PRATUSH experiment concept and design overview

Abstract

PRATUSH -- Probing ReionizATion of the Universe using Signal from Hydrogen -- is a proposed cosmology experiment to detect the global red-shifted 21-cm signal from the Cosmic Dawn and Epoch of Reionization (CD/EoR). PRATUSH orbiting the Moon will seek to precisely measure the low-frequency radio sky-spectrum over 40 to 200 MHz. The scientific observations would be made in the radio-quiet region when in the farside of the Moon, and the data would be transmitted back to Earth when in the near-side. PRATUSH was proposed to the Indian Space Research Organization (ISRO) during a call for proposals in the announcement of opportunity for science payloads in 2018. PRATUSH is in the pre-project studies phase. Here we present a mission concept and baseline design of the proposed payload optimized to operate over the Cosmic Dawn signal band of 55 - 110 MHz. Starting with a description of the fundamental design principles followed, we discuss the PRATUSH baseline design and sensitivity. We further enumerate the challenges that are common to most PRATUSH like experiments, which have been proposed to seek a detection of the CD/EoR signal in orbit in the lunar farside. Due to the highly sensitive nature of the measurement, PRATUSH is designed to operate as a solo experiment with a dedicated spacecraft. Our simulations, assuming a mission lifetime of two years, estimate that PRATUSH would have the sensitivity required to detect the CD signal predicted by the standard models with varying degrees of confidence.A concept model of PRATUSH is under development, which is expected to lead to the engineering model followed by flight model subject to mission approval.

42 pages, 16 figures, published in Experimental Astronomy

References in corpus (49)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• An absorption profile centred at 78 megahertz in the sky-averaged spectrum
• 21-cm cosmology
• Observational constraints on Cosmic Reionization
• Possible interaction between baryons and dark-matter particles revealed by the first stars
• PolyChord: next-generation nested sampling
• A model of diffuse Galactic Radio Emission from 10 MHz to 100 GHz
• Insights on Dark Matter from Hydrogen during Cosmic Dawn
• Enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn
• Concerns about Modelling of the EDGES Data
• Modeling the Radio Background from the First Black Holes at Cosmic Dawn: Implications for the 21 cm Absorption Amplitude
• The observable signature of late heating of the Universe during cosmic reionization
• Evolution of the 21 cm signal throughout cosmic history
• Charting the Parameter Space of the Global 21-cm Signal
• Signature of Excess Radio Background in the 21-cm Global Signal and Power Spectrum
• Constraining the unexplored period between reionization and the dark ages with observations of the global 21 cm signal
• Constraining Baryon--Dark Matter Scattering with the Cosmic Dawn 21-cm Signal
• Testing for calibration systematics in the EDGES low-band data using Bayesian model selection
• A Ground Plane Artifact that Induces an Absorption Profile in Averaged Spectra from Global 21-cm Measurements - with Possible Application to EDGES
• The redshifted 21-cm signal in the EDGES low-band spectrum
• Spectral Index of the Diffuse Radio Background Measured From 100 to 200 MHz
• The Epoch of Reionization
• SARAS 2 constraints on global 21-cm signals from the Epoch of Reionization
• SARAS 2: A Spectral Radiometer for probing Cosmic Dawn and the Epoch of Reionization through detection of the global 21 cm signal
• The subtlety of Ly-a photons: changing the expected range of the 21-cm signal
• Chromatic effects in the 21 cm global signal from the cosmic dawn
• Results from EDGES High-Band: III. New Constraints on Parameters of the Early Universe
• On the detection of spectral ripples from the Recombination Epoch
• A Space-Based Observational Strategy for Characterizing the First Stars and Galaxies Using the Redshifted 21-cm Global Spectrum
• SARAS measurement of the Radio Background at long wavelengths
• SARAS 3 CD/EoR Radiometer: Design and Performance of the Receiver
• GLOBALEMU: A novel and robust approach for emulating the sky-averaged 21-cm signal from the cosmic dawn and epoch of reionisation
• Quantifying Ionospheric Effects on Global 21-cm Observations
• On the detection and tracking of space debris using the Murchison Widefield Array. I. Simulations and test observations demonstrate feasibility
• Formulating and critically examining the assumptions of global 21-cm signal analyses: How to avoid the false troughs that can appear in single spectrum fits
• Interpreting the Global 21-cm Signal from High Redshifts. I. Model Independent Constraints
• GMOSS: All-sky model of spectral radio brightness based on physical components and associated radiative processes
• Modeling the Radio Foreground for detection of CMB spectral distortions from Cosmic Dawn and Epoch of Reionization
• Assessment of the Projection-induced Polarimetry Technique for Constraining the Foreground Spectrum in Global 21 cm Cosmology
• Antenna beam characterisation for the global 21cm experiment LEDA and its impact on signal model parameter reconstruction
• Use of Time Dependent Data in Bayesian Global 21cm Foreground and Signal Modelling
• Characterizing the Radio Quiet Region Behind the Lunar Farside for Low Radio Frequency Experiments
• Lost Horizon: Quantifying the Effect of Local Topography on Global 21-cm Cosmology Data Analysis
• Absolute Calibration of Diffuse Radio Surveys at 45 and 150 MHz
• The impact of the ionosphere on ground-based detection of the global Epoch of Reionisation signal
• Studying cosmic reionization with observations of the global 21-cm signal
• SARAS CD/EoR Radiometer: Design and performance of the Digital Correlation Spectrometer
• One-Port Direct/Reverse Method for Characterizing VNA Calibration Standards
• Measurements of the global 21-cm signal from the Cosmic Dawn

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• Analyzing the 21cm forest with Wavelet Scattering Transform: Insight into non-Gaussian features of the 21cm forest
• Analyzing the 21-cm signal brightness temperature in the Universe with inhomogeneities
• Global 21 cm signal: a promising probe of primordial features
• Synthesis imaging with a lunar orbit array: I. global sky map and its systematics
• ECHO21: a tool for modelling global 21-cm signal from dark ages to reionization
• The impact of lunar topography on the 21-cm power spectrum for grid-based arrays : Insights for the Dark-ages EXplorer (DEX)
• Recovering 21cm Monopole Signals Without Smoothness
• An SBC-based controller and processor for the laboratory model of PRATUSH Digital Receiver
• Nonlinear reconstruction of 21cm global signal from 21cm power spectrum with artificial neural networks
• On the accuracy of posterior recovery with neural network emulators