The instruments at Telescopio Nazionale Galileo as resources for a broad community

2021 ◽  
Author(s):  
Ennio Poretti
Keyword(s):  
Near Infrared ◽  
International Community ◽  
La Palma ◽  
Broad Community

<p>Four instruments mounted at the Telescopio Nazionale Galileo (Roque de Los Muchachos Observatory, La Palma) are currently used to study exoplanets.  They are HARPS-N and GIANO-B, also combined in the new GIARPS configuration, Dolores and Nics. They exploit both the visible and near-infrared domains. I present the scientific highlights obtained in the last years by different teams, since  the access to the TNG is open to the international community through distinct calls. </p>

scholarly journals The Near-Infrared Capabilities of LEST

1994 ◽  
Vol 154 ◽  
pp. 579-588
Author(s):  
Oddbjørn Engvold
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Tracking System ◽  
Entrance Window ◽  
La Palma ◽  
System A ◽  
Near Ir ◽  
Telescope Facility ◽  
Main Mirror ◽  
Ir Instrumentation

The Large Earth-based Solar Telescope (LEST) will be a powerful, next-generation telescope with unprecedented angular resolution, capable of highly accurate polarimetry of the Sun, covering the optical spectral range from about 300 nm into the near infrared to about 2.5 μm.The telescope is a 2.4-m aperture, “polarization-free” concept based on a modified Gregorian optical system. A fast polarization modulator will be located close to the secondary focus of the system. An actively controlled NTT-type main mirror, a high precision pointing and tracking system, a helium-filled light path and a thin entrance window, together with an integrated adaptive optics system, will give the telescope near diffraction-limited performance in the visible. LEST will be sited on La Palma, in the Canary Islands, near the caldera rim on the Roque de los Muchachos Observatory, which often offers excellent seeing. A frequently occurring seeing parameter of ro = 15–20 cm in the visible will correspond to ro ≥ 1 m in the near IR.The construction of LEST will begin in 1993, and the telescope is to be ready for “first light” in 1997. The telescope facility will accommodate a large number of focal plane instruments on a spacious instrument table. LEST will be made available for near-IR instrumentation from the start of its regular operation.

Compositional characterization of V-type candidate asteroids identified using the MOVIS catalogue

2019 ◽  
Vol 488 (3) ◽  
pp. 3866-3875 ◽  
Author(s):  
H Medeiros ◽  
J de León ◽  
D Lazzaro ◽  
M Popescu ◽  
V Lorenzi ◽  
...  
Keyword(s):  
Infrared Spectra ◽  
Near Infrared ◽  
Spectral Parameters ◽  
Optical Telescope ◽  
Isaac Newton ◽  
Infrared Telescope ◽  
Band Area ◽  
La Palma ◽  
Near Infrared Spectra ◽  
The Right

ABSTRACT The main objective of this work is to compositionally analyse the visible to near-infrared spectra of a total of six V-type candidates identified using the MOVIS (Y-J) versus (J-Ks) colour–colour plot and located outside the Vesta collisional family. We obtained visible and near-infrared spectra of these asteroids using the 2.54m Isaac Newton Telescope, the 2.5m Nordic Optical Telescope, and the 3.58m Telescopio Nazionale Galileo, all located at the El Roque de Los Muchachos Observatory (La Palma, Spain), as well as the 3.0m NASA Infrared Telescope Facility, located at the Mauna Kea Observatory in Hawaii. We computed several diagnostic spectral parameters (slopes, band centres, band depths, band area ratio, or BAR) and compared them to the ones known for HED meteorites and (4) Vesta. The taxonomic classification confirmed five out of the six candidates as V-types, leading to an identification success rate about 83 per cent. In general, the spectral parameters obtained for the five V-types are in good agreement with those of HED meteorites and (4) Vesta. The exception is asteroid (2452) Lyot, a V-type in the outer belt, located very close to (1459) Magnya, but showing distinct [Wo] and [Fs] molar contents both from Magnya and Vesta, pointing toward a diogenitic compostion. We also studied the dependency of the BAR parameter on the way it is computed (removing or not the continuum), the spectral slope, and the last point used to delimit the right wing of the absorption band at 2 μm.

