The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica

D. Mékarnia, E. Chapellier, T. Guillot, L. Abe, A. Agabi, Y. De Pra, F. X. Schmider, K. Zwintz, K. B. Stevenson, J. J. Wang, A. M. Lagrange, L. Bigot, N. Crouzet, Y. Fanteï-Caujolle, J. M. Christille, P. Kalas

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Aims. The Antarctica Search for Transiting Extrasolar Planets (ASTEP), an automatized 400 mm telescope located at Concordia station in Antarctica, monitored β Pictoris continuously to detect any variability linked to the transit of the Hill sphere of its planet β Pictoris b. The long observation sequence, from March to September 2017, combined with the quality and high level duty cycle of our data, enables us to detect and analyse the δ Scuti pulsations of the star. Methods. Time series photometric data were obtained using aperture photometry by telescope defocussing. The 66 418 data points were analysed using the software package Period04. We only selected frequencies with amplitudes that exceed four times the local noise level in the amplitude spectrum. Results. We detect 31 δ Scuti pulsation frequencies, 28 of which are new detections. All the frequencies detected are in the interval 34.76-75.68 d-1. We also find that β Pictoris exhibits at least one pulsation mode that varies in amplitude over our monitoring duration of seven months.

Original languageEnglish (US)
Article numberL6
JournalAstronomy and Astrophysics
StatePublished - Dec 1 2017


  • Methods: data analysis
  • Stars: individual: βPictoris
  • Stars: oscillations
  • Stars: variables: δScuti
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica'. Together they form a unique fingerprint.

Cite this