TW Hydrae

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Star
TW Hydrae
Inner region of TW Hydrae protoplanetary disc.jpg
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Water snake
Right ascension 11 h 01 m 51.91 s
declination -34 ° 42 ′ 17 ″
Apparent brightness 10.92 mag
Typing
rel. Brightness
(G-band) 		(10.4393 ± 0.0042) mag
Spectral class K6Ve - M1e
Variable star type T-tauri star 
Astrometry
parallax (16.6428 ± 9.0416)  mas
distance (195.6 ± 0.5)  Lj
(59.982 ± 0.151)  pc  
Visual absolute brightness M vis +7.27 mag
Proper movement 
Rec. Share: (−68.389 ± 0.054)  mas / a
Dec. portion: (−14.016 ± 0.059)  mas / a
Physical Properties
radius 1.11  R ☉
Effective temperature (4057 ± 60)  K.
Other names
and catalog entries
Cordoba Survey CD -34 ° 7151
Hipparcos catalog HIP 53911 [1]
Tycho catalog TYC 7208-347-1 [2]
2MASS catalog 2MASS J11015191-3442170 [3]
Other names Gaia DR2 5401795662560500352
annotation
  1. ↑ Calculated from apparent brightness and distance.

Template: Infobox star / maintenance / magG

TW Hydrae , or TW Hya for short , is the closest classic T-Tauri star to the Sun at a distance of about 60 parsecs (196 light years ) . TW Hydrae has about 80% the mass of the Sun, but is only 5 to 10 million years old. The special thing about TW Hydrae is that it is surrounded by a disk of dust from which it itself was created through accretion . The dust disk was detected by the Hubble Space Telescope . In the vicinity of TW Hydrae there are about 20 more stars that are probably the same age as TW Hydrae. This cluster of stars is called the TW-Hydrae Association .

A team led by Johny Setiawan from the Max Planck Institute for Astronomy in Heidelberg published a study in 2007 in which they claimed the discovery of a substellar object with a minimum mass of (9.8 ± 3.3) Jupiter masses around TW Hya and as a potential exoplanet characterized. However, an investigation by other researchers in 2008 could not confirm the alleged discovery. In 2013, based on scaling to previous hydrodynamic simulations of the gap opening criteria for embedded proto-planets, a planet companion that forms the gap could have a mass between 6 and 28 M ⊕ (orbit radius of 80 AU ).

Web links

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ a b c d Gaia Collaboration, AGA Brown, A. Vallenari, T. Prusti, JHJ de Bruijne: Gaia Data Release 2: Summary of the contents and survey properties . In: Astronomy & Astrophysics . tape 616 , August 2018, ISSN  0004-6361 , p. A1 , doi : 10.1051 / 0004-6361 / 201833051 ( aanda.org [accessed August 26, 2020]).
  3. ↑ a b E. Gaidoş, AW man, S. Lépine, A. Buccino, D. James: Trumpeting M dwarfs with CONCH SHELL: a catalog of nearby cool host stars for habitable exoplanets and life . In: Monthly Notices of the Royal Astronomical Society . tape 443 , no. 3 , September 21, 2014, ISSN  1365-2966 , p. 2561-2578 , doi : 10.1093 / mnras / stu1313 ( oup.com [accessed August 26, 2020]).
  4. ↑ a b Gaia Data Release 2 (Gaia DR2, Gaia Collaboration, 2018)
  5. ^ A b C. AL Bailer-Jones, J. Rybizki, M. Fouesneau, G. Mantelet, R. Andrae: Estimating Distance from Parallaxes. IV. Distances to 1.33 Billion Stars in Gaia Data Release 2 . In: The Astronomical Journal . tape 156 , no. 2 , July 20, 2018, ISSN  1538-3881 , p. 58 , doi : 10.3847 / 1538-3881 / aacb21 ( iop.org [accessed August 26, 2020]).
  6. ↑ Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones et al, 2018)
  7. ↑ Joseph H. Rhee, Inseok Song, B. Zuckerman, Michael McElwain: Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs . In: The Astrophysical Journal . tape 660 , no. 2 , May 10, 2007, ISSN  0004-637X , p. 1556–1571 , doi : 10.1086 / 509912 ( iop.org [accessed August 26, 2020]).
  8. ↑ J. Setiawan, Th. Henning, R. Launhardt, A. Müller, P. Weise & M. Kürster: A young massive planet in a star-disk system . In: Nature . 451, Jan. 3, 2008, pp. 38-41. doi : 10.1038 / nature06426 .