Reference star differential imaging of close-in companions and circumstellar disks with the NIRC2 vortex coronagraph at W.M. Keck Observatory - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Astronomical Journal Année : 2019

Reference star differential imaging of close-in companions and circumstellar disks with the NIRC2 vortex coronagraph at W.M. Keck Observatory

Henry Ngo
Keith Matthews
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Résumé

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 frames 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.
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Dates et versions

hal-02115102 , version 1 (30-04-2019)

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Garreth Ruane, Henry Ngo, Dimitri Mawet, Olivier Absil, Elodie Choquet, et al.. Reference star differential imaging of close-in companions and circumstellar disks with the NIRC2 vortex coronagraph at W.M. Keck Observatory. The Astronomical Journal, 2019, 157 (3), pp.118. ⟨10.3847/1538-3881/aafee2⟩. ⟨hal-02115102⟩
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