1. Single-photon gig in Betelgeuse's occultation
- Author
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Prada, F., Gomez-Merchan, R., Pérez, E., Betancort-Rijo, J. E., Leñero-Bardallo, J. A., Rodríguez-Vázquez, Á., Glez-de-Rivera, G., Díaz-López, S., and Cantalapiedra, J. de Elias
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We present results from the occultation of Betelgeuse by asteroid (319) Leona on December 12, 2023, observed using a 64x64 pixel Single-Photon Avalanche Diode (SPAD) array mounted on a 10-inch telescope at the AstroCamp Observatory in Nerpio, Southeast of Spain, just a few kilometers from the center of the occultation shadow path. This study highlights remarkable advancements in applying SPAD technology in astronomy. The SPAD array's asynchronous readout capacity and photon-counting timestamp mode enabled a temporal resolution of 1 microsecond in our light curve observations of Betelgeuse. Our data analysis addressed challenges inherent to SPAD arrays, such as optical cross-talk and afterpulses, which typically cause the photon statistics to deviate from a Poisson distribution. By adopting a generalized negative binomial distribution for photon statistics, we accurately describe the observational data. This method yielded an optical cross-talk estimation of 1.07% in our SPAD array and confirmed a negligible impact of spurious detected events due to afterpulses. The meticulous statistical examination of photon data underscores our SPAD-array's exceptional performance in conducting precise astronomical observations. The observations revealed a major decrease in Betelgeuse's intensity by 77.78% at the occultation's peak, allowing us to measure Betelgeuse's angular diameter at 57.26 mas in the SDSS g-band. This measurement, employing a simplified occultation model and considering the known properties of Leona, demonstrates the potential of SPAD technology for astronomy and sets a new standard for observing ultra-rapid transient celestial events, providing a valuable public dataset for the astronomical community., Comment: 7 pages, 4 figures
- Published
- 2024