HD 106906

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Star
HD 106906
The star HD 106906 and the planet HD 106906 b; The white circle indicates an orbit with a Neptune radius for size comparison.
The star HD 106906 and the planet HD 106906 b; The white circle indicates an orbit with a Neptune radius for size comparison.
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation southern Cross
Right ascension 12 h 17 m 53.19 s
declination -55 ° 58 ′ 31.9 ″
Apparent brightness 7.90 likes
Typing
Known exoplanets 1
B − V color index +0.46 
Spectral class F5 V
Astrometry
Radial velocity +10.20 ± 1.70 km / s
parallax 9.67 ± 0.04  mas
distance 337 ± 1  ly
103 ± 1  pc  
Proper movement 
Rec. Share: −39.01 ± 0.06  mas / a
Dec. portion: −12.87 ± 0.05  mas / a
Physical Properties
Dimensions 1.5 ± 0.1  M ☉
Luminosity

5.6 ± 0.9  L ☉

Effective temperature 6516 ± 165  K
Age 13 ± 2 million  a
Other names
and catalog entries
Cordoba Survey CD −55 ° 4537
Henry Draper Catalog HD 106906 [1]
Hipparcos catalog HIP 59960 [2]
SAO catalog SAO 239819 [3]
Tycho catalog TYC 8637-2434-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J12175319-5558319 [5]

HD 106906 (HIP 59960) is a 300 light-years distant from earth and only about 13 million years old star of the spectral type F5V with about 1.5 times the solar mass , which has not yet reached the main sequence . The star belongs to the Lower Centaurus Crux (LCC) group, part of the Scorpius Centaurus Association and was observed at the Magellan Telescope at the Las Campanas Observatory in Chile from 2005 , after early observations by the Spitzer An infrared excess was found in the space telescope .

Protoplanetary disk and exoplanet

HD 106906 has a protoplanetary disk , and an approximately 11 Jupiter masses heavy Exoplaneten HD 106906 b . The bright and massive protoplanetary disk is located between 15  AU and 120 AU away. Its infrared emission is consistent with a homogeneous temperature of about 95 K. The planet is at a distance of 650 AU (or about 97 billion kilometers). Based on the planet's infrared spectrum and planetary formation models, the companion's surface temperature is estimated to be 1800 K. It shines with 0.02% of the luminosity of the sun as a spectral type L2.5 ± 1.

The planet is so far away from its parent star that, according to current models of planet formation, there could not have been enough material for its formation at this location. For a binary star system, the mass ratio of the planet to its parent star (<1%) is "unusually" small and therefore it is unclear how HD 106906 b was able to form in only 13 million years. The planet is part of an ever growing collection of exoplanets that are far from their parent star and whose formation is not well understood.

planet Mass
( M J ) 		Radius
( R J ) 		Orbital
time
( d ) 		Angular distance
( mas ) 		eccentricity
HD 106906 b 11 ± 2 ? 1500 years 7110 ± 20 (approx. 650 AU ) ?

Gallifrey

The exoplanet was the target of a petition to the International Astronomical Union (IAU) to rename it Gallifrey. Gallifrey is the homeworld of the Doctor in the British sci-fi series Doctor Who . The petition was submitted with over 139,000 signatures. In January 2014, the IAU decided not to rename the planet Gallifrey.

See also

  • Beta Pictoris , a star with a large protoplanetary disk
  • GU Piscium b, an exoplanet orbiting the star GU Piscium in the constellation Pisces at a distance of 2000AU .

Web links

Commons : HD 106906  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d HD 106906. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed December 2, 2018 .
  2. ^ A b Hipparchus: HD 106906
  3. ↑ Exoplanets: HD 106906b
  4. ↑ a b c d e f g h V. Bailey et al .: HD 106906 b: A Planetary-mass Companion Outside a Massive Debris Disk , bibcode : 2014ApJ ... 780L ... 4B , arxiv : 1312.1265 .
  5. ↑ Vanessa Bailey: UA Astronomers Discover Planet That Shouldn't Be There . In: University of Arizona , December 5, 2013. Retrieved January 1, 2015. 
  6. ^ Gallifrey petition . In: The Mighty Challenge . Retrieved January 1, 2015.
  7. ^ Karl Quinn: Doctor Who fan in online petition to name newly found planet . In: The Sydney Morning Herald , December 11, 2013. Retrieved January 1, 2015. 
  8. ↑ Ellie Zolfagharifard: Dr Who fans set up petition to name newly-discovered planet 'Gallifrey' after home of the Time Lords - and it's already got 118,000 signatures . In: Daily Mail , December 10, 2013. Retrieved January 1, 2015.