SIMBAD references

2014ApJ...784...41H - Astrophys. J., 784, 41 (2014/March-3)

A mid-infrared search for substellar companions of nearby planet-host stars.


Abstract (from CDS):

Determining the presence of widely separated substellar-mass companion is crucial to understand the dynamics of inner planets in extrasolar planetary systems (e.g., to explain their high mean eccentricity as inner planets are perturbed by the Kozai mechanism). We report the results of our Spitzer/Infrared Array Camera (IRAC) imaging search for widely separated (10''-25'') substellar-mass companions for 14 planet-host stars within 15 pc of the Sun. Using deep 3.6 and 4.5 µm observations in subarray mode, we found one object in the field of 47 UMa with [3.6]-[4.5] color similar to a T5 dwarf, which is, however, unlikely to share common proper motion with 47 UMa. We also found three objects with brown-dwarf-like [3.6]-[4.5] color limits in the fields of GJ 86, HD 160691, and GJ 581, as well as another in the field of HD 69830 for which we have excluded common proper motion. We provide model-based upper mass limits for unseen objects around all stars in our sample, with typical sensitivity to 10 MJobjects from a projected separation of 50-300 AU from the parent star. We also discuss our data analysis methods for point-spread-function subtraction, image co-alignment, and artifact subtraction of IRAC subarray images.

Abstract Copyright:

Journal keyword(s): brown dwarfs - infrared: stars - methods: data analysis - planetary systems - stars: low-mass

Simbad objects: 24

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2014ApJ...784...41H and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact