A proto-helium white dwarf stripped by a substellar companion via common-envelope ejection - Uncovering the true nature of a candidate hypervelocity B-type star

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Volume 650 (June 2021)

A&A, 650 (2021) A102

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Table 1.

Observations.

Date	Exp.	S/N	Spectrograph	v_rad^(a)
(d)	(s)			(km s⁻¹)
5706.8079	6306	36	BOSS (2000)	−320.6 ± 4.0 ^(b)
7579.8213	1800	43	ESI (5200)	−383.8 ± 3.3
7579.8427	1800	12	ESI (5200)	−370.5 ± 4.4
7579.8654	1800	47	ESI (8000)	−343.3 ± 3.2
7959.3798	900	35	blue arm ISIS (2.0 Å)	−315.2 ± 11.6 ^(c)
7959.3908	900	38	blue arm ISIS (2.0 Å)	−308.0 ± 11.5 ^(c)
7961.4907	1800	34	blue arm ISIS (1.2 Å)	−378.6 ± 11.0 ^(c)
7961.5132	1800	27	blue arm ISIS (1.2 Å)	−323.5 ± 11.2 ^(c)
8255.0640	1500	62	ESI (8000)	−343.5 ± 6.8 ^(d)
8255.0821	1500	60	ESI (8000)	−369.0 ± 5.3 ^(d)
8564.7278	1800	19	X-shooter (10 000)	−323.4 ± 4.0
8565.7407	1800	28	X-shooter (10 000)	−337.9 ± 3.2
8565.7668	1800	35	X-shooter (10 000)	−375.8 ± 3.2
8565.8164	1800	30	X-shooter (10 000)	−359.3 ± 4.4
8565.8427	1800	36	X-shooter (10 000)	−317.4 ± 3.4
8565.8693	1800	36	X-shooter (10 000)	−318.5 ± 4.0

Notes. The first column is the heliocentric Julian date (HJD) at the middle of the observation minus 2 450 000, the second column is the exposure time, the third is the average signal-to-noise ratio (S/N), the fourth is the spectrograph with its approximate resolving power λ/Δλ or Δλ in parentheses, and the fifth is the measured heliocentric radial velocity. The uncertainties of the last column’s values are the quadratic sum of 1σ statistical uncertainties and a generic systematic uncertainty of 3 km s⁻¹.

^(a)

Not corrected for gravitational redshift.

^(b)

Not used for the analysis of the radial-velocity curve because the exposure time is roughly half the orbital period.

^(c)

A generic uncertainty of 10 km s⁻¹ was added in quadrature to account for possible wavelength shifts caused by instrument flexure.

^(d)

Uncertainties were increased to account for a small offset in the wavelength calibration as indicated by the position of the telluric features.

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