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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| Distance | 980 ± 10 ly (300 ± 4 pc) |
| Details[2] | |
| Mass | 1.04±0.05 M☉ |
| Radius | 1.11+0.13 −0.09 R☉ |
| Surface gravity (log g) | 4.34 cgs |
| Temperature | 5,965 K |
| Metallicity [Fe/H] | 0.00 dex |
| Rotational velocity (v sin i) | 2.7 km/s |
| Age | 1.1+0.8 −0.6[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
editIn 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit.[7] Its equilibrium temperature is 1,305 K.[8]
| 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
edit- ^ a b c d e f 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.
- ^ a b 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. (2017), "PLANET CANDIDATES FROM K2 CAMPAIGNS 5–8 AND FOLLOW-UP OPTICAL SPECTROSCOPY", The Astronomical Journal, 155: 21, arXiv:1711.06377, doi:10.3847/1538-3881/aa9b83, S2CID 55674757
- ^ a b Southworth, John; Tregloan-Reed, J.; Andersen, M. I.; Calchi Novati, S.; Ciceri, S.; Colque, J. P.; D'Ago, G.; Dominik, M.; Evans, D.; Gu, S. -H.; Herrera-Cruces, A.; Hinse, T. C.; Jorgensen, U. G.; Juncher, D.; Kuffmeier, M.; Mancini, L.; Peixinho, N.; Popovas, A.; Rabus, M.; Skottfelt, J.; Tronsgaard, R.; Unda-Sanzana, E.; Wang, X. -B.; Wertz, O.; Alsubai, K. A.; Andersen, J. M.; Bozza, V.; Bramich, D. M.; Burgdorf, M.; et al. (2015), High-precision photometry by telescope defocussing. VIII. WASP-22, WASP-41, WASP-42 and WASP-55, arXiv:1512.05549, doi:10.1093/mnras/stw279
- ^ "WASP-55", SIMBAD, Centre de données astronomiques de Strasbourg
- ^ 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
- ^ 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
- ^ 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
- ^ a b c d 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
- ^ 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, arXiv:1908.08548, Bibcode:2019MNRAS.489.3149S, doi:10.1093/mnras/stz2348