BD+48 740
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Perseus |
Right ascension | 02h 42m 58.21780s[1] |
Declination | +48° 55′ 48.2155″[1] |
Characteristics | |
Spectral type | K3III[2] |
Astrometry | |
Radial velocity (Rv) | -5.60 ± 0.51[3] km/s |
Proper motion (μ) | RA: -5.94[1] mas/yr Dec.: -2.02[1] mas/yr |
Parallax (π) | 1.36 ± 1.13[1] mas |
Distance | approx. 2,000 ly (approx. 700 pc) |
Details[4] | |
Mass | 1.09±0.16 M☉ |
Radius | 10.33±1.81 R☉ |
Luminosity | 43.7 L☉ |
Surface gravity (log g) | 2.48±0.04 cgs |
Temperature | 4534±8 K |
Metallicity [Fe/H] | -0.13±0.06 dex |
Rotational velocity (v sin i) | <2.9 km/s |
Other designations | |
Database references | |
SIMBAD | data |
BD+48 740 is a giant star suspected of having recently engulfed one of its planets. The star has an overabundance of lithium in its atmosphere, a metal that is destroyed by nuclear reactions in stars.
Planetary system[]
Detection of radial velocity variations have led to the discovery of the superjovian planet in 2012,[5] with discovery confirmed in 2018.[4] A companion planet of minimal mass 1.7MJ is in a highly eccentric orbit, making the orbits of other planets unstable. These indications make the discoverers conclude that another planet has recently plunged into the star, been destroyed, and contributed its lithium content to the star.[5]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
>1.7±0.7 MJ | 1.7±0.1 | 733+5 −8 |
0.76+0.05 −0.09 |
— | — |
References[]
- ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b "BD+48 740". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 June 2017.
- ^ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
- ^ a b c Adamów, M.; Niedzielski, A.; Kowalik, K.; Villaver, E.; Wolszczan, A.; MacIejewski, G.; Gromadzki, M. (2018), "Tracking Advanced Planetary Systems (TAPAS) with HARPS-N", Astronomy & Astrophysics, 613: A47, arXiv:1801.04379, doi:10.1051/0004-6361/201732161, S2CID 56091464
- ^ a b Adamów, M.; Niedzielski, A.; Villaver, E.; Nowak, G.; Wolszczan, A. (2012). "BD+48 740—Li Overabundant Giant Star with a Planet: A Case of Recent Engulfment?". The Astrophysical Journal. 754 (1): L15. arXiv:1206.4938. Bibcode:2012ApJ...754L..15A. doi:10.1088/2041-8205/754/1/L15. S2CID 53550985.
External links[]
- Adamów, M.; Niedzielski, A.; Villaver, E.; Nowak, G.; Wolszczan, A. (2012). "BD+48 740—Li OVERABUNDANT GIANT STAR WITH a PLANET: A CASE OF RECENT ENGULFMENT?". The Astrophysical Journal. 754 (1): L15. arXiv:1206.4938. Bibcode:2012ApJ...754L..15A. doi:10.1088/2041-8205/754/1/L15. S2CID 53550985.
Categories:
- Perseus (constellation)
- K-type giants
- Durchmusterung objects
- Hipparcos objects
- 2MASS objects
- Planetary systems with one confirmed planet
- Giant-star stubs
- Exoplanet stubs