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Title:
The Solar Neighborhood. IX. Hubble Space Telescope Detections of Companions to Five M and L Dwarfs within 10 Parsecs of the Sun
Authors:
Golimowski, David A.; Henry, Todd J.; Krist, John E.; Dieterich, Sergio; Ford, Holland C.; Illingworth, Garth D.; Ardila, David R.; Clampin, Mark; Franz, Otto G.; Wasserman, Lawrence H.; Benedict, G. Fritz; McArthur, Barbara E.; Nelan, Edmund G.
Affiliation:
AA(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686.), AB(Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303-3083.), AC(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AD(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686.), AE(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686.), AF(Lick Observatory, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.), AG(Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218-2686.), AH(NASA/Goddard Space Flight Center, Code 681, Greenbelt, MD 20771.), AI(Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001.), AJ(Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001.), AK(McDonald Observatory, University of Texas, Austin, TX 78712-1083.), AL(McDonald Observatory, University of Texas, Austin, TX 78712-1083.), AM(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.)
Publication:
The Astronomical Journal, Volume 128, Issue 4, pp. 1733-1747. (AJ Homepage)
Publication Date:
10/2004
Origin:
UCP
Astronomy Keywords:
Stars: Binaries: Close, stars: individual (G239-25AB), stars: individual (GJ 1001ABC), stars: individual (GJ 54AB), stars: individual (GJ 84AB), stars: individual (LHS 224AB), Stars: Low-Mass, Brown Dwarfs
DOI:
10.1086/423911
Bibliographic Code:
2004AJ....128.1733G

Abstract

We report the detections of low-mass companions to five M and L dwarfs within 10 pc of the Sun using the Hubble Space Telescope (HST) Near-Infrared Camera and Multi-Object Spectrometer (NICMOS). Follow-up observations using the HST Advanced Camera for Surveys (ACS) and Fine Guidance Sensor 1r (FGS1r) confirm our NICMOS discoveries of companions to the L4.5 dwarf GJ 1001B (LHS 102B) and the M5 dwarf LHS 224, respectively. Images obtained with the Astrophysical Research Consortium 3.5 m telescope at Apache Point Observatory verify our discovery of a companion to the M3 dwarf G239-25. Our NICMOS images confirm the previously suspected duplicity of the M3 dwarfs GJ 54 and GJ 84. The components of GJ 1001BC and LHS 224AB have nearly equal luminosities in all the ACS and/or NICMOS bandpasses in which they were observed. The magnitudes of GJ 54A and B in one FGS1r bandpass and four NICMOS bandpasses differ by <~1. GJ 84B and G239-25B are ~4 mag fainter than their M3 companions in the NICMOS bandpasses. We estimate from our NICMOS photometry that GJ 84B and G239-25B have spectral types M7 and M8, respectively, and masses near the lower limit for sustained hydrogen burning. The apparent separations of GJ 1001BC, GJ 54AB, and LHS 224AB suggest orbital periods less than 5 yr. These binary dwarfs are ideal candidates for continued astrometric monitoring that will quickly yield accurate dynamic masses needed to constrain the mass-luminosity relation for low-mass stars and brown dwarfs.

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