DAVINCI: a high-performance imager and integral field spectrograph for the W. M. Keck Observatory's next-generation adaptive optics facility

AbstractEarly design studies for the future Exo-Planet Imaging Camera and Specrotgraph (EPICS) on the European Extremely Large Telescope (E-ELT) show the ability to probe the region of super-Earths in the habitable zone of stars within 5pc (including Gilese 581d). However, these planets will be lost to us if the correct choice of integral field spectrograph (IFS) technology is not selected for such an instrument the ability to fit and remove the speckle noise that remains is crucial to reaching these contrasts.We conclusively demonstrate, though the use of an experimental setup producing an artificial speckle, that slicer based IFSs and post-processing using spectral deconvolution can achieve speckle rejection factors exceeding 103. Contrary to popular belief, we do not find any evidence that this choice of IFS technology limits the achievable contrast. Coupled with extreme adaptive optics and high performance coronographs, a slicer based integral field spectrograph could achieve contrasts exceeding 109, enabling these super-Earths to be detected in the habitable zone of nearby stars, making it an attractive option for the next generation of instruments being designed for the direct detection of extra solar planets.

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Determination of the residual and static aberrations of an adaptive-optics integral field spectrograph

Adaptive Optics Systems VI ◽

10.1117/12.2312191 ◽

2018 ◽

Author(s):

Alan M. Watson ◽

Salvador Cuevas Cardona ◽

Beatriz S. Sánchez

Keyword(s):

Adaptive Optics ◽

Integral Field Spectrograph ◽

Integral Field

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VIRUS2: a next generation replicated integral field spectrograph with wide field and broad wavelength coverage

Ground-based and Airborne Instrumentation for Astronomy VIII ◽

10.1117/12.2562623 ◽

2020 ◽

Author(s):

Gary J. Hill ◽

Hanshin Lee ◽

Brian L. Vattiat ◽

John M. Good ◽

Jason Ramsey ◽

...

Keyword(s):

Wide Field ◽

Next Generation ◽

Integral Field Spectrograph ◽

Integral Field

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Gemini IRMOS: preliminary optical design of a multi-object adaptive optics-fed infrared integral-field spectrograph

Ground-based and Airborne Instrumentation for Astronomy VIII ◽

10.1117/12.2561942 ◽

2020 ◽

Author(s):

Shaojie Chen ◽

Denis Brousseau ◽

Olivier Lardière ◽

Suresh Sivanandam ◽

Simon Thibault ◽

...

Keyword(s):

Adaptive Optics ◽

Optical Design ◽

Integral Field Spectrograph ◽

Integral Field

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CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion

Astronomy and Astrophysics ◽

10.1051/0004-6361/202038706 ◽

2020 ◽

Vol 640 ◽

pp. L12

Author(s):

S. Y. Haffert ◽

R. G. van Holstein ◽

C. Ginski ◽

J. Brinchmann ◽

I. A. G. Snellen ◽

...

Keyword(s):

Adaptive Optics ◽

Near Infrared ◽

Type Star ◽

Atmospheric Models ◽

Planetary Mass ◽

Medium Resolution ◽

Low Mass ◽

Integral Field Spectrograph ◽

Integral Field

Context. Direct imaging provides a steady flow of newly discovered giant planets and brown dwarf companions. These multi-object systems can provide information about the formation of low-mass companions in wide orbits and/or help us to speculate about possible migration scenarios. Accurate classification of companions is crucial for testing formation pathways. Aims. In this work we further characterise the recently discovered candidate for a planetary-mass companion CS Cha b and determine if it is still accreting. Methods. MUSE is a four-laser-adaptive-optics-assisted medium-resolution integral-field spectrograph in the optical part of the spectrum. We observed the CS Cha system to obtain the first spectrum of CS Cha b. The companion is characterised by modelling both the spectrum from 6300 Å to 9300 Å and the photometry using archival data from the visible to the near-infrared (NIR). Results. We find evidence of accretion and outflow signatures in Hα and OI emission. The atmospheric models with the highest likelihood indicate an effective temperature of 3450 ± 50 K with a log g of 3.6 ± 0.5 dex. Based on evolutionary models, we find that the majority of the object is obscured. We determine the mass of the faint companion with several methods to be between 0.07 M⊙ and 0.71 M⊙ with an accretion rate of Ṁ = 4 × 10−11±0.4 M⊙ yr−1. Conclusions. Our results show that CS Cha B is most likely a mid-M-type star that is obscured by a highly inclined disc, which has led to its previous classification using broadband NIR photometry as a planetary-mass companion. This shows that it is important and necessary to observe over a broad spectral range to constrain the nature of faint companions.

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