scholarly journals The visible and near-infrared spectra of asteroids in cometary orbits

2018 ◽  
Vol 618 ◽  
pp. A170 ◽  
Author(s):  
J. Licandro ◽  
M. Popescu ◽  
J. de León ◽  
D. Morate ◽  
O. Vaduvescu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Spectral Slope ◽  
Isaac Newton ◽  
Infrared Telescope ◽  
La Palma ◽  
Spectral Class ◽  
Telescope Facility ◽  
Hydrated Minerals ◽  
Taxonomical Classification ◽  
William Herschel

Context. Dynamical and albedo properties suggest that asteroids in cometary orbits (ACOs) are dormant or extinct comets. Their study provides new insights for understanding the end-states of comets and the size of the comet population. Aims. We intend to study the visible and near-infrared (NIR) spectral properties of different ACO populations and compare them to the independently determined properties of comets. Methods. We select our ACOs sample based on published dynamical criteria and present our own observational results obtained using the 10.4 m Gran Telescopio Canarias (GTC), the 4.2 m William Herschel Telescope (WHT), the 3.56 m Telescopio Nazionale Galileo (TNG), and the 2.5 m Isaac Newton Telescope (INT), all located at the El Roque de los Muchachos Observatory (La Palma, Spain), and the 3.0 m NASA Infrared Telescope Facility (IRTF), located at the Mauna Kea Observatory, in Hawaii. We include in the analysis the spectra of ACOs obtained from the literature. We derive the spectral class and the visible and NIR spectral slopes. We also study the presence of hydrated minerals by studying the 0.7 μm band and the UV-drop below 0.5 μm associated with phyllosilicates. Results. We present new observations of 17 ACOs, 11 of them observed in the visible, 2 in the NIR and 4 in the visible and NIR. We also discuss the spectra of 12 ACOs obtained from the literature. All but two ACOs have a primitive-like class spectrum (X or D-type). Almost 100% of the ACOs in long-period cometary orbits (Damocloids) are D-types. Those in Jupiter family comet orbits (JFC-ACOs) are ∼60% D-types and ∼40% X-types. The mean spectral slope S′ of JFC-ACOs is 9.7 ± 4.6%/1000 Å and for the Damocloids this is 12.2 ± 2.0%/1000 Å. No evidence of hydration on the surface of ACOs is found from their visible spectra. The spectral slope and spectral class distribution of ACOs is similar to that of comets. Conclusions. The spectral taxonomical classification and the spectral slope distribution of ACOs, and the lack of spectral features indicative of the presence of hydrated minerals on their surface, strongly suggest that ACOs are likely dormant or extinct comets.

Near-infrared attenuation of Saharan dust at the Tenerife and La Palma observatories

1992 ◽  
Vol 31 (4) ◽  
pp. 457
Author(s):  
P. Menéndez-Valdés ◽  
F. Blanco
Keyword(s):  
Near Infrared ◽  
Saharan Dust ◽  
La Palma

scholarly journals Calcium Features in the “Featureless” Continuum of Seyfert Nuclei: Evidence for a Young Stellar Population?

1989 ◽  
Vol 134 ◽  
pp. 560-561
Author(s):  
Angeles I. Díaz ◽  
Elena Terlevich ◽  
Roberto Terlevich
Keyword(s):  
Stellar Population ◽  
Near Infrared ◽  
Seyfert Galaxies ◽  
Infrared Region ◽  
Normal Galaxies ◽  
La Palma ◽  
Ccd Detector ◽  
Line Widths ◽  
Near Infrared Region

