FY 3512

from Wikipedia, the free encyclopedia
Star
GJ 3512
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Big Bear
Right ascension 08 h 41 m 20.13 s
declination + 59 ° 29 ′ 50.4 ″
Apparent brightness (+15.05) mag
Typing
rel. Brightness
(G-band) 		13.11 ± 0.01 mag
rel. Brightness
(J-band) 		9.61 ± 0.02 mag
Known exoplanets 1
Spectral class M5.5 V
Astrometry
parallax 105.39 ± 0.09  mas
distance 30.93 ± 0.03  ly
9.49 ± 0.01  pc
Proper movement 
Rec. Share: −260.42 ± 0.13  mas / a
Dec. portion: −1279.61 ± 0.13  mas / a
Physical Properties
Dimensions (0.12 ± 0.01)  M ☉
radius (0.14 ± 0.01)  R ☉
Luminosity

(1.57 ± 0.02) × 10 −3  L ☉

Effective temperature (3080 ± 50)  K.
Metallicity [Fe / H] (−0.07 ± 0.16)
Rotation time (87 ± 5) d
Age (3 to 8) bill.  A
Other names
and catalog entries
Gliese catalog GJ 3512 [1]
2MASS catalog 2MASS J08412013 + 5929505 [2]
Other names G 234-45

Template: Infobox Star / Maintenance / MagGTemplate: Infobox Star / Maintenance / MagJ

GJ 3512 (G 234-45) is a star of the red dwarf class .

It lies 31 light years from the sun in the constellation Great Bear and is orbited by a gas planet (GJ 3512b). This exoplanet was discovered in 2019 and is unusually large in relation to the star.

Properties of the system

As a red dwarf, GJ 3512 is significantly smaller than the sun. It has only about 12% of the mass of the sun and its radius is about 14% of the solar radius. Its luminosity is only around 1.5 per thousand that of the sun.

GJ 3512b was discovered using the radial velocity method and has at least 46% the mass of Jupiter and orbits the star in just over 200 days. This means that the mass of the star GJ 3512 is only about 250 - 270 times as large as that of its planet. So far, this fact cannot be reconciled with the common assumptions about planet formation, as it was previously assumed that when a red dwarf formed, not enough dust material was available to enable the formation of such a large planet.

Individual evidence

  1. ↑ a b c d e G 234-45. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 29, 2019 .
  2. ^ Edward W. Weis: Photometry of Stars with Large Proper Motion . In: The Astronomical Journal . 112, 11/1996, p. 2300. bibcode : 1996AJ .... 112.2300W . doi : 10.1086 / 118183 .
  3. ↑ GJ 3512 b. Extrasolar Planets Encyclopaedia , accessed September 29, 2019 .
  4. ↑ a b c d e f g h i j J. C. Morales, AJ Mustill, I. Ribas, MB Davies, A. Reiners: A giant exoplanet orbiting a very-low-mass star challenges planet formation models . In: Science . tape 365 , no. 6460 , September 27, 2019, ISSN  0036-8075 , p. 1441–1445 , doi : 10.1126 / science.aax3198 , arxiv : 1909.12174 ( sciencemag.org [accessed September 28, 2019]).
  5. ↑ Unexpected discovery: giant planet orbits dwarf star. Retrieved September 28, 2019 .
  6. ↑ Charles Q. Choi 2019-09-26T18: 39: 21Z Science, Astronomy: Surprise! Giant Planet Found Circling Tiny Red Dwarf Star. Retrieved September 28, 2019 .
  7. ↑ Discovery of dwarf star: Mysterious gas planet baffles researchers. In: Spiegel Online . September 28, 2019, accessed September 28, 2019 .