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

N. Lodieu; P. D. Dobbie; N. J. G. Cross; N. C. Hambly; M. A. Read; Robert Blake; D. J. E. Floyd

doi:10.1093/mnras/stt1460

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

N. Lodieu, P. D. Dobbie, N. J. G. Cross, N. C. Hambly, M. A. Read, Robert Blake, D. J. E. Floyd

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

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.

Original language	English
Pages (from-to)	2474-2482
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	435
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stt1460
Publication status	Published - 1 Nov 2013

Keywords / Materials (for Non-textual outputs)

techniques: photometric
surveys
brown dwarfs
stars: low-mass
stars: luminosity function
mass function
infrared: stars

Access to Document

10.1093/mnras/stt1460

http://adsabs.harvard.edu/abs/2013MNRAS.435.2474L

Cite this

@article{0a0807c524ff442b92c6b30c499dc8b7,

title = "Probing the Upper Scorpius mass function in the planetary-mass regime",

abstract = "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.",

keywords = "techniques: photometric, surveys, brown dwarfs, stars: low-mass, stars: luminosity function, mass function, infrared: stars",

author = "N. Lodieu and Dobbie, {P. D.} and Cross, {N. J. G.} and Hambly, {N. C.} and Read, {M. A.} and Robert Blake and Floyd, {D. J. E.}",

year = "2013",

month = nov,

day = "1",

doi = "10.1093/mnras/stt1460",

language = "English",

volume = "435",

pages = "2474--2482",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "1365-2966",

publisher = "Oxford University Press",

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TY - JOUR

T1 - Probing the Upper Scorpius mass function in the planetary-mass regime

AU - Lodieu, N.

AU - Dobbie, P. D.

AU - Cross, N. J. G.

AU - Hambly, N. C.

AU - Read, M. A.

AU - Blake, Robert

AU - Floyd, D. J. E.

PY - 2013/11/1

Y1 - 2013/11/1

N2 - 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.

AB - 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.

KW - techniques: photometric

KW - surveys

KW - brown dwarfs

KW - stars: low-mass

KW - stars: luminosity function

KW - mass function

KW - infrared: stars

U2 - 10.1093/mnras/stt1460

DO - 10.1093/mnras/stt1460

M3 - Article

SN - 1365-2966

VL - 435

SP - 2474

EP - 2482

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

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

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

Access to Document

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Cite this