Precipitable Water Vapour at the Canarian Observatories (Teide and Roque de los Muchachos) from routine GPS

Castro-Almazán, Julio A.; Muñoz–Tuñón, C.; García-Lorenzo, B.; Pérez-Jordán, Gabriel; Varela, A. M.; Romero, Ignacio

doi:10.1117/12.2232646

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…Strip will be deployed at the Teide Observatory in Tenerife, at an altitude of 2400 m above sea level, coordinates: 28°18 0 N, 16°30 35 W. The site provides excellent observing conditions and has been well-tested for astronomical observations for more than 30 years. The median precipitable water vapour is 3.5 mm, reaching values below 2 mm during 30% of the time [32]. The inversion layer lies below the observatory for approximately 80% of the time.…”

Section: Observation Sitementioning

confidence: 96%

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

Addamo

Ade

Baccigalupi

et al. 2021

J. Cosmol. Astropart. Phys.

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The measurement of the polarization of the Cosmic Microwave Background (CMB) radiation is one of the current frontiers in cosmology. In particular, the detection of the primordial divergence-free component of the polarization field, the B-mode, could reveal the presence of gravitational waves in the early Universe. The detection of such a component is at the moment the most promising technique to probe the inflationary theory describing the very early evolution of the Universe. We present the updated performance forecast of the Large Scale Polarization Explorer (LSPE), a program dedicated to the measurement of the CMB polarization. LSPE is composed of two instruments: LSPE-Strip, a radiometer-based telescope on the ground in Tenerife-Teide observatory, and LSPE-SWIPE (Short-Wavelength Instrument for the Polarization Explorer) a bolometer-based instrument designed to fly on a winter arctic stratospheric long-duration balloon. The program is among the few dedicated to observation of the Northern Hemisphere, while most of the international effort is focused into ground-based observation in the Southern Hemisphere. Measurements are currently scheduled in Winter 2022/23 for LSPE-SWIPE, with a flight duration up to 15 days, and in Summer 2022 with two years observations for LSPE-Strip. We describe the main features of the two instruments, identifying the most critical aspects of the design, in terms of impact on the performance forecast. We estimate the expected sensitivity of each instrument and propagate their combined observing power to the sensitivity to cosmological parameters, including the effect of scanning strategy, component separation, residual foregrounds and partial sky coverage. We also set requirements on the control of the most critical systematic effects and describe techniques to mitigate their impact. LSPE will reach a sensitivity in tensor-to-scalar ratio of σ r < 0.01, set an upper limit r < 0.015 at 95% confidence level, and improve constraints on other cosmological parameters.

show abstract

Section: Observation Sitementioning

confidence: 96%

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

Addamo

Ade

Baccigalupi

et al. 2021

J. Cosmol. Astropart. Phys.

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show abstract

“…The site provides excellent observing conditions and has been well-tested for astronomical observations for more than 30 years. The median precipitable water vapour is 3.5 mm, reaching values below 2 mm during 30% of the time [10]. The inversion layer lies below the observatory for approximately 80% of the time.…”

Section: Observation Sitementioning

confidence: 96%

“…This is described by the parameter σ θ HWP . We have explored σ θ HWP = [0, 3,10] . Our measurement precision, with Kalman filter approach, is of order σ θ HWP ≤ 0.1 ;…”

Section: Hwp Synchronous Systematic Effects and Mitigationmentioning

confidence: 99%

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

Addamo,

Ade,

Baccigalupi

et al. 2020

Preprint

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The measurement of the polarization of the Cosmic Microwave Background (CMB) radiation is one of the current frontiers in cosmology. In particular, the detection of the primordial divergence-free component of the polarization field, the B-mode component, could reveal the presence of gravitational waves in the early Universe. The detection of such component is at the moment the most promising technique to probe the inflationary theory describing the very early evolution of the Universe. We present the updated performance forecast of the Large Scale Polarization Explorer (LSPE), a program dedicated to the measurement of the CMB polarization. LSPE is composed of two instruments: LSPE-Strip, a radiometer-based telescope on the ground in Tenerife, and LSPE-SWIPE (Short-Wavelength Instrument for the Polarization Explorer) a bolometer-based instrument designed to fly on a winter arctic stratospheric long-duration balloon. The program is among the few dedicated to observation of the Northern Hemisphere, while most of the international effort is focused into ground-based observation in the Southern Hemisphere. Measurements are currently scheduled in Winter 2021/22 for LSPE-SWIPE, with a flight duration up to 15 days, and in Summer 2021 with two years observations for LSPE-Strip. We describe the main features of the two instruments, identifying the most critical aspects of the design, in terms of impact into performance forecast. We estimate the expected sensitivity of each instrument and propagate their combined observing power to the sensitivity to cosmological parameters, including the effect of scanning strategy, component separation, residual foregrounds and partial sky coverage. We also set requirements on the control of the most critical systematic effects and describe techniques to mitigate their impact. LSPE can reach a sensitivity in tensor-to-scalar ratio of σ r < 0.01, and improve constrains on other cosmological parameters.

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“…This telescope has a parabolic primary mirror with an aperture of 1.5 m, providing angular resolutions of ≈ 20 arcmin in Q-band and ≈ 10 arcmin in W-band. The telescope will be located at Teide Observatory, which is a word-class astronomical observatory that benefits from a highly stable atmosphere with a median precipitable water vapour of 3.5 mm [20]. Its suitability for these kinds of observations has been demonstrated by many other CMB experiments that have previously observed from this site, such as the Very Small Array [6], and that are currently operating, such as QUĲOTE [23] and GroundBIRD [24].…”

Section: The Strip Instrumentmentioning

confidence: 99%

LSPE-Strip on-sky calibration strategy using bright celestial sources

Génova-Santos,

Bersanelli,

Franceschet

et al. 2024

J. Inst.

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In this paper we describe the global on-sky calibration strategy of the LSPE-Strip instrument. Strip is a microwave telescope operating in the Q- and W-bands (central frequencies of 43 and 95 GHz respectively) from the Observatorio del Teide in Tenerife, with the goal to observe and characterise the polarised Galactic foreground emission, and complement the observations of the polarisation of the cosmic microwave background to be performed by the LSPE-SWIPE instrument and other similar experiments operating at higher frequencies to target the detection of the B-mode signal from the inflationary epoch of the Universe. Starting from basic assumptions on some of the instrument parameters (NET, 1/f noise knee frequency, beam properties, observing efficiency) we perform realistic simulations to study the level of accuracy that can be achieved through observations of bright celestial calibrators in the Strip footprint (sky fraction of 30%) on the determination and characterisation of the main instrument parameters: global and relative gain factors (in intensity and in polarisation), polarisation direction, polarisation efficiency, leakage from intensity to polarisation, beams, window functions and pointing model.

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Precipitable Water Vapour at the Canarian Observatories (Teide and Roque de los Muchachos) from routine GPS

Cited by 12 publications

References 11 publications

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

LSPE-Strip on-sky calibration strategy using bright celestial sources

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