A near-infrared interferometric survey of debris-disc stars - V. PIONIER search for variability

S. Ertel; D. Defrère; O. Absil; J.-B. Le Bouquin; J.-C. Augereau; J.-P. Berger; N. Blind; A. Bonsor; A.-M. Lagrange; J. Lebreton; L. Marion; J. Milli; J. Olofsson

doi:10.1051/0004-6361/201527721

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Volume 595 (November 2016)

A&A, 595 (2016) A44

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Table 1

Observing log, excesses, and variability.

HD	Night	f_CSE [%]	Δ_CSE

2262	2012-10-15¹	0.67 ± 0.17 ± 0.06	0.91
	2013-08-10	0.40 ± 0.15 ± 0.06	–0.45
	2014-10-11	0.42 ± 0.15 ± 0.06	–0.34

7788	2012-07-23¹	1.43 ± 0.16 ± 0.05	3.0
	2013-08-10	0.07 ± 0.15 ± 0.05	–4.12
	2014-10-11	1.16 ± 0.17 ± 0.05	1.55

20794	2012-12-16¹	1.64 ± 0.26 ± 0.26	1.59
	2013-08-10	0.75 ± 0.20 ± 0.24	–0.65
	2014-10-12	0.77 ± 0.24 ± 0.18	–0.60

28355	2012-12-15¹	0.88 ± 0.08 ± 0.05	1.0
	2014-10-11	0.52 ± 0.12 ± 0.05	–1.63

39060	2010-12-04²	1.48 ± 0.20 ± 0.05	0.45
(β Pic)	2010-12-20²	1.48 ± 0.20 ± 0.05	0.45
	2011-11-02	1.32 ± 0.15 ± 0.05	–0.32
	2012-10-16¹	0.88 ± 0.22 ± 0.05	–2.05
	2013-08-10	1.81 ± 0.38 ± 0.05	1.11
	2014-10-11	1.47 ± 0.11 ± 0.05	0.64

172555	2012-07-24¹	0.55 ± 0.25 ± 0.05	–0.59
	2013-04-18	0.93 ± 0.59 ± 0.05	0.34
	2014-10-12	0.80 ± 0.18 ± 0.05	0.32

210302	2012-07-24¹	0.83 ± 0.24 ± 0.05	2.77
	2013-08-10	−0.16 ± 0.13 ± 0.05	–1.48
	2014-10-11	0.11 ± 0.14 ± 0.05	0.11

Notes. f_CSE is the flux ratio between the circumstellar emission and the star. Δ_CSE is the significance of the deviation of this value from the error weighted mean of all considered measurements of this target (Eq. (1)). Uncertainties on the flux ratios are separated in statistical errors (first value) and systematic errors (see Sect. 4 for details). The two values should be added in quadrature to obtain the total uncertainties used in this work.

⁽¹⁾

Survey detection (Ertel et al. 2014).

⁽²⁾

Data obtained on 2010-12-04 and on 2010-12-20 are combined to one measurement in order to improve the accuracy since no variability is seen between the two observations.

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