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|Title:||Orbital and evolutionary constraints on the planet hosting binary GJ 86 from the Hubble Space Telescope|
Bond, H. E.
Schaefer, G. H.
Holberg, J. B.
Barstow, Martin A.
Burleigh, Matthew R.
|Publisher:||Oxford University Press|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2013, 430 (1), pp. 652-660|
|Abstract:||This paper presents new observations of the planet-hosting, visual binary GJ 86 (HR 637) using the Hubble Space Telescope. Ultraviolet and optical imaging with WFC3 confirms the stellar companion is a degenerate star and indicates the binary semimajor axis is larger than previous estimates, with a ≳ 28 au. Optical STIS spectroscopy of the secondary reveals a helium-rich white dwarf with C2 absorption bands and Teff = 8180 K, thus making the binary system rather similar to Procyon. Based on the 10.8 pc distance, the companion has 0.59 M⊙ and descended from a main-sequence A star of 1.9 M⊙ with an original orbital separation a ≳ 14 au. If the giant planet is coplanar with the binary, the mass of GJ 86Ab is between 4.4 and 4.7 MJup. The similarity of GJ 86 and Procyon prompted a re-analysis of the white dwarf in the latter system, with the tentative conclusion that Procyon hosts a planetesimal population. The periastron distance in Procyon is 20 per cent smaller than in α Cen AB, but the metal-enriched atmosphere of Procyon B indicates that the planet formation process minimally attained 25 km bodies, if not small planets as in α Cen.|
|Rights:||© 2013 The Authors, All rights reserved. Published by Oxford University Press on behalf of the Royal Astronomical Society. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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