planets and satellites: detection; protoplanetary disks; stars: imaging; stars: individual: MWC 758; techniques: high angular resolution
Abstract :
[en] Reference star differential imaging (RDI) is a powerful strategy for high-contrast imaging. Using example observations taken with the vortex coronagraph mode of Keck/NIRC2 in L′ band, we demonstrate that RDI provides improved sensitivity to point sources at small angular separations compared to angular differential imaging (ADI). Applying RDI to images of the low-mass stellar companions HIP 79124 C (192 mas separation, ∆L′ = 4.01) and HIP 78233 B (141 mas separation, ∆L′ = 4.78), the latter a first imaging detection, increases the significance of their detections by up to a factor of 5 with respect to ADI. We compare methods for reference frame selection and find that pre- selection of frames improves detection significance of point sources by up to a factor of 3. In addition, we use observations of the circumstellar disks around MWC 758 and 2MASS J16042165-2130284 to show that RDI allows for accurate mapping of scattered light distributions without self-subtraction artifacts.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ruane, Garreth; Department of Astronomy, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA
Ngo, Henry; NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, British Columbia, Canada
Mawet, Dimitri; Department of Astronomy, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA ; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Absil, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > PSILab
Choquet, Élodie; Department of Astronomy, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA ; Aix Marseille Univ., CNRS, CNES, LAM, Marseille, France
Cook, Therese; Department of Astronomy, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA ; Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA
Gomez Gonzalez, Carlos; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France
Huby, Elsa; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
Matthews, Keith; Department of Astronomy, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA
Meshkat, Tiffany; IPAC, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA
Reggiani, Maddalena; Space Sciences, Technologies, and Astrophysics Research (STAR) Institute, Université de Liège, Liège, Belgium
Serabyn, Eugene; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
Wallack, Nicole; Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA
Xuan, W. Jerry; Department of Astronomy, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA ; Department of Physics and Astronomy, Pomona College, 333 N. College Way, Claremont, CA 91711, USA)
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