Thoughts on Astrophysics with nano/6u cubesats
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1 18 July 2012 Thoughts on Astrophysics with nano/6u cubesats Harvey Butcher Stars & Planets Interstellar medium Transients Other ideas
2 Recall: Space platforms can provide: Access to γ-ray, x-ray, UV, IR, FIR, ULF-radio High precision photometry High angular resolution Low background in visible, near-ir Long term (weeks/months) flux monitoring
3 Nano-sats in LEO Space platforms can provide: Access to γ-ray, x-ray, UV, IR, FIR, ULF-radio High precision photometry High angular resolution Low background in visible, near-ir Long term (weeks/months) flux monitoring
4 Stars & Exo-planets Asteroseismology - precision photometry MOST: Microvariability & Oscillations of STars 1st space sat for asteroseismology, 2003 Science goals acoustic oscillations to probe structures and ages» solar-type, metal poor subdwarfs, magnetic stars (roap) physics of Wolf-Rayet stars, mass loss reflected light from exoplanets for sizes and atmospheres (ΔL / L ~ 10-6 ) and frequency resolution (Δν~ 0.1 µhz) 54kg, 15cm telescope, nm, 820 km orbit simultaneous spectroscopy (ground) and photometry (space)
5 Transit of exo-planet
6
7 Stars BRITE - constellation of 6 nanosats BRIght-star Target Explorer Austria, Canada, Poland ( ; 2014) Science niche: stars to study w/ ground-based telescopes OB-star structure and evolution» extent of convective cores» influence of rotation, mass loss RG/AGB/RSG-stars» oscillation spectra for breaking degeneracy in HR diagram» understanding surface fluctuations
8 BRITE Generic Nanosat Bus Instrumentation 3cm optical telescopes, 25degr fov < 4th mag highest precision to 7th mag with less precision one filter per satellite: 3xblue, 2xred, 1xUV
9
10 20C Instrumentation 3cm optical telescopes, 25degr fov < 4th mag highest precision to 7th mag with less precision one filter per satellite: 3xblue, 2xred, 1xUV photometric precision < 0.1% rms; < 20ppm after a month
11 β Cephei stars
12 Interstellar medium Science: map hot/warm interfaces in ISM UV spectroscopy: C IV ~10 5 K Non-scanning FTS for high spectral resolution = Heterodyned Holographic Spectrograph spatial Fourier transforms on CCD retain Jacquinot advantage (field widened = 10 4 x ) no moving parts compact, low-mass designs (full resolution of grating) all reflection optics possible, suitable for UV
13 Interstellar medium Science: map hot/warm interfaces in ISM UV spectroscopy: C IV ~10 5 K Non-scanning FTS for high spectral resolution = Heterodyned Holographic Spectrograph High latitude halo spatial Fourier transforms on CCD retain Jacquinot advantage (field widened = 10 4 x ) no moving parts compact, low-mass designs (full resolution of grating) all reflection optics possible, suitable for UV
14
15 X-ray transients 6U nano-sat as Trigger for ground based follow-up Candidate Galactic Targets Crab nebula & pulsar Supernova remnant and X-ray pulsar Cygnus X-1 Most probable black hole candidate Cygnus X-3 Binary system Hercules X-1 Neutron star with strong magnetic field GRS Black hole candidate with superluminal radio jets Scorpius X-1 Binary with weak field non-pulsed neutron star GS Transient X-ray pulsar EXO Black hole candidate Candidate extragalactic targets NGC4151 Active galaxy 3C273 Active galaxy
16 Flux collection & imaging
17 Flux collection & imaging
18 Nano-sat X-ray mission CdZnTe room temp detector
19 Other ideas for nano-sats Solar system Imaging Sun, planets (e.g. meteors on Jupiter) NEOs interior to Earth s orbit Jupiter activity (Io volcanism)
20 Other ideas for nano-sats Solar system Imaging Sun, planets (e.g. meteors on Jupiter) NEOs interior to Earth s orbit Jupiter activity (Io volcanism)
21 Other ideas for nano-sats ULF radio telescope antenna swarm survey sky at 30kHz to 10MHz (ionosphere opaque) autonomous nanosats in Lunar orbits tripole antennas, interferometrically synchronized Jupiter Ionospheric cutoff
22 Other ideas for nano-sats ULF radio telescope antenna swarm survey sky at 30kHz to 10MHz (ionosphere opaque) autonomous nanosats in Lunar orbits tripole antennas, interferometrically synchronized Moon
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