HD 4313

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HD 4313
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 00h 45m 40.3578s[1]
Declination +07° 50′ 42.075″[1]
Apparent magnitude (V) 7.83[2]
Characteristics
Spectral type K2 IV
Astrometry
Radial velocity (Rv)14.67[2] km/s
Proper motion (μ) RA: −6.281[1] mas/yr
Dec.: 6.566[1] mas/yr
Parallax (π)7.3090 ± 0.0879[1] mas
Distance446 ± 5 ly
(137 ± 2 pc)
Details
Mass1.61+0.13
−0.12[3] M☉
Radius5.15+0.18
−0.17[4] R☉
Surface gravity (log g)3.24[2] cgs
Temperature4966±40[4] K
Metallicity [Fe/H]0.05±0.10[4] dex
Rotational velocity (v sin i)1.91±0.25[2] km/s
Age2.03+0.64
−0.45[4] Gyr
Other designations
BD+07°104, Gaia DR2 2557541493057378048, HD 4313, HIP 3574, 2MASS J00454035+0750421
Database references
SIMBADdata

HD 4313 is a K-type subgiant located in the constellation of Pisces. It hosts an extrasolar planet, and is drifting away from the Solar System with a radial velocity of 14.67 km/s.

HD 4313 is a single star, which means it has no binary partners, at least in range of projected separations from 6.85 to 191.78 AU.[5]

Physical properties[]

This is an aging star with a mass of nearly twice the Sun, although different methods give mass estimates which differ as much as 0.5 M☉.[4] It also is a swollen star with 5.14 times the radius, and has a cool temperature of 4966±40 k. The "IV" in the spectral class means it's a K-type subgiant star which is starting to exhaust the hydrogen at its core, and cooling and expanding to become a red giant.

Planetary system[]

HD 4313 has a superjovian planet orbiting it. This planet was discovered in 2010.[6]

The HD 4313 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 1.927±0.090 MJ 1.157±0.097 356.21±0.88 0.147±0.047 — 1.2 RJ

References[]

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. ^ a b c d "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-12-11.
  3. ^ Malla, Sai Prathyusha; Stello, Dennis; Huber, Daniel; Montet, Benjamin T.; Bedding, Timothy R.; Fredslund Andersen, Mads; Grundahl, Frank; Jessen-Hansen, Jens; Hey, Daniel R.; Palle, Pere L.; Deng, Licai; Zhang, Chunguang; Chen, Xiaodian; Lloyd, James; Antoci, Victoria (2020). "Asteroseismic masses of four evolved planet-hosting stars using SONG and TESS: Resolving the retired A-star mass controversy". Monthly Notices of the Royal Astronomical Society. 496 (4): 5423–5435. arXiv:2006.07649. doi:10.1093/mnras/staa1793.
  4. ^ a b c d e North, Thomas S. H.; Campante, Tiago L.; Miglio, Andxsrea; Davies, Guy R.; Grunblatt, Samuel K.; Huber, Daniel; Kuszlewicz, James S.; Lund, Mikkel N.; Cooke, Benjamin F.; Chaplin, William J. (2017). "The masses of retired a stars with asteroseismology: Kepler and K2 observations of exoplanet hosts". Monthly Notices of the Royal Astronomical Society. 472 (2): 1866–1878. arXiv:1708.00716. doi:10.1093/mnras/stx2009.
  5. ^ Wittrock, Justin M.; Kane, Stephen R.; Horch, Elliott P.; Howell, Steve B.; Ciardi, David R.; Everett, Mark E. (2017). "Exclusion of Stellar Companions to Exoplanet Host Stars". The Astronomical Journal. 154 (5): 184. arXiv:1709.05315. Bibcode:2017AJ....154..184W. doi:10.3847/1538-3881/aa8d69. S2CID 55789971.
  6. ^ Johnson, John Asher; Howard, Andrew W.; Bowler, Brendan P.; Henry, Gregory W.; Marcy, Geoffrey W.; Wright, Jason T.; Fischer, Debra A.; Isaacson, Howard (2010). "Retired a Stars and Their Companions. IV. Seven Jovian Exoplanets from Keck Observatory1". Publications of the Astronomical Society of the Pacific. 122 (892): 701–711. arXiv:1003.3445. Bibcode:2010PASP..122..701J. doi:10.1086/653809. S2CID 188131.
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