University of Hertfordshire

From the same journal

From the same journal

By the same authors

Documents

  • J.C. Beamin
  • D. Minniti
  • J. B. Pullen
  • Valentin D. Ivanov
  • E. Bendek
  • A. Bayo
  • M. Gromadzki
  • R. Kurtev
  • P. W. Lucas
  • R. P. Butler
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Original languageEnglish
Number of pages7
Pages (from-to)3952-3958
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date21 Dec 2017
Volume472
Issue4
Early online date19 Aug 2017
DOIs
Publication statusPublished - 21 Dec 2017

Abstract

The VVV survey has observed the southern disk of the Milky Way in the near infrared, covering 240 deg$^{2}$ in the $ZYJHK_S$ filters. We search the VVV Survey images in a $\sim$19 deg$^{2}$ field around $\alpha$ Centauri, the nearest stellar system to the Sun, to look for possible overlooked companions that the baseline in time of VVV would be able to uncover. The photometric depth of our search reaches $Y\sim$19.3 mag, $J\sim$19 mag, and $K_S\sim$17 mag. This search has yielded no new companions in $\alpha$ Centauri system, setting an upper mass limit for any unseen companion well into the brown dwarf/planetary mass regime. The apparent magnitude limits were turned into effective temperature limits, and the presence of companion objects with effective temperatures warmer than 325K can be ruled out using different state-of-the-art atmospheric models. These limits were transformed into mass limits using evolutionary models, companions with masses above 11 M$_{Jup}$ were discarded, extending the constraints recently provided in the literature up to projected distances of d

Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2017 Crown Copyright. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

ID: 12532642