SIMBAD references

2013MNRAS.430..652F - Mon. Not. R. Astron. Soc., 430, 652-660 (2013/March-3)

Orbital and evolutionary constraints on the planet hosting binary GJ 86 from the Hubble Space Telescope.

FARIHI J., BOND H.E., DUFOUR P., HAGHIGHIPOUR N., SCHAEFER G.H., HOLBERG J.B., BARSTOW M.A. and BURLEIGH M.R.

Abstract (from CDS):

This paper presents new observations of the planet-hosting, visual binary GJ86 (HR637) 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 ≳ 28au. Optical STIS spectroscopy of the secondary reveals a helium-rich white dwarf with C2 absorption bands and Teff = 8180K, thus making the binary system rather similar to Procyon. Based on the 10.8pc distance, the companion has 0.59M☉ and descended from a main-sequence A star of 1.9M☉ with an original orbital separation a ≳ 14au. If the giant planet is coplanar with the binary, the mass of GJ86Ab is between 4.4 and 4.7MJup.

The similarity of GJ86 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 αCenAB, but the metal-enriched atmosphere of ProcyonB indicates that the planet formation process minimally attained 25km bodies, if not small planets as in αCen.


Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): binaries: visual - stars: individual: GJ86A - stars: individual: GJ86B - planetary systems - white dwarfs

Simbad objects: 10

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2021.06.16-11:10:27

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