HD 4313
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 45m 40.3578s |
| Declination | +07° 50′ 42.075″ |
| Apparent magnitude (V) | 7.83 |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | G5 |
| B−V color index | +0.963±0.017 |
| Astrometry | |
| Radial velocity (Rv) | +14.48±0.23 km/s |
| Proper motion (μ) | RA: −6.281 mas/yr Dec.: +6.566 mas/yr |
| Parallax (π) | 7.3090±0.0879 mas |
| Distance | 446 ± 5 ly (137 ± 2 pc) |
| Absolute magnitude (MV) | 2.17 |
| Details | |
| Mass | 1.61+0.13 −0.12 M☉ |
| Radius | 5.15+0.18 −0.17 R☉ |
| Luminosity | 15.81 L☉ |
| Surface gravity (log g) | 3.24 cgs |
| Temperature | 4,966±40 K |
| Metallicity [Fe/H] | 0.05±0.10 dex |
| Rotational velocity (v sin i) | 1.91±0.25 km/s |
| Age | 2.03+0.64 −0.45 Gyr |
| Other designations | |
| BD+07°104, HD 4313, HIP 3574, 2MASS J00454035+0750421, Gaia DR2 2557541493057378048 | |
| Database references | |
| SIMBAD | data |
HD 4313 is a star with an orbiting exoplanetary companion in the constellation of Pisces. It has an apparent visual magnitude of 7.83, which is too faint to be reading visible to the unaided eye. The system is located at a distance of 446 light years based on parallax, and is drifting further away with a radial velocity of 14.5 km/s. This is a single star, which means it has no binary partners, at least in a range of projected separations from 6.85 to 191.78 AU. It hosts an extrasolar planet.
This is an aging G-type star with a mass of nearly twice the Sun, although different methods give mass estimates which differ as much as 0.5 M☉. It is a swollen star with 5.14 times the radius of the Sun, and has a cool effective temperature of 4,966±40 k. It is a G-type subgiant star which has exhausted the hydrogen at its core, and is cooling and expanding to become a red giant. It is around two billion years in age and is spinning with a projected rotational velocity of 1.9 km/s.
Planetary system
HD 4313 has a superjovian exoplanet orbiting it. This exoplanet was discovered in 2010. It is orbiting the star at a distance of 1.16 AU with an orbital period of 356 days and an eccentricity (ovalness) of 0.15. As the orbital inclination is unknown, only a lower bound on the mass can be determined. The exoplanet has at least 1.2 times the mass of Jupiter.
| 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 2 3 4 5 6 7 8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- 1 2 3 4 5 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. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- 1 2 3 4 Luhn, Jacob K.; et al. (2019). "Retired A Stars and Their Companions. VIII. 15 New Planetary Signals around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts". The Astronomical Journal. 157 (4). 149. arXiv:1811.03043. Bibcode:2019AJ....157..149L. doi:10.3847/1538-3881/aaf5d0. S2CID 102486961.
- ↑ Cannon, A. J.; Pickering, E. C. (1993). "VizieR Online Data Catalog: Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)". Vizier Online Data Catalog. Bibcode:1993yCat.3135....0C.
- ↑ 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.
- 1 2 3 4 5 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.
- 1 2 "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-12-11.
- ↑ "HD 4313". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-11.
- ↑ 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.
- ↑ 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.
