation of singly-transiting K2 planet periods with Gaia parallaxess", Monthly Notices of the Royal Astronomical Society 489 (3): 3149–3161, doi:10.1093/mnras/stz2348, Bibcode: 2019MNRAS.489.3149S 

Coordinates: Sky map 13h 35m 01.9538s, −17° 30′ 12.5263″



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