How many suns are in the sky? A SPHERE multiplicity survey of exoplanet host stars - I. Four new close stellar companions including a white dwarf

Free Access

Table 2

Observation parameters for all four systems.

System	RA (hh mm ss.s)	Dec (dd mm ss.s)	Observation date	DIT (s)	Total int. time (s)	Seeing (″)	Coherence time (ms)
HD 1666	00 20 52.3	−19 55 52.4	25/10/2016	12	192	1.08	5.3
			05/09/2017	12	192	1.03	1.5
HD 109271	12 33 35.6	−11 37 18.7	29/01/2018	12	192	0.36	8.6
			28/01/2019	12	192	1.11	4.5
HIP 68468	14 01 03.6	−32 45 25.0	13/03/2018	16	256	0.90	7.0
			20/02/2019	12	192	1.41	2.6
			26/12/2019	16	192	0.68	7.0
HIP 107773	21 50 00.1	−64 42 45.1	09/10/2016	6	360	0.51	10.4
			04/09/2017	3	216	0.49	3.2

Notes. We give the date of observation, the integration time for a single frame (DIT), as well as the total integration time and average weather conditions (seeing and coherence time of the atmosphere).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.