WASP-19

WASP-19 / Wattle

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Vela[1]
Right ascension	09^h 53^m 40.07656^s[2]
Declination	−45° 39′ 33.0572″[2]
Apparent magnitude (V)	12.312 ± 0.017[3]
Characteristics
Spectral type	G8V
Apparent magnitude (B)	13.58
Apparent magnitude (R)	12.17
Apparent magnitude (I)	11.35
Apparent magnitude (J)	10.911 ± 0.026[4]
Apparent magnitude (H)	10.602 ± 0.022[4]
Apparent magnitude (K)	10.481 ± 0.023[4]
B−V color index	1.3
V−R color index	0.1
R−I color index	0.82
Variable type	planetary transit
Astrometry
Radial velocity (Rv)	21.41±0.95[2] km/s
Proper motion (μ)	RA: −35.457 mas/yr[2] Dec.: 17.378 mas/yr[2]
Parallax (π)	3.7516 ± 0.0090 mas[2]
Distance	869 ± 2 ly (266.6 ± 0.6 pc)
Absolute magnitude (MV)	5.3
Details[5]
Mass	0.97±0.02[6] M☉
Radius	0.885^+0.086 −0.084 R☉
Luminosity	0.71 L☉
Surface gravity (log g)	4.45 ± 0.05[7] cgs
Temperature	5568 ± 71[7] K
Metallicity [Fe/H]	0.15 ± 0.07[7] dex
Rotation	11.76±0.09 d
Rotational velocity (v sin i)	4.0 ± 1.0[7] km/s
Age	9.95±2.49 Gyr
Other designations
Wattle, TOI-655, WASP-19, GSC 08181-01711, 2MASS J09534008-4539330, USNO-B1.0 0443-00193111
Database references
SIMBAD	data

WASP-19, formally named Wattle,[8] is a magnitude 12.3 star about 869 light-years (266 parsecs) away, located in the Vela constellation of the southern hemisphere.[9] This star has been found to host a transiting hot Jupiter-type planet in tight orbit.

WASP-19 is older than the Sun, has a fraction of heavy elements above the solar abundance, and is rotating rapidly, being spun up by the tides raised by the giant planet on a close orbit.[5]

Nomenclature

The designation WASP-19 indicates that this was the 19th star found to have a planet by the Wide Angle Search for Planets.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[10] The approved names were proposed by a team from Brandon Park Primary School in Wheelers Hill (Melbourne, Australia), led by scientist Lance Kelly and teacher David Maierhofer [11] and announced in June 2023. WASP-19 is named "Wattle" and its planet is named "Banksia", after the plant genera Wattle (specifically the golden wattle Acacia pycnantha) and Banksia (specifically the scarlet banksia Banksia coccinea) respectively.[8]

Planetary system

In December 2009, the SuperWASP project announced that a hot Jupiter type exoplanet, WASP-19b, was orbiting very close to this star and with the shortest orbital period of any transiting exoplanet known at the time.[9]

The WASP-19 planetary system[12][6]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b / Banksia	1.168±0.023 MJ	0.01634 ± 0.00019	0.7888396 ± 0.00000010	0	78.76 ± 0.13°	1.18±0.12 RJ

See also

• List of extrasolar planets

References

1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
3. Maxted, P. F. L.; et al. (2011). "UBV(RI)C photometry of transiting planet hosting stars". Monthly Notices of the Royal Astronomical Society. 418 (2): 1039–1042. arXiv:1108.0349. Bibcode:2011MNRAS.418.1039M. doi:10.1111/j.1365-2966.2011.19554.x. S2CID 117056033.
4. Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. ISSN 0004-6256. S2CID 18913331. Vizier catalog entry
5. Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars", Astronomy & Astrophysics, 577: A90, arXiv:1503.09111, Bibcode:2015A&A...577A..90M, doi:10.1051/0004-6361/201525774, S2CID 53324330
6. Dragomir, Diana; Kane, Stephen R.; Pilyavsky, Genady; Mahadevan, Suvrath; Ciardi, David R.; Zachary Gazak, J.; Gelino, Dawn M.; Payne, Alan; Rabus, Markus; Ramirez, Solange V.; von Braun, Kaspar; Wright, Jason T.; Wyatt, Pamela (2011). "Terms Photometry of Known Transiting Exoplanets". The Astronomical Journal. 142 (4): 115. arXiv:1108.2308. Bibcode:2011AJ....142..115D. doi:10.1088/0004-6256/142/4/115. S2CID 118606598.
7. Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. S2CID 16580774.
8. "2022 Approved Names". nameexoworlds.iau.org. IAU. Retrieved 7 June 2023.
9. Hebb, L.; et al. (2010). "WASP-19b: The Shortest Period Transiting Exoplanet Yet Discovered". The Astrophysical Journal. 708 (1): 224–231. arXiv:1001.0403. Bibcode:2010ApJ...708..224H. doi:10.1088/0004-637X/708/1/224. S2CID 119189785.
10. "List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
11. "Facebook". www.facebook.com.
12. Mancini, L.; et al. (2013). "Physical properties, transmission and emission spectra of the WASP-19 planetary system from multi-colour photometry". Monthly Notices of the Royal Astronomical Society. 436 (1): 2–18. arXiv:1306.6384. Bibcode:2013MNRAS.436....2M. doi:10.1093/mnras/stt1394. S2CID 55455709.