Astronomy:WASP-67

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Short description: Star in the constellation Sagittarius
WASP-67
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sagittarius
Right ascension  19h 42m 58.5217s[1]
Declination −19° 56′ 58.523″[1]
Apparent magnitude (V) 12.54
Characteristics
Evolutionary stage Main sequence
Spectral type K0V[2]
Astrometry
Radial velocity (Rv)0.29[1] km/s
Proper motion (μ) RA: 1.759[1] mas/yr
Dec.: −32.902[1] mas/yr
Parallax (π)5.2496 ± 0.0427[1] mas
Distance621 ± 5 ly
(190 ± 2 pc)
Details[3]
Mass0.91±0.28 M☉
Radius0.88±0.08 R☉
Surface gravity (log g)4.35±0.15 cgs
Temperature5200±100 K
Metallicity [Fe/H]−0.07 dex
Rotational velocity (v sin i)2.1±0.4[4] km/s
Age8.7+5.5
−8.6[2] Gyr
Other designations
Gaia DR2 6868476691490044672, TYC 6307-1388-1, 2MASS J19425852-1956585[5]
Database references
SIMBADdata

WASP-67 is a K-type main-sequence star about 620 light-years away. The stars age is poorly constrained, but is likely older than the Sun`s at approximately 8.7+5.5
−8.6 billion years (ie. somewhere between 100 million years and the age of the universe).[2] WASP-67 is slightly depleted in heavy elements, having 85% of the solar abundance of iron.[3]

A multiplicity survey in 2016 has found one candidate stellar companion to WASP-67 at a projected separation of 4.422″±0.018″.[6] Nonetheless, follow-up observations in 2017 failed to find any bound stellar companions.[7]

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit.[4] Its equilibrium temperature is 1050 K.[8]

The planetary atmosphere contains water, and a cloud layer is located higher than in the similar gas giant HAT-P-38b, indicating a high planetary metallicity.[8]

The WASP-67 planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.43±0.09 MJ 0.0510+0.001
−0.0008[2] 		4.61442±0.00001 0[9] 85.8±0.35° 1.15±0.11 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 2.2 2.3 Mancini, L.; Southworth, J.; Ciceri, S.; Calchi Novati, S.; Dominik, M.; Henning, Th.; Jørgensen, U. G.; Korhonen, H. et al. (2014), "Physical properties of the WASP-67 planetary system from multi-colour photometry", Astronomy & Astrophysics 568: A127, doi:10.1051/0004-6361/201424106, Bibcode: 2014A&A...568A.127M 
  3. ↑ 3.0 3.1 3.2 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, doi:10.3847/1538-3881/aa5df3, Bibcode: 2017AJ....153..136S 
  4. ↑ 4.0 4.1 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 
  5. ↑ "WASP-67". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-67. 
  6. ↑ 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 
  7. ↑ 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 
  8. ↑ 8.0 8.1 Bruno, Giovanni; Lewis, Nikole K.; Stevenson, Kevin B.; Filippazzo, Joseph; Hill, Matthew; Fraine, Jonathan D.; Wakeford, Hannah R.; Deming, Drake et al. (2018), "A COMPARATIVE STUDY OF WASP-67b AND HAT-P-38b FROM WFC3 DATA", The Astronomical Journal 155 (2): 55, doi:10.3847/1538-3881/aaa0c7, Bibcode: 2018AJ....155...55B 
  9. ↑ Kammer, Joshua A.; Knutson, Heather A.; Line, Michael R.; Fortney, Jonathan J.; Deming, Drake; Burrows, Adam; Cowan, Nicolas B.; Triaud, Amaury H. M. J. et al. (2015), "Spitzersecondary Eclipse Observations of Five Cool Gas Giant Planets and Empirical Trends in Cool Planet Emission Spectra", The Astrophysical Journal 810 (2): 118, doi:10.1088/0004-637X/810/2/118, Bibcode: 2015ApJ...810..118K 

Coordinates: Sky map 19h 42m 58.5217s, −19° 56′ 58.5230″



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