Reference : A Dim Candidate Companion to epsilon Cephei
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/109535
A Dim Candidate Companion to epsilon Cephei
English
Mawet, D. [European Southern Observatory, Alonso de Cordóva 3107, Vitacura, Santiago, Chile ; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA]
Mennesson, B. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA]
Serabyn, E. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA]
Stapelfeldt, K. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA]
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)]
1-Sep-2011
Astrophysical Journal Letters
IOP Publishing
738
L12
Yes (verified by ORBi)
International
2041-8205
2041-8213
Bristol
United Kingdom
[en] brown dwarfs ; instrumentation: adaptive optics ; instrumentation: high angular resolution ; stars: low-mass ; techniques: high angular resolution
[en] Using a vector vortex coronagraph behind the 1.5 m well-corrected subaperture (WCS) at Palomar, we detected a second object very close to epsilon Cephei, a δ Scuti F0 IV star. The candidate companion, ~50 times fainter than epsilon Cephei, if physically associated, is a late-type K or early M star, and lies at an angular separation of 330 mas, or 1.1 λ/D for the WCS, making it the smallest angle detection ever realized with a coronagraph in terms of λ/D units. The projected separation of the putative companion is ~8.6 AU, most likely on a highly eccentric orbit. The recently detected near-infrared excess is thus likely not due to hot dust. Moreover, we also show that the previously reported IRAS 60 μm excess was due to source confusion on the galactic plane.
Researchers
http://hdl.handle.net/2268/109535
10.1088/2041-8205/738/1/L12
http://adsabs.harvard.edu/abs/2011ApJ...738L..12M
http://iopscience.iop.org/2041-8205/738/1/L12/ - Copyright The American Astronomical Society (AAS) and IOP Publishing Limited 2009
http://de.arxiv.org/abs/1107.3872

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