WISE J030449.03-270508.3 belongs to a class of cold, extremely low mass objects, known as Y dwarfs. Only about twenty of those are known, and this one shows a peculiar spectrum suggesting that it may be metal-poor and/or older than previously identified Y0 dwarfs. It was discovered and studies by an international group of astronomers, including myself.
A link to the press release: http://www.ras.org.uk/news-and-press/2493-planet-like-object-may-have-spent-its-youth-as-hot-as-a-star
A link to the paper (accepted for publication in MNRAS): http://adsabs.harvard.edu/abs/2014arXiv1408.0284P
A full text pdf is publicly accessible at: http://arxiv.org/abs/1408.0284