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V830 Tauri

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V830 Tauri

Alight curvefor V830 Tauri, plotted fromTESSdata[1]
Observation data
EpochJ2000.0EquinoxJ2000.0
Constellation Taurus
Right ascension 04h33m10.03006s[2]
Declination +24° 33′ 43.2555″[2]
Apparent magnitude(V) 12.08 - 12.37[3]
Characteristics
Evolutionary stage T Tau[4]
Spectral type M0-1[5]
Variable type BY Dra[3]
Astrometry
Radial velocity(Rv)5.98±11.60[2]km/s
Proper motion(μ)RA:7.171±0.022mas/yr[2]
Dec.:−21.197±0.017mas/yr[2]
Parallax(π)7.6704 ± 0.0165mas[2]
Distance425.2 ± 0.9ly
(130.4 ± 0.3pc)
Details[4]
Mass1.00±0.05M☉
Radius2.0±0.2R☉
Luminosity1.2L☉
Temperature4,250±50K
Rotation2.741 days
Rotational velocity(vsini)30.5±0.5km/s
Age~2Myr
Other designations
V830 Tauri,IRASC04301+2427,2MASSJ04331003+2433433
Database references
SIMBADdata

V830 Tauriis aT Tauri starlocated 425.2light-years(130.4pc) away from theSunin the constellationTaurus.[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 strong flare activity, with three flares detected during a 91-day observation period in 2016.[8]

Characteristics

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V830 Tauri is anM-type star.[6]The star has a mass of roughly 1solar mass,but has a radius of 2solar radii,[6][7]due to the star's age, which means that it hasn't fully contracted yet to become amain-sequence star.(It will likely be on the main sequence portion of its lifetime for about 10 billion years, much like the Sun.) It has a surface temperature of4,250 K.[6][7]For comparison, the Sun's surface temperature is5,772 K.

V830 Tauri is a weak-linedT Tauri star,a pre-main sequence star that has a surrounding disc producing emission lines in its spectrum.[4]It is also classified as aBY Draconis variable,cool stars with starspots and chromospheric activity that vary in brightness as they rotate.[3]The variable period of 2.74 days matches the rotation period.[4]

Planetary system

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The V830 Tauri planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b(controversial) 0.77±0.15MJ 0.057±0.001 4.93±0.05 0 55° —

On June 20, 2016, an exoplanet was found around V830 Tauri viaradial velocity.[6][7]It is one of, if not the youngest exoplanet ever found, with an age of only about 2 million years.[9][10][11]The exoplanet has amassof about 0.77 masses ofJupiterand is orbiting0.057AUaway from its host star with aperiodof4.93dand aninclinationof55°.[6][7]However, a 2020 study was unable to confirm this planet.[12][13][note 1]

V830 Tauri b orbits its parent star every 4.93 days at a distance of 0.057AUfrom its parent star.[14]This is about 7x closer to the host star than the planetMercuryis to theSun.Its mass is about 70% that ofJupiter,and, because it is orbiting very close to its parent star, it is classified as ahot Jupiter.

Previously, before the discovery of V830 Tauri b (and a slightly older planet namedK2-33b,with an age around 5-10 million years),TW Hya bwas discovered and disproven andPTFO 8-8695 b / CVSO 30 bwas discovered with an age equally young and an orbit even closer. The yet unconfirmed objects are pending confirmation.[4]The discovery of V830 Tauri b, K2-33b and PTFO 8-8695 b / CVSO 30 b suggests that the formation and migration of close-in giant planets can occur on a timescale of only a few million years. The new discoveries support planet-disc interactions as the most likely mechanism for efficiently producing young hot Jupiters.[4]

Notes

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  1. ^Works by Donati claims to detect 0.068km/s radial-velocity planetary signal embedded within 1.2km/s jitter, based only on 27 radial-velocity measurements.

References

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  1. ^"MAST: Barbara A. Mikulski Archive for Space Telescopes".Space Telescope Science Institute.Retrieved8 December2021.
  2. ^abcdeVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData 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.S2CID244398875. Gaia DR3 record for this sourceatVizieR.
  3. ^abcSamus, 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.
  4. ^abcdefgDonati, 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.PMID27324847.S2CID1046761.
  5. ^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.
  6. ^abcdefg"The Extrasolar Planet Encyclopaedia — V830 Tau b".Extrasolar Planets Encyclopaedia.Retrieved2017-07-30.
  7. ^abcde"V830 Tau b".exoplanetarchive.ipac.caltech.edu.Retrieved2017-07-30.
  8. ^Donati, J.-F.; Yu, L.; Moutou, C.; Cameron, A. C.; Malo, L.; Grankin, K.; Hébrard, E.; Hussain, G. A. J.; Vidotto, A. A.; Alencar, S. H. P.; Haywood, R. D.; Bouvier, J.; Petit, P.; Takami, M.; Herczeg, G. J.; Gregory, S. G.; Jardine, M. M.; Morin, J.; the MaTYSSE collaboration (2016), "The hot Jupiter of the magnetically active weak-line T Tauri star V830 Tau",Monthly Notices of the Royal Astronomical Society,465(3): 3343–3360,arXiv:1611.02055,doi:10.1093/mnras/stw2904{{citation}}:CS1 maint: unflagged free DOI (link)
  9. ^Newborn Giant Planet Grazes its Sun,IRAP / OMP Press Release, 2016 Jun 20
  10. ^"'Hot Jupiter' planet orbiting newborn star surprises scientists" CBC Newshttp:// cbc.ca/news/technology/hot-jupiter-1.3419412
  11. ^"Discovery of 'baby' planets sheds light on planet and solar system formation "The Guardian
  12. ^Damasso, M.; et al. (October 2020). "The GAPS Programme at TNG. XXVII. Reassessment of a young planetary system with HARPS-N: is the hot Jupiter V830 Tau b really there?".Astronomy & Astrophysics.642:A133.arXiv:2008.09445.Bibcode:2020A&A...642A.133D.doi:10.1051/0004-6361/202038864.
  13. ^Planet V830 Tau b on exoplanet.eu
  14. ^"V830 Tauri b".Retrieved2016-06-22.
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