WASP-45

WASP-45 is a K-type main-sequence star about 690 light-years away. The star age cannot be well constrained, but it is probably older than Sun. Yet, WASP-45 is enriched in heavy elements compared to Sun, having 240% of solar abundance.[2]

WASP-45
Observation data
Epoch J2000      Equinox J2000
Constellation Sculptor
Right ascension 00h 20m 56.9940s[1]
Declination −35° 59′ 53.747″[1]
Apparent magnitude (V) 11.8
Characteristics
Spectral type K2V
Astrometry
Radial velocity (Rv)4.95[1] km/s
Proper motion (μ) RA: 52.895[1] mas/yr
Dec.: −46.877[1] mas/yr
Parallax (π)4.7064 ± 0.039 mas[1]
Distance693 ± 6 ly
(212 ± 2 pc)
Details[2]
Mass0.932+0.045
−0.046 M☉
Radius0.891±0.013 R☉
Luminosity0.510±0.013 L☉
Surface gravity (log g)4.508+0.023
−0.025 cgs
Temperature5140±200 K
Metallicity [Fe/H]0.388+0.09
−0.10 dex
Rotational velocity (v sin i)2.3±0.7 km/s
Age5.4+4.7
−3.5 Gyr
Other designations
Gaia DR2 2308834780352875904, TYC 6996-583-1, GSC 06996-00583, 2MASS J00205699-3559537[3]
Database references
SIMBADdata

The star has low ultraviolet emission, therefore suspected to have a low starspot activity,[4] although chromospheric activity was reported elsewhere.[5]

Planetary system

In 2011 a transiting hot Jupiter planet b was detected.[5] The planet equilibrium temperature is 1170±24 K. No Rayleigh scattering was detected in planetary atmosphere, implying existence of hazes or high cloud deck.[6]

The WASP-45 planetary system[6][2]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 1.018+0.046
−0.045 MJ		 0.0405±0.0001 3.126090+0.000037
−0.000036		 0.048+0.034
−0.029		 84.686±0.098° 0.978+0.026
−0.024 RJ

References
  1. 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. Addison, Brett; Wright, Duncan J.; Wittenmyer, Robert A.; Horner, Jonathan; Mengel, Matthew W.; Johns, Daniel; Marti, Connor; Nicholson, Belinda; Okumura, Jack; Bowler, Brendan; Crossfield, Ian; Kane, Stephen R.; Kielkopf, John; Plavchan, Peter; Tinney, C. G.; Zhang, Hui; Clark, Jake T.; Clerte, Mathieu; Eastman, Jason D.; Swift, Jon; Bottom, Michael; Muirhead, Philip; McCrady, Nate; Herzig, Erich; Hogstrom, Kristina; Wilson, Maurice; Sliski, David; Johnson, Samson A.; Wright, Jason T.; et al. (2019), "MINERVA-Australis I: Design, Commissioning, & First Photometric Results", Publications of the Astronomical Society of the Pacific, 131 (1005): 115003, arXiv:1901.11231, Bibcode:2019PASP..131k5003A, doi:10.1088/1538-3873/ab03aa, S2CID 119370785
  3. WASP-45 -- High proper-motion Star
  4. Shkolnik, Evgenya L. (2013), "An Ultraviolet Investigation of Activity on Exoplanet Host Stars", The Astrophysical Journal, 766 (1): 9, arXiv:1301.6192, Bibcode:2013ApJ...766....9S, doi:10.1088/0004-637X/766/1/9, S2CID 118415788
  5. Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Smith, A. M. S.; Triaud, A. H. M. J.; West, R. G.; Pepe, F.; Pollacco, D.; Ségransan, D.; Todd, I.; Udry, S. (2012), "WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets", Monthly Notices of the Royal Astronomical Society, 422 (3): 1988–1998, arXiv:1105.3179, Bibcode:2012MNRAS.422.1988A, doi:10.1111/j.1365-2966.2012.20635.x, S2CID 34406657
  6. Ciceri, S.; Mancini, L.; Southworth, J.; Lendl, M.; Tregloan-Reed, J.; Brahm, R.; Chen, G.; d'Ago, G.; Dominik, M.; Figuera Jaimes, R.; Galianni, P.; Harpsøe, K.; Hinse, T. C.; Jørgensen, U. G.; Juncher, D.; Korhonen, H.; Liebig, C.; Rabus, M.; Bonomo, A. S.; Bott, K.; Henning, Th.; Jordán, A.; Sozzetti, A.; Alsubai, K. A.; Andersen, J. M.; Bajek, D.; Bozza, V.; Bramich, D. M.; Browne, P.; et al. (2016), "Physical properties of the planetary systems WASP-45 and WASP-46 from simultaneous multi-band photometry", Monthly Notices of the Royal Astronomical Society, 456 (1): 990–1002, arXiv:1511.05171, Bibcode:2016MNRAS.456..990C, doi:10.1093/mnras/stv2698, S2CID 14670311


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