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Probing the upper Scorpius mass function in the planetary-mass regime


Lodieu, N and Dobbie, PD and Cross, NJG and Hambly, NC and Read, MA and Blake, RP and Floyd, DJE, Probing the upper Scorpius mass function in the planetary-mass regime, Monthly Notices of the Royal Astronomical Society, 435, (3) pp. 2474-2482. ISSN 0035-8711 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The Authors

DOI: doi:10.1093/mnras/stt1460


We present the results of a deep ZYJ near-infrared survey of 13.5 deg2 in the Upper Scorpius (USco) OB association. We photometrically selected ∼100 cluster member candidates with masses in the range of 30–5 Jupiters, according to state-of-the-art evolutionary models. We identified 67 ZYJ candidates as bona fide members, based on complementary photometry and astrometry. We also extracted five candidates detected with Visible and Infrared Survey Telescope for Astronomy at YJ only. One is excluded using deep optical z-band imaging, while two are likely non-members, and three remain as potential members. We conclude that the USco mass function is more likely decreasing in the planetary-mass regime (although a flat mass function cannot yet be discarded), consistent with surveys in other regions.

Item Details

Item Type:Refereed Article
Keywords:techniques: photometric – surveys – brown dwarfs – stars: low-mass – stars: luminosity function, mass function – infrared: stars
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:87065
Year Published:2013
Web of Science® Times Cited:17
Deposited By:Mathematics and Physics
Deposited On:2013-11-06
Last Modified:2015-02-10

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