We have obtained intermediate resolution spectra for about 30 galaxies, normal and active, in the near infrared region covering the CaII triplet (λλ 7800–9300 Å). The data were obtained with the INT at the Roque de los Muchachos Observatory in La Palma, Spain using the Intermediate Dispersion Spectrograph and a GEC CCD detector. Details of these observations are given elsewhere (Terlevich et al. 1988). Our data show that active (Seyfert galaxies and LINERS) and normal galaxies have comparable nuclear CaII strengths and line widths.

scholarly journals Visible and near-infrared observations of interstellar comet 2I/Borisov with the 10.4-m GTC and the 3.6-m TNG telescopes

2020 ◽  
Vol 495 (2) ◽  
pp. 2053-2062 ◽  
Author(s):  
J de León ◽  
J Licandro ◽  
C de la Fuente Marcos ◽  
R de la Fuente Marcos ◽  
L M Lara ◽  
...  
Keyword(s):  
Production Rate ◽  
Heliocentric Distance ◽  
Near Infrared ◽  
Visible Spectrum ◽  
Orbital Evolution ◽  
Gas Production ◽  
Infrared Observations ◽  
La Palma ◽  
Dust Size Distribution ◽  
Visible Spectra

ABSTRACT In this work, we present the results of an observational study of 2I/Borisov carried out with the 10.4-m Gran Telescopio Canarias (GTC) and the 3.6-m Telescopio Nazionale Galileo (TNG), both telescopes located at the Roque de Los Muchachos Observatory, in the island of La Palma (Spain). The study includes images in the visible and near-infrared, as well as visible spectra in the 3600–9200 Å wavelength range. N-body simulations were also performed to explore its orbital evolution and Galactic kinematic context. The comet’s dust continuum and near-infrared colours are compatible with those observed for Solar system comets. From its visible spectrum on the nights of 2019 September 24 and 26, we measured CN gas production rates Q(CN) = (2.3 ± 0.4) × 1024 mol s−1 and Q(CN) = (9.5 ± 0.2) × 1024 mol s−1, respectively, in agreement with measurements reported by other authors on similar nights. We also obtained an upper limit for the C2 production rate of Q(C2) < (4.5 ± 0.1) × 1024 mol s−1. Dust modelling results indicate a moderate dust production rate of ∼50 kg s−1 at heliocentric distance rh = 2.6 au, with a differential power-law dust size distribution of index ∼–3.4, within the range reported for many comet comae. Our simulations show that the Galactic velocity of 2I/Borisov matches well that of known stars in the solar neighbourhood and also those of more distant regions of the Galactic disc.

scholarly journals Ultraviolet to Near Infrared Observations of BF Cyg

1988 ◽  
Vol 103 ◽  
pp. 301-302
Author(s):  
A. Cassatella ◽  
R. Gonzalez-Riestra ◽  
T. Fernandez-Castro ◽  
J. Fuensalida ◽  
A. Gimenez
Keyword(s):  
Canary Islands ◽  
Near Infrared ◽  
Single Channel ◽  
Photon Counting ◽  
Optical Observations ◽  
Counting System ◽  
Infrared Observations ◽  
Isaac Newton ◽  
Preliminary Results ◽  
La Palma

In this paper we provide preliminary results of multifrequency observations of BF Cyg carried out in July 1986. The ultraviolet spectra were obtained on July 26, 1986 using the IUE satellite. The optical observations were made at the Observatorio del Roque de los Muchachos (La Palma, Canary Islands) in July 1986 during the night 13/14 using the Isaac Newton 2.5m telescope with the Intermediate Dispersion Spectrograph (IDS, 500 mm camera) and the Image Photon Counting System (IPCS). The infrared observations were made during the night 13/14 of July, 1986, at the Observatorio del Teide (Tenerife, Canary Islands) using the Carlos Sanchez 1.5m telescope and an infrared single-channel photometer with an InSb detector.

Spectroscopic study of Ceres' collisional family candidate members: taxonomic classification and comparison to Ceres' surface.

