SIMBAD references

2007ApJ...665..785J - Astrophys. J., 665, 785-793 (2007/August-2)

Retired A stars and their companions: exoplanets orbiting three intermediate-mass subgiants.

JOHNSON J.A., FISCHER D.A., MARCY G.W., WRIGHT J.T., DRISCOLL P., BUTLER R.P., HEKKER S., REFFERT S. and VOGT S.S.

Abstract (from CDS):

We report precision Doppler measurements of three intermediate-mass subgiants obtained at Lick and Keck Observatories. All three stars show variability in their radial velocities consistent with planet-mass companions in Keplerian orbits. We find a planet with a minimum mass MPsini=2.5 MJ in a 351.5 day orbit around HD 192699, a planet with a minimum mass of 2.0 MJ in a 341.1 day orbit around HD 210702, and a planet with a minimum mass of 0.61 MJ in a 297.3 day orbit around HD 175541. Mass estimates from stellar interior models indicate that all three stars were formerly A-type, main-sequence dwarfs with masses ranging from 1.65 to 1.85 M. These three long-period planets would not have been detectable during their stars' main-sequence phases due to the large rotational velocities and stellar jitter exhibited by early-type dwarfs. There are now nine ``retired'' (evolved) A-type stars (M*>1.6 M) with known planets. All nine planets orbit at distances a≥0.78 AU, which is significantly different from the semimajor axis distribution of planets around lower mass stars.

Abstract Copyright:

Journal keyword(s): Stars: Planetary Systems: Formation - stars: individual (HD 192699) - stars: individual (HD 210702) - stars: individual (HD 175541) - Techniques: Radial Velocities

Simbad objects: 25

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