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Scientific Performance Analysis of the SYZ Telescope Design versus the RC Telescope Design D. Ma & Z. Cai contributed equally to this paper
Recently, Su et al. propose an innovative design, referred as the \"SYZ\" design, for China's new project of a 12 m optical-infrared telescope. The SYZ telescope design consists of three aspheric mirrors with non-zero power, including a relay mirror below the primary mirror. SYZ design yields a good imaging quality and has a relatively flat field curvature at Nasmyth focus. To evaluate the science-compatibility of this three-mirror telescope, in this paper, we thoroughly compare the performance of SYZ design with that of Ritchey-Chrétien (RC) design, a conventional two-mirror telescope design. Further, we propose the Observing Information Throughput (OIT) as a metric for quantitatively evaluating the telescopes' science performance. We find that although a SYZ telescope yields a superb imaging quality over a large field of view, a two-mirror (RC) telescope design holds a higher overall throughput, a better diffraction-limited imaging quality in the central field of view (FOV < 5′) which is better for the performance of extreme Adaptive Optics (AO), and a generally better scientific performance with a higher OIT value.
Journal Article
Thermal emission from the Earth-sized exoplanet TRAPPIST-1 b using JWST
The TRAPPIST-1 system is remarkable for its seven planets that are similar in size, mass, density and stellar heating to the rocky planets Venus, Earth and Mars in the Solar System
1
. All the TRAPPIST-1 planets have been observed with transmission spectroscopy using the Hubble or Spitzer space telescopes, but no atmospheric features have been detected or strongly constrained
2
–
5
. TRAPPIST-1 b is the closest planet to the M-dwarf star of the system, and it receives four times as much radiation as Earth receives from the Sun. This relatively large amount of stellar heating suggests that its thermal emission may be measurable. Here we present photometric secondary eclipse observations of the Earth-sized exoplanet TRAPPIST-1 b using the F1500W filter of the mid-infrared instrument on the James Webb Space Telescope (JWST). We detect the secondary eclipses in five separate observations with 8.7
σ
confidence when all data are combined. These measurements are most consistent with re-radiation of the incident flux of the TRAPPIST-1 star from only the dayside hemisphere of the planet. The most straightforward interpretation is that there is little or no planetary atmosphere redistributing radiation from the host star and also no detectable atmospheric absorption of carbon dioxide (CO
2
) or other species.
Observations from the James Webb Space Telescope suggest that the exoplanet TRAPPIST-1 b has little or no planetary atmosphere and no detectable atmospheric absorption of carbon dioxide.
Journal Article
Telescopes
Introduces telescopes, discussing the types of telescopes, the civilizations and people who engineered them, and the advances in their construction.
Book
Position Displacement of Diffuse Interstellar Bands 1 1This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory (Chile)
We reconsider the already published phenomenon of the blue shift of diffuse interstellar bands, observed in spectra of HD34078 (AE Aur) and members of the Sco OB1 association, in particular HD152233. We have analyzed 29 diffuse bands. Some of them, already proven as blue-shifted in our earlier study, are now confirmed using another instrument: the 6.5 m Clay telescope equipped with the MIKE spectrograph. The high signal-to-noise ratio (over 600) of our spectra allowed us to reveal even small small-scale displacements of positions (both blue and redshifts) of diffuse bands along the considered lines of sight. In some cases, the magnitude of deviation exceeds 10 km s-1. Also, we prove that profiles of many diffuse bands in spectra of HD34078 suffer significant broadening. The origin of the observed phenomena is discussed.
Journal Article
Classic telescopes : a guide to collecting, restoring, and using telescopes of yesteryear
This text describes the telescopes built by such renowned makers as Dollond, Alvan Clark, Thomas Cooke & Sons, Carl Zeiss and others. It includes interviews with collectors of classic telescopes, and tips for readers on prospecting for and acquiring their own.
Book
The INAF-Arcetri Astrophysical Observatory contribution to SKA-Low: technology and first observations/Il contributo dell'INAF-Osservatorio Astrofisico di Arcetri alla tecnologia ed alle prime osservazioni di SKA-Low
SKA (Square Kilometre Array), the largest and most powerful interferometric array of radio telescopes in the world in the 50 MHz to 15 GHz frequency range is currently under construction. Its unprecedented performance will revolutionize modern astrophysics starting from the next decade. The technological radioastronomical group at the INAF-Arcetri Astrophysical Observatory is actively involved in the design, development and validation of SKA-Low, the low-frequency (50-350 MHz) component of SKA. Keywords. SKA, radio telescopes, aperture arrays, calibration. SKA (Square Kilometre Array), la più estesa e potente rete interferometrica di radiotelescopi al mondo nella banda di frequenze da 50 MHz a 15 GHz, è attualmente in fase di costruzione. A partire dal prossimo decennio, le prestazioni senza precedenti di SKA rivoluzioneranno l'astrofisica moderna. Il gruppo tecnologico di radioastronomia dell'Osservatorio Astrofisico di Arcetri (INAF) contribuisce attivamente alle fasi di design, sviluppo e validazione di SKA-Low, la componente di SKA operante a bassa frequenza (50-350 MHz). Parole chiave. SKA, radiotelescopi, array di aperture, calibrazione.
Journal Article