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Multicore fibers are gaining growing attention in astronomy. The two main attributes which make them attractive for astronomy are that they reduce the distance between cores and hence have a superior fill factor to other approaches and they offer the possibility to transport light in many channels with the overhead of only having to handle a single fiber. These properties are being exploited to realize...
We demonstrate the direct generation of a laser frequency comb whose spectrum spanning over 100 THz with a 12.5-GHz spacing. It is confirmed that individual lines on the comb spectrum are shifted around 40 MHz in parallel, which could be useful for spectrograph calibration.
Because of their large numbers, red dwarfs may be the most abundant planet hosts in our Galaxy. In order to detect Earth-like planets around nearby red dwarfs (in particular late-M stars), it is crucial to conduct the precise radial velocity (RV) measurements at near-infrared wavelengths where these stars emit most of light. We report the development of the Infrared Doppler (IRD) spectrometer for...
In high-contrast imaging optical systems for direct observation of planets outside our solar system, adaptive optics with an accuracy of λ/10,000 root mean square is required to reduce the speckle noise down to 1 × 10−10 level in addition to the nulling coronagraph which eliminate the diffracted light. We developed the speckle area nulling (SAN) method as a new dark-hole control algorithm which is...
We successfully generated a 12.5-GHz-spacing astro-comb ranging over 400 nm from 1350 to 1750 nm. A synthesized pulse whose repetition rate directly linked to the spacing was compressed for nonlinearity enhancement and broad astro-comb generation.
The SPICA coronagraph instrument (SCI) provides high-contrast imaging and moderate resolution (R<200) spectroscopy at the wavelength range from 3.5 to 27μm. Based on the planet evolutional model calculated by Burrows et al. (2003), SCI will search for gas giant planets down to one Jupiter mass around nearby young (1Gyr) stars and two Jupiter masses around nearby old (5Gyr) stars. SCI also allows...
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