2021 ◽  
Author(s):  
Fernando Tinaut-Ruano ◽  
Julia de Leon ◽  
Eri Tatsumi ◽  
Batiste Rousseau ◽  
Juan Luis Rizos
Keyword(s):  
Near Infrared ◽  
Asteroid Belt ◽  
Space Weathering ◽  
Spectral Slope ◽  
Dynamical Study ◽  
Royal Astronomical Society ◽  
La Palma ◽  
The Family ◽  
Visible Spectra ◽  
Main Asteroid Belt

<p>Despite the observed signs of large impacts on the surface of Ceres, there is no confirmed collisional family associated with this dwarf planet. Carruba et al. (2016) carried out a dynamical study in the ‘pristine region’ of the main asteroid belt and proposed a sample of 156 asteroids as candidates to be members of a Ceres’ collisional family. Our main objective in this work is to study the spectral link between Ceres and a total of 14 observed asteroids among the family candidate samples proposed by Carruba et al. (2016) to explore their potential membership to the collisional family.</p> <p>For this aim we obtained visible spectra of these 14 asteroids using the OSIRIS spectrograph at the 10.4m Gran Telescopio de Canarias (GTC), located at the El Roque de los Muchachos Observatory (La Palma, Spain), managed by the Instituto de Astrofísica de Canarias (IAC). We reduced the raw images and extracted the spectra with a semi-automatic Python-based pipeline. After that, we computed spectral slopes in two different wavelength ranges: one in the visible (490-800 nm) and one in the visible-near-infrared (800-920 nm) to compare the obtained values with those in Ceres’ surface already Ncomputed by Rousseau et al. (2020) using the spectrometer onboard the NASA Dawn spacecraft.</p> <p>We present the spectra and the taxonomy of 14 observed asteroids, their taxonomy, and calculated slopes. We concluded that only one asteroid could be compatible with an origin in a primitive collision at Ceres. We have also found a hydration band at 700 nm, also found in the surroundings of crater Occattor (Rizos et al. 2019). On the other hand, we have also found a relation between the spectral slope of the craters in Ceres’ surface and their age in both wavelength ranges. This behavior could be related to space weathering.</p> <p>Exploring the sample as a whole, the variability in member’s taxonomy and the differences in their spectral slopes makes us conclude that they cannot be considered as members of a collisional family of Ceres. However, the presence of a hydration band in one of the asteroids could be proof that such a family may have existed.</p> <p> </p> <p> </p> <p>Bibliography:</p> <p>Carruba, V., Nesvorný, D., Marchi, S., & Aljbaae, S. 2016, Monthly Notices of the Royal Astronomical Society, 458, 1117</p> <p>Rousseau, B., De Sanctis, M. C., Raponi, A., et al. 2020, A&A, 642, A74</p> <p>Rizos, J. L., de León, J., Licandro, J., et al. 2019, Icarus, 328, 69</p>

Construction of a near-infrared responsive upconversion nanoplatform against hypoxic tumors via NO-enhanced photodynamic therapy

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7875-7887 ◽  
Author(s):  
Ying Lan ◽  
Xiaohui Zhu ◽  
Ming Tang ◽  
Yihan Wu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Near Infrared ◽  
Upconversion Nanoparticles

A near-infrared (NIR) activated theranostic nanoplatform based on upconversion nanoparticles (UCNPs) is developed in order to overcome the hypoxia-associated resistance in photodynamic therapy by photo-release of NO upon NIR illumination.

A nitroreductase-activatable near-infrared theranostic photosensitizer for photodynamic therapy under mild hypoxia

2020 ◽  
Vol 56 (43) ◽  
pp. 5819-5822
Author(s):  
Jing Zheng ◽  
Yongzhuo Liu ◽  
Fengling Song ◽  
Long Jiao ◽  
Yingnan Wu ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Triplet State ◽  
Near Infrared ◽  
Mild Hypoxia

In this study, a near-infrared (NIR) theranostic photosensitizer was developed based on a heptamethine aminocyanine dye with a long-lived triplet state.

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