BD+48 740

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. Detection of radial velocity variations indicate a companion planet of 1.6 jupiter masses 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.[4]

The BD+48 740 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b — — — — — —
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
Distanceapprox. 2,000 ly
(approx. 700 pc)
Other designations
BD+48 740, AG+48 308, GSC 03304-00090, HIC 12684, HIP 12684, 2MASS J02425822+4855483, PPM 45405, SAO 38272, TYC 3304-90-1[2]
Database references
SIMBADdata

References
  1. 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.
  2. "BD+48 740". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 June 2017.
  3. 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.
  4. 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.


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