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

2020 ◽  
Author(s):  
Shaojie Chen ◽  
Denis Brousseau ◽  
Olivier Lardière ◽  
Suresh Sivanandam ◽  
Simon Thibault ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Optical Design ◽  
Integral Field Spectrograph ◽  
Integral Field

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

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.

scholarly journals Design of pre-optics for laser guide star wavefront sensor for the ELT

2017 ◽  
Vol 6 (6) ◽  
Author(s):  
Eduard Muslimov ◽  
Kjetil Dohlen ◽  
Benoit Neichel ◽  
Emmanuel Hugot
Keyword(s):  
Optical Design ◽  
Laser Guide Star ◽  
Wavefront Sensors ◽  
Incoming Beam ◽  
Wavefront Error ◽  
Integral Field Spectrograph ◽  
Guide Star ◽  
Laser Guide ◽  
Light Integral ◽  
Integral Field

AbstractIn the present paper, we consider the optical design of a zoom system for the active refocusing in laser guide star wavefront sensors. The system is designed according to the specifications coming from the Extremely Large Telescope (ELT)-HARMONI instrument, the first-light, integral field spectrograph for the European (E)-ELT. The system must provide a refocusing of the laser guide as a function of telescope pointing and large decentring of the incoming beam. The system considers four moving lens groups, each of them being a doublet with one aspherical surface. The advantages and shortcomings of such a solution in terms of the component displacements and complexity of the surfaces are described in detail. It is shown that the system can provide the median value of the residual wavefront error of 13.8–94.3 nm and the maximum value <206 nm, while the exit pupil distortion is 0.26–0.36% for each of the telescope pointing directions.

scholarly journals First light with ALES: A 2-5 micron adaptive optics Integral Field Spectrograph for the LBT

2015 ◽  
Author(s):  
Andrew J. Skemer ◽  
Philip Hinz ◽  
Manny Montoya ◽  
Michael F. Skrutskie ◽  
Jarron Leisenring ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Integral Field Spectrograph ◽  
Integral Field

SWIFT: An adaptive optics assisted I/z band integral field spectrograph

2006 ◽  
Vol 49 (10-12) ◽  
pp. 647-654 ◽  
Author(s):  
Matthias Tecza ◽  
Niranjan Thatte ◽  
Fraser Clarke ◽  
Timothy Goodsall ◽  
Myrto Symeonidis
Keyword(s):  
Adaptive Optics ◽  
Integral Field Spectrograph ◽  
Integral Field

The adaptive optics beam steering mirror for the GMT Integral-Field Spectrograph, GMTIFS

2014 ◽  
Author(s):  
R. Sharp ◽  
R. Boz ◽  
J. Hart ◽  
G. Bloxham ◽  
D. Bundy ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Beam Steering ◽  
Integral Field Spectrograph ◽  
Integral Field

Optical design of FRIDA, the integral-field spectrograph and imager for the AO system of the Gran Telescopio Canarias

2008 ◽  
Author(s):  
Salvador Cuevas ◽  
Stephen S. Eikenberry ◽  
Beatriz Sánchez ◽  
Oscar Chapa ◽  
Carlos Espejo ◽  
...  
Keyword(s):  
Optical Design ◽  
Integral Field Spectrograph ◽  
Integral Field

GMTIFS: the adaptive optics beam steering mirror for the GMT integral-field spectrograph

2016 ◽  
Author(s):  
J. Davies ◽  
G. Bloxham ◽  
R. Boz ◽  
D. Bundy ◽  
B. Espeland ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Beam Steering ◽  
Integral Field Spectrograph ◽  
Integral Field

scholarly journals Potential science for the OASIS integral field spectrograph with laser guide star adaptive optics

2006 ◽  
Vol 49 (10-12) ◽  
pp. 488-494 ◽  
Author(s):  
Simon L. Morris ◽  
Joris Gerssen ◽  
Mark Swinbank ◽  
Richard Wilman
Keyword(s):  
Adaptive Optics ◽  
Laser Guide Star ◽  
Integral Field Spectrograph ◽  
Guide Star ◽  
Laser Guide ◽  
Integral Field
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