Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-16
Mon.Not.Roy.Astron.Soc.341:948,2003
Astronomy and Astrophysics
Astrophysics
12 pages including 3 figures and 2 tables
Scientific paper
10.1046/j.1365-8711.2003.06481.x
We report the detection of a new candidate exoplanet around the metal-rich star tau^1 Gruis. With M sin $i$ = 1.23+/-0.18 M_JUP, a period of 1326+/-300 d and an orbit with an eccentricity of 0.14+/-0.14 it adds to the growing population of long period exoplanets with near-circular orbits. This population now comprises more than 20% of known exoplanets. When the companion to tau^1 Gruis is plotted together with all exoplanets found by the Anglo-Australian Planet Search and other radial velocity searches we find evidence for a peak in the number of short-period exoplanets, followed by a minimum of planets between around 7 and 50 days and then an apparent rise in the number of planets per unit radius that seems to set in by a hundred days, indicating more planets farther from the host star. This is very different from the gaussian-like period distribution found for stellar companions. This lends support to the idea that once a clearing in the inner protoplanetary disk develops, it halts the inward migration of planets. In particular, the smooth distribution of exoplanets arising from planetary migration through a disk is altered by an accumulation of exoplanets at the point where the disk has been cleared out.
Butler Paul R.
Carter Brad D.
Jones Hugh R. A.
Marcy Geoff W.
McCarthy Chris
No associations
LandOfFree
An exoplanet in orbit around tau^1 Gruis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An exoplanet in orbit around tau^1 Gruis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An exoplanet in orbit around tau^1 Gruis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-291561