V830 Tauri

From Wikipedia, the free encyclopedia
V830 Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 33m 10.033s[1]
Declination +24° 33′ 43.38″[1]
Apparent magnitude (V) 12.08 - 12.37[2]
Characteristics
Evolutionary stage T Tau[3]
Spectral type M0-1[4]
Variable type BY Dra[2]
Astrometry
Radial velocity (Rv)13.45[5] km/s
Proper motion (μ) RA: 7.247[5] mas/yr
Dec.: -21.230[5] mas/yr
Parallax (π)7.6571 ± 0.0409[5] mas
Distance426 ± 2 ly
(130.6 ± 0.7 pc)
Details[3]
Mass1.00±0.05 M☉
Radius2.0±0.2 R☉
Luminosity1.2 L☉
Temperature4,250±50 K
Rotation2.741 days
Rotational velocity (v sin i)30.5±0.5 km/s
Age~2 Myr
Other designations
V830 Tauri, IRAS C04301+2427, 2MASS J04331003+2433433
Database references
SIMBADdata

V830 Tauri is a star located 427 light-years (or 131 parsecs) away from the Sun in the constellation Taurus.[6] This star is very young, with an age of only 2 million years,[6][7] compared to the Sun's age, which is 4.6 billion years. Typical for a young stars, it exhibits a strong flare activity, with three flared detected in 91-days observation period in 2016.[8]

Characteristics[]

V830 Tauri is an M-type star.[6] The star has a mass of roughly 1 solar mass, but has a radius of 2 solar radii,[6][7] due to the star's age, which means that it hasn't fully contracted yet to become a main-sequence star. It has a surface temperature of 4,250 K.[6][7] For comparison, the Sun's surface temperature is 5,772 K.

V830 Tauri is a T Tauri star, a pre-main sequence star that has a surrounding disc producing emission lines in its spectrum. It is classified as a weak-lined T Tauri star.[3] It is also classified as a BY Draconis variable, cool stars with starspots and chromospheric activity that vary in brightness as they rotate.[2] The variable period of 2.74 days matches the rotation period.[3]

Planetary system[]

Main article: V830 Tauri b

On June 20, 2016, an exoplanet was found via radial velocity.[6][7] It is one of the if not the youngest exoplanet ever found. The exoplanet has a mass of about 0.77 masses of Jupiter and is orbiting 0.057 AU away from its host star with a period of 4.93 d and an inclination of 55°.[6][7]

The V830 Tauri planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.77±0.15 MJ 0.057±0.001 4.93±0.05 0 55° —

References[]

  1. ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  2. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. ^ a b c d e Donati, J. F.; Moutou, C.; Malo, L.; Baruteau, C.; Yu, L.; Hébrard, E.; Hussain, G.; Alencar, S.; Ménard, F.; Bouvier, J.; Petit, P.; Takami, M.; Doyon, R.; Cameron, A. Collier (2016). "A hot Jupiter orbiting a 2-million-year-old solar-mass T Tauri star". Nature. 534 (7609): 662–6. arXiv:1606.06236. Bibcode:2016Natur.534..662D. doi:10.1038/nature18305. PMID 27324847.
  4. ^ Strassmeier, Klaus G. (2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv..17..251S. doi:10.1007/s00159-009-0020-6.
  5. ^ a b c d 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.
  6. ^ a b c d e f g "The Extrasolar Planet Encyclopaedia — V830 Tau b". exoplanet.eu. Retrieved 2017-07-30.
  7. ^ a b c d e "V830 Tau b". exoplanetarchive.ipac.caltech.edu. Retrieved 2017-07-30.
  8. ^ The hot Jupiter of the magnetically-active weak-line T Tauri star V830 Tau, 2016, arXiv:1611.02055
Retrieved from ""