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Introducing John Gizis

This week features John Gizis. He is a professor in the Department of Physics and Astronomy at the University of Delaware in the USA. Instead of studying extremely distant luminous objects  with our most moderrn telescopes, he studies dim, nearby stars— think M, L, T and Y dwarfs. 116 more words

Introduction

A determination of the low mass end of the main sequence and the hydrogen burning limit


Image credit: P. Marenfeld & NOAO/AURA/NSF. The ordinate is the stellar radius.

In research accepted for publication in the Astronomical Journal, the RECONS (

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Astronomy

Press release: Planet-like object may have spent its youth as hot as a star

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. 55 more words

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