First multiband atmospheric extinction in Antarctica PAIX monitoring the South Polar Sky

Chadid, M.; Vernin, J.

doi:10.1093/mnras/stz249

Cited by 4 publications

(3 citation statements)

References 19 publications

(19 reference statements)

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“…The PAIX Pipeline Package -PPP-provides work flows for processing PAIX observed polar photometric data. Such software tool has been developed and maintained to provide measurements of both magnitude and extinction extractions and their precision towards Light Curves and Bouger's lines simultaneously (Chadid & Vernin (2019)). The PAIX Pipeline -PPP-is principally based on a set of four softwares, (1) raw UBVRI images are corrected from dark, bias, flat fields and then corrected for hot pixels.…”

Section: Paix Data Processing Pipeline -Ppp-mentioning

confidence: 99%

“…Up to now, the best applications in RR Lyrae stars study have relied dominantly on classical ground-based data sets (Alcock et al (2003) and Soszyński et al (2019)), improved progressively by use of space telescopes such as CoRoT (Auvergne et al (2009) and Chadid ( 2012)), Kepler (Gilliland et al (2010), Benkő et al (2014) and Molnár et al (2015) ) and TESS (Molnár et al (2021)), and accomplished by implementing a new way, Antarctica polar observations with PAIX long uninterrupted and continuous precision observations over 150 days from the ground, 1 polar night, and without the regular interruptions imposed by the earth rotation (Chadid & Vernin (2019) and Chadid et al (2014)).…”

Section: Introductionmentioning

confidence: 99%

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Detection of Gravity Modes in RR Lyrae Stars

Chadid

2022

Preprint

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We report the detection of gravity modes in RR Lyrae stars. Thanks to PAIX, the first Antarctica polar photometer. Unprecedented and uninterrupted U BV RI time-series photometric ground-based data are collected during 150 days from the highest plateau of Antarctica. PAIX light curve analyses reveal an even richer power spectrum with mixed modes in RR Lyrae stars. A nonlinear nature of several dominant peaks, showing lower and higher frequencies, occur around the dominant fundamental radial pressure mode. These lower frequencies and harmonics linearly interact with the dominant fundamental radial pressure mode and its second and third overtone pressure modes as well. Halfinteger frequencies are also detected, likewise side peak structures demonstrating that HH puppis is a bona-fide Blazhko star. Fourier correlations are used to derive underlying physical characteristics for HH puppis. The most striking finding is the direct detection of gravity waves. We interpret the excitation mechanism of gravity waves in RR Lyrae stars by the penetrative convection driving mechanism. We demonstrate that RR Lyrae stars pulsation is excited by several distinct mechanisms, and hence RR Lyrae stars are simultaneously g modes and p modes pulsators. Our discoveries make RR Lyrae stars very challenging stellar objects, and provide their potential to undergo at the same time g modes and p modes towards an advancement of theory of stellar evolution and a better understanding of the Universe.

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Section: Paix Data Processing Pipeline -Ppp-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of Gravity Modes in RR Lyrae Stars

Chadid

2022

Preprint

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“…11 (Buton et al 2013), at Cerro Paranal is 0.12(Patat et al 2011), at Dome C Antarctica is 0.13(Chadid & Vernin 2019), and at Gaomeigu China is 0.20(Hu 2011). Based on the moonlit sky brightness modelling,Yao et al (2013) derived 𝑘 = 0.23 for Xinglong Station China.…”

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confidence: 98%

Characterisation of Timau National Observatory using limited in-situ measurements

Priyatikanto,

Mumpuni,

Hidayat

et al. 2022

Preprint

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A new astronomical observatory in southeastern Indonesia is currently under construction. This Timau National Observatory will host a 3.8-metre telescope for optical and near-infrared observations. To support the operation and planning, the characterisation of the site needs to be appropriately performed. However, limited resources and access to the site hindered the deployment of instruments for comprehensive site testing. Fortunately, in-situ sky brightness data from the Sky Quality Meter (SQM) have been available for almost two years. Based on the data acquired in 470 nights, we obtain a background sky brightness of 𝜇 0 = 21.86 ± 0.38 magnitude/arcsec 2 . Additionally, we evaluate the moonlit sky brightness to estimate the atmospheric extinction coefficient (𝑘) and level of scattering on site. We find an alleviated value of 𝑘 = 0.48 ± 0.04, associated with a high atmospheric aerosol content. It is considered regular for an equatorial area situated at a low altitude (∼1300 masl). By analysing the fluctuation of the sky brightness and infrared images from Himawari-8 satellite, we estimate the available observing time (AOT) of at least 5.3 hours/night and the yearly average percentage of usable nights of 66%. The monthly average AOT from SQM and satellite data analysis correlate with 𝑅 = 0.82. In terms of the monthly percentage of usable nights, the correlation coefficient is 𝑅 = 0.78. During the wet season (November-April), the results from SQM and satellite data analysis deviate more significantly, mainly due to the limited capability of Himawari-8 in detecting fragmented low-altitude clouds. According to these results, we expect Timau to complement other observatories greatly.

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Characterization of Timau National Observatory using limited in situ measurements

Priyatikanto

Mumpuni

Hidayat

et al. 2022

Monthly Notices of the Royal Astronomical Society

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A new astronomical observatory in south-eastern Indonesia is currently under construction. This Timau National Observatory will host a 3.8-m telescope for optical and near-infrared observations. To support the operation and planning, the characterization of the site needs to be appropriately performed. However, limited resources and access to the site hindered the deployment of instruments for comprehensive site testing. Fortunately, in situ sky brightness data from the Sky Quality Meter (SQM) have been available for almost 2 yr. Based on the data acquired in 470 nights, we obtain a background sky brightness of μ0 = 21.86 ± 0.38 mag arcsec−2. Additionally, we evaluate the moonlit sky brightness to estimate the atmospheric extinction coefficient (k) and level of scattering on site. We find an elevated value of k = 0.48 ± 0.04, associated with a high atmospheric aerosol content. It is considered regular for an equatorial area situated at a low altitude (∼1300 masl). By analysing the fluctuation of the sky brightness and infrared images from Himawari-8 satellite, we estimate the available observing time (AOT) of at least 5.3 h/night and the yearly average percentage of usable nights of $66{{\ \rm per\ cent}}$. The monthly average AOT from SQM and satellite data analysis correlate with R = 0.82. In terms of the monthly percentage of usable nights, the correlation coefficient is R = 0.78. During the wet season (November–April), the results from SQM and satellite data analysis deviate more significantly, mainly due to the limited capability of Himawari-8 in detecting fragmented low-altitude clouds. According to these results, we expect Timau to complement other observatories greatly.

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First multiband atmospheric extinction in Antarctica PAIX monitoring the South Polar Sky

Cited by 4 publications

References 19 publications

Detection of Gravity Modes in RR Lyrae Stars

Detection of Gravity Modes in RR Lyrae Stars

Characterisation of Timau National Observatory using limited in-situ measurements

Characterization of Timau National Observatory using limited in situ measurements

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