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

doi:10.1051/0004-6361/201732121

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

Physics and Astronomy

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19 Scopus citations

Abstract

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 language	English (US)
Article number	L6
Journal	Astronomy and Astrophysics
Volume	608
DOIs	https://doi.org/10.1051/0004-6361/201732121
State	Published - Dec 1 2017

Funding

Acknowledgements. The field activities at Dome C benefit from the support of the French and Italian polar agencies IPEV and PNRA in the framework of the Concordia station programme. Part of the project has been supported by the Programme National de Planétologie, the Lagrange Laboratory of the Ob-servatoire de la Côte d’Azur, the National Research Agency (ANR-14-CE33-0018), and through the UCAJEDI “Investments in the Future” project managed by the ANR (ANR-15-IDEX-01). K.Z. acknowledges support by the Austrian Fonds zur Förderung der wissenschaftlichen Forschung (FWF, project V431-NBL), the Austrian Space Application Programme (ASAP) of the Austrian Research Promotion Agency (FFG), and the Tiroler Wissenschaftsfonds (GZ: UNI-0404/1985; PI: K. Zwintz). P.K. and J.J.W. acknowledge support from NASA NNX15AC89G and NNX15AD95G/NEXSS, NSF AST-1518332 and HST-GO-14621. This work benefited from NASA’s Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASA’s Science Mission Directorate.

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Mékarnia, D., Chapellier, E., Guillot, T., Abe, L., Agabi, A., De Pra, Y., Schmider, F. X., Zwintz, K., Stevenson, K. B., Wang, J. J., Lagrange, A. M., Bigot, L., Crouzet, N., Fanteï-Caujolle, Y., Christille, J. M., & Kalas, P. (2017). The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica. Astronomy and Astrophysics, 608, Article L6. https://doi.org/10.1051/0004-6361/201732121

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title = "The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica",

abstract = "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.",

keywords = "Methods: data analysis, Stars: individual: βPictoris, Stars: oscillations, Stars: variables: δScuti, Techniques: photometric",

author = "D. M{\'e}karnia and E. Chapellier and T. Guillot and L. Abe and A. Agabi and {De Pra}, Y. and Schmider, {F. X.} and K. Zwintz and Stevenson, {K. B.} and Wang, {J. J.} and Lagrange, {A. M.} and L. Bigot and N. Crouzet and Y. Fante{\"i}-Caujolle and Christille, {J. M.} and P. Kalas",

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year = "2017",

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doi = "10.1051/0004-6361/201732121",

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Mékarnia, D, Chapellier, E, Guillot, T, Abe, L, Agabi, A, De Pra, Y, Schmider, FX, Zwintz, K, Stevenson, KB, Wang, JJ, Lagrange, AM, Bigot, L, Crouzet, N, Fanteï-Caujolle, Y, Christille, JM & Kalas, P 2017, 'The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica', Astronomy and Astrophysics, vol. 608, L6. https://doi.org/10.1051/0004-6361/201732121

TY - JOUR

T1 - The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica

AU - Mékarnia, D.

AU - Chapellier, E.

AU - Guillot, T.

AU - Abe, L.

AU - Agabi, A.

AU - De Pra, Y.

AU - Schmider, F. X.

AU - Zwintz, K.

AU - Stevenson, K. B.

AU - Wang, J. J.

AU - Lagrange, A. M.

AU - Bigot, L.

AU - Crouzet, N.

AU - Fanteï-Caujolle, Y.

AU - Christille, J. M.

AU - Kalas, P.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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.

AB - 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.

KW - Methods: data analysis

KW - Stars: individual: βPictoris

KW - Stars: oscillations

KW - Stars: variables: δScuti

KW - Techniques: photometric

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DO - 10.1051/0004-6361/201732121

M3 - Article

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SN - 0004-6361

VL - 608

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L6

ER -

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

Abstract

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