Luhman 16

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Brown dwarf
Luhman 16
Luhman 16 appears as a yellow disc in the center of the picture (WISE image from January 7, 2010)
Luhman 16 appears as a yellow disc in the center of the picture (WISE image from January 7, 2010)
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Sails of the ship
Right ascension 10 h 49 m 18.92 s
declination −53 ° 19 ′ 10.1 ″
Apparent brightness (16.2 ± 0.1) mag
parallax (500.51 ± 0.11) mas
distance (6.516 ± 0.001)  Lj
(1.9980 ± 0.0004  pc )
Proper movement
Rec. Share: (−2759 ± 6) mas / a
Dec. portion: (354 ± 6) mas / a
Typing
Spectral class L7.5 + T0.5
rel. Brightness
(J-band) 		(10.73 ± 0.03) mag
Physical Properties
Dimensions (34 + 28) M ♃
Effective temperature (1350 + 1210) K.
Other names
and catalog entries
2MASS catalog 2MASS J10491891-5319100
Further designations:

WISE J104915.57-531906.1, WISE J1049-5319AB

Luhman 16 (full name WISE J104915.57-531906.1 , also WISE 1049-5319 ) is a sun close double system of brown dwarfs in the constellation Vela . The system was discovered in 2013 by Kevin Luhman using data from the Wide-Field Infrared Survey Explorer ( WISE ). The orbit parameters of the two brown dwarfs are not yet exactly known, according to more recent estimates they orbit each other at a distance of 3 AU once within 45 years.

discovery

In early March 2013, the discovery of the system was published by the American astronomer Kevin Luhman of Pennsylvania State University . The evaluated images from the WISE satellite were from January 2010 to January 2011.

details

Composite image from the WISE image (large image) and an image from the Gemini Observatory , on which the brown dwarfs can be seen individually.

The system is about 6.5 light years (around 2 parsecs ) from the sun . This makes it the third closest star system to our solar system after Alpha Centauri and Barnard's Arrow Star (whether the term “star system” in Luhman 16 is correct is however questionable; see article star ). The fact that the objects were discovered so late despite their comparatively close proximity to our earth is due to their extremely low apparent brightness , which is very typical for brown dwarfs. Alpha Centauri, the star system closest to us, is also in close proximity to the brown dwarfs. At 4.36 light years, Alpha Centauri is closer to Luhman 16 than it is to our solar system .

Initially, the masses could not be derived. The mass ratio is . The masses were on 34 and 28 later M J are determined.

A heterogeneous cloud structure could be mapped onto Luhman 16B by projecting the spectral lines of iron split up due to the rotation of the brown dwarf ( Doppler effect ). This phenomenon could not be proven for Luhman 16A.

Web links

Commons : Luhman 16  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e Luhman 16. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on March 26, 2019 .
  2. ^ A b c Johannes Sahlmann, Petro F. Lazorenko. Mass ratio of the 2 pc binary brown dwarf LUH16 and limits on planetary companions from astrometry . MNRAS letters. Vol 453, 1, L103-L107. arxiv : 1506.07994 .
  3. ↑ a b E. Victor Garcia, S. Mark Ammons, Maissa Salama, Ian Crossfield, Eduardo Bendek, Jeffrey Chilcote, Vincent Garrel, James R. Graham, Paul Kalas, Quinn Konopacky, Jessica R. Lu, Bruce Macintosh, Eduardo Marin, Christian Marois, Eric Nielsen, Benoit Neichel, Don Pham, Robert J. De Rosa, Dominic M. Ryan, Maxwell service, Gaetano Sivo: individual, model-independent measure of the Closest Known Brown Dwarf Binary to the Sun . In: The Astrophysical Journal . 846, No. 2, 2017, p. 97. arxiv : 1708.02714 . bibcode : 2017ApJ ... 846 ... 97G . doi : 10.3847 / 1538-4357 / aa844f .
  4. ^ Henri MJ Boffin, D. Pourbaix, K. Mužić, VD Ivanov, R. Kurtev, Y. Beletsky, A. Mehner, JP Berger, JH Girard, D. Mawet: Possible astrometric discovery of a substellar companion to the closest binary brown dwarf system WISE J104915.57-531906.1 . In: Astronomy and Astrophysics . 561, January 2014, p. L4. arxiv : 1312.1303 . bibcode : 2014A & A ... 561L ... 4B . doi : 10.1051 / 0004-6361 / 201322975 .
  5. ↑ a b WISE Nabs the Closest Brown Dwarfs Yet Discovered - Article in Universe Today , March 13, 2013 (Retrieved March 18, 2013)
  6. ^ The weather map from the Brown Dwarf FAZ from March 5, 2014
  7. ↑ http://iopscience.iop.org/2041-8205/778/1/L10/article
  8. ↑ http://www.nature.com/nature/journal/v505/n7485/full/nature12955.html