High-contrast 3.8μm imaging of the brown dwarf/planet-mass companion to GJ 758

Thayne Currie, Vanessa Bailey, Daniel Fabrycky, Ruth Murray-Clay, Timothy Rodigas, Philip M Hinz

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We present L ′-band (3.8μm) MMT/Clio high-contrast imaging data for the nearby star GJ 758, which was recently reported by Thalmann et al. to have one-possibly two-faint comoving companions (GJ 758B and "C," respectively). GJ 758B is detected in two distinct data sets. Additionally, we report a possible detection of the object identified by Thalmann et al. as "GJ 758C" in our more sensitive data set, though it is likely a residual speckle. However, if it is the same object as that reported byThalmann et al. it cannot be a companion in a bound orbit. GJ 758B has an H -L ′ color redder than nearly all known L-T8 dwarfs. Based on comparisons with the COND evolutionary models, GJ 758B has Te ∼ 560 K -90K+150K and a mass ranging from ∼10-20 MJ if it is ∼1 Gyr old to ∼ 25-40 MJ if it is 8.7Gyr old. GJ 758B is likely in a highly eccentric orbit, e∼0.73 -0.21+ 0.12 ,with a semimajor axis of∼44AU-14AU +32AU. Though GJ 758B is sometimes discussed within the context of exoplanet direct imaging, its mass is likely greater than the deuterium-burning limit and its formation may resemble that of binary stars rather than that of Jovian-mass planets.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume721
Issue number2 PART 2
DOIs
StatePublished - Oct 1 2010

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dwarf planets
planet
eccentric orbits
binary stars
speckle
deuterium
ultrahigh frequencies
extrasolar planets
planets
orbits
color
stars

Keywords

  • Brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

High-contrast 3.8μm imaging of the brown dwarf/planet-mass companion to GJ 758. / Currie, Thayne; Bailey, Vanessa; Fabrycky, Daniel; Murray-Clay, Ruth; Rodigas, Timothy; Hinz, Philip M.

In: Astrophysical Journal Letters, Vol. 721, No. 2 PART 2, 01.10.2010.

Research output: Contribution to journalArticle

Currie, Thayne ; Bailey, Vanessa ; Fabrycky, Daniel ; Murray-Clay, Ruth ; Rodigas, Timothy ; Hinz, Philip M. / High-contrast 3.8μm imaging of the brown dwarf/planet-mass companion to GJ 758. In: Astrophysical Journal Letters. 2010 ; Vol. 721, No. 2 PART 2.
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