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Title:
Inflated Planets and Their Low-Mass Companions
Authors:
Mardling, R. A.
Publication:
Extreme Solar Systems, ASP Conference Series, Vol. 398, proceedings of the conference held 25-29 June, 2007, at Santorini Island, Greece. Edited by D. Fischer, F. A. Rasio, S. E. Thorsett, and A. Wolszczan, p.529
Publication Date:
00/2008
Origin:
ASP
Bibliographic Code:
2008ASPC..398..529M

Abstract

Various mechanisms have been proposed to explain the inflated size of HD 209458b after it became clear that it has no companions capable of producing a stellar reflex velocity greater than around 5 m s-1. Had there been such a companion, the hypothesis that it forces the eccentricity of the inflated planet thereby tidally heating it may have been readily accepted. Here we summarize a paper by the author which shows that companion planets with masses as low as a fraction of an Earth mass are capable of sustaining a non-zero eccentricity in the observed planet for at least the age of the system. While such companions produce stellar reflex velocities which are fractions of a meter per second and hence are below the stellar jitter limit, they are consistent with recent theoretical work which suggests that the planet migration process often produces low-mass companions to short-period giants.
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