On the age of Gliese 504
Abstract
Direct imaging observations of the solar-type star Gl 504 have recently uncovered a faint companion that, on the supposition that the host star has an age of 160-60+350 Myr, was announced to be a 4-1.0+4.5 M J Jovian exoplanet. Here we present the observational evidence that Gl 504 A is an evolved turn-off star of about solar age and by inference its faint companion a low-mass brown dwarf. As with our previous work on Gl 504 A several years ago, we suggest the accretion of a substellar object to account for the otherwise unexplained high rotation of Gl 504 A. We also propose that with the distant Gl 504 B we may now well be facing the driving agent for the former merger.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2015
- DOI:
- 10.1088/0004-637X/806/2/163
- Bibcode:
- 2015ApJ...806..163F
- Keywords:
-
- blue stragglers;
- stars: fundamental parameters;
- stars: individual: Gliese 504;
- stars: solar-type