HD 38529

Starbox begin
name = HD 38529 A / B Starbox observe
epoch = J2000.0
constell = Orion
ra = RA|05|46|34.9120
dec = DEC|+01|10|05.496
appmag_v = +5.94 / +13.35 Starbox character
class = G4IV / M3.0V
b-v = 0.773 / 0.46
u-b = ? / ?
variable = none / ? Starbox astrometry
radial_v = +28.9
prop_mo_ra = -80.05
prop_mo_dec = -141.79
parallax = 23.57
p_error = 0.92
absmag_v = +2.81 / +10.23Starbox detail
age = ~3700 million
mass = 1.39 / ?
radius = 2.82 / ?
luminosity = 5.90 / ?
temperature = 5370 / ?
metal = 0.29 ± 0.05 [Fe/H]
rotation = 34.5 / ? Starbox catalog
names = HR 1988, BD+01°1126, HIP 27253, SAO 113119 Starbox reference
Simbad = HD+38529

HD 38529 (also known as HR 1988) is a binary star approximately 138 light-years away in the constellation of Orion.

HD 38529 A

HD 38529 A is a yellow subgiant star, which has also been classified as a main sequence dwarf of spectral type G4V. It is about 40% more massive than our Sun. Two substellar companions are known in orbit around this star, including one brown dwarf. There is a debris disk located at least 86 astronomical units from the star. [cite journal|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008ApJ...677..630H&db_key=AST&nosetcookie=1|title=The Complete Census of 70 μm-bright Debris Disks within "the Formation and Evolution of Planetary Systems" Spitzer Legacy Survey of Sun-like Stars|author=Hillenbrand, Lynne A.; Carpenter, John M.; Kim, Jinyoung Serena; Meyer, Michael R.; Backman, Dana E.; Moro-Martín, Amaya; Hollenbach, David J.; Hines, Dean C.; Pascucci, Ilaria; Bouwman, Jeroen|year=2008|journal=The Astrophysical Journal|volume=677|issue=1|pages=630 – 656|doi=10.1086/529027]

Planetary system

In 2002, the planet HD 38529 Ab was discovered by Debra Fischer who used Doppler spectrometer. [cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/320224 | author=Fischer "et al." | title=Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets | journal=The Astrophysical Journal | year=2002 | volume=551 | issue=2 | pages=1107–1118 | doi=10.1086/320224] It has mass 78% that of Jupiter and orbits very close to the star, just beyond the distance limit for hot Jupiters. One year later, a massive superjovian HD 38529 Ac was found orbiting at 3.68 AU with a minimum mass 12.7 Jupiter masses. [cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/367889 | author=Fischer "et al." | title=A Planetary Companion to HD 40979 and Additional Planets Orbiting HD 12661 and HD 38529 | journal=The Astrophysical Journal | year=2003 | volume=586 | issue=2 | pages=1394–1408 | doi=10.1086/367889 ] However, astrometric measurements from the Hipparcos satellite give a best fit inclination of 160° and a true mass 37 times that of Jupiter, turning this planet into a brown dwarf. [cite journal|url=http://www.edpsciences.org/articles/aa/abs/2006/14/aa4611-05/aa4611-05.html|author=Reffert, S., Quirrenbach, A.|title=Hipparcos astrometric orbits for two brown dwarf companions: HD 38529 and HD 168443|journal=Astronomy and Astrophysics|volume=449|year=2006|pages=699 – 702|doi=10.1051/0004-6361:20054611|format=abstract] Other astrometricians from Hubble are calculating their own inclination, and expect publication by mid 2009. [cite arXiv | title=HST FGS astrometry - the value of fractional millisecond of arc precision | author=G. Fritz Benedict, Barbara E. McArthur, and Jacob L. Bean |class=astro-ph |eprint=0803.0296v1 ]

PlanetboxOrbit
exoplanet = b
mass = >0.78
period = 14.309 ± 0.05
semimajor = 0.129
eccentricity = 0.29 ± 0.02PlanetboxOrbit
exoplanet = c
mass = 37±|36|19
period = 2174.3 ± 30
semimajor = 3.68
eccentricity = 0.36 ± 0.05PlanetboxOrbit disk
disk = Debris disk
periapsis = >86

HD 38529 B

HD 38529 B is a common proper motion stellar companion to HD 38529 A at a projected distance of about 12042 AU. The star is a red dwarf of spectral type M3.0V. [cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/504823 | author=Raghavan "et al." | title=Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems | journal=The Astrophysical Journal | volume=646 | issue=1 | pages=523–542 | year=2006 | doi=10.1086/504823 ]

ee also

* List of stars with confirmed extrasolar planets
* HD 168443

References

External links

*cite web|url=http://exoplanet.eu/star.php?st=HD+38529|title=Notes for star HD 38529|work=The Extrasolar Planets Encyclopaedia|accessdate=14 April|accessyear=2006
*cite web|url=http://www.extrasolar.net/startour.asp?StarCatId=&StarId=119|title=HD 38529|work=Extrasolar Visions|author=John Whatmough|accessdate=14 April|accessyear=2006
* [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions] by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona