WASP-55

WASP-55
Observationsdata
Epok: J2000.0
StjärnbildJungfrun
Rektascension13t 35m 01,9538 s[1]
Deklination-17° 30′ 12,5263 ″[1]
Skenbar magnitud ()11,75 ± 0,19[2]
Stjärntyp
SpektraltypG1 V[2]
VariabeltypPlanetpassage-variabel
Astrometri
Radialhastighet ()-4,09[1] km/s
Egenrörelse (µ)RA: +12,072[1] mas/år
Dek.: -3,837[1] mas/år
Parallax ()3,3337 ± 0,0438[1]
Avstånd980 ± 10  (300 ± 4 pc)
Detaljer
Massa1,04 ± 0,05[3] M
Radie1,11 +0,13−0,09[3] R
Temperatur5 965[3] K
Metallicitet-0,00[3]
Vinkelhastighet2,7[3] km/s
Ålder1,1 +0,8−0,6[4] miljarder år
Andra beteckningar
TYC 6125-113-1, 2MASS J13350194-1730124, RAVE J133502.0-173012, RAVE J133502.0-173013, Gaia DR1 3603529272750802560, Gaia DR3 3603529272750802560, Gaia DR2 3603529272750802560[2][5]

WASP-55 är en ensam stjärna i södra delen av stjärnbilden Jungfrun. Den har en skenbar magnitud av ca 11,75[2] och kräver ett teleskop för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 3,3 mas,[1] beräknas den befinna sig på ett avstånd på ca 980 ljusår (ca 300 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -4 km/s.[1]

Egenskaper

WASP-55 är en gul till vit stjärna i huvudserien av spektralklass G1 V.[2] Den har en massa som är ca 1,04[3] solmassa, en radie som är ca 1,11[3] solradie och har en effektiv temperatur av ca 6 000 K.[1] Stjärnan har ungefär samma koncentration av tyngre element som solen.[3]

En multiplicitetsundersökning 2016 observerade en röd dvärg som följeslagare till WASP-55 med en beräknad separation på 4,435 ± 0,018 bågsekunder.[6] Uppföljande observationer 2017 kunde dock inte bekräfta om den misstänkta följeslagaren, med en temperatur på 3 340 ± 90 K, är gravitationellt bunden till WASP-55 eller inte.[7]

Planetsystem

Exoplaneten WASP-55b av typen het Jupiter upptäcktes 2012 i omlopp kring WASP-55 i en snäv, cirkulär bana.[8] Planetens jämviktstemperatur är 1 305 +49−69.[9]

WASP-55 solsystem[10]
Planet Massa Halv storaxel
(AE)
Siderisk omloppstid
(d)
Excentricitet Inklination
Radie
b 0,62 ± 0,04 MJ 0,0558 ± 0,0006[9] 4,4656291 <0,1 89,0 ± 0,2°[9] 1,34 ± 0,01[9] RJ

Se även

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, WASP-55, 27 augusti 2021.

Noter

  1. ^ [a b c d e f g h i] 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.
  2. ^ [a b c d e] WASP-55 (unistra.fr). Hämtad 2022-12-14.
  3. ^ [a b c d e f g h] 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
  4. ^ 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
  5. ^ "WASP-55", SIMBAD, Centre de données astronomiques de Strasbourg
  6. ^ 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
  7. ^ 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
  8. ^ 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
  9. ^ [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
  10. ^ 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

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